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App55 client library for the Java platform.

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/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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 com.googlecode.openbeans;

import org.apache.harmony.beans.BeansUtils;

public class Expression extends Statement
{

	boolean	valueIsDefined	= false;

	Object	value;

	public Expression(Object value, Object target, String methodName, Object[] arguments)
	{
		super(target, methodName, arguments);
		this.value = value;
		this.valueIsDefined = true;
	}

	public Expression(Object target, String methodName, Object[] arguments)
	{
		super(target, methodName, arguments);
		this.value = null;
		this.valueIsDefined = false;
	}

	@Override
	public String toString()
	{
		StringBuilder sb = new StringBuilder();
		if (!valueIsDefined)
		{
			sb.append(""); //$NON-NLS-1$
		}
		else
		{
			if (value == null)
			{
				sb.append(BeansUtils.NULL);
			}
			else
			{
				Class clazz = value.getClass();
				sb.append(clazz == String.class ? BeansUtils.QUOTE : BeansUtils.idOfClass(clazz));
			}
		}
		sb.append('=');
		sb.append(super.toString());
		return sb.toString();
	}

	public void setValue(Object value)
	{
		this.value = value;
		this.valueIsDefined = true;
	}

	public Object getValue() throws Exception
	{
		if (!valueIsDefined)
		{
			value = invokeMethod();
			valueIsDefined = true;
		}
		return value;
	}
}