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//
// MessagePack for Java
//
//    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.pkl.thirdparty.msgpack.value;

import org.pkl.thirdparty.msgpack.core.MessageFormat;
import org.pkl.thirdparty.msgpack.core.MessageIntegerOverflowException;
import org.pkl.thirdparty.msgpack.core.MessagePack;
import org.pkl.thirdparty.msgpack.core.MessagePacker;
import org.pkl.thirdparty.msgpack.core.MessageStringCodingException;
import org.pkl.thirdparty.msgpack.core.MessageTypeCastException;
import org.pkl.thirdparty.msgpack.value.impl.ImmutableBigIntegerValueImpl;

import java.io.IOException;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.nio.ByteBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CodingErrorAction;
import java.time.Instant;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class Variable
        implements Value
{
    private abstract class AbstractValueAccessor
            implements Value
    {
        @Override
        public boolean isNilValue()
        {
            return getValueType().isNilType();
        }

        @Override
        public boolean isBooleanValue()
        {
            return getValueType().isBooleanType();
        }

        @Override
        public boolean isNumberValue()
        {
            return getValueType().isNumberType();
        }

        @Override
        public boolean isIntegerValue()
        {
            return getValueType().isIntegerType();
        }

        @Override
        public boolean isFloatValue()
        {
            return getValueType().isFloatType();
        }

        @Override
        public boolean isRawValue()
        {
            return getValueType().isRawType();
        }

        @Override
        public boolean isBinaryValue()
        {
            return getValueType().isBinaryType();
        }

        @Override
        public boolean isStringValue()
        {
            return getValueType().isStringType();
        }

        @Override
        public boolean isArrayValue()
        {
            return getValueType().isArrayType();
        }

        @Override
        public boolean isMapValue()
        {
            return getValueType().isMapType();
        }

        @Override
        public boolean isExtensionValue()
        {
            return getValueType().isExtensionType();
        }

        @Override
        public boolean isTimestampValue()
        {
            return false;
        }

        @Override
        public NilValue asNilValue()
        {
            throw new MessageTypeCastException();
        }

        @Override
        public BooleanValue asBooleanValue()
        {
            throw new MessageTypeCastException();
        }

        @Override
        public NumberValue asNumberValue()
        {
            throw new MessageTypeCastException();
        }

        @Override
        public IntegerValue asIntegerValue()
        {
            throw new MessageTypeCastException();
        }

        @Override
        public FloatValue asFloatValue()
        {
            throw new MessageTypeCastException();
        }

        @Override
        public RawValue asRawValue()
        {
            throw new MessageTypeCastException();
        }

        @Override
        public BinaryValue asBinaryValue()
        {
            throw new MessageTypeCastException();
        }

        @Override
        public StringValue asStringValue()
        {
            throw new MessageTypeCastException();
        }

        @Override
        public ArrayValue asArrayValue()
        {
            throw new MessageTypeCastException();
        }

        @Override
        public MapValue asMapValue()
        {
            throw new MessageTypeCastException();
        }

        @Override
        public ExtensionValue asExtensionValue()
        {
            throw new MessageTypeCastException();
        }

        @Override
        public TimestampValue asTimestampValue()
        {
            throw new MessageTypeCastException();
        }

        @Override
        public boolean equals(Object obj)
        {
            return Variable.this.equals(obj);
        }

        @Override
        public int hashCode()
        {
            return Variable.this.hashCode();
        }

        @Override
        public String toJson()
        {
            return Variable.this.toJson();
        }

