nl.trivento.albero.model.ValuesNode Maven / Gradle / Ivy

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/* Copyright 2011-2012 Profict Holding 
*
* 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 nl.trivento.albero.model;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import nl.trivento.albero.model.forms.Form;

/**
 * A node that sets a number of context variables (of type {@value Context#INFORMATION}) when it is evaluated. It does
 * not result in a form.
 *
 */
public class ValuesNode extends AbstractNode {
	private Map values;

	/**
	 * Creates a values node.
	 *
	 * @param code the node code
	 * @param group the node group
	 * @param values the values that should be set when the node is evaluated
	 */
	public ValuesNode(String code, String group, Map values) {
		super(code, group);

		this.values = new HashMap(values);
	}

	@Override
	public boolean isEvaluatable(Context context) {
		return super.isEvaluatable(context) && !valuesAvailable(context);
	}

	private boolean valuesAvailable(Context context) {
		boolean available = context.getVariableTypes().contains(Context.INFORMATION);

		Iterator it = values.keySet().iterator();

		while (available && it.hasNext()) {
			available = context.getVariableNames(Context.INFORMATION).contains(it.next());
		}

		return available;
	}

	public Form evaluate(EvaluationContext evaluationContext, boolean validate) {
		Context context = evaluationContext.getContext();

		for (String name: values.keySet()) {
			context.setVariable(Context.INFORMATION, name, values.get(name));
		}

		return null;
	}
}