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Java > Open Source Codes > com > sun > org > apache > xerces > internal > util > SynchronizedSymbolTable


1 /*
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25  * if and wherever such third-party acknowledgments normally appear.
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57
58 package com.sun.org.apache.xerces.internal.util;
59
60 /**
61  * Synchronized symbol table.
62  *
63  * This class moved into the util package since it's needed by multiple
64  * other classes (CachingParserPool, XMLGrammarCachingConfiguration).
65  *
66  * @author Andy Clark, IBM
67  * @version $Id: SynchronizedSymbolTable.java,v 1.2 2002/08/09 15:18:19 neilg Exp $
68  */
69
70 public final class SynchronizedSymbolTable
71     extends SymbolTable {
72         
73     //
74 // Data
75 //
76
77     /** Main symbol table. */
78     protected SymbolTable fSymbolTable;
79
80     //
81 // Constructors
82 //
83
84     /** Constructs a synchronized symbol table. */
85     public SynchronizedSymbolTable(SymbolTable symbolTable) {
86         fSymbolTable = symbolTable;
87     } // <init>(SymbolTable)
88
89     // construct synchronized symbol table of default size
90 public SynchronizedSymbolTable() {
91         fSymbolTable = new SymbolTable();
92     } // init()
93
94     // construct synchronized symbol table of given size
95 public SynchronizedSymbolTable(int size) {
96         fSymbolTable = new SymbolTable(size);
97     } // init(int)
98
99     //
100 // SymbolTable methods
101 //
102
103     /**
104      * Adds the specified symbol to the symbol table and returns a
105      * reference to the unique symbol. If the symbol already exists,
106      * the previous symbol reference is returned instead, in order
107      * guarantee that symbol references remain unique.
108      *
109      * @param symbol The new symbol.
110      */
111     public String JavaDoc addSymbol(String JavaDoc symbol) {
112
113         synchronized (fSymbolTable) {
114             return fSymbolTable.addSymbol(symbol);
115         }
116
117     } // addSymbol(String)
118
119     /**
120      * Adds the specified symbol to the symbol table and returns a
121      * reference to the unique symbol. If the symbol already exists,
122      * the previous symbol reference is returned instead, in order
123      * guarantee that symbol references remain unique.
124      *
125      * @param buffer The buffer containing the new symbol.
126      * @param offset The offset into the buffer of the new symbol.
127      * @param length The length of the new symbol in the buffer.
128      */
129     public String JavaDoc addSymbol(char[] buffer, int offset, int length) {
130
131         synchronized (fSymbolTable) {
132             return fSymbolTable.addSymbol(buffer, offset, length);
133         }
134
135     } // addSymbol(char[],int,int):String
136
137     /**
138      * Returns true if the symbol table already contains the specified
139      * symbol.
140      *
141      * @param symbol The symbol to look for.
142      */
143     public boolean containsSymbol(String JavaDoc symbol) {
144
145         synchronized (fSymbolTable) {
146             return fSymbolTable.containsSymbol(symbol);
147         }
148
149     } // containsSymbol(String):boolean
150
151     /**
152      * Returns true if the symbol table already contains the specified
153      * symbol.
154      *
155      * @param buffer The buffer containing the symbol to look for.
156      * @param offset The offset into the buffer.
157      * @param length The length of the symbol in the buffer.
158      */
159     public boolean containsSymbol(char[] buffer, int offset, int length) {
160
161         synchronized (fSymbolTable) {
162             return fSymbolTable.containsSymbol(buffer, offset, length);
163         }
164
165     } // containsSymbol(char[],int,int):boolean
166
167 } // class SynchronizedSymbolTable
168
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