StreamResourcePageActivity.java

/*
 * Copyright (c) 2011 PonySDK
 *  Owners:
 *  Luciano Broussal  <luciano.broussal AT gmail.com>
 *  Mathieu Barbier   <mathieu.barbier AT gmail.com>
 *  Nicolas Ciaravola <nicolas.ciaravola.pro AT gmail.com>
 *
 *  WebSite:
 *  http://code.google.com/p/pony-sdk/
 *
 * 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 com.ponysdk.sample.client.page;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import com.ponysdk.core.server.application.UIContext;
import com.ponysdk.core.ui.basic.Element;
import com.ponysdk.core.ui.basic.PButton;
import com.ponysdk.core.ui.basic.PFlowPanel;

public class StreamResourcePageActivity extends SamplePageActivity {

    public StreamResourcePageActivity() {
        super("Stream resource", "Resource management");
    }

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

        final PFlowPanel panel = Element.newPFlowPanel();

        final PButton downloadImageButton = Element.newPButton("Download Pony image");

        downloadImageButton.addClickHandler(event -> UIContext.get().stackStreamRequest((request, response, uiContext) -> {
            response.reset();
            response.setContentType("image/png");
            response.setHeader("Content-Disposition", "attachment; filename=pony_image.png");

            try {
                final OutputStream output = response.getOutputStream();
                final InputStream input = getClass().getClassLoader().getResourceAsStream("images/pony.png");

                final byte[] buff = new byte[1024];
                while (input.read(buff) != -1) {
                    output.write(buff);
                }

                output.flush();
                output.close();
            } catch (final IOException e) {
                e.printStackTrace();
            }

        }));

        panel.add(downloadImageButton);

        examplePanel.setWidget(panel);
    }
}