| /* |
| * 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.cocoon.components.source; |
| |
| import org.apache.avalon.framework.component.ComponentException; |
| import org.apache.avalon.framework.component.ComponentManager; |
| import org.apache.avalon.framework.component.ComponentSelector; |
| import org.apache.avalon.framework.logger.Logger; |
| import org.apache.cocoon.ProcessingException; |
| import org.apache.cocoon.environment.Environment; |
| import org.apache.cocoon.environment.Source; |
| import org.apache.cocoon.serialization.Serializer; |
| import org.xml.sax.ContentHandler; |
| import org.xml.sax.InputSource; |
| import org.xml.sax.SAXException; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * This abstract class provides convenience methods to implement |
| * a SAX based Source. Implement toSAX() and getSystemId() and |
| * optionally override getLastModified() and getContentLength() to |
| * obtain a valid Source implementation. |
| * |
| * @deprecated Use the new Avalon Excalibur Source Resolving |
| * @author <a href="mailto:gianugo@apache.org">Gianugo Rabellino</a> |
| * @version CVS $Id$ |
| */ |
| public abstract class AbstractSAXSource |
| implements Source { |
| |
| /** The Logger instance */ |
| protected Logger log; |
| |
| /** The ComponentManager instance */ |
| protected ComponentManager manager; |
| |
| /** |
| * The constructor. |
| * |
| * @param environment the Cocoon Environment. |
| * @param manager an Avalon Component Manager |
| * @param logger A LogKit logger |
| */ |
| |
| public AbstractSAXSource(Environment environment, |
| ComponentManager manager, |
| Logger logger) { |
| this.log = logger; |
| this.manager = manager; |
| |
| } |
| |
| /** |
| * Get an InputSource for the given URL. Shamelessly stolen |
| * from SitemapSource. |
| * |
| */ |
| |
| public InputStream getInputStream() |
| throws ProcessingException, IOException { |
| |
| ComponentSelector serializerSelector = null; |
| Serializer serializer = null; |
| try { |
| |
| serializerSelector = (ComponentSelector) this.manager.lookup(Serializer.ROLE + "Selector"); |
| serializer = (Serializer)serializerSelector.select("xml"); |
| ByteArrayOutputStream os = new ByteArrayOutputStream(); |
| serializer.setOutputStream(os); |
| |
| this.toSAX(serializer); |
| |
| return new ByteArrayInputStream(os.toByteArray()); |
| } catch (ComponentException cme) { |
| throw new ProcessingException("could not lookup pipeline components", cme); |
| } catch (Exception e) { |
| throw new ProcessingException("Exception during processing of " + this.getSystemId(), e); |
| } finally { |
| if (serializer != null) serializerSelector.release(serializer); |
| if (serializerSelector != null) this.manager.release(serializerSelector); |
| } |
| } |
| |
| /** |
| * Get an InputSource for the given URL. |
| * |
| */ |
| |
| public InputSource getInputSource() |
| throws ProcessingException, IOException { |
| InputSource is = new InputSource(this.getInputStream()); |
| is.setSystemId(this.getSystemId()); |
| |
| return is; |
| } |
| |
| /** |
| * Implement this method to obtain SAX events. |
| * |
| */ |
| |
| public abstract void toSAX(ContentHandler handler) |
| throws SAXException; |
| |
| /** |
| * Implement this method to set the unique identifier. |
| * |
| */ |
| |
| public abstract String getSystemId(); |
| |
| /** |
| * Override this method to set the Content Length |
| * |
| */ |
| |
| public long getContentLength() { |
| return -1; |
| } |
| |
| /** |
| * Override this method to set the Last Modification date |
| * |
| */ |
| |
| public long getLastModified() { |
| return 0; |
| } |
| } |