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f17ce28b6d
yacy_search_server/htroot/ViewFile.java
theli f17ce28b6d *) plasmaHTCache: 
- method loadResourceContent defined as deprecated. 
     Please do not use this function to avoid OutOfMemory Exceptions 
     when loading large files
   - new function getResourceContentStream to get an inputstream of a cache file
   - new function getResourceContentLength to get the size of a cached file
*) httpc.java:
   - Bugfix: resource content was loaded into memory even if this was not requested
*) Crawler:
   - new option to hold loaded resource content in memory
   - adding option to use the worker class without the worker pool 
     (needed by the snippet fetcher)
*) plasmaSnippetCache
   - snippet loader does not use a crawl-worker from pool but uses
     a newly created instance to avoid blocking by normal crawling
     activity.
   - now operates on streams instead of byte arrays to avoid OutOfMemory 
     Exceptions when operating on large files 
   - snippet loader now forces the crawl-worker to keep the loaded
     resource in memory to avoid IO 
*) plasmaCondenser: adding new function getWords that can directly operate on input streams
*) Parsers
   - keep resource in memory whenever possible (to avoid IO)
   - when parsing from stream the content length must be passed to the parser function now.
     this length value is needed by the parsers to decide if the parsed resource content is to large
     to hold it in memory and must be stored to file 
   - AbstractParser.java: new function to pass the contentLength of a resource to the parsers
   


git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@2701 6c8d7289-2bf4-0310-a012-ef5d649a1542
2006-10-03 11:05:48 +00:00

307 lines
14 KiB
Java
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//ViewFile.java
//-----------------------
//part of YaCy
//(C) by Michael Peter Christen; mc@anomic.de
//first published on http://www.anomic.de
//Frankfurt, Germany, 2004
//last major change: 12.07.2004
//This program is free software; you can redistribute it and/or modify
//it under the terms of the GNU General Public License as published by
//the Free Software Foundation; either version 2 of the License, or
//(at your option) any later version.
//This program is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
//GNU General Public License for more details.
//You should have received a copy of the GNU General Public License
//along with this program; if not, write to the Free Software
//Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//Using this software in any meaning (reading, learning, copying, compiling,
//running) means that you agree that the Author(s) is (are) not responsible
//for cost, loss of data or any harm that may be caused directly or indirectly
//by usage of this softare or this documentation. The usage of this software
//is on your own risk. The installation and usage (starting/running) of this
//software may allow other people or application to access your computer and
//any attached devices and is highly dependent on the configuration of the
//software which must be done by the user of the software; the author(s) is
//(are) also not responsible for proper configuration and usage of the
//software, even if provoked by documentation provided together with
//the software.
//Any changes to this file according to the GPL as documented in the file
//gpl.txt aside this file in the shipment you received can be done to the
//lines that follows this copyright notice here, but changes must not be
//done inside the copyright notive above. A re-distribution must contain
//the intact and unchanged copyright notice.
//Contributions and changes to the program code must be marked as such.