        @Override
        public String toString()
        {
            return Variable.this.toString();
        }
    }

    public static enum Type
    {
        NULL(ValueType.NIL),
        BOOLEAN(ValueType.BOOLEAN),
        LONG(ValueType.INTEGER),
        BIG_INTEGER(ValueType.INTEGER),
        DOUBLE(ValueType.FLOAT),
        BYTE_ARRAY(ValueType.BINARY),
        RAW_STRING(ValueType.STRING),
        LIST(ValueType.ARRAY),
        MAP(ValueType.MAP),
        EXTENSION(ValueType.EXTENSION),
        TIMESTAMP(ValueType.EXTENSION);

        private final ValueType valueType;

        private Type(ValueType valueType)
        {
            this.valueType = valueType;
        }

        public ValueType getValueType()
        {
            return valueType;
        }
    }

    private final NilValueAccessor nilAccessor = new NilValueAccessor();
    private final BooleanValueAccessor booleanAccessor = new BooleanValueAccessor();
    private final IntegerValueAccessor integerAccessor = new IntegerValueAccessor();
    private final FloatValueAccessor floatAccessor = new FloatValueAccessor();
    private final BinaryValueAccessor binaryAccessor = new BinaryValueAccessor();
    private final StringValueAccessor stringAccessor = new StringValueAccessor();
    private final ArrayValueAccessor arrayAccessor = new ArrayValueAccessor();
    private final MapValueAccessor mapAccessor = new MapValueAccessor();
    private final ExtensionValueAccessor extensionAccessor = new ExtensionValueAccessor();
    private final TimestampValueAccessor timestampAccessor = new TimestampValueAccessor();

    private Type type;

    private long longValue;
    private double doubleValue;
    private Object objectValue;

    private AbstractValueAccessor accessor;

    public Variable()
    {
        setNilValue();
    }

    ////
    // NilValue
    //

    public Variable setNilValue()
    {
        this.type = Type.NULL;
        this.accessor = nilAccessor;
        return this;
    }

    private class NilValueAccessor
            extends AbstractValueAccessor
            implements NilValue
    {
        @Override
        public ValueType getValueType()
        {
            return ValueType.NIL;
        }

        @Override
        public NilValue asNilValue()
        {
            return this;
        }

        @Override
        public ImmutableNilValue immutableValue()
        {
            return ValueFactory.newNil();
        }

        @Override
        public void writeTo(MessagePacker pk)
                throws IOException
        {
            pk.packNil();
        }
    }

    ////
    // BooleanValue
    //

    public Variable setBooleanValue(boolean v)
    {
        this.type = Type.BOOLEAN;
        this.accessor = booleanAccessor;
        this.longValue = (v ? 1L : 0L);
        return this;
    }

    private class BooleanValueAccessor
            extends AbstractValueAccessor
            implements BooleanValue
    {
        @Override
        public ValueType getValueType()
        {
            return ValueType.BOOLEAN;
        }

        @Override
        public BooleanValue asBooleanValue()
        {
            return this;
        }

        @Override
        public ImmutableBooleanValue immutableValue()
        {
            return ValueFactory.newBoolean(getBoolean());
        }

        @Override
        public boolean getBoolean()
        {
            return longValue == 1L;
        }

        @Override
        public void writeTo(MessagePacker pk)
                throws IOException
        {
            pk.packBoolean(longValue == 1L);
        }
    }

    ////
    // NumberValue
    // IntegerValue
    // FloatValue
    //

    private static final BigInteger LONG_MIN = BigInteger.valueOf((long) Long.MIN_VALUE);
    private static final BigInteger LONG_MAX = BigInteger.valueOf((long) Long.MAX_VALUE);
    private static final long BYTE_MIN = (long) Byte.MIN_VALUE;
    private static final long BYTE_MAX = (long) Byte.MAX_VALUE;
    private static final long SHORT_MIN = (long) Short.MIN_VALUE;
    private static final long SHORT_MAX = (long) Short.MAX_VALUE;
    private static final long INT_MIN = (long) Integer.MIN_VALUE;
    private static final long INT_MAX = (long) Integer.MAX_VALUE;

    private abstract class AbstractNumberValueAccessor
            extends AbstractValueAccessor
            implements NumberValue
    {
        @Override
        public NumberValue asNumberValue()
        {
            return this;
        }

