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package com.sun.org.apache.xerces.internal.util;
/**
* Shadowed symbol table.
*
* The table has a reference to the main symbol table and is
* not allowed to add new symbols to the main symbol table.
* New symbols are added to the shadow symbol table and are local
* to the component using this table.
*
* @author Andy Clark IBM
* @version $Id: ShadowedSymbolTable.java,v 1.6 2010-11-01 04:40:14 joehw Exp $
*/
public final class ShadowedSymbolTable
extends SymbolTable {
//
// Data
//
/** Main symbol table. */
protected SymbolTable fSymbolTable;
//
// Constructors
//
/** Constructs a shadow of the specified symbol table. */
public ShadowedSymbolTable(SymbolTable symbolTable) {
fSymbolTable = symbolTable;
} // (SymbolTable)
//
// SymbolTable methods
//
/**
* Adds the specified symbol to the symbol table and returns a
* reference to the unique symbol. If the symbol already exists,
* the previous symbol reference is returned instead, in order
* guarantee that symbol references remain unique.
*
* @param symbol The new symbol.
*/
public String addSymbol(String symbol) {
if (fSymbolTable.containsSymbol(symbol)) {
return fSymbolTable.addSymbol(symbol);
}
return super.addSymbol(symbol);
} // addSymbol(String)
/**
* Adds the specified symbol to the symbol table and returns a
* reference to the unique symbol. If the symbol already exists,
* the previous symbol reference is returned instead, in order
* guarantee that symbol references remain unique.
*
* @param buffer The buffer containing the new symbol.
* @param offset The offset into the buffer of the new symbol.
* @param length The length of the new symbol in the buffer.
*/
public String addSymbol(char[] buffer, int offset, int length) {
if (fSymbolTable.containsSymbol(buffer, offset, length)) {
return fSymbolTable.addSymbol(buffer, offset, length);
}
return super.addSymbol(buffer, offset, length);
} // addSymbol(char[],int,int):String
/**
* Returns a hashcode value for the specified symbol. The value
* returned by this method must be identical to the value returned
* by the hash(char[],int,int) method when called
* with the character array that comprises the symbol string.
*
* @param symbol The symbol to hash.
*/
public int hash(String symbol) {
return fSymbolTable.hash(symbol);
} // hash(String):int
/**
* Returns a hashcode value for the specified symbol information.
* The value returned by this method must be identical to the value
* returned by the hash(String) method when called
* with the string object created from the symbol information.
*
* @param buffer The character buffer containing the symbol.
* @param offset The offset into the character buffer of the start
* of the symbol.
* @param length The length of the symbol.
*/
public int hash(char[] buffer, int offset, int length) {
return fSymbolTable.hash(buffer, offset, length);
} // hash(char[],int,int):int
} // class ShadowedSymbolTable