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e03fcf4627
git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@3936 6c8d7289-2bf4-0310-a012-ef5d649a1542
590 lines
27 KiB
Java
590 lines
27 KiB
Java
//httpTemplate.java
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//-------------------------------------
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//(C) by Michael Peter Christen; mc@anomic.de
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//first published on http://www.anomic.de
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//Frankfurt, Germany, 2004
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//last major change: 16.01.2005
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//$LastChangedDate$
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//$LastChangedRevision$
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//$LastChangedBy$
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//extended for multi- and alternatives-templates by Alexander Schier
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//This program is free software; you can redistribute it and/or modify
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//it under the terms of the GNU General Public License as published by
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//the Free Software Foundation; either version 2 of the License, or
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//(at your option) any later version.
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//This program is distributed in the hope that it will be useful,
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//but WITHOUT ANY WARRANTY; without even the implied warranty of
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//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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//GNU General Public License for more details.
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//You should have received a copy of the GNU General Public License
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//along with this program; if not, write to the Free Software
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//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//Using this software in any meaning (reading, learning, copying, compiling,
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//running) means that you agree that the Author(s) is (are) not responsible
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//for cost, loss of data or any harm that may be caused directly or indirectly
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//by usage of this softare or this documentation. The usage of this software
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//is on your own risk. The installation and usage (starting/running) of this
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//software may allow other people or application to access your computer and
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//any attached devices and is highly dependent on the configuration of the
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//software which must be done by the user of the software; the author(s) is
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//(are) also not responsible for proper configuration and usage of the
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//software, even if provoked by documentation provided together with
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//the software.
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//Any changes to this file according to the GPL as documented in the file
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//gpl.txt aside this file in the shipment you received can be done to the
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//lines that follows this copyright notice here, but changes must not be
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//done inside the copyright notice above. A re-distribution must contain
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//the intact and unchanged copyright notice.
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//Contributions and changes to the program code must be marked as such.
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package de.anomic.http;
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import java.io.BufferedReader;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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import java.io.OutputStream;
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import java.io.PushbackInputStream;
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import java.io.UnsupportedEncodingException;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.Hashtable;
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import java.util.List;
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import de.anomic.server.serverByteBuffer;
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import de.anomic.server.serverFileUtils;
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import de.anomic.server.logging.serverLog;
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/**
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* A template engine, which substitutes patterns in strings<br>
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*
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* The template engine supports four types of templates:<br>
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* <ol>
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* <li>Normal templates: the template will be replaced by a string.</li>
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* <li>Multi templates: the template will be used more than one time.<br>
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* i.e. for lists</li>
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* <li>3. Alternatives: the program chooses one of multiple alternatives.</li>
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* <li>Includes: another file with templates will be included.</li>
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* </ol>
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*
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* All these templates can be used recursivly.<p>
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* <b>HTML-Example</b><br>
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* <pre>
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* <html><head></head><body>
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* #{times}#
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* Good #(daytime)#morning::evening#(/daytime)#, #[name]#!(#[num]#. Greeting)<br>
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* #{/times}#
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* </body></html>
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* </pre>
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* <p>
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* The corresponding Hashtable to use this Template:<br>
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* <b>Java Example</b><br>
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* <pre>
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* Hashtable pattern;
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* pattern.put("times", 10); //10 greetings
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* for(int i=0;i<=9;i++){
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* pattern.put("times_"+i+"_daytime", 1); //index: 1, second Entry, evening
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* pattern.put("times_"+i+"_name", "John Connor");
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* pattern.put("times_"+i+"_num", (i+1));
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* }
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* </pre>
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* <p>
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* <b>Recursion</b><br>
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* If you use recursive templates, the templates will be used from
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* the external to the internal templates.
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* In our Example, the Template in #{times}##{/times}# will be repeated ten times.<br>
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* Then the inner Templates will be applied.
