/*
 * Copyright (c) 2002-2012 Alibaba Group Holding Limited.
 * All rights reserved.
 *
 * 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 com.alibaba.citrus.expr;

import static org.junit.Assert.*;

import java.util.Date;

import com.alibaba.citrus.expr.composite.CompositeExpressionFactory;
import com.alibaba.citrus.expr.support.MappedExpressionContext;
import org.junit.Before;
import org.junit.Test;

/**
 * 测试<code>CompositeExpression</code>。
 *
 * @author Michael Zhou
 */
public class CompositeExpressionTests {
    private ExpressionFactory factory;
    private ExpressionContext context;
    private Date              now;

    @Before
    public void init() {
        factory = new CompositeExpressionFactory();
        context = new MappedExpressionContext();
        now = new Date();
        context.put("now", now);
    }

    @Test
    public void constantExpression() throws Exception {
        assertEquals("abc", evaluate("abc"));
        assertEquals("null", evaluate("null"));
        assertEquals("", evaluate(""));
    }

    @Test
    public void jexlExpression() throws Exception {
        assertSame(now, evaluate("${now}"));
        assertEquals(new Long(now.getTime()), evaluate("${now.time}"));
        assertEquals(null, evaluate("${null}"));
        assertEquals(new Integer(123), evaluate("${123}"));
        assertEquals("abc", evaluate("${'abc'}"));
        assertEquals(Boolean.TRUE, evaluate("${2 > 1}"));
    }

    @Test
    public void compositeExpression() throws Exception {
        assertEquals("it is " + now + " now", evaluate("it is ${now} now"));
        assertEquals("2 > 1 == true", evaluate("2 > 1 == ${2 > 1}"));
    }

    private Object evaluate(String expr) throws ExpressionParseException {
        return factory.createExpression(expr).evaluate(context);
    }
}