camel-2.8.x/camel-core/src/test/java/org/apache/camel/converter/CollectionConverterTest.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.camel.converter;

import java.util.Arrays;
import java.util.Collection;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.Set;

import junit.framework.TestCase;
import org.apache.camel.util.CaseInsensitiveMap;

/**
 * Test cases for {@link CollectionConverter}
 */
@SuppressWarnings("unchecked")
public class CollectionConverterTest extends TestCase {
    
    private static final List<String> SMURFS = Arrays.asList("Papa smurf", "Smurfette", "Hefty smurf", "Jokey smurf");

    public void testIteratorToList() throws Exception {
        assertSmurfs(CollectionConverter.toArrayList(SMURFS.iterator()));
    }
    
    public void testIterableToList() throws Exception {
        assertSmurfs(CollectionConverter.toList(new Iterable() {
            public Iterator iterator() {
                return SMURFS.iterator();
            }
        }));
        // no conversion should occur for the list itself
        assertSame(SMURFS, CollectionConverter.toList((Iterable) SMURFS));
    }

    private void assertSmurfs(Collection<String> result) {
        assertEquals(SMURFS.size(), result.size());
        for (String key : result) {
            assertTrue(SMURFS.contains(key));
        }
    }

    public void testToArray() {
        assertEquals(null, CollectionConverter.toArray(null));
        Object[] data = CollectionConverter.toArray(SMURFS);
        assertEquals(4, data.length);
    }

    public void testToList() {
        List out = CollectionConverter.toList(SMURFS);
        assertEquals(4, out.size());
    }

    public void testToSet() {
        Map map = new HashMap();
        map.put("foo", "bar");

        Set out = CollectionConverter.toSet(map);
        assertEquals(1, out.size());
    }

    public void testToHashMap() {
        Map map = new CaseInsensitiveMap();
        map.put("foo", "bar");

        HashMap out = CollectionConverter.toHashMap(map);
        assertEquals(1, out.size());
    }

    public void testToHashtable() {
        Map map = new CaseInsensitiveMap();
        map.put("foo", "bar");

        Hashtable out = CollectionConverter.toHashtable(map);
        assertEquals(1, out.size());
    }

    public void testToProperties() {
        Map map = new HashMap();
        map.put("foo", "bar");

        Properties prop = CollectionConverter.toProperties(map);
        assertNotNull(prop);
        assertEquals(1, prop.size());
        assertEquals("bar", prop.get("foo"));
    }
}