Commons Collections example source code file (TestPredicatedBag.java)

This example Commons Collections source code file (TestPredicatedBag.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 - Commons Collections tags/keywords

bag, bag, hashbag, hashbag, illegalargumentexception, illegalargumentexception, integer, integer, object, predicate, predicatedbag, string, testpredicatedbag, unique, util

The Commons Collections TestPredicatedBag.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.commons.collections.bag;

import java.util.Set;

import junit.framework.Test;
import junit.framework.TestSuite;

import org.apache.commons.collections.Bag;
import org.apache.commons.collections.Predicate;
import org.apache.commons.collections.PredicateUtils;

/**
 * Extension of {@link TestBag} for exercising the {@link PredicatedBag}
 * implementation.
 *
 * @since Commons Collections 3.0
 * @version $Revision: 646780 $ $Date: 2008-04-10 13:48:07 +0100 (Thu, 10 Apr 2008) $
 * 
 * @author Phil Steitz
 */
public class TestPredicatedBag extends AbstractTestBag {
    
    public TestPredicatedBag(String testName) {
        super(testName);
    }

    public static Test suite() {
        return new TestSuite(TestPredicatedBag.class);
    }

    public static void main(String args[]) {
        String[] testCaseName = { TestPredicatedBag.class.getName()};
        junit.textui.TestRunner.main(testCaseName);
    }
    
    //--------------------------------------------------------------------------

    protected Predicate stringPredicate() {
        return new Predicate() {
            public boolean evaluate(Object o) {
                return o instanceof String;
            }
        };
    }   
    
    protected Predicate truePredicate = PredicateUtils.truePredicate();
    
    protected Bag decorateBag(HashBag bag, Predicate predicate) {
        return PredicatedBag.decorate(bag, predicate);
    }

    public Bag makeBag() {
        return decorateBag(new HashBag(), truePredicate);
    }
    
    protected Bag makeTestBag() {
        return decorateBag(new HashBag(), stringPredicate());
    }
    
    //--------------------------------------------------------------------------

    public void testlegalAddRemove() {
        Bag bag = makeTestBag();
        assertEquals(0, bag.size());
        Object[] els = new Object[] {"1", "3", "5", "7", "2", "4", "1"};
        for (int i = 0; i < els.length; i++) {
            bag.add(els[i]);
            assertEquals(i + 1, bag.size());
            assertEquals(true, bag.contains(els[i]));
        }
        Set set = ((PredicatedBag) bag).uniqueSet();
        assertTrue("Unique set contains the first element",set.contains(els[0]));
        assertEquals(true, bag.remove(els[0])); 
        set = ((PredicatedBag) bag).uniqueSet();
        assertTrue("Unique set now does not contain the first element",
            !set.contains(els[0])); 
    }
 
    public void testIllegalAdd() {
        Bag bag = makeTestBag();
        Integer i = new Integer(3);
        try {
            bag.add(i);
            fail("Integer should fail string predicate.");
        } catch (IllegalArgumentException e) {
            // expected
        }
        assertTrue("Collection shouldn't contain illegal element", 
         !bag.contains(i));   
    }

    public void testIllegalDecorate() {
        HashBag elements = new HashBag();
        elements.add("one");
        elements.add("two");
        elements.add(new Integer(3));
        elements.add("four");
        try {
            Bag bag = decorateBag(elements, stringPredicate());
            fail("Bag contains an element that should fail the predicate.");
        } catch (IllegalArgumentException e) {
            // expected
        }
        try {
            Bag bag = decorateBag(new HashBag(), null);
            fail("Expectiing IllegalArgumentException for null predicate.");
        } catch (IllegalArgumentException e) {
            // expected
        }              
    }

    public String getCompatibilityVersion() {
        return "3.1";
    }

//    public void testCreate() throws Exception {
//        Bag bag = makeBag();
//        writeExternalFormToDisk((java.io.Serializable) bag, "D:/dev/collections/data/test/PredicatedBag.emptyCollection.version3.1.obj");
//        bag = makeBag();
//        bag.add("A");
//        bag.add("A");
//        bag.add("B");
//        bag.add("B");
//        bag.add("C");
//        writeExternalFormToDisk((java.io.Serializable) bag, "D:/dev/collections/data/test/PredicatedBag.fullCollection.version3.1.obj");
//    }

}