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/* |
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* The Apache Software License, Version 1.1 |
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* |
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* Copyright (c) 2002 The Apache Software Foundation. All rights |
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* reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in |
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* the documentation and/or other materials provided with the |
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* distribution. |
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* |
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* 3. The end-user documentation included with the redistribution, if |
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* any, must include the following acknowlegement: |
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* "This product includes software developed by the |
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* Apache Software Foundation (http://www.apache.org/)." |
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* Alternately, this acknowlegement may appear in the software itself, |
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* if and wherever such third-party acknowlegements normally appear. |
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* |
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* 4. The names "The Jakarta Project", "Ant", and "Apache Software |
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* Foundation" must not be used to endorse or promote products derived |
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* from this software without prior written permission. For written |
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* permission, please contact apache@apache.org. |
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* |
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* 5. Products derived from this software may not be called "Apache" |
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* nor may "Apache" appear in their names without prior written |
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* permission of the Apache Group. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* ==================================================================== |
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* |
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* This software consists of voluntary contributions made by many |
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* individuals on behalf of the Apache Software Foundation. For more |
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* information on the Apache Software Foundation, please see |
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* <http://www.apache.org/>. |
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*/ |
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package org.apache.tools.ant.taskdefs.optional.junit; |
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import java.util.Enumeration; |
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import java.util.NoSuchElementException; |
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/** |
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* Convenient enumeration over an array of enumeration. For example: |
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* <pre> |
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* Enumeration e1 = v1.elements(); |
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* while (e1.hasMoreElements()){ |
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* // do something |
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* } |
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* Enumeration e2 = v2.elements(); |
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* while (e2.hasMoreElements()){ |
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* // do the same thing |
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* } |
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* </pre> |
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* can be written as: |
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* <pre> |
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* Enumeration[] enums = { v1.elements(), v2.elements() }; |
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* Enumeration e = Enumerations.fromCompound(enums); |
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* while (e.hasMoreElements()){ |
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* // do something |
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* } |
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* </pre> |
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* Note that the enumeration will skip null elements in the array. The following is |
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* thus possible: |
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* <pre> |
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* Enumeration[] enums = { v1.elements(), null, v2.elements() }; // a null enumeration in the array |
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* Enumeration e = Enumerations.fromCompound(enums); |
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* while (e.hasMoreElements()){ |
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* // do something |
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* } |
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* </pre> |
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* @author <a href="mailto:sbailliez@imediation.com">Stephane Bailliez</a> |
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*/ |
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class CompoundEnumeration implements Enumeration { |
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/** enumeration array */ |
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private Enumeration[] enumArray; |
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/** index in the enums array */ |
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private int index = 0; |
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public CompoundEnumeration(Enumeration[] enumarray) { |
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this.enumArray = enumarray; |
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} |
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/** |
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* Tests if this enumeration contains more elements. |
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* |
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* @return <code>true</code> if and only if this enumeration object |
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* contains at least one more element to provide; |
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* <code>false</code> otherwise. |
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*/ |
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public boolean hasMoreElements() { |
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while (index < enumArray.length) { |
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if (enumArray[index] != null && enumArray[index].hasMoreElements()) { |
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return true; |
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} |
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index++; |
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} |
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return false; |
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} |
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/** |
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* Returns the next element of this enumeration if this enumeration |
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* object has at least one more element to provide. |
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* |
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* @return the next element of this enumeration. |
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* @throws NoSuchElementException if no more elements exist. |
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*/ |
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public Object nextElement() throws NoSuchElementException { |
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if ( hasMoreElements() ) { |
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return enumArray[index].nextElement(); |
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} |
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throw new NoSuchElementException(); |
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} |
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} |