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ActiveMQ example source code file (SelectorParserTest.java)

This example ActiveMQ source code file (SelectorParserTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

booleanexpression, comparisonexpression, comparisonexpression, created, exception, expression, expression, logger, logicexpression, logicexpression, propertyexpression, propertyexpression, string, xpath

The ActiveMQ SelectorParserTest.java source code

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.activemq.selector;

import junit.framework.TestCase;
import org.apache.activemq.filter.BooleanExpression;
import org.apache.activemq.filter.ComparisonExpression;
import org.apache.activemq.filter.Expression;
import org.apache.activemq.filter.LogicExpression;
import org.apache.activemq.filter.PropertyExpression;
import org.apache.activemq.filter.XPathExpression;
import org.apache.activemq.spring.ConsumerBean;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * 
 */
public class SelectorParserTest extends TestCase {
    private static final Logger LOG = LoggerFactory.getLogger(SelectorParserTest.class);

    public void testParseXPath() throws Exception {
        BooleanExpression filter = parse("XPATH '//title[@lang=''eng'']'");
        assertTrue("Created XPath expression", filter instanceof XPathExpression);
        LOG.info("Expression: " + filter);
    }

    public void testParseWithParensAround() throws Exception {
        String[] values = {"x = 1 and y = 2", "(x = 1) and (y = 2)", "((x = 1) and (y = 2))"};

        for (int i = 0; i < values.length; i++) {
            String value = values[i];
            LOG.info("Parsing: " + value);

            BooleanExpression andExpression = parse(value);
            assertTrue("Created LogicExpression expression", andExpression instanceof LogicExpression);
            LogicExpression logicExpression = (LogicExpression)andExpression;
            Expression left = logicExpression.getLeft();
            Expression right = logicExpression.getRight();

            assertTrue("Left is a binary filter", left instanceof ComparisonExpression);
            assertTrue("Right is a binary filter", right instanceof ComparisonExpression);
            ComparisonExpression leftCompare = (ComparisonExpression)left;
            ComparisonExpression rightCompare = (ComparisonExpression)right;
            assertPropertyExpression("left", leftCompare.getLeft(), "x");
            assertPropertyExpression("right", rightCompare.getLeft(), "y");
        }
    }

    protected void assertPropertyExpression(String message, Expression expression, String expected) {
        assertTrue(message + ". Must be PropertyExpression", expression instanceof PropertyExpression);
        PropertyExpression propExp = (PropertyExpression)expression;
        assertEquals(message + ". Property name", expected, propExp.getName());
    }

    protected BooleanExpression parse(String text) throws Exception {
        return SelectorParser.parse(text);
    }
}

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