/*
* 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.wicket;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.wicket.css.ICssCompressor;
import org.apache.wicket.javascript.IJavaScriptCompressor;
import org.apache.wicket.markup.head.CssHeaderItem;
import org.apache.wicket.markup.head.CssReferenceHeaderItem;
import org.apache.wicket.markup.head.HeaderItem;
import org.apache.wicket.markup.head.IReferenceHeaderItem;
import org.apache.wicket.markup.head.JavaScriptHeaderItem;
import org.apache.wicket.markup.head.JavaScriptReferenceHeaderItem;
import org.apache.wicket.request.resource.CssResourceReference;
import org.apache.wicket.request.resource.JavaScriptResourceReference;
import org.apache.wicket.request.resource.ResourceReference;
import org.apache.wicket.request.resource.ResourceReferenceRegistry;
import org.apache.wicket.resource.bundles.ConcatResourceBundleReference;
import org.apache.wicket.util.lang.Args;
/**
* Contains all resource bundles that are registered in the application. Resource bundles provide a
* way to combine multiple resources into one, reducing the number of requests needed to load a
* page. The code using the resources does not need to know about the registered resources, making
* it possible to create resource bundles for 3rd party libraries. When a single resource from a
* resource bundle is requested, the bundle is rendered instead. All other resources from the bundle
* are marked as rendered. A specific resource can only be part of one bundle.
*
* @author papegaaij
*/
public class ResourceBundles
{
private final ResourceReferenceRegistry registry;
private final Map<HeaderItem, HeaderItem> providedResourcesToBundles;
/**
* Construct.
*
* @param registry
* the registry that keeps all referenced resources
*/
public ResourceBundles(final ResourceReferenceRegistry registry)
{
this.registry = Args.notNull(registry, "registry");
this.providedResourcesToBundles = new HashMap<HeaderItem, HeaderItem>();
}
/**
* Adds a javascript bundle that is automatically generated by concatenating the given package
* resources. If the given resources depend on each other, you should make sure that the
* resources are provided in the order they need to be concatenated. If the resources depend on
* other resources, that are not part of the bundle, the bundle will inherit these dependencies.
*
* This method is equivalent to {@link #addBundle(HeaderItem)} with a
* {@link JavaScriptHeaderItem} for a {@link ConcatResourceBundleReference}.
*
* @param scope
* The {@linkplain ResourceReference#getScope() scope} of the bundle
* @param name
* The name of the resource. This will show up as the filename in the markup.
* @param references
* The resources this bundle will consist of.
* @return the newly created bundle
*/
public JavaScriptReferenceHeaderItem addJavaScriptBundle(Class<?> scope, String name,
JavaScriptResourceReference... references)
{
List<JavaScriptReferenceHeaderItem> items = new ArrayList<JavaScriptReferenceHeaderItem>();
for (JavaScriptResourceReference curReference : references)
{
items.add(JavaScriptHeaderItem.forReference(curReference));
}
ConcatResourceBundleReference<JavaScriptReferenceHeaderItem> bundleReference =
new ConcatResourceBundleReference<JavaScriptReferenceHeaderItem>(scope, name, items);
if (Application.exists())
{
IJavaScriptCompressor javaScriptCompressor = Application.get().getResourceSettings().getJavaScriptCompressor();
bundleReference.setCompressor(javaScriptCompressor);
}
return addBundle(JavaScriptHeaderItem.forReference(bundleReference));
}
/**
* Adds a css bundle that is automatically generated by concatenating the given package
* resources. If the given resources depend on each other, you should make sure that the
* resources are provided in the order they need to be concatenated. If the resources depend on
* other resources, that are not part of the bundle, the bundle will inherit these dependencies.
*
* This method is equivalent to {@link #addBundle(HeaderItem)} with a {@link CssHeaderItem} for
* a {@link ConcatResourceBundleReference}.
*
* @param scope
* The {@linkplain ResourceReference#getScope() scope} of the bundle
* @param name
* The name of the resource. This will show up as the filename in the markup.
* @param references
* The resources this bundle will consist of.
* @return the newly created bundle
*/
public CssReferenceHeaderItem addCssBundle(Class<?> scope, String name,
CssResourceReference... references)
{
List<CssReferenceHeaderItem> items = new ArrayList<CssReferenceHeaderItem>();
for (CssResourceReference curReference : references)
{
items.add(CssHeaderItem.forReference(curReference));
}
ConcatResourceBundleReference<CssReferenceHeaderItem> bundleReference =
new ConcatResourceBundleReference<CssReferenceHeaderItem>(scope, name, items);
if (Application.exists())
{
ICssCompressor cssCompressor = Application.get().getResourceSettings().getCssCompressor();
bundleReference.setCompressor(cssCompressor);
}
return addBundle(CssHeaderItem.forReference(bundleReference));
}
/**
* Adds a bundle to the registry.
*
* @param bundle
* The bundle to register
* @return the bundle
* @throws IllegalArgumentException
* if any of the provided resources of the given bundle is already provided by a
* different bundle.
*/
public <T extends HeaderItem> T addBundle(T bundle)
{
for (HeaderItem curProvidedResource : bundle.getProvidedResources())
{
if (providedResourcesToBundles.containsKey(curProvidedResource))
{
throw new IllegalArgumentException(
"Only one bundle can provide a certain resource. " +
providedResourcesToBundles.get(curProvidedResource) +
" already provides the resource " + curProvidedResource);
}
providedResourcesToBundles.put(curProvidedResource, bundle);
}
if (bundle instanceof IReferenceHeaderItem)
{
ResourceReference reference = ((IReferenceHeaderItem) bundle).getReference();
if (reference.canBeRegistered())
{
registry.registerResourceReference(reference);
}
}
return bundle;
}
/**
* Finds a bundle that provides the given item.
*
* @param item
* The item that should be provided by the bundle.
* @return The bundle that provides the given item or null if no bundle is found.
*/
public HeaderItem findBundle(HeaderItem item)
{
return providedResourcesToBundles.get(item);
}
}