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/*
 * Copyright 2013 Monocrea Inc.
 *
 * 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.sitoolkit.wt.infra;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.Expression;
import org.springframework.expression.ExpressionParser;
import org.springframework.expression.ParserContext;
import org.springframework.expression.common.TemplateParserContext;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;

/**
 *
 * @author yuichi.kuwahara
 */
public class ELSupport {

    protected final Logger LOG = LoggerFactory.getLogger(getClass());

    protected ExpressionParser parser = new SpelExpressionParser();

    protected ParserContext parserContext = new TemplateParserContext();

    private EvaluationContext ctx;

    protected Object rootObject;

    public ELSupport(Object rootObject) {
        super();
        this.rootObject = rootObject;
        ctx = new StandardEvaluationContext(rootObject);
    }

    public String evaluate(String value) {
        if (StringUtils.isEmpty(value)) {
            return StringUtils.EMPTY;
        }
        Expression exp = parser.parseExpression(value, parserContext);
        return StringUtils.defaultString(
                ctx == null ? exp.getValue(String.class) : exp.getValue(ctx, String.class));
    }

    public Object getRootObject() {
        return rootObject;
    }

    public void setRootObject(Object rootObject) {
        this.rootObject = rootObject;
    }
}