org.wicketstuff.extjs.tree.ExtTreeDataLinkBehavior.java Source code

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Here is the source code for org.wicketstuff.extjs.tree.ExtTreeDataLinkBehavior.java

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/*
 *  Copyright 2008 Wicket-Ext
 *
 * 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.wicketstuff.extjs.tree;

import java.util.Iterator;

import org.apache.wicket.Application;
import org.apache.wicket.IRequestTarget;
import org.apache.wicket.Request;
import org.apache.wicket.RequestCycle;
import org.apache.wicket.behavior.AbstractAjaxBehavior;
import org.apache.wicket.protocol.http.WebResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Behavior providing data to ExtTreePanel
 *
 * @author Paolo Di Tommaso
 *
 */
public class ExtTreeDataLinkBehavior extends AbstractAjaxBehavior {

    private static final long serialVersionUID = 1L;
    private static final Logger log = LoggerFactory.getLogger(ExtTreeDataLinkBehavior.class);

    private ExtAsyncTreePanel provider;
    private static final String QUERY_PARAM = "node";

    public ExtTreeDataLinkBehavior(ExtAsyncTreePanel dataSource) {
        provider = dataSource;
    }

    public void onRequest() {
        Request request = getComponent().getRequestCycle().getRequest();
        final String input = request.getParameter(QUERY_PARAM);
        if (log.isDebugEnabled()) {
            log.debug("Store request input: '{}'", input);
        }

        IRequestTarget target = new IRequestTarget() {

            public void respond(RequestCycle requestCycle) {
                WebResponse webResponse = (WebResponse) requestCycle.getResponse();

                // Determine encoding
                final String encoding = Application.get().getRequestCycleSettings().getResponseRequestEncoding();
                webResponse.setCharacterEncoding(encoding);
                webResponse.setContentType("text/plain; charset=" + encoding);

                // Make sure it is not cached by a
                webResponse.setHeader("Expires", "Mon, 26 Jul 1997 05:00:00 GMT");
                webResponse.setHeader("Cache-Control", "no-cache, must-revalidate");
                webResponse.setHeader("Pragma", "no-cache");
                ExtTreeNode expandedNode = provider.findNode(input);
                Iterator<ExtTreeNode> choices = provider.iterator(expandedNode);

                webResponse.write("[");
                while (choices.hasNext()) {
                    final ExtTreeNode item = choices.next();
                    expandedNode.appendChild(item);
                    webResponse.write(item.toString());
                    if (choices.hasNext())
                        webResponse.write(",");
                }
                webResponse.write("]");
            }

            public void detach(RequestCycle requestCycle) {
            }
        };
        getComponent().getRequestCycle().setRequestTarget(target);
    }
}