org.qipki.clients.web.client.ui.widgets.ExternalResourcePanel.java Source code

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Here is the source code for org.qipki.clients.web.client.ui.widgets.ExternalResourcePanel.java

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/*
 * Copyright (c) 2011, Paul Merlin. All Rights Reserved.
 *
 * 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.qipki.clients.web.client.ui.widgets;

import com.google.gwt.http.client.Request;
import com.google.gwt.http.client.RequestBuilder;
import com.google.gwt.http.client.RequestCallback;
import com.google.gwt.http.client.RequestException;
import com.google.gwt.http.client.Response;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HTMLPanel;
import com.google.gwt.user.client.ui.IsWidget;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.SimplePanel;

public class ExternalResourcePanel extends Composite {

    private SimplePanel panel = new SimplePanel();
    private String url;
    private IsWidget loadingPanel;

    public ExternalResourcePanel(String url) {
        this(url, null);
    }

    public ExternalResourcePanel(String url, IsWidget loadingPanel) {
        this.url = url;
        this.loadingPanel = loadingPanel;
        initWidget(panel);
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public void setLoadingPanel(IsWidget loadingPanel) {
        this.loadingPanel = loadingPanel;
    }

    public void load(String url) {
        load(url, null);
    }

    public void load(final String url, final RequestCallback callback) {
        RequestBuilder rb = new RequestBuilder(RequestBuilder.GET, url);
        rb.setCallback(new RequestCallback() {

            @Override
            public void onResponseReceived(final Request request, final Response response) {
                new Timer() {

                    @Override
                    public void run() {
                        panel.clear();
                        panel.add(new HTMLPanel(response.getText()));
                        ExternalResourcePanel.this.url = url;
                        callback.onResponseReceived(request, response);
                    }

                }.schedule(2000);
            }

            @Override
            public void onError(Request request, Throwable exception) {
                panel.clear();
                panel.add(new Label("Request ERROR: " + exception.getMessage()));
                callback.onError(request, exception);
            }

        });
        panel.clear();
        if (loadingPanel != null) {
            panel.setWidget(loadingPanel);
        }
        try {
            rb.send();
        } catch (RequestException ex) {
            panel.add(new Label("Request EXCEPTION: " + ex.getMessage()));
        }
    }

    public void reload() {
        load(url, null);
    }

    public void reload(RequestCallback callback) {
        load(url, callback);
    }

}