464 lines
10 KiB
Java
464 lines
10 KiB
Java
/* Copyright (C) 1998, 1999, 2000 Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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package java.util;
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import java.io.Serializable;
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/**
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* @author Warren Levy <warrenl@cygnus.com>
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* @date August 17, 1998.
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*/
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/* Written using "Java Class Libraries", 2nd edition, ISBN 0-201-31002-3
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* "The Java Language Specification", ISBN 0-201-63451-1
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* plus online API docs for JDK 1.2 beta from http://www.javasoft.com.
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* Status: Believed complete and correct
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*/
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final class VectorEnumeration implements Enumeration
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{
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private int enumIndex;
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private Vector enumVec;
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public VectorEnumeration(Vector vec)
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{
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enumVec = vec;
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enumIndex = 0;
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}
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public boolean hasMoreElements()
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{
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return enumIndex < enumVec.size();
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}
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public Object nextElement()
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{
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if (! (enumIndex < enumVec.size()))
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throw new NoSuchElementException();
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return enumVec.elementData[enumIndex++];
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}
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}
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// TODO12:
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// public class Vector extends AbstractList
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// implements List, Cloneable, Serializable
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public class Vector implements Cloneable, Serializable
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{
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/* The size of the increment to use when growing this vector.
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The default of 0 means to double the capacity when growing. */
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protected int capacityIncrement;
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/* The number of elements currently in elementData */
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protected int elementCount;
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/* The buffer in which elements of this vector are stored */
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protected Object[] elementData;
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private static final long serialVersionUID = -2767605614048989439L;
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public Vector()
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{
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this(10, 0);
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}
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public Vector(int initCap)
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{
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this(initCap, 0);
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}
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public Vector(int initCap, int capIncrement)
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{
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if (initCap < 0)
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throw new IllegalArgumentException ();
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elementData = new Object[initCap];
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capacityIncrement = capIncrement;
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elementCount = 0;
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}
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public final synchronized void addElement(Object obj)
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{
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// Make sure there's room for a new element
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if (elementCount == elementData.length)
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ensureCapacity(elementCount+1);
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elementData[elementCount++] = obj;
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}
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public final int capacity()
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{
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return elementData.length;
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}
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public synchronized Object clone()
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{
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// New vector needs to have same size, capacity and capacityIncrement
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Vector newVec = new Vector(elementData.length, capacityIncrement);
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System.arraycopy(elementData, 0, newVec.elementData, 0, elementCount);
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newVec.elementCount = elementCount;
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return newVec;
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}
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public final boolean contains(Object obj)
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{
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for (int i = 0; i < elementCount; i++)
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{
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if (obj == null
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? elementData[i] == null
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: obj.equals(elementData[i]))
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return true;
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}
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return false;
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}
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public final synchronized void copyInto(Object[] objArray)
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{
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System.arraycopy(elementData, 0, objArray, 0, elementCount);
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}
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public final synchronized Object elementAt(int idx)
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{
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if (idx < 0 || idx >= size())
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throw new ArrayIndexOutOfBoundsException();
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return elementData[idx];
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}
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public final synchronized Enumeration elements()
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{
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return new VectorEnumeration(this);
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}
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public final synchronized void ensureCapacity(int minCap)
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{
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// Increasing the vector could make it much larger than minCap;
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// e.g. if minCap is just larger than the vector, size may double.
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// If someone cares about this possibility they should set capacityIncrement
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if (minCap > elementData.length)
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{
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// Increase the vector; double it if capacityIncrement is zero
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int newSize = elementData.length;
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newSize +=
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(capacityIncrement > 0) ? capacityIncrement : elementData.length;
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// Make sure newSize is at least minCap
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if (newSize < minCap)
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newSize = minCap;
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Object[] newArray = new Object[newSize];
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System.arraycopy(elementData, 0, newArray, 0, elementCount);
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elementData = newArray;
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}
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}
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public final synchronized Object firstElement()
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{
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if (elementCount == 0)
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throw new NoSuchElementException();
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return elementData[0];
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}
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public final int indexOf(Object obj)
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{
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return indexOf(obj, 0);
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}
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public final synchronized int indexOf(Object obj, int idx)
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{
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if (idx < 0)
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throw new IllegalArgumentException ();
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for (int i = idx; i < elementCount; i++)
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{
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if (obj == null
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? elementData[i] == null
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: obj.equals(elementData[i]))
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return i;
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}
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return -1;
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}
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public final synchronized void insertElementAt(Object obj, int idx)
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{
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if (idx < 0 || idx > size())
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throw new ArrayIndexOutOfBoundsException();
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else if (idx == size()) // Spec says just use addElement()
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addElement(obj);
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else
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{
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// Make sure there's room for a new element
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if (elementCount == elementData.length)
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ensureCapacity(elementCount+1);
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// Shift the existing elements up and increment elementCount
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for (int i = elementCount++; i > idx; --i)
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elementData[i] = elementData[i-1];
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elementData[idx] = obj;
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}
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}
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public final boolean isEmpty()
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{
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return elementCount == 0;
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}
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public final synchronized Object lastElement()
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{
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if (elementCount == 0)
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throw new NoSuchElementException();
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return elementData[elementCount - 1];
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}
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public final int lastIndexOf(Object obj)
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{
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return lastIndexOf(obj, size()-1);
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}
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public final synchronized int lastIndexOf(Object obj, int idx)
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{
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if (idx < 0)
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throw new IllegalArgumentException ();
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for (int i = idx; i >= 0; --i)
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{