        @Override
        public byte toByte()
        {
            if (type == Type.BIG_INTEGER) {
                return ((BigInteger) objectValue).byteValue();
            }
            return (byte) longValue;
        }

        @Override
        public short toShort()
        {
            if (type == Type.BIG_INTEGER) {
                return ((BigInteger) objectValue).shortValue();
            }
            return (short) longValue;
        }

        @Override
        public int toInt()
        {
            if (type == Type.BIG_INTEGER) {
                return ((BigInteger) objectValue).intValue();
            }
            return (int) longValue;
        }

        @Override
        public long toLong()
        {
            if (type == Type.BIG_INTEGER) {
                return ((BigInteger) objectValue).longValue();
            }
            return (long) longValue;
        }

        @Override
        public BigInteger toBigInteger()
        {
            if (type == Type.BIG_INTEGER) {
                return (BigInteger) objectValue;
            }
            else if (type == Type.DOUBLE) {
                return new BigDecimal(doubleValue).toBigInteger();
            }
            return BigInteger.valueOf(longValue);
        }

        @Override
        public float toFloat()
        {
            if (type == Type.BIG_INTEGER) {
                return ((BigInteger) objectValue).floatValue();
            }
            else if (type == Type.DOUBLE) {
                return (float) doubleValue;
            }
            return (float) longValue;
        }

        @Override
        public double toDouble()
        {
            if (type == Type.BIG_INTEGER) {
                return ((BigInteger) objectValue).doubleValue();
            }
            else if (type == Type.DOUBLE) {
                return doubleValue;
            }
            return (double) longValue;
        }
    }

    ////
    // IntegerValue
    //

    public Variable setIntegerValue(long v)
    {
        this.type = Type.LONG;
        this.accessor = integerAccessor;
        this.longValue = v;
        return this;
    }

    public Variable setIntegerValue(BigInteger v)
    {
        if (0 <= v.compareTo(LONG_MIN) && v.compareTo(LONG_MAX) <= 0) {
            this.type = Type.LONG;
            this.accessor = integerAccessor;
            this.longValue = v.longValue();
        }
        else {
            this.type = Type.BIG_INTEGER;
            this.accessor = integerAccessor;
            this.objectValue = v;
        }
        return this;
    }

    private class IntegerValueAccessor
            extends AbstractNumberValueAccessor
            implements IntegerValue
    {
        @Override
        public ValueType getValueType()
        {
            return ValueType.INTEGER;
        }

        @Override
        public IntegerValue asIntegerValue()
        {
            return this;
        }

        @Override
        public ImmutableIntegerValue immutableValue()
        {
            if (type == Type.BIG_INTEGER) {
                return ValueFactory.newInteger((BigInteger) objectValue);
            }
            return ValueFactory.newInteger(longValue);
        }

        @Override
        public boolean isInByteRange()
        {
            if (type == Type.BIG_INTEGER) {
                return false;
            }
            return BYTE_MIN <= longValue && longValue <= BYTE_MAX;
        }

        @Override
        public boolean isInShortRange()
        {
            if (type == Type.BIG_INTEGER) {
                return false;
            }
            return SHORT_MIN <= longValue && longValue <= SHORT_MAX;
        }

        @Override
        public boolean isInIntRange()
        {
            if (type == Type.BIG_INTEGER) {
                return false;
            }
            return INT_MIN <= longValue && longValue <= INT_MAX;
        }

        @Override
        public boolean isInLongRange()
        {
            if (type == Type.BIG_INTEGER) {
                return false;
            }
            return true;
        }

        @Override
        public MessageFormat mostSuccinctMessageFormat()
        {
            return ImmutableBigIntegerValueImpl.mostSuccinctMessageFormat(this);
        }

        @Override
        public byte asByte()
        {
            if (!isInByteRange()) {
                throw new MessageIntegerOverflowException(longValue);
            }
            return (byte) longValue;
        }

