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/*
 * Based on JUEL 2.2.1 code, 2006-2009 Odysseus Software GmbH
 *
 * 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.activiti.engine.impl.juel;

import org.activiti.engine.impl.javax.el.ELContext;


public abstract class AstNode implements ExpressionNode {
	/**
	 * evaluate and return the (optionally coerced) result.
	 */
	public final Object getValue(Bindings bindings, ELContext context, Class type) {
		Object value = eval(bindings, context);
		if (type != null) {
			value = bindings.convert(value, type);
		}
		return value;
	}

	public abstract void appendStructure(StringBuilder builder, Bindings bindings);

	public abstract Object eval(Bindings bindings, ELContext context);
  
	public final String getStructuralId(Bindings bindings) {
		StringBuilder builder = new StringBuilder();
		appendStructure(builder, bindings);
		return builder.toString();
	}
}