org.openeos.services.ui.vaadin.internal.URLResource.java Source code

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Here is the source code for org.openeos.services.ui.vaadin.internal.URLResource.java

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/**
 * Copyright 2014 Fernando Rincon Martin <frm.rincon@gmail.com>
 *
 * 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.openeos.services.ui.vaadin.internal;

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

import org.apache.commons.codec.digest.DigestUtils;

import com.vaadin.Application;
import com.vaadin.terminal.ApplicationResource;
import com.vaadin.terminal.DownloadStream;
import com.vaadin.terminal.Terminal.ErrorEvent;

public class URLResource implements ApplicationResource {

    private static final long serialVersionUID = 1078580594244762329L;

    private long cacheTime = DEFAULT_CACHETIME;
    private URL url;
    private String mimeType;
    private String fileName;
    private Application application;

    public URLResource(URL url, Application application) {
        this.url = url;
        this.application = application;
        mimeType = URLConnection.guessContentTypeFromName(url.getFile());
        fileName = DigestUtils.md5Hex(url.toString()) + url.toString().substring(url.toString().lastIndexOf("."));
        application.addResource(this);
    }

    @Override
    public String getMIMEType() {
        return mimeType;
    }

    @Override
    public DownloadStream getStream() {
        try {
            DownloadStream downloadStream = new DownloadStream(url.openStream(), getMIMEType(), getFilename());
            downloadStream.setCacheTime(getCacheTime());
            return downloadStream;
        } catch (final IOException e) {
            // Log the exception using the application error handler
            getApplication().getErrorHandler().terminalError(new ErrorEvent() {

                public Throwable getThrowable() {
                    return e;
                }

            });

            return null;
        }
    }

    @Override
    public Application getApplication() {
        return application;
    }

    @Override
    public String getFilename() {
        return fileName;
    }

    @Override
    public long getCacheTime() {
        return cacheTime;
    }

    public void setCacheTime(long cacheTime) {
        this.cacheTime = cacheTime;
    }

    @Override
    public int getBufferSize() {
        return 0;
    }

}