        @Override
        public short asShort()
        {
            if (!isInByteRange()) {
                throw new MessageIntegerOverflowException(longValue);
            }
            return (short) longValue;
        }

        @Override
        public int asInt()
        {
            if (!isInIntRange()) {
                throw new MessageIntegerOverflowException(longValue);
            }
            return (int) longValue;
        }

        @Override
        public long asLong()
        {
            if (!isInLongRange()) {
                throw new MessageIntegerOverflowException(longValue);
            }
            return longValue;
        }

        @Override
        public BigInteger asBigInteger()
        {
            if (type == Type.BIG_INTEGER) {
                return (BigInteger) objectValue;
            }
            else {
                return BigInteger.valueOf(longValue);
            }
        }

        @Override
        public void writeTo(MessagePacker pk)
                throws IOException
        {
            if (type == Type.BIG_INTEGER) {
                pk.packBigInteger((BigInteger) objectValue);
            }
            else {
                pk.packLong(longValue);
            }
        }
    }

    ////
    // FloatValue
    //

    public Variable setFloatValue(double v)
    {
        this.type = Type.DOUBLE;
        this.accessor = floatAccessor;
        this.doubleValue = v;
        this.longValue = (long) v;  // AbstractNumberValueAccessor uses toLong
        return this;
    }

    public Variable setFloatValue(float v)
    {
        this.type = Type.DOUBLE;
        this.accessor = floatAccessor;
        this.longValue = (long) v;  // AbstractNumberValueAccessor uses toLong
        return this;
    }

    private class FloatValueAccessor
            extends AbstractNumberValueAccessor
            implements FloatValue
    {
        @Override
        public FloatValue asFloatValue()
        {
            return this;
        }

        @Override
        public ImmutableFloatValue immutableValue()
        {
            return ValueFactory.newFloat(doubleValue);
        }

        @Override
        public ValueType getValueType()
        {
            return ValueType.FLOAT;
        }

        @Override
        public void writeTo(MessagePacker pk)
                throws IOException
        {
            pk.packDouble(doubleValue);
        }
    }

    ////
    // RawValue
    // BinaryValue
    // StringValue
    //

    private abstract class AbstractRawValueAccessor
            extends AbstractValueAccessor
            implements RawValue
    {
        @Override
        public RawValue asRawValue()
        {
            return this;
        }

        @Override
        public byte[] asByteArray()
        {
            return (byte[]) objectValue;
        }

        @Override
        public ByteBuffer asByteBuffer()
        {
            return ByteBuffer.wrap(asByteArray());
        }

        @Override
        public String asString()
        {
            byte[] raw = (byte[]) objectValue;
            try {
                CharsetDecoder reportDecoder = MessagePack.UTF8.newDecoder()
                        .onMalformedInput(CodingErrorAction.REPORT)
                        .onUnmappableCharacter(CodingErrorAction.REPORT);
                return reportDecoder.decode(ByteBuffer.wrap(raw)).toString();
            }
            catch (CharacterCodingException ex) {
                throw new MessageStringCodingException(ex);
            }
        }

        // override for performance optimization
        @Override
        public String toString()
        {
            byte[] raw = (byte[]) objectValue;
            try {
                CharsetDecoder reportDecoder = MessagePack.UTF8.newDecoder()
                        .onMalformedInput(CodingErrorAction.REPLACE)
                        .onUnmappableCharacter(CodingErrorAction.REPLACE);
                return reportDecoder.decode(ByteBuffer.wrap(raw)).toString();
            }
            catch (CharacterCodingException ex) {
                throw new MessageStringCodingException(ex);
            }
        }
    }

    ////
    // BinaryValue
    //

    public Variable setBinaryValue(byte[] v)
    {
        this.type = Type.BYTE_ARRAY;
        this.accessor = binaryAccessor;
        this.objectValue = v;
        return this;
    }

    private class BinaryValueAccessor
            extends AbstractRawValueAccessor
            implements BinaryValue
    {
        @Override
        public ValueType getValueType()
        {
            return ValueType.BINARY;
        }

