AstValue.java

/*
 * 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.
 */

/* Generated By:JJTree: Do not edit this line. AstValue.java */

package org.jboss.el.parser;

import javax.el.ELException;
import javax.el.MethodInfo;
import javax.el.PropertyNotFoundException;

import org.jboss.el.lang.EvaluationContext;
import org.jboss.el.util.MessageFactory;



/**
 * @author Jacob Hookom [jacob@hookom.net]
 * @version $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: markt $
 */
@SuppressWarnings("rawtypes")
public final class AstValue extends SimpleNode {
	
	protected static class Target {
		protected Object base;
		protected ValueSuffixNode node;
	}
	
	public AstValue(int id) {
		super(id);
	}
	
	public Class getType(EvaluationContext ctx) throws ELException {
		Target t = getTarget(ctx);
		return t.node.getType(t.base, ctx);
	}
	
	private final Target getTarget(EvaluationContext ctx) throws ELException {
		// evaluate expr-a to value-a
		Object base = this.children[0].getValue(ctx);
		
		// if our base is null (we know there are more properites to evaluate)
		if (base == null) {
			throw new PropertyNotFoundException(MessageFactory.get(
					"error.unreachable.base", this.children[0].getImage()));
		}
		
		// set up our start/end
		int propCount = this.jjtGetNumChildren() - 1;
		int i = 1;
		
		while (base != null && i < propCount) {
			base = ((ValueSuffixNode) this.children[i]).getTarget(base, ctx);
			i++;
			
			if (base == null) {
				throw new PropertyNotFoundException(MessageFactory.get(
						"error.unreachable.base", this.children[0].getImage()));
			}
		}
		
		Target t = new Target();
		t.base = base;
		t.node = (ValueSuffixNode) this.children[propCount];
		return t;
	}
	
	public Object getValue(EvaluationContext ctx) throws ELException {
		Object base = this.children[0].getValue(ctx);
		int propCount = this.jjtGetNumChildren();
		int i = 1;
		while (base != null && i < propCount) {
			base = ((ValueSuffixNode) this.children[i]).getValue(base, ctx);
			if (base == null) {
				return base;
			}
			i++;
		}
		return base;
	}
	
	public boolean isReadOnly(EvaluationContext ctx) throws ELException {
		Target t = getTarget(ctx);
		return t.node.isReadOnly(t.base, ctx);
	}
	
	public void setValue(EvaluationContext ctx, Object value)
	throws ELException {
		Target t = getTarget(ctx);
		t.node.setValue(t.base, ctx, value);
	}
	
	public MethodInfo getMethodInfo(EvaluationContext ctx, Class[] paramTypes)
	throws ELException {
		Target t = getTarget(ctx);
		return t.node.getMethodInfo(t.base, ctx, paramTypes);
	}
	
	public Object invoke(EvaluationContext ctx, Class[] paramTypes,
			Object[] paramValues) throws ELException {
		Target t = getTarget(ctx);
		return t.node.invoke(t.base, ctx, paramTypes, paramValues);
	}
}