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if (obj == null
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? elementData[i] == null
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: obj.equals(elementData[i]))
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return i;
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}
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return -1;
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}
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public final synchronized void removeAllElements()
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{
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// Remove elements now to assist the gc in early cleanup
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for (int i = elementCount-1; i >= 0; --i)
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elementData[i] = null;
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elementCount = 0;
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}
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public final synchronized boolean removeElement(Object obj)
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{
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for (int i = 0; i < elementCount; i++)
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{
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if (obj == null
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? elementData[i] == null
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: obj.equals(elementData[i]))
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{
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int j;
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// Decrement count first to ensure we don't walk off end of array
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--elementCount;
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for (j = i; j < elementCount; j++)
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elementData[j] = elementData[j+1];
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// At this point, j was incrememented and points to old last element
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// Remove element now to assist the gc in early cleanup
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elementData[j] = null;
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return true;
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}
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}
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return false;
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}
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public final synchronized void removeElementAt(int idx)
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{
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int i;
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if (idx < 0 || idx >= size())
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throw new ArrayIndexOutOfBoundsException();
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// Decrement count first to ensure we don't walk off the end of the array
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--elementCount;
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for (i = idx; i < elementCount; i++)
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elementData[i] = elementData[i+1];
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// At this point, i was incrememented and now points to the old last element
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// Remove element now to assist the gc in early cleanup
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elementData[i] = null;
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}
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public final synchronized void setElementAt(Object obj, int idx)
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{
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if (idx < 0 || idx >= size())
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throw new ArrayIndexOutOfBoundsException();
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elementData[idx] = obj;
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}
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public final synchronized void setSize(int newSize)
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{
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if (newSize < 0)
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throw new ArrayIndexOutOfBoundsException();
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// Java Lang Spec p. 658 says to remove the excess elements and discard
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// when new size is smaller than old size.
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// When truncating, we could alternatively just reset elementCount instead
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// of freeing up the memory if the spec hadn't specified. The spec makes
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// sense though; if someone cares enough to call a setSize() function
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// they probably are doing so to free memory.
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if (newSize < elementCount)
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{
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elementCount = newSize;
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trimToSize();
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}
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else if (newSize > elementCount) // Skip == case
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{
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// TBD: ensureCapacity() may create a vector much larger than newSize;
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// do we want to make the vector exactly newSize? Spec is unclear.
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ensureCapacity(newSize);
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// Make sure to null out new elements of grown vector
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for (int i = elementCount; i < newSize; i++)
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elementData[i] = null;
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elementCount = newSize;
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}
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}
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public final int size()
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{
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return elementCount;
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}
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public final synchronized String toString()
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{
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// Following the Java Lang Spec p. 656
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// Prepend first element with open bracket
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StringBuffer result = new StringBuffer("[");
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if (elementCount > 0) // add first element if one exists
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result.append(elementData[0].toString());
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// Prepend subsequent elements with ", "
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for (int i = 1; i < elementCount; i++)
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result.append(", ").append(elementData[i].toString());
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// Append last element with closing bracket
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result.append("]");
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return result.toString();
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}
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public final synchronized void trimToSize()
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{
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// Give up excess storage capacity to save memory
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//
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// Don't bother checking for the case where size() == the capacity of the
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// vector since that is a much less likely case; it's more efficient to
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// not do the check and lose a bit of performance in that infrequent case
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Object[] newArray = new Object[elementCount];
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System.arraycopy(elementData, 0, newArray, 0, elementCount);
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elementData = newArray;
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}
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// TODO12:
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// public Vector(Collection c)
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// {
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// }
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// TODO12:
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// public public boolean add(Object o)
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// {
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// }
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// TODO12:
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// public void add(int index, Object element)
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// {
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// }
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// TODO12:
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// public boolean addAll(Collection c)
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// {
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// }
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// TODO12:
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// public boolean addAll(int index, Collection c)
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// {
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// }
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// TODO12:
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// public void clear()
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// {
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// }
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// TODO12:
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// public boolean containsAll(Collection c)
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// {
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// }
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// TODO12:
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// public boolean equals(Object o)
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// {
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// }
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// TODO12:
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// public int hashCode()
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// {
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// }
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// TODO12:
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// public Object get(int index)
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// {
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// }
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public synchronized boolean remove(Object o)
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{
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for (int i = 0; i < elementCount; ++i)
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{
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if (o == null
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? elementData[i] == null
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: o.equals (elementData[i]))
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{
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System.arraycopy (elementData, i, elementData, i + 1,
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elementCount - i - 1);
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return true;
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}
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}
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return false;
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}
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// TODO12:
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// public Object remove(int index)
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// {
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// }
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// TODO12:
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// public boolean removeAll(Collection c)
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// {
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// }
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// TODO12:
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// public boolean retainAll(Collection c)
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// {
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// }
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// TODO12:
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// public Object set(int index, Object element)
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// {
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// }
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// TODO12:
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// public Object[] toArray()
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// {
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// }
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// TODO12:
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// public Object[] toArray(Object[] a)
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// {
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// }
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}
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