//
// MessagePack for Java
//
// Copyright (C) 2009 - 2013 FURUHASHI Sadayuki
//
//    Licensed under the Apache License, Version 2.0 (the "License");
//    you may not use this file except in compliance with the License.
//    You may obtain a copy of the License at
//
//        http://www.apache.org/licenses/LICENSE-2.0
//
//    Unless required by applicable law or agreed to in writing, software
//    distributed under the License is distributed on an "AS IS" BASIS,
//    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//    See the License for the specific language governing permissions and
//    limitations under the License.
//
package org.msgpack.type;

import java.util.Arrays;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CodingErrorAction;
import org.msgpack.packer.Packer;
import org.msgpack.MessageTypeException;

class ByteArrayRawValueImpl extends AbstractRawValue {
    private static ByteArrayRawValueImpl emptyInstance = new ByteArrayRawValueImpl(new byte[0], true);
    
    public static RawValue getEmptyInstance() {
        return emptyInstance;
    }
    
    private static final ThreadLocal<CharsetDecoder> decoderStore = new ThreadLocal<CharsetDecoder>() {
        @Override
        protected CharsetDecoder initialValue() {
            return Charset.forName("UTF-8").newDecoder()
                    .onMalformedInput(CodingErrorAction.REPORT)
                    .onUnmappableCharacter(CodingErrorAction.REPORT);
        }
    };

    private byte[] bytes;

    ByteArrayRawValueImpl(byte[] bytes, boolean gift) {
        if (gift) {
            this.bytes = bytes;
        } else {
            this.bytes = new byte[bytes.length];
            System.arraycopy(bytes, 0, this.bytes, 0, bytes.length);
        }
    }

    ByteArrayRawValueImpl(byte[] b, int off, int len) {
        // TODO reference
        this.bytes = new byte[len];
        System.arraycopy(b, off, this.bytes, 0, len);
    }

    @Override
    public byte[] getByteArray() {
        return bytes;
    }

    @Override
    public String getString() {
        CharsetDecoder decoder = decoderStore.get();
        try {
            return decoder.decode(ByteBuffer.wrap(bytes)).toString();
        } catch (CharacterCodingException ex) {
            throw new MessageTypeException(ex);
        }
    }

    @Override
    public void writeTo(Packer pk) throws IOException {
        pk.write(bytes);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (!(o instanceof Value)) {
            return false;
        }
        Value v = (Value) o;
        if (!v.isRawValue()) {
            return false;
        }

        return Arrays.equals(bytes, v.asRawValue().getByteArray());
    }

    @Override
    public int hashCode() {
        return Arrays.hashCode(bytes);
    }
}