MultiSelectionTriggerdDependencyRule.java

/**
* OLAT - Online Learning and Training<br>
* http://www.olat.org
* <p>
* Licensed under the Apache License, Version 2.0 (the "License"); <br>
* you may not use this file except in compliance with the License.<br>
* You may obtain a copy of the License at
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* Unless required by applicable law or agreed to in writing,<br>
* software distributed under the License is distributed on an "AS IS" BASIS, <br>
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. <br>
* See the License for the specific language governing permissions and <br>
* limitations under the License.
* <p>
* Copyright (c) since 2004 at Multimedia- & E-Learning Services (MELS),<br>
* University of Zurich, Switzerland.
* <hr>
* <a href="http://www.openolat.org">
* OpenOLAT - Online Learning and Training</a><br>
* This file has been modified by the OpenOLAT community. Changes are licensed
* under the Apache 2.0 license as the original file.  
* <p>
*/
package org.olat.core.gui.components.form.flexible.impl.rules;

import java.util.Collection;
import java.util.Set;

import org.olat.core.gui.components.form.flexible.FormItem;
import org.olat.core.gui.components.form.flexible.FormItemDependencyRule;
import org.olat.core.gui.components.form.flexible.elements.MultipleSelectionElement;

/**
 * Description:<br>
 * TODO: patrickb Class Description for MultiSelectionTriggerdDependencyRule
 * 
 * <P>
 * Initial Date:  11.02.2007 <br>
 * @author patrickb
 */
class MultiSelectionTriggerdDependencyRule extends FormItemDependencyRuleImpl implements FormItemDependencyRule {

	public MultiSelectionTriggerdDependencyRule(MultipleSelectionElement triggerElement, String triggerValue, Set<FormItem> targets, int type) {
		super(triggerElement, triggerValue, targets, type);
	}

	/**
	 * @see org.olat.core.gui.components.form.flexible.rules.FormItemDependencyRuleImpl#doesTrigger()
	 */
	@Override
	protected boolean doesTrigger() {
		MultipleSelectionElement mse = (MultipleSelectionElement)triggerElement;
		Collection<String> selectedKeys = mse.getSelectedKeys();

		boolean retval = false;
		if(triggerVal == null){
			//meaning no selection in a multi selection element
			retval = selectedKeys.isEmpty();
		} else {
			//check that value is in selection
			retval = selectedKeys.contains(triggerVal);
		}
		return retval;
	}
}