        @Override
        public BinaryValue asBinaryValue()
        {
            return this;
        }

        @Override
        public ImmutableBinaryValue immutableValue()
        {
            return ValueFactory.newBinary(asByteArray());
        }

        @Override
        public void writeTo(MessagePacker pk)
                throws IOException
        {
            byte[] data = (byte[]) objectValue;
            pk.packBinaryHeader(data.length);
            pk.writePayload(data);
        }
    }

    ////
    // StringValue
    //

    public Variable setStringValue(String v)
    {
        return setStringValue(v.getBytes(MessagePack.UTF8));
    }

    public Variable setStringValue(byte[] v)
    {
        this.type = Type.RAW_STRING;
        this.accessor = stringAccessor;
        this.objectValue = v;
        return this;
    }

    private class StringValueAccessor
            extends AbstractRawValueAccessor
            implements StringValue
    {
        @Override
        public ValueType getValueType()
        {
            return ValueType.STRING;
        }

        @Override
        public StringValue asStringValue()
        {
            return this;
        }

        @Override
        public ImmutableStringValue immutableValue()
        {
            return ValueFactory.newString((byte[]) objectValue);
        }

        @Override
        public void writeTo(MessagePacker pk)
                throws IOException
        {
            byte[] data = (byte[]) objectValue;
            pk.packRawStringHeader(data.length);
            pk.writePayload(data);
        }
    }

    ////
    // ArrayValue
    //

    public Variable setArrayValue(List v)
    {
        this.type = Type.LIST;
        this.accessor = arrayAccessor;
        this.objectValue = v.toArray(new Value[v.size()]);
        return this;
    }

    public Variable setArrayValue(Value[] v)
    {
        this.type = Type.LIST;
        this.accessor = arrayAccessor;
        this.objectValue = v;
        return this;
    }

    private class ArrayValueAccessor
            extends AbstractValueAccessor
            implements ArrayValue
    {
        @Override
        public ValueType getValueType()
        {
            return ValueType.ARRAY;
        }

        @Override
        public ArrayValue asArrayValue()
        {
            return this;
        }

        @Override
        public ImmutableArrayValue immutableValue()
        {
            return ValueFactory.newArray(array());
        }

        @Override
        public int size()
        {
            return array().length;
        }

        @Override
        public Value get(int index)
        {
            return array()[index];
        }

        @Override
        public Value getOrNilValue(int index)
        {
            Value[] a = array();
            if (a.length < index && index >= 0) {
                return ValueFactory.newNil();
            }
            return a[index];
        }

        @Override
        public Iterator iterator()
        {
            return list().iterator();
        }

        @Override
        public List list()
        {
            return Arrays.asList(array());
        }

        public Value[] array()
        {
            return (Value[]) objectValue;
        }

        @Override
        public void writeTo(MessagePacker pk)
                throws IOException
        {
            immutableValue().writeTo(pk);
        }
    }

    ////
    // MapValue
    //

    public Variable setMapValue(Map v)
    {
        this.type = Type.MAP;
        this.accessor = mapAccessor;
        Value[] kvs = new Value[v.size() * 2];
        Iterator> ite = v.entrySet().iterator();
        int i = 0;
        while (ite.hasNext()) {
            Map.Entry pair = ite.next();
            kvs[i] = pair.getKey();
            i++;
            kvs[i] = pair.getValue();
            i++;
        }
        this.objectValue = kvs;
        return this;
    }

    public Variable setMapValue(Value[] kvs)
    {
        this.type = Type.MAP;
        this.accessor = mapAccessor;
        this.objectValue = kvs;
        return this;
    }

    private class MapValueAccessor
            extends AbstractValueAccessor
            implements MapValue
    {
        @Override
        public ValueType getValueType()
        {
            return ValueType.MAP;
        }

