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Java > Open Source Codes > com > sun > org > apache > xerces > internal > impl > xs > util > XSObjectListImpl


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57
58 package com.sun.org.apache.xerces.internal.impl.xs.util;
59
60 import com.sun.org.apache.xerces.internal.xs.XSObject;
61 import com.sun.org.apache.xerces.internal.xs.XSObjectList;
62
63 /**
64  * Containts a list of XSObject's.
65  *
66  * @author Sandy Gao, IBM
67  *
68  * @version $Id: XSObjectListImpl.java,v 1.7 2003/11/11 20:15:00 sandygao Exp $
69  */
70 public class XSObjectListImpl implements XSObjectList {
71
72     private final int DEFAULT_SIZE = 4;
73
74     // The array to hold all data
75 private XSObject[] fArray = null;
76     // Number of elements in this list
77 private int fLength = 0;
78     
79
80
81     public XSObjectListImpl(){
82         fArray = new XSObject[DEFAULT_SIZE];
83         fLength = 0;
84     }
85
86     /**
87      * Construct an XSObjectList implementation
88      *
89      * @param array the data array
90      * @param length the number of elements
91      */
92     public XSObjectListImpl(XSObject[] array, int length) {
93         fArray = array;
94         fLength = length;
95     }
96
97     /**
98      * The number of <code>XSObjects</code> in the list. The range of valid
99      * child node indices is 0 to <code>length-1</code> inclusive.
100      */
101     public int getLength() {
102         return fLength;
103     }
104
105     /**
106      * Returns the <code>index</code>th item in the collection. The index
107      * starts at 0. If <code>index</code> is greater than or equal to the
108      * number of nodes in the list, this returns <code>null</code>.
109      * @param index index into the collection.
110      * @return The XSObject at the <code>index</code>th position in the
111      * <code>XSObjectList</code>, or <code>null</code> if that is not a
112      * valid index.
113      */
114     public XSObject item(int index) {
115         if (index < 0 || index >= fLength)
116             return null;
117         return fArray[index];
118     }
119
120     // clear this object
121 public void clear() {
122         for (int i=0; i<fLength; i++) {
123             fArray[i] = null;
124         }
125         fArray = null;
126         fLength = 0;
127     }
128     
129     public void add (XSObject object){
130        if (fLength == fArray.length){
131            XSObject[] temp = new XSObject[fLength + 4];
132            System.arraycopy(fArray, 0, temp, 0, fLength);
133            fArray = temp;
134        }
135        fArray[fLength++]=object;
136     }
137     public void add (int index, XSObject object){
138         fArray [index] = object;
139     }
140
141 } // class XSObjectList
142
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