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https://github.com/yacy/yacy_search_server.git
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788288eb9e
The default schema uses only some of them and the resting search index has now the following properties: - webgraph size will have about 40 times as much entries as default index - the complete index size will increase and may be about the double size of current amount As testing showed, not much indexing performance is lost. The default index will be smaller (moved fields out of it); thus searching can be faster. The new index will cause that some old parts in YaCy can be removed, i.e. specialized webgraph data and the noload crawler. The new index will make it possible to: - search within link texts of linked but not indexed documents (about 20 times of document index in size!!) - get a very detailed link graph - enhance ranking using a complete link graph To get the full access to the new index, the API to solr has now two access points: one with attribute core=collection1 for the default search index and core=webgraph to the new webgraph search index. This is also avaiable for p2p operation but client access is not yet implemented.
179 lines
6.5 KiB
Java
179 lines
6.5 KiB
Java
// ScraperInputStream.java
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// (C) 2005, 2006 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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// first published 2005 on http://www.anomic.de
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//
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// This is a part of YaCy, a peer-to-peer based web search engine
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//
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// $LastChangedDate$
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// $LastChangedRevision$
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// $LastChangedBy$
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//
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// LICENSE
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//
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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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//
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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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//
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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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package net.yacy.document.parser.html;
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import java.io.BufferedInputStream;
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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.Reader;
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import java.io.UnsupportedEncodingException;
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import java.io.Writer;
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import java.util.Properties;
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import net.yacy.kelondro.data.meta.DigestURI;
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public class ScraperInputStream extends InputStream implements ScraperListener {
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private static final int MODE_PRESCAN = 0;
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private static final int MODE_PRESCAN_FINISHED = 1;
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private int mode = 1;
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private static final long preBufferSize = 4096;
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private long preRead = 0;
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private final BufferedInputStream bufferedIn;
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private String detectedCharset;
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private boolean charsetChanged = false;
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private boolean endOfHead = false;
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private Reader reader;
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private Writer writer;
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public ScraperInputStream(
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final InputStream inStream,
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final String inputStreamCharset,
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final DigestURI rooturl,
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final Transformer transformer,
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final boolean passbyIfBinarySuspect,
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final int maxLinks
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) {
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// create a input stream for buffereing
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this.bufferedIn = new BufferedInputStream(inStream, (int) preBufferSize);
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this.bufferedIn.mark((int) preBufferSize);
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final ContentScraper scraper = new ContentScraper(rooturl, maxLinks);
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scraper.registerHtmlFilterEventListener(this);
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try {
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this.reader = (inputStreamCharset == null) ? new InputStreamReader(this) : new InputStreamReader(this,inputStreamCharset);
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} catch (UnsupportedEncodingException e) {
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try {
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this.reader = new InputStreamReader(this, "UTF-8");
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} catch (UnsupportedEncodingException e1) {
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// how is that possible?
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this.reader = new InputStreamReader(this);
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}
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}
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this.writer = new TransformerWriter(null,null,scraper,transformer,passbyIfBinarySuspect);
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}
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private static String extractCharsetFromMimetypeHeader(final String mimeType) {
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if (mimeType == null) return null;
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final String[] parts = mimeType.split(";");
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if (parts == null || parts.length <= 1) return null;
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for (int i=1; i < parts.length; i++) {
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final String param = parts[i].trim();
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if (param.startsWith("charset=")) {
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String charset = param.substring("charset=".length()).trim();
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if (charset.length() > 0 && (charset.charAt(0) == '\"' || charset.charAt(0) == '\'')) charset = charset.substring(1);
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if (charset.endsWith("\"") || charset.endsWith("'")) charset = charset.substring(0,charset.length()-1);
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return charset.trim();
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}
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}
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return null;
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}
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@Override
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public void scrapeTag0(final String tagname, final Properties tagopts) {
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if (tagname == null || tagname.isEmpty()) return;
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if (tagname.equalsIgnoreCase("meta")) {
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if (tagopts.containsKey("http-equiv")) {
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final String value = tagopts.getProperty("http-equiv");
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if (value.equalsIgnoreCase("Content-Type")) {
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// parse lines like <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
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final String contentType = tagopts.getProperty("content","");
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this.detectedCharset = extractCharsetFromMimetypeHeader(contentType);
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if (this.detectedCharset != null && this.detectedCharset.length() > 0) {
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this.charsetChanged = true;
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} else if (tagopts.containsKey("charset")) {
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// sometimes the charset property is configured as extra attribut. try it ...
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this.detectedCharset = tagopts.getProperty("charset");
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this.charsetChanged = true;
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}
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}
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}
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}
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}
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@Override
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public void scrapeTag1(final String tagname, final Properties tagopts, final char[] text) {
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if (tagname == null || tagname.isEmpty()) return;
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if (tagname.equalsIgnoreCase("head")) {
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this.endOfHead = true;
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}
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}
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public String detectCharset() throws IOException {
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this.mode = MODE_PRESCAN;
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// loop until we have detected the header element or the charset data
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int c;
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while ((c = this.reader.read())!= -1) {
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this.writer.write(c);
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if (this.charsetChanged) break; // thats enough
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}
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// free writer
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this.writer = null;
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// don't close writer here, otherwise it will shutdown our source stream
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// reset the buffer if not already done
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if (this.mode != MODE_PRESCAN_FINISHED) {
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this.mode++;
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this.bufferedIn.reset();
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}
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// return scanning result
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return (this.charsetChanged) ? this.detectedCharset : null;
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}
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@Override
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public int read() throws IOException {
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// mode 0 is called from within the detectCharset function
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if (this.mode == MODE_PRESCAN) {
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if (this.endOfHead || this.charsetChanged || this.preRead >= preBufferSize - 1) {
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return -1;
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}
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this.preRead++;
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}
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return this.bufferedIn.read();
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}
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@Override
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public synchronized void close() throws IOException {
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if (this.writer != null) this.writer.close();
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}
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}
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