//you must compile this file with
//javac -classpath .:../Classes Status.java
//if the shell's current path is HTROOT
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import de.anomic.data.wikiCode;
import de.anomic.http.httpHeader;
import de.anomic.http.httpc;
import de.anomic.net.URL;
import de.anomic.plasma.plasmaHTCache;
import de.anomic.plasma.plasmaParserDocument;
import de.anomic.plasma.plasmaSwitchboard;
import de.anomic.plasma.cache.IResourceInfo;
import de.anomic.plasma.crawler.plasmaCrawlerException;
import de.anomic.plasma.parser.ParserException;
import de.anomic.plasma.plasmaCrawlLURL.Entry;
import de.anomic.server.serverFileUtils;
import de.anomic.server.serverObjects;
import de.anomic.server.serverSwitch;
public class ViewFile {
public static final int VIEW_MODE_NO_TEXT = 0;
public static final int VIEW_MODE_AS_PLAIN_TEXT = 1;
public static final int VIEW_MODE_AS_PARSED_TEXT = 2;
public static final int VIEW_MODE_AS_PARSED_SENTENCES = 3;
public static final int VIEW_MODE_AS_IFRAME = 4;
public static final String[] highlightingColors = new String[] {
"255,255,100",
"255,155,155",
"0,255,0",
"0,255,255",
"204,153,0",
"204,153,255"
};
public static serverObjects respond(httpHeader header, serverObjects post, serverSwitch env) {
serverObjects prop = new serverObjects();
plasmaSwitchboard sb = (plasmaSwitchboard)env;
if (post != null && post.containsKey("words"))
try {
prop.put("error_words",URLEncoder.encode((String) post.get("words"), "UTF-8"));
} catch (UnsupportedEncodingException e1) {
// ignore this. this should not occure
}
// getting the url hash from which the content should be loaded
String urlHash = post.get("urlHash","");
if (urlHash.equals("")) {
prop.put("error",1);
prop.put("viewMode",VIEW_MODE_NO_TEXT);
return prop;
}
String viewMode = post.get("viewMode","sentences");
// getting the urlEntry that belongs to the url hash
Entry urlEntry = null;
urlEntry = sb.urlPool.loadedURL.load(urlHash, null);
if (urlEntry == null) {
prop.put("error",2);
prop.put("viewMode",VIEW_MODE_NO_TEXT);
return prop;
}
// gettin the url that belongs to the entry
URL url = urlEntry.url();
if (url == null) {
prop.put("error",3);
prop.put("viewMode",VIEW_MODE_NO_TEXT);
return prop;
}
// loading the resource content as byte array
InputStream resource = null;
long resourceLength = -1;
IResourceInfo resInfo = null;
String resMime = null;
try {
// trying to load the resource body
resource = sb.cacheManager.getResourceContentStream(url);
resourceLength = sb.cacheManager.getResourceContentLength(url);
// if the resource body was not cached we try to load it from web
if (resource == null) {
plasmaHTCache.Entry entry = null;
try {
entry = sb.snippetCache.loadResourceFromWeb(url, 5000, false);
} catch (plasmaCrawlerException e) {
prop.put("error",4);
prop.put("error_errorText",e.getMessage());
prop.put("viewMode",VIEW_MODE_NO_TEXT);
return prop;
}
if (entry != null) {
resInfo = entry.getDocumentInfo();
resource = sb.cacheManager.getResourceContentStream(url);
resourceLength = sb.cacheManager.getResourceContentLength(url);
}
if (resource == null) {
prop.put("error",4);
prop.put("error_errorText","No resource available");
prop.put("viewMode",VIEW_MODE_NO_TEXT);
return prop;
}
}
// try to load resource metadata
if (resInfo == null) {
// try to load the metadata from cache
try {
resInfo = sb.cacheManager.loadResourceInfo(urlEntry.url());
} catch (Exception e) { /* ignore this */}
// if the metadata where not cached try to load it from web
if (resInfo == null) {
String protocol = url.getProtocol();
if (!((protocol.equals("http") || protocol.equals("https")))) {
prop.put("error",6);
prop.put("viewMode",VIEW_MODE_NO_TEXT);
return prop;
}
httpHeader responseHeader = httpc.whead(url,url.getHost(),5000,null,null,sb.remoteProxyConfig);
if (responseHeader == null) {
prop.put("error",4);
prop.put("error_errorText","Unable to load resource metadata.");
prop.put("viewMode",VIEW_MODE_NO_TEXT);
return prop;
}
try {
resInfo = sb.cacheManager.getResourceInfoFactory().buildResourceInfoObj(url, responseHeader);
} catch (Exception e) {
prop.put("error",4);
prop.put("error_errorText",e.getMessage());
prop.put("viewMode",VIEW_MODE_NO_TEXT);
return prop;
}
resMime = responseHeader.mime();
}
} else {
resMime = resInfo.getMimeType();
}
} catch (IOException e) {
if (resource != null) try { resource.close(); } catch (Exception ex) {/* ignore this */}
prop.put("error",4);
prop.put("error_errorText",e.getMessage());
prop.put("viewMode",VIEW_MODE_NO_TEXT);
return prop;
}
if (viewMode.equals("plain")) {
// TODO: how to handle very large files here ?
