X-Git-Url: http://wamblee.org/gitweb/?a=blobdiff_plain;f=crawler%2Fbasic%2Fsrc%2Fmain%2Fjava%2Forg%2Fwamblee%2Fcrawler%2Fimpl%2FCrawlerImpl.java;fp=crawler%2Fbasic%2Fsrc%2Fmain%2Fjava%2Forg%2Fwamblee%2Fcrawler%2Fimpl%2FCrawlerImpl.java;h=098ed91f42ee30d072b2ce5d5339e37d3e8a2726;hb=62f165891f08ae532b5a794af11d7338a93f9a43;hp=0000000000000000000000000000000000000000;hpb=07cedd3f0730646ea35a7f668b3e1e872a4605d9;p=utils

diff --git a/crawler/basic/src/main/java/org/wamblee/crawler/impl/CrawlerImpl.java b/crawler/basic/src/main/java/org/wamblee/crawler/impl/CrawlerImpl.java
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+/*
+ * Copyright 2005 the original author or authors.
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.wamblee.crawler.impl;
+
+import org.apache.commons.httpclient.HttpClient;
+import org.apache.commons.httpclient.NameValuePair;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.dom4j.Element;
+import org.dom4j.io.DOMReader;
+import org.w3c.dom.Document;
+import org.wamblee.crawler.Configuration;
+import org.wamblee.crawler.Crawler;
+import org.wamblee.crawler.Page;
+import org.wamblee.crawler.PageException;
+import org.wamblee.crawler.PageRequest;
+import org.wamblee.crawler.PageType;
+
+/**
+ * Crawler implementation.
+ */
+public class CrawlerImpl implements Crawler {
+
+    private static final Log LOG = LogFactory.getLog(CrawlerImpl.class);
+
+    private HttpClient _client;
+
+    private Configuration _config;
+
+    /**
+     * Constructs the crawler.
+     * 
+     * @param aClient
+     *            Http client to use.
+     * @param aConfig
+     *            Configuration.
+     */
+    public CrawlerImpl(HttpClient aClient, Configuration aConfig) {
+        _client = aClient;
+        _config = aConfig;
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.wamblee.crawler.Crawler#getPage(java.lang.String)
+     */
+    public Page getPage(String aUrl, NameValuePair[] aParams) throws PageException {
+        LOG.debug("Getting page: url = '" + aUrl + "'");
+        PageRequest request = _config.getRequest(aUrl);
+        Document content = request.execute(aUrl, aParams, _client);
+        return transformToDom4jDoc(aUrl, content);
+    }
+
+    /*
+     * (non-Javadoc)
+     * 
+     * @see org.wamblee.crawler.Crawler#getPage(java.lang.String,
+     *      java.lang.String)
+     */
+    public Page getPage(String aUrl, NameValuePair[] aParams, PageType aType) throws PageException {
+        LOG.debug("Getting page: url = '" + aUrl + "', type = '" + aType + "'");
+        PageRequest request = _config.getRequest(aType);
+        Document content = request.execute(aUrl, aParams, _client);
+        return transformToDom4jDoc(aUrl, content);
+    }
+
+    /**
+     * Converts a w3c DOM document to a page object. 
+     * @param content DOM document. 
+     * @return
+     */
+    private Page transformToDom4jDoc(String aUrl, Document content) {
+        DOMReader reader = new DOMReader();
+        org.dom4j.Document dom4jDoc = reader.read(content);
+        Element root = dom4jDoc.getRootElement();
+        dom4jDoc.remove(root);
+
+        return new PageImpl(aUrl, this, replaceReferencesWithContent(root));
+    }
+
+    /**
+     * Perform crawling. Find references in the retrieved content and replace
+     * them by the content they refer to by retrieving the appropriate pages as
+     * well.
+     * 
+     * @param content
+     *            Content which must be made complete.
+     * @return Fully processed content.
+     */
+    private Element replaceReferencesWithContent(Element content) {
+        return content; // TODO implement.
+    }
+}