| /* |
| * 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. |
| */ |
| /* |
| * $Id$ |
| */ |
| package org.apache.xalan.lib.sql; |
| |
| import java.util.Vector; |
| |
| /** |
| * Provide a simple Array storage mechinsim where native Arrays will be use as |
| * the basic storage mechinism but the Arrays will be stored as blocks. |
| * The size of the Array blocks is determine during object construction. |
| * This is intended to be a simple storage mechinsim where the storage only |
| * can grow. Array elements can not be removed, only added to. |
| */ |
| public class ObjectArray |
| { |
| /** |
| */ |
| private int m_minArraySize = 10; |
| /** |
| * The container of all the sub arrays |
| */ |
| private Vector m_Arrays = new Vector(200); |
| |
| /** |
| * An index that porvides the Vector entry for the current Array that is |
| * being appended to. |
| */ |
| private _ObjectArray m_currentArray; |
| |
| |
| /** |
| * The next offset in the current Array to append a new object |
| */ |
| private int m_nextSlot; |
| |
| |
| /** |
| */ |
| public ObjectArray( ) |
| { |
| // |
| // Default constructor will work with a minimal fixed size |
| // |
| init(10); |
| } |
| |
| /** |
| * @param minArraySize The size of the Arrays stored in the Vector |
| */ |
| public ObjectArray( final int minArraySize ) |
| { |
| init(minArraySize); |
| } |
| |
| /** |
| * @param size |
| * |
| */ |
| private void init( int size ) |
| { |
| m_minArraySize = size; |
| m_currentArray = new _ObjectArray(m_minArraySize); |
| } |
| |
| /** |
| * @param idx Index of the Object in the Array |
| * |
| */ |
| public Object getAt( final int idx ) |
| { |
| int arrayIndx = idx / m_minArraySize; |
| int arrayOffset = idx - (arrayIndx * m_minArraySize); |
| |
| // |
| // If the array has been off loaded to the Vector Storage them |
| // grab it from there. |
| if (arrayIndx < m_Arrays.size()) |
| { |
| _ObjectArray a = (_ObjectArray)m_Arrays.elementAt(arrayIndx); |
| return a.objects[arrayOffset]; |
| } |
| else |
| { |
| // We must be in the current array, so pull it from there |
| |
| // %REVIEW% We may want to check to see if arrayIndx is only |
| // one freater that the m_Arrays.size(); This code is safe but |
| // will repete if the index is greater than the array size. |
| return m_currentArray.objects[arrayOffset]; |
| } |
| } |
| |
| /** |
| * @param idx Index of the Object in the Array |
| * @param obj , The value to set in the Array |
| * |
| */ |
| public void setAt( final int idx, final Object obj ) |
| { |
| int arrayIndx = idx / m_minArraySize; |
| int arrayOffset = idx - (arrayIndx * m_minArraySize); |
| |
| // |
| // If the array has been off loaded to the Vector Storage them |
| // grab it from there. |
| if (arrayIndx < m_Arrays.size()) |
| { |
| _ObjectArray a = (_ObjectArray)m_Arrays.elementAt(arrayIndx); |
| a.objects[arrayOffset] = obj; |
| } |
| else |
| { |
| // We must be in the current array, so pull it from there |
| |
| // %REVIEW% We may want to check to see if arrayIndx is only |
| // one freater that the m_Arrays.size(); This code is safe but |
| // will repete if the index is greater than the array size. |
| m_currentArray.objects[arrayOffset] = obj; |
| } |
| } |
| |
| |
| |
| /** |
| * @param o Object to be appended to the Array |
| * |
| */ |
| public int append( Object o ) |
| { |
| if (m_nextSlot >= m_minArraySize) |
| { |
| m_Arrays.addElement(m_currentArray); |
| m_nextSlot = 0; |
| m_currentArray = new _ObjectArray(m_minArraySize); |
| } |
| |
| m_currentArray.objects[m_nextSlot] = o; |
| |
| int pos = (m_Arrays.size() * m_minArraySize) + m_nextSlot; |
| |
| m_nextSlot++; |
| |
| return pos; |
| } |
| |
| |
| /** |
| */ |
| class _ObjectArray |
| { |
| /** |
| */ |
| public Object[] objects; |
| /** |
| * @param size |
| */ |
| public _ObjectArray( int size ) |
| { |
| objects = new Object[size]; |
| } |
| } |
| |
| /** |
| * @param args |
| * |
| */ |
| public static void main( String[] args ) |
| { |
| String[] word={ |
| "Zero","One","Two","Three","Four","Five", |
| "Six","Seven","Eight","Nine","Ten", |
| "Eleven","Twelve","Thirteen","Fourteen","Fifteen", |
| "Sixteen","Seventeen","Eighteen","Nineteen","Twenty", |
| "Twenty-One","Twenty-Two","Twenty-Three","Twenty-Four", |
| "Twenty-Five","Twenty-Six","Twenty-Seven","Twenty-Eight", |
| "Twenty-Nine","Thirty","Thirty-One","Thirty-Two", |
| "Thirty-Three","Thirty-Four","Thirty-Five","Thirty-Six", |
| "Thirty-Seven","Thirty-Eight","Thirty-Nine"}; |
| |
| ObjectArray m_ObjectArray = new ObjectArray(); |
| // Add them in, using the default block size |
| for (int x =0; x< word.length; x++) |
| { |
| System.out.print(" - " + m_ObjectArray.append(word[x])); |
| } |
| |
| System.out.println("\n"); |
| // Now let's read them out sequentally |
| for (int x =0; x< word.length; x++) |
| { |
| String s = (String) m_ObjectArray.getAt(x); |
| System.out.println(s); |
| } |
| |
| // Some Random Access |
| System.out.println((String) m_ObjectArray.getAt(5)); |
| System.out.println((String) m_ObjectArray.getAt(10)); |
| System.out.println((String) m_ObjectArray.getAt(20)); |
| System.out.println((String) m_ObjectArray.getAt(2)); |
| System.out.println((String) m_ObjectArray.getAt(15)); |
| System.out.println((String) m_ObjectArray.getAt(30)); |
| System.out.println((String) m_ObjectArray.getAt(6)); |
| System.out.println((String) m_ObjectArray.getAt(8)); |
| |
| // Out of bounds |
| System.out.println((String) m_ObjectArray.getAt(40)); |
| |
| } |
| } |