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@ -47,17 +47,17 @@ package de.anomic.plasma;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.ArrayList;
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import java.util.Enumeration;
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import java.util.HashMap;
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import java.util.HashSet;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.regex.Pattern;
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import java.util.regex.Matcher;
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import java.util.regex.PatternSyntaxException;
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import java.util.Set;
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import java.util.TreeMap;
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import java.util.TreeSet;
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import de.anomic.htmlFilter.htmlFilterImageEntry;
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import de.anomic.http.httpHeader;
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import de.anomic.http.httpc;
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import de.anomic.plasma.plasmaURL;
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@ -109,11 +109,11 @@ public class plasmaSnippetCache {
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this.snippetsCache = new HashMap();
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}
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public class Snippet {
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public class TextSnippet {
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private String line;
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private String error;
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private int source;
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public Snippet(String line, int source, String errortext) {
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public TextSnippet(String line, int source, String errortext) {
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this.line = line;
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this.source = source;
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this.error = errortext;
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@ -151,35 +151,19 @@ public class plasmaSnippetCache {
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prefix = "";
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postfix = "";
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//cut off prefix if it contains of non-characters or non-numbers
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while(w[j].matches("\\A[^\\p{L}\\p{N}].+")) {
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while((w[j].matches("\\A[^\\p{L}\\p{N}].+"))) {
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prefix = w[j].substring(0,1) + prefix;
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w[j] = w[j].substring(1);
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}
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//cut off postfix if it contains of non-characters or non-numbers
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while(w[j].matches(".+[^\\p{L}\\p{N}]\\Z")) {
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while((w[j].matches(".+[^\\p{L}\\p{N}]\\Z"))) {
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len = w[j].length();
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postfix = w[j].substring(len-1,len) + postfix;
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w[j] = w[j].substring(0,len-1);
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}
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//recursion if there are non-characters or non-numbers in the middle of the string
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Pattern p = Pattern.compile("\\A([\\p{L}\\p{N}]+)([^\\p{L}\\p{N}])([\\p{L}\\p{N}]+)\\Z");
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Matcher m = p.matcher(w[j]);
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if(m.find()) {
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String left = m.group(1);
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String pattern = m.group(2);
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String right = m.group(3);
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Snippet snip = new Snippet(left,-1,null);
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w[j] = snip.getLineMarked(queryHashes);
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w[j] = w[j] + pattern;
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snip = new Snippet(right,-1,null);
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w[j] = w[j] + snip.getLineMarked(queryHashes);
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}
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//end contrib [MN]
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else if (plasmaCondenser.word2hash(w[j]).equals(h)) w[j] = "<b>" + w[j] + "</b>";
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if (plasmaCondenser.word2hash(w[j]).equals(h)) w[j] = "<b>" + w[j] + "</b>";
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w[j] = prefix + w[j] + postfix;
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}
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}
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@ -195,16 +179,26 @@ public class plasmaSnippetCache {
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}
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}
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public class MediaSnippet {
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public String type, href, name, attr;
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public MediaSnippet(String type, String href, String name, String attr) {
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this.type = type;
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this.href = href;
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this.name = name;
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this.attr = attr;
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}
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}
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public boolean existsInCache(URL url, Set queryhashes) {
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String hashes = yacySearch.set2string(queryhashes);
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return retrieveFromCache(hashes, plasmaURL.urlHash(url)) != null;
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}
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public Snippet retrieveSnippet(URL url, Set queryhashes, boolean fetchOnline, boolean pre, int snippetMaxLength, int timeout) {
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public TextSnippet retrieveTextSnippet(URL url, Set queryhashes, boolean fetchOnline, boolean pre, int snippetMaxLength, int timeout) {
