/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* 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.apache.cocoon.components.source.impl;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import org.apache.avalon.framework.activity.Disposable;
import org.apache.avalon.framework.activity.Initializable;
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.container.ContainerUtil;
import org.apache.avalon.framework.context.Context;
import org.apache.avalon.framework.context.ContextException;
import org.apache.avalon.framework.context.Contextualizable;
import org.apache.avalon.framework.logger.AbstractLogEnabled;
import org.apache.avalon.framework.parameters.Parameters;
import org.apache.avalon.framework.service.ServiceManager;
import org.apache.avalon.framework.service.Serviceable;
import org.apache.avalon.framework.thread.ThreadSafe;
import org.apache.cocoon.components.source.SourceDescriptor;
import org.apache.cocoon.components.source.SourceInspector;
import org.apache.cocoon.components.source.helpers.SourceProperty;
import org.apache.excalibur.source.Source;
import org.apache.excalibur.source.SourceException;
import org.apache.excalibur.source.SourceValidity;
import org.apache.excalibur.source.impl.validity.AggregatedValidity;
/**
* This source descriptor acts as container for a set of source inspectors/descriptors.
*
* @author <a href="mailto:stephan@apache.org">Stephan Michels</a>
* @author <a href="mailto:unico@apache.org">Unico Hommes</a>
* @version CVS $Id: SourceDescriptorManager.java,v 1.8 2004/03/05 13:02:21 bdelacretaz Exp $
*/
public final class SourceDescriptorManager extends AbstractLogEnabled
implements SourceDescriptor, Contextualizable, Serviceable,
Configurable, Initializable, Disposable, ThreadSafe {
// the registered inspectors
private Set m_inspectors;
private Context m_context;
private ServiceManager m_manager;
private Configuration m_configuration;
// ---------------------------------------------------- lifecycle
public SourceDescriptorManager() {
}
public void contextualize(Context context) throws ContextException {
m_context = context;
}
public void service(ServiceManager manager) {
m_manager = manager;
}
public void configure(Configuration configuration) throws ConfigurationException {
m_configuration = configuration;
}
public void initialize() throws Exception {
m_inspectors = new HashSet();
final ClassLoader classloader = Thread.currentThread().getContextClassLoader();
final Configuration[] children = m_configuration.getChildren();
for (int i = 0; i < children.length; i++) {
String className = children[i].getAttribute("class","");
SourceInspector inspector;
try {
final Class inspectorClass = classloader.loadClass(className);
inspector = (SourceInspector) inspectorClass.newInstance();
} catch (InstantiationException ie) {
throw new ConfigurationException(
"Could not instantiate class "+className, ie);
} catch (ClassNotFoundException cnfe) {
throw new ConfigurationException(
"Could not load class "+className, cnfe);
} catch (IllegalAccessException iae) {
throw new ConfigurationException(
"Could not load class "+className, iae);
}
ContainerUtil.enableLogging(inspector,getLogger());
ContainerUtil.contextualize(inspector,m_context);
ContainerUtil.service(inspector,m_manager);
ContainerUtil.configure(inspector,children[i]);
ContainerUtil.parameterize(inspector,
Parameters.fromConfiguration(children[i]));
ContainerUtil.initialize(inspector);
m_inspectors.add(inspector);
}
// done with these
m_configuration = null;
m_context = null;
m_manager = null;
}
public void dispose() {
Iterator iter = m_inspectors.iterator();
while(iter.hasNext()) {
ContainerUtil.dispose(iter.next());
}
m_inspectors = null;
}
// ---------------------------------------------------- SourceDescriptor implementation
/**
* Loops over the registered inspectors until it finds the property.
*/
public SourceProperty getSourceProperty(Source source, String namespace, String name)
throws SourceException {
final Iterator inspectors = m_inspectors.iterator();
while (inspectors.hasNext()) {
SourceInspector inspector = (SourceInspector) inspectors.next();
SourceProperty property = inspector.getSourceProperty(source,namespace,name);
if (property != null) {
return property;
}
}
return null;
}
/**
* Aggregate all properties of all registered inspectors.
*/
public SourceProperty[] getSourceProperties(Source source) throws SourceException {
final Set result = new HashSet();
SourceInspector inspector;
SourceProperty[] properties;
final Iterator inspectors = m_inspectors.iterator();
while (inspectors.hasNext()) {
inspector = (SourceInspector) inspectors.next();
properties = inspector.getSourceProperties(source);
if (properties != null) {
result.addAll(Arrays.asList(properties));
}
}
return (SourceProperty[]) result.toArray(new SourceProperty[result.size()]);
}
/**
* Check if there is an inspector that handles properties of
* the given type.
*/
public boolean handlesProperty(String namespace, String name) {
SourceInspector inspector;
final Iterator inspectors = m_inspectors.iterator();
while(inspectors.hasNext()) {
inspector = (SourceInspector) inspectors.next();
if (inspector.handlesProperty(namespace,name)) {
return true;
}
}
return false;
}
/**
* Loops over the registered descriptors and delegates the call.
*/
public void removeSourceProperty(Source source, String ns, String name) throws SourceException {
SourceInspector inspector;
final Iterator inspectors = m_inspectors.iterator();
while (inspectors.hasNext()) {
inspector = (SourceInspector) inspectors.next();
if (inspector instanceof SourceDescriptor) {
((SourceDescriptor) inspector).removeSourceProperty(source,ns,name);
}
}
}
/**
* Loops over the registered descriptors and calls delegates the call.
*/
public void setSourceProperty(Source source, SourceProperty property) throws SourceException {
SourceInspector inspector;
final Iterator inspectors = m_inspectors.iterator();
while (inspectors.hasNext()) {
inspector = (SourceInspector) inspectors.next();
if (inspector instanceof SourceDescriptor) {
((SourceDescriptor) inspector).setSourceProperty(source,property);
}
}
}
/**
* Returns an aggregate validity describing the validity of all the properties.
*/
public SourceValidity getValidity(Source source) {
AggregatedValidity validity = new AggregatedValidity();
SourceInspector inspector;
final Iterator inspectors = m_inspectors.iterator();
while (inspectors.hasNext()) {
inspector = (SourceInspector) inspectors.next();
SourceValidity sv = inspector.getValidity(source);
if (sv == null) {
return null;
}
validity.add(sv);
}
return validity;
}
}