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Spring Expression Language (SpEL)
/*
* Copyright 2002-2016 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.expression;
/**
* Super class for exceptions that can occur whilst processing expressions.
*
* @author Andy Clement
* @author Phil Webb
* @since 3.0
*/
@SuppressWarnings("serial")
public class ExpressionException extends RuntimeException {
protected String expressionString;
protected int position; // -1 if not known; should be known in all reasonable cases
/**
* Construct a new expression exception.
* @param message a descriptive message
*/
public ExpressionException(String message) {
super(message);
}
/**
* Construct a new expression exception.
* @param message a descriptive message
* @param cause the underlying cause of this exception
*/
public ExpressionException(String message, Throwable cause) {
super(message, cause);
}
/**
* Construct a new expression exception.
* @param expressionString the expression string
* @param message a descriptive message
*/
public ExpressionException(String expressionString, String message) {
super(message);
this.expressionString = expressionString;
this.position = -1;
}
/**
* Construct a new expression exception.
* @param expressionString the expression string
* @param position the position in the expression string where the problem occurred
* @param message a descriptive message
*/
public ExpressionException(String expressionString, int position, String message) {
super(message);
this.expressionString = expressionString;
this.position = position;
}
/**
* Construct a new expression exception.
* @param position the position in the expression string where the problem occurred
* @param message a descriptive message
*/
public ExpressionException(int position, String message) {
super(message);
this.position = position;
}
/**
* Construct a new expression exception.
* @param position the position in the expression string where the problem occurred
* @param message a descriptive message
* @param cause the underlying cause of this exception
*/
public ExpressionException(int position, String message, Throwable cause) {
super(message, cause);
this.position = position;
}
/**
* Return the expression string.
*/
public final String getExpressionString() {
return this.expressionString;
}
/**
* Return the position in the expression string where the problem occurred.
*/
public final int getPosition() {
return this.position;
}
/**
* Return the exception message.
* As of Spring 4.0, this method returns the same result as {@link #toDetailedString()}.
* @see #getSimpleMessage()
* @see java.lang.Throwable#getMessage()
*/
@Override
public String getMessage() {
return toDetailedString();
}
/**
* Return a detailed description of this exception, including the expression
* String and position (if available) as well as the actual exception message.
*/
public String toDetailedString() {
if (this.expressionString != null) {
StringBuilder output = new StringBuilder();
output.append("Expression [");
output.append(this.expressionString);
output.append("]");
if (this.position >= 0) {
output.append(" @");
output.append(this.position);
}
output.append(": ");
output.append(getSimpleMessage());
return output.toString();
}
else {
return getSimpleMessage();
}
}
/**
* Return the exception simple message without including the expression
* that caused the failure.
* @since 4.0
*/
public String getSimpleMessage() {
return super.getMessage();
}
}