/*
* 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.forms.binding.library;
import org.apache.avalon.framework.activity.Disposable;
import org.apache.avalon.framework.component.Component;
import org.apache.avalon.framework.configuration.Configurable;
import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.avalon.framework.logger.AbstractLogEnabled;
import org.apache.avalon.framework.service.ServiceException;
import org.apache.avalon.framework.service.ServiceManager;
import org.apache.avalon.framework.service.Serviceable;
import org.apache.avalon.framework.thread.ThreadSafe;
import org.apache.excalibur.source.Source;
import org.apache.excalibur.source.SourceResolver;
import org.apache.cocoon.forms.CacheManager;
import org.apache.cocoon.forms.binding.JXPathBindingManager;
import org.apache.cocoon.forms.util.DomHelper;
import org.apache.cocoon.util.location.LocationImpl;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;
/**
* @version $Id$
*/
public class LibraryManagerImpl extends AbstractLogEnabled
implements LibraryManager, Serviceable, Configurable,
Disposable, ThreadSafe, Component {
protected static final String PREFIX = "CocoonFormBindingLibrary:";
private ServiceManager manager;
private CacheManager cacheManager;
private JXPathBindingManager bindingManager;
public void configure(Configuration configuration) throws ConfigurationException {
// TODO Read config to "preload" libraries
}
public void service(ServiceManager serviceManager) throws ServiceException {
this.manager = serviceManager;
this.cacheManager = (CacheManager)serviceManager.lookup(CacheManager.ROLE);
}
public void setBindingManager(JXPathBindingManager bindingManager) {
this.bindingManager = bindingManager;
}
public Library get(String sourceURI) throws LibraryException {
return get(sourceURI, null);
}
public Library get(String sourceURI, String baseURI) throws LibraryException {
SourceResolver sourceResolver = null;
Source source = null;
try {
try {
sourceResolver = (SourceResolver) manager.lookup(SourceResolver.ROLE);
source = sourceResolver.resolveURI(sourceURI, baseURI, null);
} catch (Exception e) {
throw new LibraryException("Unable to resolve library.",
e, new LocationImpl("[LibraryManager]", sourceURI));
}
Library lib = (Library) this.cacheManager.get(source, PREFIX);
if (lib != null && lib.dependenciesHaveChanged()) {
if (getLogger().isDebugEnabled()) {
getLogger().debug("Library IS REMOVED from cache: '" + sourceURI + "' relative to '" + baseURI + "'");
}
this.cacheManager.remove(source, PREFIX); // evict?
return null;
}
if (getLogger().isDebugEnabled()) {
if (lib != null) {
getLogger().debug("Library IS in cache: '" + sourceURI + "' relative to '" + baseURI + "'");
} else {
getLogger().debug("Library IS NOT in cache: '" + sourceURI + "' relative to '" + baseURI + "'");
}
}
return lib;
} finally {
if (source != null) {
sourceResolver.release(source);
}
if (sourceResolver != null) {
manager.release(sourceResolver);
}
}
}
public Library load(String sourceURI) throws LibraryException {
return load(sourceURI, null);
}
public Library load(String sourceURI, String baseURI) throws LibraryException {
SourceResolver sourceResolver = null;
Source source = null;
if (getLogger().isDebugEnabled()) {
getLogger().debug("Loading library: '" + sourceURI + "' relative to '" + baseURI + "'");
}
try {
try {
sourceResolver = (SourceResolver) manager.lookup(SourceResolver.ROLE);
source = sourceResolver.resolveURI(sourceURI, baseURI, null);
} catch (Exception e) {
throw new LibraryException("Unable to resolve library.",
e, new LocationImpl("[LibraryManager]", sourceURI));
}
Library lib = (Library) this.cacheManager.get(source, PREFIX);
if (lib != null && lib.dependenciesHaveChanged()) {
if (getLogger().isDebugEnabled()) {
getLogger().debug("Library IS EXPIRED in cache: '" + sourceURI + "' relative to '" + baseURI + "'");
}
lib = null;
}
if (lib == null) {
if (getLogger().isDebugEnabled()) {
getLogger().debug("Library IS NOT in cache, loading: '" + sourceURI + "' relative to '" + baseURI + "'");
}
try {
InputSource inputSource = new InputSource(source.getInputStream());
inputSource.setSystemId(source.getURI());
Document doc = DomHelper.parse(inputSource, this.manager);
lib = newLibrary();
lib.buildLibrary(doc.getDocumentElement());
this.cacheManager.set(lib,source,PREFIX);
} catch (Exception e) {
throw new LibraryException("Unable to load library.",
e, new LocationImpl("[LibraryManager]", source.getURI()));
}
}
return lib;
} finally {
if (source != null) {
sourceResolver.release(source);
}
if (sourceResolver != null) {
manager.release(sourceResolver);
}
}
}
public Library newLibrary() {
Library lib = new Library(this, bindingManager.getBuilderAssistant());
lib.enableLogging(getLogger());
if (getLogger().isDebugEnabled()) {
getLogger().debug("Created new library! " + lib);
}
return lib;
}
public void dispose() {
this.manager.release(this.cacheManager);
this.cacheManager = null;
this.manager = null;
}
public void debug(String msg) {
if(getLogger().isDebugEnabled()) {
getLogger().debug(msg);
}
}
}