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* <p>
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* The inner templates have a prefix, so they may have the same name as a template on another level,
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* or templates which are in another recursive template.<br>
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* <b>The Prefixes:</b>
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* <ul>
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* <li>Multi templates: multitemplatename_index_</li>
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* <li>Alterantives: alternativename_</li>
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* </ul>
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* So the Names in the Hashtable are:
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* <ul>
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* <li>Multi templates: multitemplatename_index_templatename</li>
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* <li>Alterantives: alternativename_templatename</li>
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* </ul>
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* <i>#(alternative)#::#{repeat}##[test]##{/repeat}##(/alternative)#</i><br>
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* would be adressed as "alternative_repeat_"+number+"_test"
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*/
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public final class httpTemplate {
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public static final byte hash = (byte)'#';
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private static final byte[] hasha = {hash};
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private static final byte dp = (byte)':';
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public static final byte[] dpdpa = {dp, dp};
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private static final byte lbr = (byte)'[';
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private static final byte rbr = (byte)']';
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private static final byte[] pOpen = {hash, lbr};
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private static final byte[] pClose = {rbr, hash};
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private static final byte lcbr = (byte)'{';
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private static final byte rcbr = (byte)'}';
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private static final byte[] mOpen = {hash, lcbr};
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private static final byte[] mClose = {rcbr, hash};
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private static final byte lrbr = (byte)'(';
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private static final byte rrbr = (byte)')';
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private static final byte[] aOpen = {hash, lrbr};
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private static final byte[] aClose = {rrbr, hash};
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private static final byte ps = (byte)'%';
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private static final byte[] iOpen = {hash, ps};
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private static final byte[] iClose = {ps, hash};
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public static final byte[] slash = {(byte)'/'};
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public static final Object[] meta_quotation = new Object[] {
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new Object[] {pOpen, pClose},
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new Object[] {mOpen, mClose},
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new Object[] {aOpen, aClose},
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new Object[] {iOpen, iClose}
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};
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public static serverByteBuffer[] splitQuotations(serverByteBuffer text) {
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List l = splitQuotation(text, 0);
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serverByteBuffer[] sbbs = new serverByteBuffer[l.size()];
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for (int i = 0; i < l.size(); i++) sbbs[i] = (serverByteBuffer) l.get(i);
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return sbbs;
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}
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public static List splitQuotation(serverByteBuffer text, int qoff) {
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ArrayList l = new ArrayList();
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if (qoff >= meta_quotation.length) {
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if (text.length() > 0) l.add(text);
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return l;
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}
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int p = -1, q;
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byte[] left = (byte[]) ((Object[]) meta_quotation[qoff])[0];
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byte[] right = (byte[]) ((Object[]) meta_quotation[qoff])[1];
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qoff++;
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while ((text.length() > 0) && ((p = text.indexOf(left)) >= 0)) {
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q = text.indexOf(right, p + 1);
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if (q >= 0) {
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// found a pattern
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l.addAll(splitQuotation(new serverByteBuffer(text.getBytes(0, p)), qoff));
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l.add(new serverByteBuffer(text.getBytes(p, q + right.length - p)));
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text = new serverByteBuffer(text.getBytes(q + right.length));
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} else {
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// found only pattern start, no closing parantesis (a syntax error that is silently accepted here)
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l.addAll(splitQuotation(new serverByteBuffer(text.getBytes(0, p)), qoff));
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l.addAll(splitQuotation(new serverByteBuffer(text.getBytes(p)), qoff));
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text.clear();
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}
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}
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// find double-points
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while ((text.length() > 0) && ((p = text.indexOf(dpdpa)) >= 0)) {
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l.addAll(splitQuotation(new serverByteBuffer(text.getBytes(0, p)), qoff));
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l.add(new serverByteBuffer(dpdpa));
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l.addAll(splitQuotation(new serverByteBuffer(text.getBytes(p + 2)), qoff));
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text.clear();
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}
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// add remaining
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if (text.length() > 0) l.addAll(splitQuotation(text, qoff));
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return l;
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}
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/**
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* transfer until a specified pattern is found; everything but the pattern is transfered so far
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* the function returns true, if the pattern is found
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*/
