Mega Code Archive

 

Categories / Java / XML

 

Wrap Node List to Collection

/*   Copyright 2009 Tomer Gabel <tomer@tomergabel.com>   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.   ant-intellij-tasks project (http://code.google.com/p/ant-intellij-tasks/)   $Id: XmlUtils.java 106 2009-09-30 02:07:29Z tomergabel $ */ //package com.tomergabel.util; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import java.util.Collection; import java.util.Iterator; import java.util.NoSuchElementException; public final class XmlUtils {     private XmlUtils() {     }     public static Collection<Node> wrapNodeList( final NodeList nodeList ) throws IllegalArgumentException {         if ( nodeList == null )             throw new IllegalArgumentException( "Cannot wrap null NodeList" );         return new Collection<Node>() {             @Override             public int size() {                 return nodeList.getLength();             }             @Override             public boolean isEmpty() {                 return nodeList.getLength() > 0;             }             @Override             public boolean contains( final Object o ) {                 if ( o == null || !( o instanceof Node ) )                     return false;                 for ( int i = 0; i < nodeList.getLength(); ++i )                     if ( o == nodeList.item( i ) )                         return true;                 return false;             }             @Override             public Iterator<Node> iterator() {                 return new Iterator<Node>() {                     private int index = 0;                     @Override                     public boolean hasNext() {                         return nodeList.getLength() > this.index;                     }                     @Override                     public Node next() {                         if ( this.index >= nodeList.getLength() )                             throw new NoSuchElementException();                         return nodeList.item( this.index++ );                     }                     @Override                     public void remove() {                         throw new UnsupportedOperationException();                     }                 };             }             @Override             public Object[] toArray() {                 final Node[] array = new Node[nodeList.getLength()];                 for ( int i = 0; i < array.length; ++i )                     array[ i ] = nodeList.item( i );                 return array;             }             @Override             @SuppressWarnings( { "unchecked" } )             public <T> T[] toArray( final T[] a ) throws ArrayStoreException {                 if ( !a.getClass().getComponentType().isAssignableFrom( Node.class ) )                     throw new ArrayStoreException(                             a.getClass().getComponentType().getName() + " is not the same or a supertype of Node" );                 if ( a.length >= nodeList.getLength() ) {                     for ( int i = 0; i < nodeList.getLength(); ++i )                         a[ i ] = (T) nodeList.item( i );                     if ( a.length > nodeList.getLength() )                         a[ nodeList.getLength() ] = null;                     return a;                 }                 return (T[]) toArray();             }             @Override             public boolean add( final Node node ) {                 throw new UnsupportedOperationException();             }             @Override             public boolean remove( final Object o ) {                 throw new UnsupportedOperationException();             }             @Override             public boolean containsAll( final Collection<?> c ) {                 for ( final Object o : c )                     if ( !this.contains( o ) )                         return false;                 return true;             }             @Override             public boolean addAll( final Collection<? extends Node> c ) {                 throw new UnsupportedOperationException();             }             @Override             public boolean removeAll( final Collection<?> c ) {                 throw new UnsupportedOperationException();             }             @Override             public boolean retainAll( final Collection<?> c ) {                 throw new UnsupportedOperationException();             }             @Override             public void clear() {                 throw new UnsupportedOperationException();             }         };     } }