/*
* 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.sling.servlets.resolver.internal;
import java.lang.ref.WeakReference;
import java.util.Iterator;
import javax.servlet.Servlet;
import org.apache.sling.api.resource.AbstractResource;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.resource.ResourceMetadata;
import org.apache.sling.api.resource.ResourceResolver;
/**
* ScriptResource is a resource wrapper of a resource fetched by a
* per thread resource resolver.
* As the script engines usually keep a reference to this resource
* for a longer time, the resource switches internally to
* a resource fetched by the shared resource resolver.
*
* We can't extend ResourceWrapper as its not possible to clear
* the wrapped resource field.
*/
public class ScriptResource extends AbstractResource {
private Resource activeResource;
private final ResourceResolver sharedResourceResolver;
private WeakReference<ResourceResolver> perThreadResourceResolver;
public ScriptResource(final Resource resource, final ResourceResolver sharedResourceResolver) {
this.perThreadResourceResolver = new WeakReference<ResourceResolver>(resource.getResourceResolver());
this.sharedResourceResolver = sharedResourceResolver;
this.activeResource = resource;
}
private Resource getActiveResource() {
if ( this.perThreadResourceResolver != null ) {
final ResourceResolver rr = this.perThreadResourceResolver.get();
if ( rr == null || !rr.isLive() ) {
this.perThreadResourceResolver = null;
this.activeResource = this.sharedResourceResolver.getResource(this.activeResource.getPath());
}
}
return this.activeResource;
}
/**
* @see org.apache.sling.api.resource.Resource#getResourceType()
*/
public String getResourceType() {
return this.getActiveResource().getResourceType();
}
/**
* @see org.apache.sling.api.resource.Resource#getResourceSuperType()
*/
public String getResourceSuperType() {
return this.getActiveResource().getResourceSuperType();
}
/**
* @see org.apache.sling.api.resource.Resource#getResourceResolver()
*/
public ResourceResolver getResourceResolver() {
return this.getActiveResource().getResourceResolver();
}
/**
* @see org.apache.sling.api.adapter.SlingAdaptable#adaptTo(java.lang.Class)
*/
@SuppressWarnings("unchecked")
@Override
public <AdapterType> AdapterType adaptTo(final Class<AdapterType> type) {
if ( type == Servlet.class ) {
final Servlet s = (Servlet)super.adaptTo(type);
if ( s != null ) {
return (AdapterType)s;
}
}
return this.getActiveResource().adaptTo(type);
}
/**
* @see org.apache.sling.api.resource.Resource#getPath()
*/
public String getPath() {
return this.getActiveResource().getPath();
}
/**
* @see org.apache.sling.api.resource.Resource#getResourceMetadata()
*/
public ResourceMetadata getResourceMetadata() {
return this.getActiveResource().getResourceMetadata();
}
/**
* @see org.apache.sling.api.resource.AbstractResource#getName()
*/
@Override
public String getName() {
return this.getActiveResource().getName();
}
/**
* @see org.apache.sling.api.resource.AbstractResource#getParent()
*/
@Override
public Resource getParent() {
return this.getActiveResource().getParent();
}
/**
* @see org.apache.sling.api.resource.AbstractResource#getChild(java.lang.String)
*/
@Override
public Resource getChild(String relPath) {
return this.getActiveResource().getChild(relPath);
}
/**
* @see org.apache.sling.api.resource.AbstractResource#listChildren()
*/
@Override
public Iterator<Resource> listChildren() {
return this.getActiveResource().listChildren();
}
/**
* @see org.apache.sling.api.resource.AbstractResource#getChildren()
*/
@Override
public Iterable<Resource> getChildren() {
return this.getActiveResource().getChildren();
}
/**
* @see org.apache.sling.api.resource.AbstractResource#isResourceType(java.lang.String)
*/
@Override
public boolean isResourceType(String resourceType) {
return this.getActiveResource().isResourceType(resourceType);
}
}