//

// 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.io.IOException;

import org.msgpack.packer.Packer;

public class NilValue extends AbstractValue {

private NilValue() {

}

private static NilValue instance = new NilValue();

static NilValue getInstance() {

return instance;

}

@Override

public ValueType getType() {

return ValueType.NIL;

}

@Override

public boolean isNilValue() {

return true;

}

@Override

public NilValue asNilValue() {

return this;

}

@Override

public String toString() {

return "null";

}

@Override

public StringBuilder toString(StringBuilder sb) {

return sb.append("null");

}

@Override

public void writeTo(Packer pk) throws IOException {

pk.writeNil();

}

@Override

public boolean equals(Object o) {

if (o == this) {

return true;

}

if (!(o instanceof Value)) {

return false;

}

return ((Value) o).isNilValue();

}

@Override

public int hashCode() {

return 0;

}

}