JsonNull.java

/*
 * Apache License
 * Version 2.0, January 2004
 * http://www.apache.org/licenses/
 *
 *    Copyright 2013 Aurelian Tutuianu
 *    Copyright 2014 Aurelian Tutuianu
 *    Copyright 2015 Aurelian Tutuianu
 *    Copyright 2016 Aurelian Tutuianu
 *
 *    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 rapaio.io.json.tree;

import java.util.Optional;

/**
 * Created by <a href="mailto:padreati@yahoo.com">Aurelian Tutuianu</a> at 2/26/15.
 */
public final class JsonNull extends JsonValue {

    @Override
    public JsonValue get(String key) {
        return JsonValue.NULL;
    }

    @Override
    public Optional<String> asString(String key) {
        return Optional.of("null");
    }

    @Override
    public Optional<String> asString() {
        return Optional.of("null");
    }

    @Override
    public Optional<Double> asDouble(String key) {
        return Optional.empty();
    }

    @Override
    public Optional<Double> asDouble() {
        return Optional.empty();
    }

    @Override
    public Optional<Boolean> asBool(String key) {
        return Optional.empty();
    }

    @Override
    public Optional<Boolean> asBool() {
        return Optional.empty();
    }

    @Override
    public String toString() {
        return "null";
    }

    @Override
    protected String pretty(int level) {
        return "";
    }

    @Override
    public boolean equals(Object o) {
        return this == o || !(o == null || getClass() != o.getClass());
    }

    @Override
    public int hashCode() {
        return 1;
    }
}