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private static boolean transferUntil(PushbackInputStream i, OutputStream o, byte[] pattern) throws IOException {
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int b, bb;
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boolean equal;
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while ((b = i.read()) > 0) {
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if ((b & 0xFF) == pattern[0]) {
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// read the whole pattern
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equal = true;
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for (int n = 1; n < pattern.length; n++) {
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if (((bb = i.read()) & 0xFF) != pattern[n]) {
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// push back all
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i.unread(bb);
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equal = false;
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for (int nn = n - 1; nn > 0; nn--) i.unread(pattern[nn]);
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break;
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}
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}
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if (equal) return true;
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}
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o.write(b);
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}
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return false;
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}
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public static void writeTemplate(InputStream in, OutputStream out, Hashtable pattern, byte[] dflt) throws IOException {
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writeTemplate(in, out, pattern, dflt, new byte[0]);
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}
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/**
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* Reads a input stream, and writes the data with replaced templates on a output stream
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*/
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public static byte[] writeTemplate(InputStream in, OutputStream out, Hashtable pattern, byte[] dflt, byte[] prefix) throws IOException {
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PushbackInputStream pis = new PushbackInputStream(in, 100);
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ByteArrayOutputStream keyStream;
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byte[] key;
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byte[] multi_key;
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byte[] replacement;
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int bb;
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serverByteBuffer structure=new serverByteBuffer();
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while (transferUntil(pis, out, hasha)) {
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bb = pis.read();
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keyStream = new ByteArrayOutputStream();
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if( (bb & 0xFF) == lcbr ){ //multi
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if( transferUntil(pis, keyStream, mClose) ){ //close tag
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//multi_key = "_" + keyStream.toString(); //for _Key
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bb = pis.read();
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if( (bb & 0xFF) != 10){ //kill newline
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pis.unread(bb);
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}
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multi_key = keyStream.toByteArray(); //IMPORTANT: no prefix here
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keyStream = new ByteArrayOutputStream(); //reset stream
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/* DEBUG - print key + value
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try{
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System.out.println("Key: "+prefix+multi_key+ "; Value: "+pattern.get(prefix+multi_key));
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}catch(NullPointerException e){
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System.out.println("Key: "+prefix+multi_key);
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}
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*/
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//this needs multi_key without prefix
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if( transferUntil(pis, keyStream, appendBytes(mOpen,slash,multi_key,mClose))){
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bb = pis.read();
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if((bb & 0xFF) != 10){ //kill newline
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pis.unread(bb);
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}
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byte[] text=keyStream.toByteArray(); //text between #{key}# an #{/key}#
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int num=0;
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String patternKey = getPatternKey(prefix, multi_key);
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if(pattern.containsKey(patternKey) && pattern.get(patternKey) != null){
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try{
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num=Integer.parseInt((String)pattern.get(patternKey)); // Key contains the iteration number as string
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}catch(NumberFormatException e){
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num=0;
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}
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//System.out.println(multi_key + ": " + num); //DEBUG
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}else{
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//0 interations - no display
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//System.out.println("_"+new String(multi_key)+" is null or does not exist"); //DEBUG
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}
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//Enumeration enx = pattern.keys(); while (enx.hasMoreElements()) System.out.println("KEY=" + enx.nextElement()); // DEBUG
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structure.append("<".getBytes("UTF-8"))
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.append(multi_key)
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.append(" type=\"multi\" num=\"".getBytes("UTF-8"))
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.append(Integer.toString(num).getBytes("UTF-8"))
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.append("\">\n".getBytes("UTF-8"));
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for(int i=0;i < num;i++ ){
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PushbackInputStream pis2 = new PushbackInputStream(new ByteArrayInputStream(text));
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//System.out.println("recursing with text(prefix="+ multi_key + "_" + i + "_" +"):"); //DEBUG
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//System.out.println(text);
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structure.append(writeTemplate(pis2, out, pattern, dflt, newPrefix(prefix,multi_key,i)));
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}//for
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structure.append("</".getBytes("UTF-8")).append(multi_key).append(">\n".getBytes("UTF-8"));
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}else{//transferUntil
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serverLog.logSevere("TEMPLATE", "No Close Key found for #{"+new String(multi_key)+"}#"); //prefix here?
