/**
* Copyright (C) 2009 eXo Platform SAS.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.exoplatform.commons.utils;
import java.io.IOException;
import java.io.Writer;
import java.nio.charset.Charset;
/**
* Represents text that can have several internal representations in order to minimize serialization when it is possible. The
* bytes returned by the byte oriented method must returned the data encoded with the UTF-8 encoding.
*
* @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
* @version $Revision$
*/
public abstract class Text {
/**
* Create a text object from the provided byte array.
*
* @param bytes the markup as bytes
* @param charset the charset
* @return the text object
* @throws IllegalArgumentException if the bytes is null
*/
public static Text create(byte[] bytes, Charset charset) throws IllegalArgumentException {
return new Bytes(bytes, charset);
}
/**
* Create a text object from the provided char array.
*
* @param chars the markup as bytes
* @return the text object
* @throws IllegalArgumentException if the chars is null
*/
public static Text create(char[] chars) throws IllegalArgumentException {
return new Chars(chars);
}
/**
* Create a text object from the provided char array.
*
* @param s the markup as bytes
* @return the text object
* @throws IllegalArgumentException if the string is null
*/
public static Text create(String s) throws IllegalArgumentException {
return new Chars(s.toCharArray());
}
public abstract void writeTo(Writer writer) throws IOException;
private static class Bytes extends Text {
/** . */
private final byte[] bytes;
/** . */
private final Charset charset;
/** . */
private volatile String s;
private Bytes(byte[] bytes, Charset charset) {
this.bytes = bytes;
this.charset = charset;
}
public void writeTo(Writer writer) throws IOException {
if (writer instanceof BinaryOutput) {
BinaryOutput osw = (BinaryOutput) writer;
if (charset.equals(osw.getCharset())) {
osw.write(bytes);
return;
}
}
if (s == null) {
s = new String(bytes, charset.name());
}
writer.append(s);
}
}
private static class Chars extends Text {
/** Inclusive from index. */
private int offset;
/** Count. */
private int count;
/** The chars. */
private char[] chars;
private Chars(char[] chars) {
this.chars = chars;
this.offset = 0;
this.count = chars.length;
}
private Chars(char[] chars, int offset, int count) {
this.chars = chars;
this.offset = offset;
this.count = count;
}
public void writeTo(Writer writer) throws IOException {
writer.write(chars, offset, count);
}
@Override
public String toString() {
return new String(chars, offset, count);
}
}
}