| /******************************************************************************* |
| * Copyright (c) 2001, 2004 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jst.j2ee.internal.xml; |
| |
| |
| |
| import java.net.URL; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import org.eclipse.jst.j2ee.internal.J2EEConstants; |
| import org.xml.sax.InputSource; |
| |
| |
| public class J2EEXmlDtDEntityResolver implements org.xml.sax.EntityResolver { |
| |
| /** All the dtds that this resolver knows about; import strategies register these |
| * at startup */ |
| protected static Map supportedDtDs; |
| static { |
| registerDtD("http://www.w3.org/2001/xml.xsd", "xml.xsd"); //$NON-NLS-1$ //$NON-NLS-2$ |
| registerDtD("XMLSchema.dtd", "XMLSchema.dtd"); //$NON-NLS-1$ //$NON-NLS-2$ |
| registerDtD("datatypes.dtd", "datatypes.dtd"); //$NON-NLS-1$ //$NON-NLS-2$ |
| } |
| public static J2EEXmlDtDEntityResolver INSTANCE = new J2EEXmlDtDEntityResolver(); |
| /** |
| * EjbXmlEntityResolver constructor comment. |
| */ |
| public J2EEXmlDtDEntityResolver() { |
| super(); |
| } |
| public static Map getSupportedDtDs() { |
| if (supportedDtDs == null) |
| supportedDtDs = new HashMap(); |
| return supportedDtDs; |
| } |
| /** |
| * Maps the system id for the dtd to a local id to be retrieved loaded from the class path |
| */ |
| public static void registerDtD(String systemID, String localID) { |
| //Make sure local file exists on classpath first. |
| |
| ClassLoader loader = J2EEXmlDtDEntityResolver.class.getClassLoader(); |
| URL url = null; |
| if (loader == null) { |
| url = ClassLoader.getSystemResource(localID); |
| } else { |
| url = loader.getResource(localID); |
| } |
| if (url == null) { |
| return; |
| } |
| getSupportedDtDs().put(systemID, localID); |
| getSupportedDtDs().put(getShortName(systemID), localID); |
| } |
| /** |
| * for a system id with a URL that begins with "http://java.sun.com/", check to see if that is a recognized dtd; |
| * if so, load the dtd from the class path using the value of the registered dtd. |
| * |
| * @return an Input source on a locally resolved dtd, or null of the systemid does not start with "http://java.sun.com/" |
| * |
| * @throws SAXException with a nested NotSupportedException if the dtd is not recognized |
| * @throws FileNotFoundException if the resolved dtd cannot be loaded from the classpath |
| */ |
| public org.xml.sax.InputSource resolveEntity(String publicId, String systemId) throws java.io.IOException, org.xml.sax.SAXException { |
| String localResourceName = null; |
| boolean isJavaSytemId = false; |
| if (shouldBeRegistered(systemId)) { |
| localResourceName = (String)getSupportedDtDs().get(systemId); |
| isJavaSytemId = true; |
| } else { |
| String shortName = getShortName(systemId); |
| localResourceName = (String)getSupportedDtDs().get(shortName); |
| if (localResourceName != null) |
| systemId = localResourceName; |
| } |
| |
| if (localResourceName == null) { |
| return null; |
| } |
| ClassLoader loader = getClass().getClassLoader(); |
| URL url = null; |
| if (loader == null) { |
| url = ClassLoader.getSystemResource(localResourceName); |
| } else { |
| url = loader.getResource(localResourceName); |
| } |
| |
| |
| if (url == null) { |
| String message = J2EEXMLResourceHandler.getString("dtd_not_found_EXC_", (new Object[] {localResourceName}));//$NON-NLS-1$ = "Could not parse xml because the resolved resource "{0}" could not be found in classpath" |
| throw new java.io.FileNotFoundException(message); |
| } |
| |
| InputSource result = new InputSource(url.toString()); |
| result.setPublicId(publicId); |
| // force the encoding to be UTF8 |
| result.setEncoding("UTF-8"); //$NON-NLS-1$ |
| |
| return result; |
| } |
| protected boolean shouldBeRegistered(String systemId) { |
| |
| return systemId.startsWith(J2EEConstants.JAVA_SUN_COM_URL) |
| || systemId.startsWith(J2EEConstants.WWW_W3_ORG_URL) |
| || systemId.startsWith(J2EEConstants.WWW_IBM_COM_URL); |
| } |
| |
| /** |
| * Returns the filename from the uri, or the segment after the last occurrence of a separator |
| */ |
| private static String getShortName(String uri) { |
| String tempURI = uri.replace('\\', '/'); |
| while (tempURI.endsWith("/")) //$NON-NLS-1$ |
| tempURI = tempURI.substring(0, tempURI.length()-1); |
| int lastIndex = tempURI.lastIndexOf('/'); |
| if (lastIndex == -1) |
| return uri; |
| return uri.substring(lastIndex+1, tempURI.length()); |
| } |
| } |
| |
| |
| |
| |