/* | |
* Copyright 2003,2004 The Apache Software Foundation. | |
* | |
* 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 org.apache.pluto.util; | |
import java.util.Collection; | |
import java.util.Enumeration; | |
import java.util.Iterator; | |
import java.util.Map; | |
import java.util.NoSuchElementException; | |
/** | |
* Uitlity class to wraps an <code>Enumeration</code> around a Collection, i.e. | |
* <code>Iterator</code> classes. | |
*/ | |
public final class Enumerator implements Enumeration { | |
// Iterator over which the Enumeration takes place | |
private Iterator iterator = null; | |
/** | |
* Returns an Enumeration over the specified Collection. | |
* @param collection Collection with values that should be enumerated | |
*/ | |
public Enumerator(Collection collection) { | |
this(collection.iterator()); | |
} | |
/** | |
* Returns an Enumeration over the values of the specified Iterator. | |
* @param iterator Iterator to be wrapped | |
*/ | |
public Enumerator(Iterator iterator) { | |
super(); | |
this.iterator = iterator; | |
} | |
/** | |
* Returns an Enumeration over the values of the specified Map. | |
* @param map Map with values that should be enumerated | |
*/ | |
public Enumerator(Map map) { | |
this(map.values().iterator()); | |
} | |
/** | |
* Tests if this enumeration contains more elements. | |
* @return <code>true</code> if this enumeration contains at least one more | |
* element to provide, <code>false</code> otherwise. | |
*/ | |
public boolean hasMoreElements() { | |
return (iterator.hasNext()); | |
} | |
/** | |
* Returns the next element of this enumeration. | |
* @return the next element of this enumeration | |
* @throws NoSuchElementException if no more elements exist | |
*/ | |
public Object nextElement() throws NoSuchElementException { | |
return (iterator.next()); | |
} | |
} |