tapestry/tapestry-framework/src/java/org/apache/tapestry/asset/DefaultAssetFactory.java

// Copyright 2005 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.tapestry.asset;

import org.apache.hivemind.Location;
import org.apache.hivemind.Resource;
import org.apache.tapestry.IAsset;
import org.apache.tapestry.spec.IComponentSpecification;

import java.net.URL;
import java.net.URLConnection;
import java.util.Locale;

/**
 * Default asset factory used when the asset path contains a prefix that is not recognized. It is
 * assumed that the prefix is, in fact, the scheme of an external URL.
 * 
 * @author Howard M. Lewis Ship
 * @since 4.0
 */
public class DefaultAssetFactory implements AssetFactory
{

    public boolean assetExists(IComponentSpecification spec, Resource baseResource, String path, Locale locale)
    {
        try {
            URL url = new URL(path);

            URLConnection conn = url.openConnection();

            return true;
        } catch (Throwable t) {

            return false;
        }
    }

    public IAsset createAsset(Resource baseResource, IComponentSpecification spec, String path, Locale locale, Location location)
    {
        return new ExternalAsset(path, location);
    }

    public IAsset createAsset(Resource resource, Location location)
    {
        return new ExternalAsset(resource.getPath(), location);
    }

    public IAsset createAbsoluteAsset(String path, Locale locale, Location location)
    {
        return new ExternalAsset(path, location);
    }

}