/*
* Copyright (c) 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
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*/
/*
*******************************************************************************
* (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. *
*******************************************************************************
*/
/* Written by Simon Montagu, Matitiahu Allouche
* (ported from C code written by Markus W. Scherer)
*/
package sun.text.bidi;
/**
* A BidiRun represents a sequence of characters at the same embedding level.
* The Bidi algorithm decomposes a piece of text into sequences of characters
* at the same embedding level, each such sequence is called a <quote>run</quote>.
*
* <p>A BidiRun represents such a run by storing its essential properties,
* but does not duplicate the characters which form the run.
*
* <p>The &quot;limit&quot; of the run is the position just after the
* last character, i.e., one more than that position.
*
* <p>This class has no public constructor, and its members cannot be
* modified by users.
*
* @see com.ibm.icu.text.Bidi
*/
public class BidiRun {
int start; /* first logical position of the run */
int limit; /* last visual position of the run +1 */
int insertRemove; /* if >0, flags for inserting LRM/RLM before/after run,
if <0, count of bidi controls within run */
byte level;
/*
* Default constructor
*
* Note that members start and limit of a run instance have different
* meanings depending whether the run is part of the runs array of a Bidi
* object, or if it is a reference returned by getVisualRun() or
* getLogicalRun().
* For a member of the runs array of a Bidi object,
* - start is the first logical position of the run in the source text.
* - limit is one after the last visual position of the run.
* For a reference returned by getLogicalRun() or getVisualRun(),
* - start is the first logical position of the run in the source text.
* - limit is one after the last logical position of the run.
*/
BidiRun()
{
this(0, 0, (byte)0);
}
/*
* Constructor
*/
BidiRun(int start, int limit, byte embeddingLevel)
{
this.start = start;
this.limit = limit;
this.level = embeddingLevel;
}
/*
* Copy the content of a BidiRun instance
*/
void copyFrom(BidiRun run)
{
this.start = run.start;
this.limit = run.limit;
this.level = run.level;
this.insertRemove = run.insertRemove;
}
/**
* Get level of run
*/
public byte getEmbeddingLevel()
{
return level;
}
/**
* Check if run level is even
* @return true if the embedding level of this run is even, i.e. it is a
* left-to-right run.
*/
boolean isEvenRun()
{
return (level & 1) == 0;
}
}