| /* |
| * 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.xml.utils; |
| |
| /** |
| * A very simple table that stores a list of strings, optimized |
| * for small lists. |
| * @xsl.usage internal |
| */ |
| public class StringVector implements java.io.Serializable |
| { |
| static final long serialVersionUID = 4995234972032919748L; |
| |
| /** @serial Size of blocks to allocate */ |
| protected int m_blocksize; |
| |
| /** @serial Array of strings this contains */ |
| protected String m_map[]; |
| |
| /** @serial Number of strings this contains */ |
| protected int m_firstFree = 0; |
| |
| /** @serial Size of the array */ |
| protected int m_mapSize; |
| |
| /** |
| * Default constructor. Note that the default |
| * block size is very small, for small lists. |
| */ |
| public StringVector() |
| { |
| |
| m_blocksize = 8; |
| m_mapSize = m_blocksize; |
| m_map = new String[m_blocksize]; |
| } |
| |
| /** |
| * Construct a StringVector, using the given block size. |
| * |
| * @param blocksize Size of the blocks to allocate |
| */ |
| public StringVector(int blocksize) |
| { |
| |
| m_blocksize = blocksize; |
| m_mapSize = blocksize; |
| m_map = new String[blocksize]; |
| } |
| |
| /** |
| * Get the length of the list. |
| * |
| * @return Number of strings in the list |
| */ |
| public int getLength() |
| { |
| return m_firstFree; |
| } |
| |
| /** |
| * Get the length of the list. |
| * |
| * @return Number of strings in the list |
| */ |
| public final int size() |
| { |
| return m_firstFree; |
| } |
| |
| /** |
| * Append a string onto the vector. |
| * |
| * @param value Sting to add to the vector |
| */ |
| public final void addElement(String value) |
| { |
| |
| if ((m_firstFree + 1) >= m_mapSize) |
| { |
| m_mapSize += m_blocksize; |
| |
| String newMap[] = new String[m_mapSize]; |
| |
| System.arraycopy(m_map, 0, newMap, 0, m_firstFree + 1); |
| |
| m_map = newMap; |
| } |
| |
| m_map[m_firstFree] = value; |
| |
| m_firstFree++; |
| } |
| |
| /** |
| * Get the nth element. |
| * |
| * @param i Index of string to find |
| * |
| * @return String at given index |
| */ |
| public final String elementAt(int i) |
| { |
| return m_map[i]; |
| } |
| |
| /** |
| * Tell if the table contains the given string. |
| * |
| * @param s String to look for |
| * |
| * @return True if the string is in this table |
| */ |
| public final boolean contains(String s) |
| { |
| |
| if (null == s) |
| return false; |
| |
| for (int i = 0; i < m_firstFree; i++) |
| { |
| if (m_map[i].equals(s)) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /** |
| * Tell if the table contains the given string. Ignore case. |
| * |
| * @param s String to find |
| * |
| * @return True if the String is in this vector |
| */ |
| public final boolean containsIgnoreCase(String s) |
| { |
| |
| if (null == s) |
| return false; |
| |
| for (int i = 0; i < m_firstFree; i++) |
| { |
| if (m_map[i].equalsIgnoreCase(s)) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /** |
| * Tell if the table contains the given string. |
| * |
| * @param s String to push into the vector |
| */ |
| public final void push(String s) |
| { |
| |
| if ((m_firstFree + 1) >= m_mapSize) |
| { |
| m_mapSize += m_blocksize; |
| |
| String newMap[] = new String[m_mapSize]; |
| |
| System.arraycopy(m_map, 0, newMap, 0, m_firstFree + 1); |
| |
| m_map = newMap; |
| } |
| |
| m_map[m_firstFree] = s; |
| |
| m_firstFree++; |
| } |
| |
| /** |
| * Pop the tail of this vector. |
| * |
| * @return The String last added to this vector or null not found. |
| * The string is removed from the vector. |
| */ |
| public final String pop() |
| { |
| |
| if (m_firstFree <= 0) |
| return null; |
| |
| m_firstFree--; |
| |
| String s = m_map[m_firstFree]; |
| |
| m_map[m_firstFree] = null; |
| |
| return s; |
| } |
| |
| /** |
| * Get the string at the tail of this vector without popping. |
| * |
| * @return The string at the tail of this vector. |
| */ |
| public final String peek() |
| { |
| return (m_firstFree <= 0) ? null : m_map[m_firstFree - 1]; |
| } |
| } |