src/org/eclipse/jdt/internal/compiler/util/ObjectVector.java

   1 /*******************************************************************************
   2  * Copyright (c) 2000, 2004 IBM Corporation and others.
   3  * All rights reserved. This program and the accompanying materials
   4  * are made available under the terms of the Common Public License v1.0
   5  * which accompanies this distribution, and is available at
   6  * http://www.eclipse.org/legal/cpl-v10.html
   7  *
   8  * Contributors:
   9  *     IBM Corporation - initial API and implementation
  10  *******************************************************************************/
  11 package org.eclipse.jdt.internal.compiler.util;
  12
  13 public final class ObjectVector {
  14
  15         static int INITIAL_SIZE = 10;
  16
  17         public int size;
  18         int maxSize;
  19         Object[] elements;
  20
  21         public ObjectVector() {
  22
  23                 this.maxSize = INITIAL_SIZE;
  24                 this.size = 0;
  25                 this.elements = new Object[this.maxSize];
  26         }
  27
  28         public void add(Object newElement) {
  29
  30                 if (this.size == this.maxSize) // knows that size starts <= maxSize
  31                         System.arraycopy(this.elements, 0, (this.elements = new Object[this.maxSize *= 2]), 0, this.size);
  32                 this.elements[this.size++] = newElement;
  33         }
  34
  35         public void addAll(Object[] newElements) {
  36
  37                 if (this.size + newElements.length >= this.maxSize) {
  38                         maxSize = this.size + newElements.length; // assume no more elements will be added
  39                         System.arraycopy(this.elements, 0, (this.elements = new Object[this.maxSize]), 0, this.size);
  40                 }
  41                 System.arraycopy(newElements, 0, this.elements, size, newElements.length);
  42                 this.size += newElements.length;
  43         }
  44
  45         public void addAll(ObjectVector newVector) {
  46
  47                 if (this.size + newVector.size >= this.maxSize) {
  48                         maxSize = this.size + newVector.size; // assume no more elements will be added
  49                         System.arraycopy(this.elements, 0, (this.elements = new Object[this.maxSize]), 0, this.size);
  50                 }
  51                 System.arraycopy(newVector.elements, 0, this.elements, size, newVector.size);
  52                 this.size += newVector.size;
  53         }
  54
  55         /**
  56          * Identity check
  57          */
  58         public boolean containsIdentical(Object element) {
  59
  60                 for (int i = this.size; --i >= 0;)
  61                         if (element == this.elements[i])
  62                                 return true;
  63                 return false;
  64         }
  65
  66         /**
  67          * Equality check
  68          */
  69         public boolean contains(Object element) {
  70
  71                 for (int i = this.size; --i >= 0;)
  72                         if (element.equals(this.elements[i]))
  73                                 return true;
  74                 return false;
  75         }
  76
  77         public void copyInto(Object[] targetArray){
  78
  79                 this.copyInto(targetArray, 0);
  80         }
  81
  82         public void copyInto(Object[] targetArray, int index){
  83
  84                 System.arraycopy(this.elements, 0, targetArray, index, this.size);
  85         }
  86
  87         public Object elementAt(int index) {
  88
  89                 return this.elements[index];
  90         }
  91
  92         public Object find(Object element) {
  93
  94                 for (int i = this.size; --i >= 0;)
  95                         if (element.equals(this.elements[i]))
  96                                 return element;
  97                 return null;
  98         }
  99
 100         public Object remove(Object element) {
 101
 102                 // assumes only one occurrence of the element exists
 103                 for (int i = this.size; --i >= 0;)
 104                         if (element.equals(this.elements[i])) {
 105                                 // shift the remaining elements down one spot
 106                                 System.arraycopy(this.elements, i + 1, this.elements, i, --this.size - i);
 107                                 this.elements[this.size] = null;
 108                                 return element;
 109                         }
 110                 return null;
 111         }
 112
 113         public void removeAll() {
 114
 115                 for (int i = this.size; --i >= 0;)
 116                         this.elements[i] = null;
 117                 this.size = 0;
 118         }
 119
 120         public int size(){
 121
 122                 return this.size;
 123         }
 124
 125         public String toString() {
 126
 127                 String s = ""; //$NON-NLS-1$
 128                 for (int i = 0; i < this.size; i++)
 129                         s += this.elements[i].toString() + "\n"; //$NON-NLS-1$
 130                 return s;
 131         }
 132 }