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/*
 * Copyright 2002-2006 the original author or authors.
 * 
 * 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.springframework.binding.expression;

import org.springframework.core.NestedRuntimeException;

/**
 * Base class for exceptions thrown by expression parsing system.
 * @author Keith Donald
 */
public class ParserException extends NestedRuntimeException {

	/**
	 * The expression string that could not be parsed.
	 */
	private String expressionString;

	/**
	 * Creates a new parser exception.
	 * @param expressionString
	 * @param cause
	 */
	public ParserException(String expressionString, Throwable cause) {
		this(expressionString, cause, "Unable to parse expression string '" + expressionString + "'");
	}

	/**
	 * Creates a new parser exception.
	 * @param expressionString
	 * @param cause
	 * @param message
	 */
	public ParserException(String expressionString, Throwable cause, String message) {
		super(message, cause);
		this.expressionString = expressionString;
	}

	/**
	 * Returns the expression string that could not be parsed.
	 */
	public Object getExpressionString() {
		return expressionString;
	}
}