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	/*
	* Copyright (c) 2005, 2009, 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
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/
	/*
	*******************************************************************************
	* (C) Copyright IBM Corp. and others, 1996-2009 - 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.io.InputStream;
	import java.io.DataInputStream;
	import java.io.IOException;

	/**
	* Trie implementation which stores data in char, 16 bits.
	* @author synwee
	* @see com.ibm.icu.impl.Trie
	* @since release 2.1, Jan 01 2002
	*/

	// note that i need to handle the block calculations later, since chartrie
	// in icu4c uses the same index array.
	public class CharTrie extends Trie
	{
	// public constructors ---------------------------------------------

	/**
	* <p>Creates a new Trie with the settings for the trie data.</p>
	* <p>Unserialize the 32-bit-aligned input stream and use the data for the
	* trie.</p>
	* @param inputStream file input stream to a ICU data file, containing
	* the trie
	* @param dataManipulate object which provides methods to parse the char
	* data
	* @throws IOException thrown when data reading fails
	* @draft 2.1
	*/
	public CharTrie(InputStream inputStream,
	DataManipulate dataManipulate) throws IOException
	{
	super(inputStream, dataManipulate);

	if (!isCharTrie()) {
	throw new IllegalArgumentException(
	"Data given does not belong to a char trie.");
	}
	m_friendAgent_ = new FriendAgent();
	}

	/**
	* Make a dummy CharTrie.
	* A dummy trie is an empty runtime trie, used when a real data trie cannot
	* be loaded.
	*
	* The trie always returns the initialValue,
	* or the leadUnitValue for lead surrogate code points.
	* The Latin-1 part is always set up to be linear.
	*
	* @param initialValue the initial value that is set for all code points
	* @param leadUnitValue the value for lead surrogate code _units_ that do not
	* have associated supplementary data
	* @param dataManipulate object which provides methods to parse the char data
	*/
	public CharTrie(int initialValue, int leadUnitValue, DataManipulate dataManipulate) {
	super(new char[BMP_INDEX_LENGTH+SURROGATE_BLOCK_COUNT], HEADER_OPTIONS_LATIN1_IS_LINEAR_MASK_, dataManipulate);

	int dataLength, latin1Length, i, limit;
	char block;

	/* calculate the actual size of the dummy trie data */

	/* max(Latin-1, block 0) */
	dataLength=latin1Length= INDEX_STAGE_1_SHIFT_<=8 ? 256 : DATA_BLOCK_LENGTH;
	if(leadUnitValue!=initialValue) {
	dataLength+=DATA_BLOCK_LENGTH;
	}
	m_data_=new char[dataLength];
	m_dataLength_=dataLength;

	m_initialValue_=(char)initialValue;

	/* fill the index and data arrays */

	/* indexes are preset to 0 (block 0) */

	/* Latin-1 data */
	for(i=0; i<latin1Length; ++i) {
	m_data_[i]=(char)initialValue;
	}

	if(leadUnitValue!=initialValue) {
	/* indexes for lead surrogate code units to the block after Latin-1 */
	block=(char)(latin1Length>>INDEX_STAGE_2_SHIFT_);
	i=0xd800>>INDEX_STAGE_1_SHIFT_;
	limit=0xdc00>>INDEX_STAGE_1_SHIFT_;
	for(; i<limit; ++i) {
	m_index_[i]=block;
	}

	/* data for lead surrogate code units */
	limit=latin1Length+DATA_BLOCK_LENGTH;
	for(i=latin1Length; i<limit; ++i) {
	m_data_[i]=(char)leadUnitValue;
	}
	}

	m_friendAgent_ = new FriendAgent();
	}

	/**
	* Java friend implementation
	*/
	public class FriendAgent
	{
	/**
	* Gives out the index array of the trie
	* @return index array of trie
	*/
	public char[] getPrivateIndex()
	{
	return m_index_;
	}
	/**
	* Gives out the data array of the trie
	* @return data array of trie
	*/
	public char[] getPrivateData()
	{
	return m_data_;
	}
	/**
	* Gives out the data offset in the trie
	* @return data offset in the trie
	*/
	public int getPrivateInitialValue()
	{
	return m_initialValue_;
	}
	}

	// public methods --------------------------------------------------

	/**
	* Java friend implementation
	* To store the index and data array into the argument.
	* @param friend java friend UCharacterProperty object to store the array
	*/
	public void putIndexData(UCharacterProperty friend)
	{
	friend.setIndexData(m_friendAgent_);
	}

