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/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you 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 .
*/
package org.openoffice.xmerge.merger.diff;
import org.openoffice.xmerge.merger.Iterator;
/**
* This is an implementation of the {@code Iterator} interface.
*
* <p>It is based upon a simple {@code Object} array.</p>
*
* <p>Note: this class is not thread safe for performance reasons.</p>
*/
public final class ObjectArrayIterator implements Iterator {
/** The {@code Object} array. */
private Object [] objArray;
private int currentPosition;
/**
* Standard constructor.
*
* @param objArray The {@code Object} array.
*/
public ObjectArrayIterator(Object [] objArray) {
if (objArray != null) {
this.objArray = new Object[objArray.length];
System.arraycopy(objArray, 0, this.objArray, 0, objArray.length);
currentPosition = 0;
} else {
this.objArray = new Object[0];
}
}
public Object next() {
if (currentPosition < objArray.length - 1) {
currentPosition++;
return currentElement();
} else {
return null;
}
}
public Object previous() {
if (currentPosition > 0) {
currentPosition--;
return currentElement();
} else {
return null;
}
}
public Object start() {
currentPosition = 0;
return currentElement();
}
public Object end() {
if (objArray.length > 0) {
currentPosition = objArray.length - 1;
}
return currentElement();
}
public Object currentElement() {
if (objArray.length > 0) {
return objArray[currentPosition];
} else {
return null;
}
}
/**
* Replace current {@code Object}.
*
* @param object {@code Object} to replace.
*/
public void replace(Object object) {
objArray[currentPosition] = object;
}
/**
* Insert {@code Object} after current {@code Object}.
*
* @param object {@code Object} to insert.
*/
public void insert(Object object) {
Object [] objArray2 = new Object[objArray.length+1];
// copy the array content up before the currentposition
if (currentPosition > 0) {
System.arraycopy(objArray, 0, objArray2, 0, currentPosition);
}
objArray2[currentPosition] = object;
// copy the array content up after the currentposition
System.arraycopy(objArray, currentPosition, objArray2,
currentPosition + 1, objArray.length - currentPosition);
objArray = objArray2;
currentPosition++;
}
/**
* Append {@code Object} after current {@code Object}.
*
* @param object {@code Object} to append.
*/
public void append(Object object) {
Object [] objArray2 = new Object[objArray.length + 1];
int newPosition = currentPosition + 1;
// copy the array content up to the currentposition
System.arraycopy(objArray, 0, objArray2, 0, newPosition);
objArray2[newPosition] = object;
// copy the array content up after the currentposition
if (currentPosition < objArray.length - 1) {
System.arraycopy(objArray, newPosition, objArray2,
newPosition + 1, objArray.length - newPosition);
}
objArray = objArray2;
}
/**
* Remove current {@code Object}.
*/
public void remove() {
Object [] objArray2 = new Object[objArray.length - 1];
// copy the array content up before the currentposition
if (currentPosition > 0) {
System.arraycopy(objArray, 0, objArray2, 0, currentPosition);
}
// copy the array content up after the currentposition
if (currentPosition < objArray.length - 1) {
System.arraycopy(objArray, currentPosition + 1, objArray2,
currentPosition, objArray.length - currentPosition - 1);
}
objArray = objArray2;
if (currentPosition == objArray.length)
currentPosition--;
}
public int elementCount() {
return objArray.length;
}
public boolean equivalent(Object obj1, Object obj2) {
return obj1.equals(obj2);
}
public void refresh() {
// do nothing
}
}
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