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}
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}
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}else if( (bb & 0xFF) == lrbr ){ //alternatives
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int others=0;
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serverByteBuffer text= new serverByteBuffer();
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PushbackInputStream pis2;
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transferUntil(pis, keyStream, aClose);
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key = keyStream.toByteArray(); //Caution: Key does not contain prefix
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/* DEBUG - print key + value
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try{
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System.out.println("Key: "+prefix+key+ "; Value: "+pattern.get(prefix+key));
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}catch(NullPointerException e){
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System.out.println("Key: "+prefix+key);
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}
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*/
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keyStream=new ByteArrayOutputStream(); //clear
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boolean byName=false;
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int whichPattern=0;
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byte[] patternName = new byte[0];
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String patternKey = getPatternKey(prefix, key);
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if(pattern.containsKey(patternKey) && pattern.get(patternKey) != null){
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String patternId=(String)pattern.get(patternKey);
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try{
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whichPattern=Integer.parseInt(patternId); //index
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}catch(NumberFormatException e){
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whichPattern=0;
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byName=true;
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patternName=patternId.getBytes("UTF-8");
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}
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}else{
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//System.out.println("Pattern \""+new String(prefix + key)+"\" is not set"); //DEBUG
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}
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int currentPattern=0;
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boolean found=false;
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keyStream = new ByteArrayOutputStream(); //reset stream
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if(byName){
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//TODO: better Error Handling
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transferUntil(pis, keyStream,appendBytes("%%".getBytes("UTF-8"),patternName,null,null));
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if(pis.available()==0){
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serverLog.logSevere("TEMPLATE", "No such Template: %%"+patternName);
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return structure.getBytes();
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}
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keyStream=new ByteArrayOutputStream();
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transferUntil(pis, keyStream, "::".getBytes());
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pis2 = new PushbackInputStream(new ByteArrayInputStream(keyStream.toByteArray()));
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structure.append(writeTemplate(pis2, out, pattern, dflt, newPrefix(prefix,key)));
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transferUntil(pis, keyStream, appendBytes("#(/".getBytes("UTF-8"),key,")#".getBytes("UTF-8"),null));
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if(pis.available()==0){
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serverLog.logSevere("TEMPLATE", "No Close Key found for #("+new String(key)+")# (by Name)");
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}
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}else{
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while(!found){
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bb=pis.read();
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if( (bb & 0xFF) == hash){
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bb=pis.read();
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if( (bb & 0xFF) == lrbr){
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transferUntil(pis, keyStream, aClose);
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//reached the end. output last string.
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if (java.util.Arrays.equals(keyStream.toByteArray(),appendBytes(slash, key, null,null))) {
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pis2 = new PushbackInputStream(new ByteArrayInputStream(text.getBytes()));
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//this maybe the wrong, but its the last
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structure.append("<".getBytes("UTF-8")).append(key).append(" type=\"alternative\" which=\"".getBytes("UTF-8")).append(Integer.toString(whichPattern).getBytes("UTF-8")).append("\" found=\"0\">\n".getBytes("UTF-8"));
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structure.append(writeTemplate(pis2, out, pattern, dflt, newPrefix(prefix,key)));
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structure.append("</".getBytes("UTF-8")).append(key).append(">\n".getBytes("UTF-8"));
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found=true;
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}else if(others >0 && keyStream.toString().startsWith("/")){ //close nested
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others--;
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text.append("#(".getBytes("UTF-8")).append(keyStream.toByteArray()).append(")#".getBytes("UTF-8"));
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}else{ //nested
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others++;
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text.append("#(".getBytes("UTF-8")).append(keyStream.toByteArray()).append(")#".getBytes("UTF-8"));
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}
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keyStream = new ByteArrayOutputStream(); //reset stream
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continue;
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}else{ //is not #(
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pis.unread(bb);//is processed in next loop
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bb = (hash);//will be added to text this loop
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//text += "#";
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}
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}else if( (bb & 0xFF) == ':' && others==0){//ignore :: in nested Expressions
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bb=pis.read();
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if( (bb & 0xFF) == ':'){
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if(currentPattern == whichPattern){ //found the pattern
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pis2 = new PushbackInputStream(new ByteArrayInputStream(text.getBytes()));
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structure.append("<".getBytes("UTF-8")).append(key).append(" type=\"alternative\" which=\"".getBytes("UTF-8")).append(Integer.toString(whichPattern).getBytes("UTF-8")).append("\" found=\"0\">\n".getBytes("UTF-8"));
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structure.append(writeTemplate(pis2, out, pattern, dflt, newPrefix(prefix,key)));
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structure.append("</".getBytes("UTF-8")).append(key).append(">\n".getBytes("UTF-8"));
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transferUntil(pis, keyStream, appendBytes("#(/".getBytes("UTF-8"),key,")#".getBytes("UTF-8"),null));//to #(/key)#.