        @Override
        public MapValue asMapValue()
        {
            return this;
        }

        @Override
        public ImmutableMapValue immutableValue()
        {
            return ValueFactory.newMap(getKeyValueArray());
        }

        @Override
        public int size()
        {
            return getKeyValueArray().length / 2;
        }

        @Override
        public Set keySet()
        {
            return immutableValue().keySet();
        }

        @Override
        public Set> entrySet()
        {
            return immutableValue().entrySet();
        }

        @Override
        public Collection values()
        {
            return immutableValue().values();
        }

        @Override
        public Value[] getKeyValueArray()
        {
            return (Value[]) objectValue;
        }

        public Map map()
        {
            return immutableValue().map();
        }

        @Override
        public void writeTo(MessagePacker pk)
                throws IOException
        {
            immutableValue().writeTo(pk);
        }
    }

    ////
    // ExtensionValue
    //
    public Variable setExtensionValue(byte type, byte[] data)
    {
        this.type = Type.EXTENSION;
        this.accessor = extensionAccessor;
        this.objectValue = ValueFactory.newExtension(type, data);
        return this;
    }

    private class ExtensionValueAccessor
            extends AbstractValueAccessor
            implements ExtensionValue
    {
        @Override
        public ValueType getValueType()
        {
            return ValueType.EXTENSION;
        }

        @Override
        public ExtensionValue asExtensionValue()
        {
            return this;
        }

        @Override
        public ImmutableExtensionValue immutableValue()
        {
            return (ImmutableExtensionValue) objectValue;
        }

        @Override
        public byte getType()
        {
            return ((ImmutableExtensionValue) objectValue).getType();
        }

        @Override
        public byte[] getData()
        {
            return ((ImmutableExtensionValue) objectValue).getData();
        }

        @Override
        public void writeTo(MessagePacker pk)
                throws IOException
        {
            ((ImmutableExtensionValue) objectValue).writeTo(pk);
        }
    }

    public Variable setTimestampValue(Instant timestamp)
    {
        this.type = Type.TIMESTAMP;
        this.accessor = timestampAccessor;
        this.objectValue = ValueFactory.newTimestamp(timestamp);
        return this;
    }

    private class TimestampValueAccessor
            extends AbstractValueAccessor
            implements TimestampValue
    {
        @Override
        public boolean isTimestampValue()
        {
            return true;
        }

        @Override
        public ValueType getValueType()
        {
            return ValueType.EXTENSION;
        }

        @Override
        public TimestampValue asTimestampValue()
        {
            return this;
        }

        @Override
        public ImmutableTimestampValue immutableValue()
        {
            return (ImmutableTimestampValue) objectValue;
        }

        @Override
        public byte getType()
        {
            return ((ImmutableTimestampValue) objectValue).getType();
        }

        @Override
        public byte[] getData()
        {
            return ((ImmutableTimestampValue) objectValue).getData();
        }

        @Override
        public void writeTo(MessagePacker pk)
                throws IOException
        {
            ((ImmutableTimestampValue) objectValue).writeTo(pk);
        }

        @Override
        public long getEpochSecond()
        {
            return ((ImmutableTimestampValue) objectValue).getEpochSecond();
        }

        @Override
        public int getNano()
        {
            return ((ImmutableTimestampValue) objectValue).getNano();
        }

        @Override
        public long toEpochMillis()
        {
            return ((ImmutableTimestampValue) objectValue).toEpochMillis();
        }

        @Override
        public Instant toInstant()
        {
            return ((ImmutableTimestampValue) objectValue).toInstant();
        }
    }

    ////
    // Value
    //

    @Override
    public ImmutableValue immutableValue()
    {
        return accessor.immutableValue();
    }

    @Override
    public void writeTo(MessagePacker pk)
            throws IOException
    {
        accessor.writeTo(pk);
    }

