| /************************************************************** |
| * |
| * 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 |
| * |
| * 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 org.openoffice.xmerge.merger.diff; |
| |
| import org.openoffice.xmerge.merger.Iterator; |
| |
| /** |
| * <p>This is an implementation of the <code>Iterator</code> interface. |
| * It is based upon a simple <code>Object</code> array.</p> |
| * |
| * <p>Note: this class is not thread safe for performance reasons.</p> |
| * |
| * @author smak |
| */ |
| public final class ObjectArrayIterator implements Iterator { |
| |
| |
| /** |
| * The <code>Object</code> array. |
| */ |
| private Object [] objArray; |
| private int currentPosition; |
| |
| |
| /** |
| * Private default constructor. |
| */ |
| private ObjectArrayIterator() { |
| // do not allow user new a ObjectArrayIterator without argument |
| } |
| |
| |
| /** |
| * Standard constructor. |
| * |
| * @param objArray The <code>Object</code> 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</code>. |
| * |
| * @param object <code>Object</code> to replace. |
| */ |
| public void replace(Object object) { |
| objArray[currentPosition] = object; |
| } |
| |
| |
| /** |
| * Insert <code>Object</code> after current <code>Object</code>. |
| * |
| * @param object <code>Object</code> 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</code> after current <code>Object</code>. |
| * |
| * @param object <code>Object</code> 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</code>. |
| */ |
| 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 |
| } |
| } |
| |