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found=true;
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}
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currentPattern++;
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text.clear();
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continue;
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}else{
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text.append(":".getBytes("UTF-8"));
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}
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}
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if(!found){
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text.append((byte)bb);
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if(pis.available()==0){
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serverLog.logSevere("TEMPLATE", "No Close Key found for #("+new String(key)+")# (by Index)");
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found=true;
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}
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}
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}//while
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}//if(byName) (else branch)
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}else if( (bb & 0xFF) == lbr ){ //normal
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if (transferUntil(pis, keyStream, pClose)) {
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// pattern detected, write replacement
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key = keyStream.toByteArray();
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String patternKey = getPatternKey(prefix, key);
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replacement = replacePattern(patternKey, pattern, dflt); //replace
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structure.append("<".getBytes("UTF-8")).append(key).append(" type=\"normal\">\n".getBytes("UTF-8"));
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structure.append(replacement);
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structure.append("</".getBytes("UTF-8")).append(key).append(">\n".getBytes("UTF-8"));
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/* DEBUG
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try{
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System.out.println("Key: "+key+ "; Value: "+pattern.get(key));
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}catch(NullPointerException e){
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System.out.println("Key: "+key);
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}
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*/
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|
|
|
serverFileUtils.write(replacement, out);
|
|
} else {
|
|
// inconsistency, simply finalize this
|
|
serverFileUtils.copy(pis, out);
|
|
return structure.getBytes();
|
|
}
|
|
}else if( (bb & 0xFF) == ps){ //include
|
|
serverByteBuffer include = new serverByteBuffer();
|
|
keyStream = new ByteArrayOutputStream(); //reset stream
|
|
if(transferUntil(pis, keyStream, iClose)){
|
|
byte[] filename = keyStream.toByteArray();
|
|
//if(filename.startsWith( Character.toString((char)lbr) ) && filename.endsWith( Character.toString((char)rbr) )){ //simple pattern for filename
|
|
if((filename[0] == lbr) && (filename[filename.length-1] == rbr)){ //simple pattern for filename
|
|
byte[] newFilename = new byte[filename.length-2];
|
|
System.arraycopy(filename, 1, newFilename, 0, newFilename.length);
|
|
String patternkey = getPatternKey(prefix, newFilename);
|
|
filename= replacePattern(patternkey, pattern, dflt);
|
|
}
|
|
if (filename.length > 0 && !java.util.Arrays.equals(filename, dflt)) {
|
|
BufferedReader br = null;
|
|
try{
|
|
//br = new BufferedReader(new InputStreamReader(new FileInputStream( filename ))); //Simple Include
|
|
br = new BufferedReader( new InputStreamReader(new FileInputStream( httpdFileHandler.getLocalizedFile(new String(filename,"UTF-8"))),"UTF-8") ); //YaCy (with Locales)
|
|
//Read the Include
|
|
String line = "";
|
|
while( (line = br.readLine()) != null ){
|
|
include.append(line.getBytes("UTF-8")).append(de.anomic.server.serverCore.crlfString.getBytes("UTF-8"));
|
|
}
|
|
}catch(IOException e){
|
|
//file not found?
