SelectorParserTest.java

/**
 * 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 javax.jms.InvalidSelectorException;

import junit.framework.TestCase;

import org.apache.activemq.filter.BooleanExpression;
import org.apache.activemq.filter.BooleanFunctionCallExpr;
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.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 *
 */
public class SelectorParserTest extends TestCase {

   private static final Logger LOG = LoggerFactory.getLogger(SelectorParserTest.class);

   public void testFunctionCall() throws Exception {
      Object filter = parse("REGEX('sales.*', group)");
      assertTrue("expected type", filter instanceof BooleanFunctionCallExpr);
      LOG.info("function exp:" + filter);

      // non existent function
      try {
         parse("DoesNotExist('sales.*', group)");
         fail("expect ex on non existent function");
      } catch (InvalidSelectorException expected) {
      }

   }

   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);
   }
}