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/*
* ====================================================================
* Project: openMDX/Core, http://www.openmdx.org/
* Description: Standard String Source
* Owner: OMEX AG, Switzerland, http://www.omex.ch
* ====================================================================
*
* This software is published under the BSD license as listed below.
*
* Copyright (c) 2013, OMEX AG, Switzerland
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of the openMDX team nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* ------------------
*
* This product includes software developed by other organizations as
* listed in the NOTICE file.
*/
package org.openmdx.base.wbxml;
import java.io.EOFException;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.util.Arrays;
import java.util.List;
import java.util.SortedMap;
import java.util.TreeMap;
import org.openmdx.base.exception.ServiceException;
import org.openmdx.kernel.log.SysLog;
/**
* Standard String Source
*/
public class StandardStringSource implements StringSource {
/**
* Constructor
*
* @param charset the encoding
* @param in the string table content
* @param byteCount the string table size
* @throws ServiceException
*/
StandardStringSource(
Charset charset,
InputStream in,
int byteCount
) throws IOException {
if(!isSupported(charset)) throw new UnsupportedEncodingException(
"The StandardStringSource supports the following character sets only: " + SUPPORTED_CHARACTER_SETS
);
this.charset = charset;
this.content = new TreeMap();
populate(in, byteCount);
}
/**
* The character set to be used
*/
private final Charset charset;
/**
* The slice size
*/
private final static int SLICE_SIZE = 1024;
/**
* The string table's character content is amended over time
*/
protected final SortedMap content;
/**
* The supported character sets
*/
protected final static List SUPPORTED_CHARACTER_SETS = Arrays.asList(
"UTF-8",
"ASCII"
);
/**
* Tells whether the given character set is supported
*
* @param charset
*
* @return true if the given character set is supported
*/
public static boolean isSupported(
Charset charset
){
return SUPPORTED_CHARACTER_SETS.contains(charset.name());
}
/**
* Populate the string table with its basic entries
*
* @throws IOException
*/
private void populate(
InputStream in,
int tableSize
) throws IOException {
final CharsetDecoder decoder = charset.newDecoder();
final byte[] binaryData = new byte[SLICE_SIZE];
final char[] characterData = new char[SLICE_SIZE];
final CharBuffer characterBuffer = CharBuffer.wrap(characterData);
ByteBuffer binaryBuffer = ByteBuffer.wrap(binaryData);
final StringBuilder value = new StringBuilder();
int tableIndex = 0;
int valueStart = 0;
int valueSize = 0;
boolean ascii = true;
while(tableSize > tableIndex){
int remaining = tableSize - tableIndex;
int sliceLimit = in.read(binaryData, 0, remaining > SLICE_SIZE ? SLICE_SIZE : remaining);
if(sliceLimit < 0) {
throw new EOFException(
"Missing bytes for string table, expected " + tableSize + "bytes, found " + tableIndex
);
}
int sliceStart = 0;
for(int sliceIndex = 0; sliceIndex < sliceLimit; sliceIndex++) {
int character = binaryData[sliceIndex] & 0x000000ff;
if(character == 0) { // end of value
Integer key = Integer.valueOf(valueStart);
int sliceSize = sliceIndex - sliceStart;
if(ascii && value.length() == 0) {
this.content.put(key, String.copyValueOf(characterData, sliceStart, sliceSize));
} else {
if(ascii) {
value.append(characterData, sliceStart, sliceSize);
} else {
decoder.reset().decode(
(ByteBuffer)binaryBuffer.position(sliceStart).limit(sliceIndex),
(CharBuffer) characterBuffer.reset(),
true
);
value.append(characterBuffer.flip());
}
content.put(key, value.toString());
}
valueSize += sliceSize;
sliceStart = sliceIndex + 1;
value.setLength(0);
valueStart += valueSize + 1;
valueSize = 0;
} else if (character < 128) { // stay in ASCII mode
characterData[sliceIndex] = (char) character;
} else if (ascii){ // Switch to non-ASCII
int sliceSize = sliceIndex - sliceStart;
value.append(characterData, sliceStart, sliceSize);
valueSize += sliceSize;
sliceStart = sliceIndex;
ascii = false;
}
}
{
int sliceSize = sliceLimit - sliceStart;
if(ascii) {
value.append(characterData, sliceStart, sliceSize);
} else {
decoder.decode(
(ByteBuffer) binaryBuffer.position(sliceStart).limit(sliceLimit),
(CharBuffer) characterBuffer.reset(),
false
);
value.append(characterBuffer.flip());
}
valueSize += sliceSize;
}
tableIndex += sliceLimit;
}
SysLog.detail("WBXML String table loaded", tableSize + " bytes");
}
/**
* Retrieve a sub-string
*
* @param index
*
* @return the requested sub-string
*/
private String getSubString(
Integer index
){
Integer superKey = this.content.headMap(index).lastKey();
String superValue = this.content.get(superKey);
int offset = index.intValue() - superKey.intValue();
for(int i = 0; i < offset; i++) {
if(superValue.charAt(i) >= 128) {
// non-ASCII prefix
byte[] binaryContent = superValue.getBytes(this.charset);
return this.charset.decode(ByteBuffer.wrap(binaryContent, offset, binaryContent.length - offset)).toString();
}
}
// ASCII prefix
return superValue.substring(offset);
}
/* (non-Javadoc)
* @see org.openmdx.base.wbxml.StringSource#resolveString(int)
*/
@Override
public String resolveString(int index) {
Integer key = Integer.valueOf(index);
String value = this.content.get(key);
if(value == null) {
this.content.put(
key,
value = getSubString(key)
);
}
return value;
}
}
