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/*
* Copyright (c) 2005, 2015, 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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*/
/*
******************************************************************************
* Copyright (C) 1996-2014, International Business Machines Corporation and
* others. All Rights Reserved.
******************************************************************************
*/
package sun.text.normalizer;
import java.io.DataInputStream;
import java.io.InputStream;
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 ---------------------------------------------
/**
* Creates a new Trie with the settings for the trie data.
* Unserialize the 32-bit-aligned input stream and use the data for the
* trie.
* @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.");
}
}
// public methods --------------------------------------------------
/**
* 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
*/
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
*/
public final char getLeadValue(char ch)
{
return m_data_[getLeadOffset(ch)];
}
// protected methods -----------------------------------------------
/**
* Parses the input stream and stores its trie content into a index and
* data array
* @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;
}
// private data members --------------------------------------------
/**
* Default value
*/
private char m_initialValue_;
/**
* Array of char data
*/
private char m_data_[];
}