org.springframework.integration.config.ExpressionFactoryBean.java Source code

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Here is the source code for org.springframework.integration.config.ExpressionFactoryBean.java

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/*
 * Copyright 2002-2019 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
 *
 *      https://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
 * @author Artem Bilan
 *
 * @since 2.0
 */
public class ExpressionFactoryBean extends AbstractFactoryBean<Expression> {

    private static final ExpressionParser DEFAULT_PARSER = new SpelExpressionParser();

    private final String expressionString;

    private 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() {
        return this.parser.parseExpression(this.expressionString);
    }

}