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Java example source code file (XSObjectListImpl.java)

This example Java source code file (XSObjectListImpl.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractlist, class, default_size, empty_iterator, empty_list, indexoutofboundsexception, listiterator, nosuchelementexception, object, reflection, unsupportedoperationexception, util, xsobject, xsobjectlistimpl, xsobjectlistiterator

The XSObjectListImpl.java Java example source code

/*
 * 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 java.lang.reflect.Array;
import java.util.AbstractList;
import java.util.Iterator;
import java.util.ListIterator;
import java.util.NoSuchElementException;

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 1.7 2010-11-01 04:40:06 joehw Exp $
 */
public class XSObjectListImpl extends AbstractList implements XSObjectList {

    /**
     * An immutable empty list.
     */
    public static final XSObjectListImpl EMPTY_LIST = new XSObjectListImpl(new XSObject[0], 0);
    private static final ListIterator EMPTY_ITERATOR = new ListIterator() {
        public boolean hasNext() {
            return false;
        }
        public Object next() {
            throw new NoSuchElementException();
        }
        public boolean hasPrevious() {
            return false;
        }
        public Object previous() {
            throw new NoSuchElementException();
        }
        public int nextIndex() {
            return 0;
        }
        public int previousIndex() {
            return -1;
        }
        public void remove() {
            throw new UnsupportedOperationException();
        }
        public void set(Object object) {
            throw new UnsupportedOperationException();
        }
        public void add(Object object) {
            throw new UnsupportedOperationException();
        }
    };

    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 in the list. The range of valid
     * child node indices is 0 to <code>length-1 inclusive.
     */
    public int getLength() {
        return fLength;
    }

    /**
     * Returns the <code>indexth item in the collection. The index
     * starts at 0. If <code>index is greater than or equal to the
     * number of nodes in the list, this returns <code>null.
     * @param index index into the collection.
     * @return The XSObject at the <code>indexth position in the
     *   <code>XSObjectList, or null 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 clearXSObjectList() {
        for (int i=0; i<fLength; i++) {
            fArray[i] = null;
        }
        fArray = null;
        fLength = 0;
    }

    public void addXSObject(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 addXSObject(int index, XSObject object) {
        fArray[index] = object;
    }

    /*
     * List methods
     */

    public boolean contains(Object value) {
        return (value == null) ? containsNull() : containsObject(value);
    }

    public Object get(int index) {
        if (index >= 0 && index < fLength) {
            return fArray[index];
        }
        throw new IndexOutOfBoundsException("Index: " + index);
    }

    public int size() {
        return getLength();
    }

    public Iterator iterator() {
        return listIterator0(0);
    }

    public ListIterator listIterator() {
        return listIterator0(0);
    }

    public ListIterator listIterator(int index) {
        if (index >= 0 && index < fLength) {
            return listIterator0(index);
        }
        throw new IndexOutOfBoundsException("Index: " + index);
    }

    private ListIterator listIterator0(int index) {
        return fLength == 0 ? EMPTY_ITERATOR : new XSObjectListIterator(index);
    }

    private boolean containsObject(Object value) {
        for (int i = fLength - 1; i >= 0; --i) {
            if (value.equals(fArray[i])) {
                return true;
            }
        }
        return false;
    }

    private boolean containsNull() {
        for (int i = fLength - 1; i >= 0; --i) {
            if (fArray[i] == null) {
                return true;
            }
        }
        return false;
    }

    public Object[] toArray() {
        Object[] a = new Object[fLength];
        toArray0(a);
        return a;
    }

    public Object[] toArray(Object[] a) {
        if (a.length < fLength) {
            Class arrayClass = a.getClass();
            Class componentType = arrayClass.getComponentType();
            a = (Object[]) Array.newInstance(componentType, fLength);
        }
        toArray0(a);
        if (a.length > fLength) {
            a[fLength] = null;
        }
        return a;
    }

    private void toArray0(Object[] a) {
        if (fLength > 0) {
            System.arraycopy(fArray, 0, a, 0, fLength);
        }
    }

    private final class XSObjectListIterator implements ListIterator {
        private int index;
        public XSObjectListIterator(int index) {
            this.index = index;
        }
        public boolean hasNext() {
            return (index < fLength);
        }
        public Object next() {
            if (index < fLength) {
                return fArray[index++];
            }
            throw new NoSuchElementException();
        }
        public boolean hasPrevious() {
            return (index > 0);
        }
        public Object previous() {
            if (index > 0) {
                return fArray[--index];
            }
            throw new NoSuchElementException();
        }
        public int nextIndex() {
            return index;
        }
        public int previousIndex() {
            return index - 1;
        }
        public void remove() {
            throw new UnsupportedOperationException();
        }
        public void set(Object o) {
            throw new UnsupportedOperationException();
        }
        public void add(Object o) {
            throw new UnsupportedOperationException();
        }
    }

} // class XSObjectListImpl

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