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122 lines
3.9 KiB
122 lines
3.9 KiB
/*
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* Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*/
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/*
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* Copyright 1999-2002,2004 The Apache Software Foundation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.sun.org.apache.xerces.internal.util;
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/**
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* Shadowed symbol table.
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*
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* The table has a reference to the main symbol table and is
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* not allowed to add new symbols to the main symbol table.
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* New symbols are added to the shadow symbol table and are local
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* to the component using this table.
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*
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* @author Andy Clark IBM
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*/
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public final class ShadowedSymbolTable
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extends SymbolTable {
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//
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// Data
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//
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/** Main symbol table. */
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protected SymbolTable fSymbolTable;
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//
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// Constructors
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//
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/** Constructs a shadow of the specified symbol table. */
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public ShadowedSymbolTable(SymbolTable symbolTable) {
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fSymbolTable = symbolTable;
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} // <init>(SymbolTable)
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//
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// SymbolTable methods
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//
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/**
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* Adds the specified symbol to the symbol table and returns a
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* reference to the unique symbol. If the symbol already exists,
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* the previous symbol reference is returned instead, in order
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* guarantee that symbol references remain unique.
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*
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* @param symbol The new symbol.
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*/
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public String addSymbol(String symbol) {
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if (fSymbolTable.containsSymbol(symbol)) {
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return fSymbolTable.addSymbol(symbol);
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}
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return super.addSymbol(symbol);
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} // addSymbol(String)
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/**
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* Adds the specified symbol to the symbol table and returns a
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* reference to the unique symbol. If the symbol already exists,
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* the previous symbol reference is returned instead, in order
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* guarantee that symbol references remain unique.
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*
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* @param buffer The buffer containing the new symbol.
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* @param offset The offset into the buffer of the new symbol.
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* @param length The length of the new symbol in the buffer.
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*/
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public String addSymbol(char[] buffer, int offset, int length) {
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if (fSymbolTable.containsSymbol(buffer, offset, length)) {
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return fSymbolTable.addSymbol(buffer, offset, length);
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}
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return super.addSymbol(buffer, offset, length);
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} // addSymbol(char[],int,int):String
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/**
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* Returns a hashcode value for the specified symbol. The value
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* returned by this method must be identical to the value returned
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* by the <code>hash(char[],int,int)</code> method when called
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* with the character array that comprises the symbol string.
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*
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* @param symbol The symbol to hash.
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*/
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public int hash(String symbol) {
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return fSymbolTable.hash(symbol);
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} // hash(String):int
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/**
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* Returns a hashcode value for the specified symbol information.
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* The value returned by this method must be identical to the value
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* returned by the <code>hash(String)</code> method when called
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* with the string object created from the symbol information.
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*
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* @param buffer The character buffer containing the symbol.
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* @param offset The offset into the character buffer of the start
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* of the symbol.
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* @param length The length of the symbol.
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*/
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public int hash(char[] buffer, int offset, int length) {
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return fSymbolTable.hash(buffer, offset, length);
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} // hash(char[],int,int):int
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} // class ShadowedSymbolTable
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