org.onebusaway.presentation.impl.resources.DataResourceImpl.java Source code

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Here is the source code for org.onebusaway.presentation.impl.resources.DataResourceImpl.java

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/**
 * Copyright (C) 2011 Brian Ferris <bdferris@onebusaway.org>
 *
 * 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.onebusaway.presentation.impl.resources;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

import com.google.gwt.resources.client.ImageResource;
import com.google.gwt.safehtml.shared.SafeUri;

public class DataResourceImpl extends ResourcePrototypeImpl
        implements ImageResource, ResourceWithUrl, LocalResource {

    private String _url;

    public DataResourceImpl(ClientBundleContext context, ClientBundleImpl parentBundle, String name, URL localUrl) {
        super(context, parentBundle, name);
        _localUrl = localUrl;
    }

    public String getUrl() {

        if (_url == null)
            refresh();

        return _url;
    }

    @Override
    protected void refresh() {
        super.refresh();

        try {

            InputStream is = _localUrl.openStream();
            String key = ResourceSupport.getHash(is);
            is.close();

            String extension = getExtension();

            _url = constructURL(key, extension, this);

        } catch (IOException ex) {
            throw new IllegalStateException(ex);
        }
    }

    @Override
    public int getHeight() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public int getLeft() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public int getTop() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public String getURL() {
        return getUrl();
    }

    @Override
    public int getWidth() {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public boolean isAnimated() {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public SafeUri getSafeUri() {
        // TODO Auto-generated method stub
        return null;
    }

    /*****************************************************************************
     * Private Methods
     ****************************************************************************/

    private String getExtension() {
        String path = _localUrl.getPath();
        int index = path.lastIndexOf('.');
        if (index != -1)
            return path.substring(index + 1);
        return "";
    }
}