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// heise = "0OQUNU3JSs05"
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if (queryhashes.size() == 0) {
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//System.out.println("found no queryhashes for URL retrieve " + url);
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return new Snippet(null, ERROR_NO_HASH_GIVEN, "no query hashes given");
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return new TextSnippet(null, ERROR_NO_HASH_GIVEN, "no query hashes given");
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}
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String urlhash = plasmaURL.urlHash(url);
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@ -214,7 +208,7 @@ public class plasmaSnippetCache {
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String line = retrieveFromCache(wordhashes, urlhash);
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if (line != null) {
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//System.out.println("found snippet for URL " + url + " in cache: " + line);
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return new Snippet(line, source, null);
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return new TextSnippet(line, source, null);
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}
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/* ===========================================================================
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@ -252,15 +246,15 @@ public class plasmaSnippetCache {
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}
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// if it is still not available, report an error
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if (resContent == null) return new Snippet(null, ERROR_RESOURCE_LOADING, "error loading resource, plasmaHTCache.Entry cache is NULL");
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if (resContent == null) return new TextSnippet(null, ERROR_RESOURCE_LOADING, "error loading resource, plasmaHTCache.Entry cache is NULL");
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source = SOURCE_WEB;
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} else {
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return new Snippet(null, ERROR_SOURCE_LOADING, "no resource available");
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return new TextSnippet(null, ERROR_SOURCE_LOADING, "no resource available");
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}
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} catch (Exception e) {
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if (!(e instanceof plasmaCrawlerException)) e.printStackTrace();
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return new Snippet(null, ERROR_SOURCE_LOADING, "error loading resource: " + e.getMessage());
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return new TextSnippet(null, ERROR_SOURCE_LOADING, "error loading resource: " + e.getMessage());
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}
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/* ===========================================================================
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@ -270,11 +264,11 @@ public class plasmaSnippetCache {
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try {
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document = parseDocument(url, resContentLength, resContent, resInfo);
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} catch (ParserException e) {
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return new Snippet(null, ERROR_PARSER_FAILED, e.getMessage()); // cannot be parsed
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return new TextSnippet(null, ERROR_PARSER_FAILED, e.getMessage()); // cannot be parsed
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} finally {
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try { resContent.close(); } catch (Exception e) {/* ignore this */}
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}
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if (document == null) return new Snippet(null, ERROR_PARSER_FAILED, "parser error/failed"); // cannot be parsed
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if (document == null) return new TextSnippet(null, ERROR_PARSER_FAILED, "parser error/failed"); // cannot be parsed
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/* ===========================================================================
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@ -284,7 +278,7 @@ public class plasmaSnippetCache {
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// compute snippet from text
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final Iterator sentences = document.getSentences(pre);
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if (sentences == null) return new Snippet(null, ERROR_PARSER_NO_LINES, "parser returned no sentences");
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if (sentences == null) return new TextSnippet(null, ERROR_PARSER_NO_LINES, "parser returned no sentences");
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String textline = computeTextSnippet(sentences, queryhashes, 3 * queryhashes.size(), snippetMaxLength);
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// compute snippet from media
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@ -301,13 +295,13 @@ public class plasmaSnippetCache {
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//if (hrefline != null) line += (line.length() == 0) ? hrefline : "<br />" + hrefline;
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if (textline != null) line += (line.length() == 0) ? textline : "<br />" + textline;
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if ((line == null) || (line.length() < 3 /*snippetMinLength*/)) return new Snippet(null, ERROR_NO_MATCH, "no matching snippet found");
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if ((line == null) || (line.length() < 3 /*snippetMinLength*/)) return new TextSnippet(null, ERROR_NO_MATCH, "no matching snippet found");
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if (line.length() > snippetMaxLength) line = line.substring(0, snippetMaxLength);
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// finally store this snippet in our own cache
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storeToCache(wordhashes, urlhash, line);
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document.close();
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return new Snippet(line, source, null);
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return new TextSnippet(line, source, null);
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}
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/**
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@ -319,51 +313,66 @@ public class plasmaSnippetCache {
