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/*
* Copyright (c) 2025, 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.
*
* 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.
*/
package provider;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CoderResult;
import java.nio.charset.spi.CharsetProvider;
import java.util.Collections;
import java.util.Iterator;
// A test charset provider that decodes every input byte into its uppercase
public class UppercasingCharsetProvider extends CharsetProvider {
@Override
public Iterator charsets() {
return Collections.singleton(new UppercasingCharsetProvider.UppercasingCharset()).iterator();
}
@Override
public Charset charsetForName(String charsetName) {
if (charsetName.equals("Uppercasing")) {
return new UppercasingCharsetProvider.UppercasingCharset();
} else {
return null;
}
}
public static class UppercasingCharset extends Charset {
public UppercasingCharset() {
super("Uppercasing", null);
}
@Override
public boolean contains(Charset cs) {
return false;
}
@Override
public CharsetDecoder newDecoder() {
return new UppercasingCharsetDecoder(this, 1, 1);
}
@Override
public CharsetEncoder newEncoder() {
return null;
}
}
private static class UppercasingCharsetDecoder extends CharsetDecoder {
public UppercasingCharsetDecoder(Charset cs, float averageCharsPerByte, float maxCharsPerByte) {
super(cs, averageCharsPerByte, maxCharsPerByte);
}
@Override
protected CoderResult decodeLoop(ByteBuffer in, CharBuffer out) {
while (in.remaining() > 0) {
out.put(Character.toUpperCase((char)in.get()));
}
return CoderResult.UNDERFLOW;
}
}
}
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