String content;
try {
content = new String(serverFileUtils.read(resource),"UTF-8");
} catch (Exception e) {
prop.put("error",4);
prop.put("error_errorText",e.getMessage());
prop.put("viewMode",VIEW_MODE_NO_TEXT);
return prop;
} finally {
if (resource != null) try { resource.close(); } catch (Exception e) {/* ignore this */}
}
content = content.replaceAll("<","&lt;")
.replaceAll(">","&gt;")
.replaceAll("\"","&quot;")
.replaceAll("\n","<br>")
.replaceAll("\t","&nbsp;&nbsp;&nbsp;&nbsp;");
prop.put("error",0);
prop.put("viewMode",VIEW_MODE_AS_PLAIN_TEXT);
prop.put("viewMode_plainText",content);
} else if (viewMode.equals("iframe")) {
prop.put("viewMode",VIEW_MODE_AS_IFRAME);
prop.put("viewMode_url",url.toString());
} else if (viewMode.equals("parsed") || viewMode.equals("sentences")) {
// parsing the resource content
plasmaParserDocument document = null;
try {
document = sb.snippetCache.parseDocument(url, resourceLength, resource,resInfo);
if (document == null) {
prop.put("error",5);
prop.put("error_errorText","Unknown error");
prop.put("viewMode",VIEW_MODE_NO_TEXT);
return prop;
}
} catch (ParserException e) {
prop.put("error",5);
prop.put("error_errorText",e.getMessage());
prop.put("viewMode",VIEW_MODE_NO_TEXT);
return prop;
} finally {
if (resource != null) try { resource.close(); } catch (Exception e) {/* ignore this */}
}
resMime = document.getMimeType();
if (viewMode.equals("parsed")) {
String content = new String(document.getTextBytes());
content = wikiCode.replaceHTML(content); //added by Marc Nause
content = content.replaceAll("\n","<br>")
.replaceAll("\t","&nbsp;&nbsp;&nbsp;&nbsp;");
prop.put("viewMode",VIEW_MODE_AS_PARSED_TEXT);
prop.put("viewMode_parsedText",content);
} else {
prop.put("viewMode",VIEW_MODE_AS_PARSED_SENTENCES);
String[] sentences = document.getSentences();
boolean dark = true;
for (int i=0; i < sentences.length; i++) {
String currentSentence = wikiCode.replaceHTML(sentences[i]);
// Search word highlighting
String words = post.get("words",null);
if (words != null) {
try {
words = URLDecoder.decode(words,"UTF-8");
} catch (UnsupportedEncodingException e) {}
String[] wordArray = words.substring(1,words.length()-1).split(",");
for (int j=0; j < wordArray.length; j++) {
String currentWord = wordArray[j].trim();
currentSentence = currentSentence.replaceAll(currentWord,
"<b style=\"color: black; background-color: rgb(" + highlightingColors[j%6] + ");\">" + currentWord + "</b>");
}
}
prop.put("viewMode_sentences_" + i + "_nr",Integer.toString(i+1));
prop.put("viewMode_sentences_" + i + "_text",currentSentence);
prop.put("viewMode_sentences_" + i + "_dark",((dark) ? 1 : 0) ); dark=!dark;
}
prop.put("viewMode_sentences",sentences.length);
}
if (document != null) document.close();
}
prop.put("error",0);
prop.put("error_url",url.toString());
prop.put("error_hash",urlHash);
prop.put("error_wordCount",Integer.toString(urlEntry.wordCount()));
prop.put("error_desc",urlEntry.descr());
prop.put("error_size",urlEntry.size());
prop.put("error_mimeType",resMime);
return prop;
}
}
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