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* @param fetchOnline specifies if the resource should be loaded from web if it'as not available in the cache
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* @return the parsed document as {@link plasmaParserDocument}
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*/
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public plasmaParserDocument retrieveDocument(URL url, boolean fetchOnline) {
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if (url == null) return null;
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IResourceInfo docInfo = null;
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public plasmaParserDocument retrieveDocument(URL url, boolean fetchOnline, int timeout) {
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// load resource
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long resContentLength = 0;
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InputStream resContent = null;
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IResourceInfo resInfo = null;
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try {
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// trying to load the resource body from cache
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InputStream content = this.cacheManager.getResourceContentStream(url);
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long resourceLength = this.cacheManager.getResourceContentLength(url);
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// if not available try to load resource from web
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if ((fetchOnline) && (content == null)) {
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// download resource using crawler
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plasmaHTCache.Entry entry = loadResourceFromWeb(url, 5000, true);
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// trying to load the resource from the cache
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resContent = this.cacheManager.getResourceContentStream(url);
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if (resContent != null) {
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// if the content was found
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resContentLength = this.cacheManager.getResourceContentLength(url);
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} else if (fetchOnline) {
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// if not found try to download it
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// fetching metadata of the resource (e.g. http headers for http resource)
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// download resource using the crawler and keep resource in memory if possible
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plasmaHTCache.Entry entry = loadResourceFromWeb(url, timeout, true);
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// getting resource metadata (e.g. the http headers for http resources)
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if (entry != null) {
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docInfo = entry.getDocumentInfo();
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byte[] resourceArray = entry.cacheArray();
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resInfo = entry.getDocumentInfo();
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// read resource body (if it is there)
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byte []resourceArray = entry.cacheArray();
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if (resourceArray != null) {
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// read resource body (if it is there)
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content = new ByteArrayInputStream(resourceArray);
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resourceLength = resourceArray.length;
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resContent = new ByteArrayInputStream(resourceArray);
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resContentLength = resourceArray.length;
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} else {
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// in case that the reosurce was not in ram, read it from disk
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content = this.cacheManager.getResourceContentStream(url);
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resourceLength = this.cacheManager.getResourceContentLength(url);
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resContent = this.cacheManager.getResourceContentStream(url);
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resContentLength = this.cacheManager.getResourceContentLength(url);
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}
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}
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// if it is still not available, report an error
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if (resContent == null) {
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serverLog.logFine("snippet fetch", "plasmaHTCache.Entry cache is NULL for url " + url);
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return null;
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}
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} else {
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// trying to load resource metadata
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docInfo = this.cacheManager.loadResourceInfo(url);
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serverLog.logFine("snippet fetch", "no resource available for url " + url);
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return null;
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}
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// parsing document
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if (content == null) return null;
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return parseDocument(url, resourceLength, content, docInfo);
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} catch (ParserException e) {
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this.log.logWarning("Unable to parse resource. " + e.getMessage());
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return null;
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} catch (Exception e) {
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this.log.logWarning("Unexpected error while retrieving document. " + e.getMessage(),e);
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serverLog.logFine("snippet fetch", "error loading resource: " + e.getMessage() + " for url " + url);
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return null;
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}
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}
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// parse resource
