/*
 * Copyright (c) 2005, 2020, 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 jdk_internal.icu.impl;

import jdk_internal.bidi.CharacterIterator;
import jdk_internal.icu.text.UCharacterIterator;

/**
 * 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);
	}

	/**
	 * @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
		}
	}
}