/*
* Copyright 2002-2010 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.integration.config;
import org.springframework.beans.factory.config.AbstractFactoryBean;
import org.springframework.expression.Expression;
import org.springframework.expression.ExpressionParser;
import org.springframework.expression.spel.SpelParserConfiguration;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.util.Assert;
/**
* FactoryBean for creating Expression instances.
*
* @author Mark Fisher
* @since 2.0
*/
public class ExpressionFactoryBean extends AbstractFactoryBean<Expression> {
private final static ExpressionParser DEFAULT_PARSER = new SpelExpressionParser();
private final String expressionString;
private volatile ExpressionParser parser = DEFAULT_PARSER;
public ExpressionFactoryBean(String expressionString) {
Assert.hasText(expressionString, "expressionString must not be empty or null");
this.expressionString = expressionString;
}
public void setParserConfiguration(SpelParserConfiguration parserConfiguration) {
Assert.notNull(parserConfiguration, "parserConfiguration must not be null");
this.parser = new SpelExpressionParser(parserConfiguration);
}
@Override
public Class<?> getObjectType() {
return Expression.class;
}
@Override
protected Expression createInstance() throws Exception {
return this.parser.parseExpression(this.expressionString);
}
}