|
|
serverLog.logSevere("FILEHANDLER","Include Error with file: " + new String(filename, "UTF-8"));
|
|
} finally {
|
|
if (br != null) try { br.close(); br=null; } catch (Exception e) {}
|
|
}
|
|
PushbackInputStream pis2 = new PushbackInputStream(new ByteArrayInputStream(include.getBytes()));
|
|
structure.append("<fileinclude file=\"".getBytes("UTF-8")).append(filename).append(">\n".getBytes("UTF-8"));
|
|
structure.append(writeTemplate(pis2, out, pattern, dflt, prefix));
|
|
structure.append("</fileinclude>\n".getBytes("UTF-8"));
|
|
}
|
|
}
|
|
}else{ //no match, but a single hash (output # + bb)
|
|
byte[] tmp=new byte[2];
|
|
tmp[0]=hash;
|
|
tmp[1]=(byte)bb;
|
|
serverFileUtils.write(tmp, out);
|
|
}
|
|
}
|
|
//System.out.println(structure.toString()); //DEBUG
|
|
return structure.getBytes();
|
|
}
|
|
|
|
public static byte[] replacePattern(String key, Hashtable pattern, byte dflt[]) {
|
|
byte[] replacement;
|
|
Object value;
|
|
if (pattern.containsKey(key)) {
|
|
value = pattern.get(key);
|
|
try {
|
|
if (value instanceof byte[]) {
|
|
replacement = (byte[]) value;
|
|
} else if (value instanceof String) {
|
|
//replacement = ((String) value).getBytes();
|
|
replacement = ((String) value).getBytes("UTF-8");
|
|
} else {
|
|
//replacement = value.toString().getBytes();
|
|
replacement = value.toString().getBytes("UTF-8");
|
|
}
|
|
} catch (UnsupportedEncodingException e) {
|
|
replacement = dflt;
|
|
}
|
|
} else {
|
|
replacement = dflt;
|
|
}
|
|
return replacement;
|
|
}
|
|
|
|
public static void main(String[] args) {
|
|
// arg1 = test input; arg2 = replacement for pattern 'test'; arg3 = default replacement
|
|
try {
|
|
InputStream i = new ByteArrayInputStream(args[0].getBytes());
|
|
Hashtable h = new Hashtable();
|
|
h.put("test", args[1].getBytes());
|
|
writeTemplate(new PushbackInputStream(i, 100), System.out, h, args[2].getBytes());
|
|
System.out.flush();
|
|
} catch (Exception e) {
|
|
e.printStackTrace();
|
|
}
|
|
}
|
|
/*
|
|
* loads all Files from path into a filename->content HashMap
|
|
*/
|
|
public static HashMap loadTemplates(File path) {
|
|
// reads all templates from a path
|
|
// we use only the folder from the given file path
|
|
HashMap result = new HashMap();
|
|
if (path == null) return result;
|
|
if (!(path.isDirectory())) path = path.getParentFile();
|
|
if ((path == null) || (!(path.isDirectory()))) return result;
|
|
String[] templates = path.list();
|
|
for (int i = 0; i < templates.length; i++) {
|
|
if (templates[i].endsWith(".template"))
|
|
try {
|
|
//System.out.println("TEMPLATE " + templates[i].substring(0, templates[i].length() - 9) + ": " + new String(buf, 0, c));
|
|
result.put(templates[i].substring(0, templates[i].length() - 9),
|
|
new String(serverFileUtils.read(new File(path, templates[i]))));
|
|
} catch (Exception e) {}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
public static byte[] newPrefix(byte[] oldPrefix, byte[] key) {
|
|
serverByteBuffer newPrefix = new serverByteBuffer();
|
|
newPrefix.append(oldPrefix)
|
|
.append(key)
|
|
.append("_".getBytes());
|
|
return newPrefix.getBytes();
|
|
}
|
|
|
|
public static byte[] newPrefix(byte[] oldPrefix, byte[] multi_key, int i) {
|
|
serverByteBuffer newPrefix = new serverByteBuffer();
|
|
try {
|
|
newPrefix.append(oldPrefix)
|
|
.append(multi_key)
|
|
.append("_".getBytes())
|
|
.append(Integer.toString(i).getBytes("UTF-8"))
|
|
.append("_".getBytes());
|
|
|
|
} catch (UnsupportedEncodingException e) {}
|
|
return newPrefix.getBytes();
|
|
}
|
|
|
|
public static String getPatternKey(byte[] prefix, byte[] key) {
|
|
serverByteBuffer patternKey = new serverByteBuffer();
|
|
patternKey.append(prefix)
|
|
.append(key);
|
|
try {
|
|
return new String(patternKey.getBytes(),"UTF-8");
|
|
} catch (UnsupportedEncodingException e) {
|
|
return null;
|
|
}
|
|
}
|
|
|
|
public static byte[] appendBytes(byte[] b1, byte[] b2, byte[] b3, byte[] b4) {
|
|
serverByteBuffer byteArray = new serverByteBuffer();
|
|
byteArray.append(b1)
|
|
.append(b2);
|
|
if (b3 != null) byteArray.append(b3);
|
|
if (b4 != null) byteArray.append(b4);
|
|
return byteArray.getBytes();
|
|
}
|
|
|
|
}
|