- /*
- * The Apache Software License, Version 1.1
- *
- *
- * Copyright (c) 1999-2002 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution,
- * if any, must include the following acknowledgment:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself,
- * if and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "Xerces" and "Apache Software Foundation" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache",
- * nor may "Apache" appear in their name, without prior written
- * permission of the Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation and was
- * originally based on software copyright (c) 2002, International
- * Business Machines, Inc., http://www.apache.org. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- */
-
- 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 1.2 2002/08/09 15:18:19 neilg 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;
- } // <init>(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 <code>hash(char[],int,int)</code> 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 <code>hash(String)</code> 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