| /* |
| * 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: IntVector.java 468655 2006-10-28 07:12:06Z minchau $ |
| */ |
| package org.apache.xml.utils; |
| |
| /** |
| * A very simple table that stores a list of int. |
| * |
| * This version is based on a "realloc" strategy -- a simle array is |
| * used, and when more storage is needed, a larger array is obtained |
| * and all existing data is recopied into it. As a result, read/write |
| * access to existing nodes is O(1) fast but appending may be O(N**2) |
| * slow. See also SuballocatedIntVector. |
| * @xsl.usage internal |
| */ |
| public class IntVector implements Cloneable |
| { |
| |
| /** Size of blocks to allocate */ |
| protected int m_blocksize; |
| |
| /** Array of ints */ |
| protected int m_map[]; // IntStack is trying to see this directly |
| |
| /** Number of ints in array */ |
| protected int m_firstFree = 0; |
| |
| /** Size of array */ |
| protected int m_mapSize; |
| |
| /** |
| * Default constructor. Note that the default |
| * block size is very small, for small lists. |
| */ |
| public IntVector() |
| { |
| |
| m_blocksize = 32; |
| m_mapSize = m_blocksize; |
| m_map = new int[m_blocksize]; |
| } |
| |
| /** |
| * Construct a IntVector, using the given block size. |
| * |
| * @param blocksize Size of block to allocate |
| */ |
| public IntVector(int blocksize) |
| { |
| |
| m_blocksize = blocksize; |
| m_mapSize = blocksize; |
| m_map = new int[blocksize]; |
| } |
| |
| /** |
| * Construct a IntVector, using the given block size. |
| * |
| * @param blocksize Size of block to allocate |
| */ |
| public IntVector(int blocksize, int increaseSize) |
| { |
| |
| m_blocksize = increaseSize; |
| m_mapSize = blocksize; |
| m_map = new int[blocksize]; |
| } |
| |
| /** |
| * Copy constructor for IntVector |
| * |
| * @param v Existing IntVector to copy |
| */ |
| public IntVector(IntVector v) |
| { |
| m_map = new int[v.m_mapSize]; |
| m_mapSize = v.m_mapSize; |
| m_firstFree = v.m_firstFree; |
| m_blocksize = v.m_blocksize; |
| System.arraycopy(v.m_map, 0, m_map, 0, m_firstFree); |
| } |
| |
| /** |
| * Get the length of the list. |
| * |
| * @return length of the list |
| */ |
| public final int size() |
| { |
| return m_firstFree; |
| } |
| |
| /** |
| * Get the length of the list. |
| * |
| * @return length of the list |
| */ |
| public final void setSize(int sz) |
| { |
| m_firstFree = sz; |
| } |
| |
| |
| /** |
| * Append a int onto the vector. |
| * |
| * @param value Int to add to the list |
| */ |
| public final void addElement(int value) |
| { |
| |
| if ((m_firstFree + 1) >= m_mapSize) |
| { |
| m_mapSize += m_blocksize; |
| |
| int newMap[] = new int[m_mapSize]; |
| |
| System.arraycopy(m_map, 0, newMap, 0, m_firstFree + 1); |
| |
| m_map = newMap; |
| } |
| |
| m_map[m_firstFree] = value; |
| |
| m_firstFree++; |
| } |
| |
| /** |
| * Append several int values onto the vector. |
| * |
| * @param value Int to add to the list |
| */ |
| public final void addElements(int value, int numberOfElements) |
| { |
| |
| if ((m_firstFree + numberOfElements) >= m_mapSize) |
| { |
| m_mapSize += (m_blocksize+numberOfElements); |
| |
| int newMap[] = new int[m_mapSize]; |
| |
| System.arraycopy(m_map, 0, newMap, 0, m_firstFree + 1); |
| |
| m_map = newMap; |
| } |
| |
| for (int i = 0; i < numberOfElements; i++) |
| { |
| m_map[m_firstFree] = value; |
| m_firstFree++; |
| } |
| } |
| |
| /** |
| * Append several slots onto the vector, but do not set the values. |
| * |
| * @param numberOfElements Int to add to the list |
| */ |
| public final void addElements(int numberOfElements) |
| { |
| |
| if ((m_firstFree + numberOfElements) >= m_mapSize) |
| { |
| m_mapSize += (m_blocksize+numberOfElements); |
| |
| int newMap[] = new int[m_mapSize]; |
| |
| System.arraycopy(m_map, 0, newMap, 0, m_firstFree + 1); |
| |
| m_map = newMap; |
| } |
| |
| m_firstFree += numberOfElements; |
| } |
| |
| |
| /** |
| * Inserts the specified node in this vector at the specified index. |
| * Each component in this vector with an index greater or equal to |
| * the specified index is shifted upward to have an index one greater |
| * than the value it had previously. |
| * |
| * @param value Int to insert |
| * @param at Index of where to insert |
| */ |
| public final void insertElementAt(int value, int at) |
| { |
| |
| if ((m_firstFree + 1) >= m_mapSize) |
| { |
| m_mapSize += m_blocksize; |
| |
| int newMap[] = new int[m_mapSize]; |
| |
| System.arraycopy(m_map, 0, newMap, 0, m_firstFree + 1); |
| |
| m_map = newMap; |
| } |
| |
| if (at <= (m_firstFree - 1)) |
| { |
| System.arraycopy(m_map, at, m_map, at + 1, m_firstFree - at); |
| } |
| |
| m_map[at] = value; |
| |
| m_firstFree++; |
| } |
| |
| /** |
| * Inserts the specified node in this vector at the specified index. |