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plasmaParserDocument document = null;
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try {
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document = parseDocument(url, resContentLength, resContent, resInfo);
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} catch (ParserException e) {
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serverLog.logFine("snippet fetch", "parser error " + e.getMessage() + " for url " + url);
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return null;
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} finally {
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try { resContent.close(); } catch (Exception e) {}
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}
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return document;
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}
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public void storeToCache(String wordhashes, String urlhash, String snippet) {
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// generate key
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@ -550,6 +559,84 @@ public class plasmaSnippetCache {
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}
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}
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public ArrayList retrieveMediaSnippets(URL url, Set queryhashes, boolean fetchOnline, int timeout) {
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if (queryhashes.size() == 0) {
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serverLog.logFine("snippet fetch", "no query hashes given for url " + url);
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return new ArrayList();
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}
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plasmaParserDocument document = retrieveDocument(url, fetchOnline, timeout);
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ArrayList a = new ArrayList();
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if (document != null) {
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a.addAll(computeMediaSnippets(document, queryhashes, "audio"));
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a.addAll(computeMediaSnippets(document, queryhashes, "video"));
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a.addAll(computeMediaSnippets(document, queryhashes, "app"));
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a.addAll(computeImageSnippets(document, queryhashes));
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}
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return a;
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}
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public ArrayList computeMediaSnippets(plasmaParserDocument document, Set queryhashes, String mediatype) {
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if (document == null) return new ArrayList();
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Map media = null;
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if (mediatype.equals("audio")) media = document.getAudiolinks();
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else if (mediatype.equals("video")) media = document.getVideolinks();
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else if (mediatype.equals("app")) media = document.getApplinks();
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if (media == null) return null;
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Iterator i = media.entrySet().iterator();
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Map.Entry entry;
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String url, desc;
|
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Set s;
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ArrayList result = new ArrayList();
|
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|
|
|
while (i.hasNext()) {
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entry = (Map.Entry) i.next();
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url = (String) entry.getKey();
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|
desc = (String) entry.getValue();
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//result.add(new MediaSnippet(mediatype, url, (desc.length() == 0) ? url : desc, null));
|
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|
|
s = removeAppearanceHashes(url, queryhashes);
|
|
|
|
|
if (s.size() == 0) {
|
|
|
|
|
result.add(new MediaSnippet(mediatype, url, (desc.length() == 0) ? url : desc, null));
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
s = removeAppearanceHashes(desc, s);
|
|
|
|
|
if (s.size() == 0) {
|
|
|
|
|
result.add(new MediaSnippet(mediatype, url, (desc.length() == 0) ? url : desc, null));
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
return result;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
public ArrayList computeImageSnippets(plasmaParserDocument document, Set queryhashes) {
|
|
|
|
|
|
|
|
|
|
TreeSet images = document.getImages();
|
|
|
|
|
|
|
|
|
|
Iterator i = images.iterator();
|
|
|
|
|
htmlFilterImageEntry ientry;
|
|
|
|
|
String url, desc;
|
|
|
|
|
Set s;
|
|
|
|
|
ArrayList result = new ArrayList();
|
|
|
|
|
while (i.hasNext()) {
|
|
|
|
|
ientry = (htmlFilterImageEntry) i.next();
|
|
|
|
|
url = (String) ientry.url().toNormalform();
|
|
|
|
|
desc = (String) ientry.alt();
|
|
|
|
|
//result.add(new MediaSnippet("image", url, (desc.length() == 0) ? url : desc, ientry.width() + " x " + ientry.height()));
|
|
|
|
|
s = removeAppearanceHashes(url, queryhashes);
|
|
|
|
|
if (s.size() == 0) {
|
|
|
|
|
result.add(new MediaSnippet("image", url, (desc.length() == 0) ? url : desc, ientry.width() + " x " + ientry.height()));
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
s = removeAppearanceHashes(desc, s);
|
|
|
|
|
if (s.size() == 0) {
|
|
|
|
|
result.add(new MediaSnippet("image", url, (desc.length() == 0) ? url : desc, ientry.width() + " x " + ientry.height()));
|
|
|
|
|
continue;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
return result;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
private Set removeAppearanceHashes(String sentence, Set queryhashes) {
|
|
|
|
|
// remove all hashes that appear in the sentence
|
|
|
|
|
if (sentence == null) return queryhashes;
|
|
|
|
|
@ -756,7 +843,7 @@ public class plasmaSnippetCache {
|
|
|
|
|
}
|
|
|
|
|
public void run() {
|
|
|
|
|
log.logFine("snippetFetcher: try to get URL " + url);
|
|
|
|
|
plasmaSnippetCache.Snippet snippet = retrieveSnippet(url, queryhashes, true, pre, 260, timeout);
|
|
|
|
|
plasmaSnippetCache.TextSnippet snippet = retrieveTextSnippet(url, queryhashes, true, pre, 260, timeout);
|
|
|
|
|
if (snippet.line == null)
|
|
|
|
|
log.logFine("snippetFetcher: cannot get URL " + url + ". error(" + snippet.source + "): " + snippet.error);
|
|
|
|
|
else
|
|
|
|
|
@ -764,4 +851,4 @@ public class plasmaSnippetCache {
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
}
|
|
|
|
|
}
|
orbiter
19 years ago