CharacterIteratorWrapper.java

/*
 * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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/*
 *******************************************************************************
 * (C) Copyright IBM Corp. 1996-2005 - All Rights Reserved                     *
 *                                                                             *
 * The original version of this source code and documentation is copyrighted   *
 * and owned by IBM, These materials are provided under terms of a License     *
 * Agreement between IBM and Sun. This technology is protected by multiple     *
 * US and International patents. This notice and attribution to IBM may not    *
 * to removed.                                                                 *
 *******************************************************************************
 */

package sun.text.normalizer;

import java.text.CharacterIterator;

/**
 * This class is a wrapper around CharacterIterator and implements the 
 * UCharacterIterator protocol
 * @author ram
 */

public class CharacterIteratorWrapper extends UCharacterIterator {
    
    private CharacterIterator iterator;
    
    public CharacterIteratorWrapper(CharacterIterator iter){
        if(iter==null){
            throw new IllegalArgumentException();
        }
        iterator     = iter;   
    }

    /**
     * @see UCharacterIterator#current()
     */
    public int current() {
        int c = iterator.current();
        if(c==CharacterIterator.DONE){
          return DONE;
        }
        return c;
    }

    /**
     * @see UCharacterIterator#getLength()
     */
    public int getLength() {
        return (iterator.getEndIndex() - iterator.getBeginIndex());
    }

    /**
     * @see UCharacterIterator#getIndex()
     */
    public int getIndex() {
        return iterator.getIndex();
    }

    /**
     * @see UCharacterIterator#next()
     */
    public int next() {
        int i = iterator.current();
        iterator.next();
        if(i==CharacterIterator.DONE){  
          return DONE;
        }
        return i;
    }

    /**
     * @see UCharacterIterator#previous()
     */
    public int previous() {
        int i = iterator.previous();
        if(i==CharacterIterator.DONE){
            return DONE;
        }
        return i;
    }

    /**
     * @see UCharacterIterator#setIndex(int)
     */
    public void setIndex(int index) {
        iterator.setIndex(index);
    }

    //// for StringPrep
    /**
     * @see UCharacterIterator#getText(char[])
     */
    public int getText(char[] fillIn, int offset){
        int length =iterator.getEndIndex() - iterator.getBeginIndex(); 
        int currentIndex = iterator.getIndex();
        if(offset < 0 || offset + length > fillIn.length){
            throw new IndexOutOfBoundsException(Integer.toString(length));
        }
    
        for (char ch = iterator.first(); ch != CharacterIterator.DONE; ch = iterator.next()) {
            fillIn[offset++] = ch;
        }
        iterator.setIndex(currentIndex);

        return length;
    }

    /**
     * Creates a clone of this iterator.  Clones the underlying character iterator.
     * @see UCharacterIterator#clone()
     */
    public Object clone(){
        try {
            CharacterIteratorWrapper result = (CharacterIteratorWrapper) super.clone();
            result.iterator = (CharacterIterator)this.iterator.clone();
            return result;
        } catch (CloneNotSupportedException e) {      
            return null; // only invoked if bad underlying character iterator
        }
    }
}