tapestry-core/src/main/java/org/apache/tapestry5/internal/services/ContextAssetFactory.java

// Copyright 2006, 2007, 2008 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.tapestry5.internal.services;

import org.apache.tapestry5.Asset;
import org.apache.tapestry5.ioc.Resource;
import org.apache.tapestry5.services.AssetFactory;
import org.apache.tapestry5.services.Context;
import org.apache.tapestry5.services.Request;

/**
 * Implementation of {@link AssetFactory} for assets that are part of the web application context.
 *
 * @see ContextResource
 */
public class ContextAssetFactory implements AssetFactory
{
    private final Request request;

    private final Context context;

    private final RequestPathOptimizer optimizer;

    public ContextAssetFactory(Request request, Context context, RequestPathOptimizer optimizer)
    {
        this.request = request;
        this.context = context;
        this.optimizer = optimizer;
    }

    public Asset createAsset(final Resource resource)
    {
        final String contextPath = request.getContextPath() + "/" + resource.getPath();

        return new Asset()
        {
            public Resource getResource()
            {
                return resource;
            }

            public String toClientURL()
            {
                return optimizer.optimizePath(contextPath);
            }

            /**
             * Returns the client URL, which is essiential to allow informal parameters of type
             * Asset to generate a proper value.
             */
            @Override
            public String toString()
            {
                return toClientURL();
            }
        };
    }

    /**
     * Returns the root {@link ContextResource}.
     */
    public Resource getRootResource()
    {
        return new ContextResource(context, "/");
    }

}