/*
* reserved comment block
* DO NOT REMOVE OR ALTER!
*/
/*
* Copyright 2002,2003-2004 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 com.sun.org.apache.xerces.internal.impl.xs.util;
import com.sun.org.apache.xerces.internal.xs.XSObject;
import com.sun.org.apache.xerces.internal.xs.XSObjectList;
/**
* Containts a list of XSObject's.
*
* @xerces.internal
*
* @author Sandy Gao, IBM
*
* @version $Id: XSObjectListImpl.java,v 1.2.6.1 2005/09/09 07:28:13 sunithareddy Exp $
*/
public class XSObjectListImpl implements XSObjectList {
/**
* An immutable empty list.
*/
public static final XSObjectList EMPTY_LIST = new XSObjectList () {
public int getLength() {
return 0;
}
public XSObject item(int index) {
return null;
}
};
private static final int DEFAULT_SIZE = 4;
// The array to hold all data
private XSObject[] fArray = null;
// Number of elements in this list
private int fLength = 0;
public XSObjectListImpl() {
fArray = new XSObject[DEFAULT_SIZE];
fLength = 0;
}
/**
* Construct an XSObjectList implementation
*
* @param array the data array
* @param length the number of elements
*/
public XSObjectListImpl(XSObject[] array, int length) {
fArray = array;
fLength = length;
}
/**
* The number of <code>XSObjects</code> in the list. The range of valid
* child node indices is 0 to <code>length-1</code> inclusive.
*/
public int getLength() {
return fLength;
}
/**
* Returns the <code>index</code>th item in the collection. The index
* starts at 0. If <code>index</code> is greater than or equal to the
* number of nodes in the list, this returns <code>null</code>.
* @param index index into the collection.
* @return The XSObject at the <code>index</code>th position in the
* <code>XSObjectList</code>, or <code>null</code> if that is not a
* valid index.
*/
public XSObject item(int index) {
if (index < 0 || index >= fLength)
return null;
return fArray[index];
}
// clear this object
public void clear() {
for (int i=0; i<fLength; i++) {
fArray[i] = null;
}
fArray = null;
fLength = 0;
}
public void add (XSObject object){
if (fLength == fArray.length){
XSObject[] temp = new XSObject[fLength + 4];
System.arraycopy(fArray, 0, temp, 0, fLength);
fArray = temp;
}
fArray[fLength++]=object;
}
public void add (int index, XSObject object){
fArray [index] = object;
}
} // class XSObjectList