org.apache.cocoon.ajax.AjaxRequestSelector.java Source code

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Here is the source code for org.apache.cocoon.ajax.AjaxRequestSelector.java

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/*
 * Copyright 1999-2005 The Apache Software Foundation.
 *
 * 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.apache.cocoon.ajax;

import java.util.Map;

import org.apache.avalon.framework.parameters.Parameters;
import org.apache.avalon.framework.thread.ThreadSafe;
import org.apache.cocoon.environment.ObjectModelHelper;
import org.apache.cocoon.environment.Request;
import org.apache.cocoon.selection.AbstractSwitchSelector;
import org.apache.commons.lang.BooleanUtils;

/**
 * Choose a select branch depending on if the current request is an Ajax request.
 * The test value can be either "<code>true</code>" or "<code>false</code>".
 * 
 * <pre>
 *   &lt;map:select type="ajax-request"&gt;
 *     &lt;map:when test="true"&gt;
 *       ... ajax request ...
 *     &lt;/map:when&gt;
 *     &lt;map:otherwise&gt;
 *       ... non ajax request ...
 *     &lt;/map:otherwise&gt;
 *   &lt;/map:select&gt;
 * </pre>
 * 
 * @since 2.1.8
 * @version $Id: AjaxRequestSelector.java 292158 2005-09-28 10:24:51Z sylvain $
 */
public class AjaxRequestSelector extends AbstractSwitchSelector implements ThreadSafe {

    public Object getSelectorContext(Map objectModel, Parameters parameters) {
        Request req = ObjectModelHelper.getRequest(objectModel);
        return BooleanUtils.toBooleanObject(AjaxHelper.isAjaxRequest(req));
    }

    public boolean select(String expression, Object selectorContext) {
        boolean test = BooleanUtils.toBoolean(expression);

        return test == ((Boolean) selectorContext).booleanValue();
    }
}