    @Override
    public int hashCode()
    {
        return immutableValue().hashCode();  // TODO optimize
    }

    @Override
    public boolean equals(Object o)
    {
        return immutableValue().equals(o);  // TODO optimize
    }

    @Override
    public String toJson()
    {
        return immutableValue().toJson();  // TODO optimize
    }

    @Override
    public String toString()
    {
        return immutableValue().toString();  // TODO optimize
    }

    @Override
    public ValueType getValueType()
    {
        return type.getValueType();
    }

    @Override
    public boolean isNilValue()
    {
        return getValueType().isNilType();
    }

    @Override
    public boolean isBooleanValue()
    {
        return getValueType().isBooleanType();
    }

    @Override
    public boolean isNumberValue()
    {
        return getValueType().isNumberType();
    }

    @Override
    public boolean isIntegerValue()
    {
        return getValueType().isIntegerType();
    }

    @Override
    public boolean isFloatValue()
    {
        return getValueType().isFloatType();
    }

    @Override
    public boolean isRawValue()
    {
        return getValueType().isRawType();
    }

    @Override
    public boolean isBinaryValue()
    {
        return getValueType().isBinaryType();
    }

    @Override
    public boolean isStringValue()
    {
        return getValueType().isStringType();
    }

    @Override
    public boolean isArrayValue()
    {
        return getValueType().isArrayType();
    }

    @Override
    public boolean isMapValue()
    {
        return getValueType().isMapType();
    }

    @Override
    public boolean isExtensionValue()
    {
        return getValueType().isExtensionType();
    }

    @Override
    public boolean isTimestampValue()
    {
        return this.type == Type.TIMESTAMP;
    }

    @Override
    public NilValue asNilValue()
    {
        if (!isNilValue()) {
            throw new MessageTypeCastException();
        }
        return (NilValue) accessor;
    }

    @Override
    public BooleanValue asBooleanValue()
    {
        if (!isBooleanValue()) {
            throw new MessageTypeCastException();
        }
        return (BooleanValue) accessor;
    }

    @Override
    public NumberValue asNumberValue()
    {
        if (!isNumberValue()) {
            throw new MessageTypeCastException();
        }
        return (NumberValue) accessor;
    }

    @Override
    public IntegerValue asIntegerValue()
    {
        if (!isIntegerValue()) {
            throw new MessageTypeCastException();
        }
        return (IntegerValue) accessor;
    }

    @Override
    public FloatValue asFloatValue()
    {
        if (!isFloatValue()) {
            throw new MessageTypeCastException();
        }
        return (FloatValue) accessor;
    }

    @Override
    public RawValue asRawValue()
    {
        if (!isRawValue()) {
            throw new MessageTypeCastException();
        }
        return (RawValue) accessor;
    }

    @Override
    public BinaryValue asBinaryValue()
    {
        if (!isBinaryValue()) {
            throw new MessageTypeCastException();
        }
        return (BinaryValue) accessor;
    }

    @Override
    public StringValue asStringValue()
    {
        if (!isStringValue()) {
            throw new MessageTypeCastException();
        }
        return (StringValue) accessor;
    }

    @Override
    public ArrayValue asArrayValue()
    {
        if (!isArrayValue()) {
            throw new MessageTypeCastException();
        }
        return (ArrayValue) accessor;
    }

    @Override
    public MapValue asMapValue()
    {
        if (!isMapValue()) {
            throw new MessageTypeCastException();
        }
        return (MapValue) accessor;
    }

    @Override
    public ExtensionValue asExtensionValue()
    {
        if (!isExtensionValue()) {
            throw new MessageTypeCastException();
        }
        return (ExtensionValue) accessor;
    }

    @Override
    public TimestampValue asTimestampValue()
    {
        if (!isTimestampValue()) {
            throw new MessageTypeCastException();
        }
        return (TimestampValue) accessor;
    }
}