| * Each component in this vector with an index greater or equal to |
| * the specified index is shifted upward to have an index one greater |
| * than the value it had previously. |
| */ |
| public final void removeAllElements() |
| { |
| |
| for (int i = 0; i < m_firstFree; i++) |
| { |
| m_map[i] = java.lang.Integer.MIN_VALUE; |
| } |
| |
| m_firstFree = 0; |
| } |
| |
| /** |
| * Removes the first occurrence of the argument from this vector. |
| * If the object is found in this vector, each component in the vector |
| * with an index greater or equal to the object's index is shifted |
| * downward to have an index one smaller than the value it had |
| * previously. |
| * |
| * @param s Int to remove from array |
| * |
| * @return True if the int was removed, false if it was not found |
| */ |
| public final boolean removeElement(int s) |
| { |
| |
| for (int i = 0; i < m_firstFree; i++) |
| { |
| if (m_map[i] == s) |
| { |
| if ((i + 1) < m_firstFree) |
| System.arraycopy(m_map, i + 1, m_map, i - 1, m_firstFree - i); |
| else |
| m_map[i] = java.lang.Integer.MIN_VALUE; |
| |
| m_firstFree--; |
| |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| /** |
| * Deletes the component at the specified index. Each component in |
| * this vector with an index greater or equal to the specified |
| * index is shifted downward to have an index one smaller than |
| * the value it had previously. |
| * |
| * @param i index of where to remove and int |
| */ |
| public final void removeElementAt(int i) |
| { |
| |
| if (i > m_firstFree) |
| System.arraycopy(m_map, i + 1, m_map, i, m_firstFree); |
| else |
| m_map[i] = java.lang.Integer.MIN_VALUE; |
| |
| m_firstFree--; |
| } |
| |
| /** |
| * Sets the component at the specified index of this vector to be the |
| * specified object. The previous component at that position is discarded. |
| * |
| * The index must be a value greater than or equal to 0 and less |
| * than the current size of the vector. |
| * |
| * @param value object to set |
| * @param index Index of where to set the object |
| */ |
| public final void setElementAt(int value, int index) |
| { |
| m_map[index] = value; |
| } |
| |
| /** |
| * Get the nth element. |
| * |
| * @param i index of object to get |
| * |
| * @return object at given index |
| */ |
| public final int elementAt(int i) |
| { |
| return m_map[i]; |
| } |
| |
| /** |
| * Tell if the table contains the given node. |
| * |
| * @param s object to look for |
| * |
| * @return true if the object is in the list |
| */ |
| public final boolean contains(int s) |
| { |
| |
| for (int i = 0; i < m_firstFree; i++) |
| { |
| if (m_map[i] == s) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /** |
| * Searches for the first occurence of the given argument, |
| * beginning the search at index, and testing for equality |
| * using the equals method. |
| * |
| * @param elem object to look for |
| * @param index Index of where to begin search |
| * @return the index of the first occurrence of the object |
| * argument in this vector at position index or later in the |
| * vector; returns -1 if the object is not found. |
| */ |
| public final int indexOf(int elem, int index) |
| { |
| |
| for (int i = index; i < m_firstFree; i++) |
| { |
| if (m_map[i] == elem) |
| return i; |
| } |
| |
| return java.lang.Integer.MIN_VALUE; |
| } |
| |
| /** |
| * Searches for the first occurence of the given argument, |
| * beginning the search at index, and testing for equality |
| * using the equals method. |
| * |
| * @param elem object to look for |
| * @return the index of the first occurrence of the object |
| * argument in this vector at position index or later in the |
| * vector; returns -1 if the object is not found. |
| */ |
| public final int indexOf(int elem) |
| { |
| |
| for (int i = 0; i < m_firstFree; i++) |
| { |
| if (m_map[i] == elem) |
| return i; |
| } |
| |
| return java.lang.Integer.MIN_VALUE; |
| } |
| |
| /** |
| * Searches for the first occurence of the given argument, |
| * beginning the search at index, and testing for equality |
| * using the equals method. |
| * |
| * @param elem Object to look for |
| * @return the index of the first occurrence of the object |
| * argument in this vector at position index or later in the |
| * vector; returns -1 if the object is not found. |
| */ |
| public final int lastIndexOf(int elem) |
| { |
| |
| for (int i = (m_firstFree - 1); i >= 0; i--) |
| { |
| if (m_map[i] == elem) |
| return i; |
| } |
| |
| return java.lang.Integer.MIN_VALUE; |
| } |
| |
| /** |
| * Returns clone of current IntVector |
| * |
| * @return clone of current IntVector |
| */ |
| public Object clone() |
| throws CloneNotSupportedException |
| { |
| return new IntVector(this); |
| } |
| |
| } |