	/**
	* Gets the value associated with the codepoint.
	* If no value is associated with the codepoint, a default value will be
	* returned.
	* @param ch codepoint
	* @return offset to data
	* @draft 2.1
	*/
	public final char getCodePointValue(int ch)
	{
	int offset;

	// fastpath for U+0000..U+D7FF
	if(0 <= ch && ch < UTF16.LEAD_SURROGATE_MIN_VALUE) {
	// copy of getRawOffset()
	offset = (m_index_[ch >> INDEX_STAGE_1_SHIFT_] << INDEX_STAGE_2_SHIFT_)
	+ (ch & INDEX_STAGE_3_MASK_);
	return m_data_[offset];
	}

	// handle U+D800..U+10FFFF
	offset = getCodePointOffset(ch);

	// return -1 if there is an error, in this case we return the default
	// value: m_initialValue_
	return (offset >= 0) ? m_data_[offset] : m_initialValue_;
	}

	/**
	* Gets the value to the data which this lead surrogate character points
	* to.
	* Returned data may contain folding offset information for the next
	* trailing surrogate character.
	* This method does not guarantee correct results for trail surrogates.
	* @param ch lead surrogate character
	* @return data value
	* @draft 2.1
	*/
	public final char getLeadValue(char ch)
	{
	return m_data_[getLeadOffset(ch)];
	}

	/**
	* Get the value associated with a pair of surrogates.
	* @param lead a lead surrogate
	* @param trail a trail surrogate
	* @draft 2.1
	*/
	public final char getSurrogateValue(char lead, char trail)
	{
	int offset = getSurrogateOffset(lead, trail);
	if (offset > 0) {
	return m_data_[offset];
	}
	return m_initialValue_;
	}

	/**
	* <p>Get a value from a folding offset (from the value of a lead surrogate)
	* and a trail surrogate.</p>
	* <p>If the
	* @param leadvalue value associated with the lead surrogate which contains
	* the folding offset
	* @param trail surrogate
	* @return trie data value associated with the trail character
	* @draft 2.1
	*/
	public final char getTrailValue(int leadvalue, char trail)
	{
	if (m_dataManipulate_ == null) {
	throw new NullPointerException(
	"The field DataManipulate in this Trie is null");
	}
	int offset = m_dataManipulate_.getFoldingOffset(leadvalue);
	if (offset > 0) {
	return m_data_[getRawOffset(offset,
	(char)(trail & SURROGATE_MASK_))];
	}
	return m_initialValue_;
	}

	// protected methods -----------------------------------------------

	/**
	* <p>Parses the input stream and stores its trie content into a index and
	* data array</p>
	* @param inputStream data input stream containing trie data
	* @exception IOException thrown when data reading fails
	*/
	protected final void unserialize(InputStream inputStream)
	throws IOException
	{
	DataInputStream input = new DataInputStream(inputStream);
	int indexDataLength = m_dataOffset_ + m_dataLength_;
	m_index_ = new char[indexDataLength];
	for (int i = 0; i < indexDataLength; i ++) {
	m_index_[i] = input.readChar();
	}
	m_data_ = m_index_;
	m_initialValue_ = m_data_[m_dataOffset_];
	}

	/**
	* Gets the offset to the data which the surrogate pair points to.
	* @param lead lead surrogate
	* @param trail trailing surrogate
	* @return offset to data
	* @draft 2.1
	*/
	protected final int getSurrogateOffset(char lead, char trail)
	{
	if (m_dataManipulate_ == null) {
	throw new NullPointerException(
	"The field DataManipulate in this Trie is null");
	}

	// get fold position for the next trail surrogate
	int offset = m_dataManipulate_.getFoldingOffset(getLeadValue(lead));

	// get the real data from the folded lead/trail units
	if (offset > 0) {
	return getRawOffset(offset, (char)(trail & SURROGATE_MASK_));
	}

	// return -1 if there is an error, in this case we return the default
	// value: m_initialValue_
	return -1;
	}

	/**
	* Gets the value at the argument index.
	* For use internally in TrieIterator.
	* @param index value at index will be retrieved
	* @return 32 bit value
	* @see com.ibm.icu.impl.TrieIterator
	* @draft 2.1
	*/
	protected final int getValue(int index)
	{
	return m_data_[index];
	}

	/**
	* Gets the default initial value
	* @return 32 bit value
	* @draft 2.1
	*/
	protected final int getInitialValue()
	{
	return m_initialValue_;
	}

	// private data members --------------------------------------------

	/**
	* Default value
	*/
	private char m_initialValue_;
	/**
	* Array of char data
	*/
	private char m_data_[];
	/**
	* Agent for friends
	*/
	private FriendAgent m_friendAgent_;
	}

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