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Tomcat example source code file (DirContextURLConnection.java)
The Tomcat DirContextURLConnection.java source code/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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.apache.naming.resources; import java.net.URL; import java.net.URLConnection; import java.io.IOException; import java.io.InputStream; import java.io.FileNotFoundException; import java.security.Permission; import java.util.Date; import java.util.Enumeration; import java.util.Vector; import javax.naming.NamingException; import javax.naming.NamingEnumeration; import javax.naming.NameClassPair; import javax.naming.directory.DirContext; import javax.naming.directory.Attribute; import javax.naming.directory.Attributes; import org.apache.naming.JndiPermission; import org.apache.naming.resources.Resource; import org.apache.naming.resources.ResourceAttributes; /** * Connection to a JNDI directory context. * <p/> * Note: All the object attribute names are the WebDAV names, not the HTTP * names, so this class overrides some methods from URLConnection to do the * queries using the right names. Content handler is also not used; the * content is directly returned. * * @author <a href="mailto:remm@apache.org">Remy Maucherat * @version $Revision: 505593 $ */ public class DirContextURLConnection extends URLConnection { // ----------------------------------------------------------- Constructors public DirContextURLConnection(DirContext context, URL url) { super(url); if (context == null) throw new IllegalArgumentException ("Directory context can't be null"); if (org.apache.naming.Constants.IS_SECURITY_ENABLED) { this.permission = new JndiPermission(url.toString()); } this.context = context; } // ----------------------------------------------------- Instance Variables /** * Directory context. */ protected DirContext context; /** * Associated resource. */ protected Resource resource; /** * Associated DirContext. */ protected DirContext collection; /** * Other unknown object. */ protected Object object; /** * Attributes. */ protected Attributes attributes; /** * Date. */ protected long date; /** * Permission */ protected Permission permission; // ------------------------------------------------------------- Properties /** * Connect to the DirContext, and retrive the bound object, as well as * its attributes. If no object is bound with the name specified in the * URL, then an IOException is thrown. * * @throws IOException Object not found */ public void connect() throws IOException { if (!connected) { try { date = System.currentTimeMillis(); String path = getURL().getFile(); if (context instanceof ProxyDirContext) { ProxyDirContext proxyDirContext = (ProxyDirContext) context; String hostName = proxyDirContext.getHostName(); String contextName = proxyDirContext.getContextName(); if (hostName != null) { if (!path.startsWith("/" + hostName + "/")) return; path = path.substring(hostName.length()+ 1); } if (contextName != null) { if (!path.startsWith(contextName + "/")) { return; } else { path = path.substring(contextName.length()); } } } object = context.lookup(path); attributes = context.getAttributes(path); if (object instanceof Resource) resource = (Resource) object; if (object instanceof DirContext) collection = (DirContext) object; } catch (NamingException e) { // Object not found } connected = true; } } /** * Return the content length value. */ public int getContentLength() { return getHeaderFieldInt(ResourceAttributes.CONTENT_LENGTH, -1); } /** * Return the content type value. */ public String getContentType() { return getHeaderField(ResourceAttributes.CONTENT_TYPE); } /** * Return the last modified date. */ public long getDate() { return date; } /** * Return the last modified date. */ public long getLastModified() { if (!connected) { // Try to connect (silently) try { connect(); } catch (IOException e) { } } if (attributes == null) return 0; Attribute lastModified = attributes.get(ResourceAttributes.LAST_MODIFIED); if (lastModified != null) { try { Date lmDate = (Date) lastModified.get(); return lmDate.getTime(); } catch (Exception e) { } } return 0; } /** * Returns the name of the specified header field. */ public String getHeaderField(String name) { if (!connected) { // Try to connect (silently) try { connect(); } catch (IOException e) { } } if (attributes == null) return (null); Attribute attribute = attributes.get(name); try { return attribute.get().toString(); } catch (Exception e) { // Shouldn't happen, unless the attribute has no value } return (null); } /** * Get object content. */ public Object getContent() throws IOException { if (!connected) connect(); if (resource != null) return getInputStream(); if (collection != null) return collection; if (object != null) return object; throw new FileNotFoundException(); } /** * Get object content. */ public Object getContent(Class[] classes) throws IOException { Object object = getContent(); for (int i = 0; i < classes.length; i++) { if (classes[i].isInstance(object)) return object; } return null; } /** * Get input stream. */ public InputStream getInputStream() throws IOException { if (!connected) connect(); if (resource == null) { throw new FileNotFoundException(); } else { // Reopen resource try { resource = (Resource) context.lookup(getURL().getFile()); } catch (NamingException e) { } } return (resource.streamContent()); } /** * Get the Permission for this URL */ public Permission getPermission() { return permission; } // --------------------------------------------------------- Public Methods /** * List children of this collection. The names given are relative to this * URI's path. The full uri of the children is then : path + "/" + name. */ public Enumeration list() throws IOException { if (!connected) { connect(); } if ((resource == null) && (collection == null)) { throw new FileNotFoundException(); } Vector result = new Vector(); if (collection != null) { try { NamingEnumeration enumeration = context.list(getURL().getFile()); while (enumeration.hasMoreElements()) { NameClassPair ncp = (NameClassPair) enumeration.nextElement(); result.addElement(ncp.getName()); } } catch (NamingException e) { // Unexpected exception throw new FileNotFoundException(); } } return result.elements(); } } Other Tomcat examples (source code examples)Here is a short list of links related to this Tomcat DirContextURLConnection.java source code file: |
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