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EmptyObject.java
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EmptyObject.java
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/*
* Copyright (c) 2017, 2022 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
package jakarta.json;
import java.io.Serializable;
import java.util.AbstractMap;
import java.util.Collections;
import java.util.Set;
/**
* Private implementation of immutable {@link JsonObject}.
*
* @author Lukas Jungmann
*/
final class EmptyObject extends AbstractMap<String, JsonValue> implements JsonObject, Serializable {
/** for serialization */
private static final long serialVersionUID = -1461653546889072583L;
/** Default constructor. */
EmptyObject() {}
@Override
public Set<Entry<String, JsonValue>> entrySet() {
return Collections.<Entry<String, JsonValue>>emptySet();
}
@Override
public JsonArray getJsonArray(String name) {
return (JsonArray) get(name);
}
@Override
public JsonObject getJsonObject(String name) {
return (JsonObject) get(name);
}
@Override
public JsonNumber getJsonNumber(String name) {
return (JsonNumber) get(name);
}
@Override
public JsonString getJsonString(String name) {
return (JsonString) get(name);
}
@Override
public String getString(String name) {
return getJsonString(name).getString();
}
@Override
public String getString(String name, String defaultValue) {
return defaultValue;
}
@Override
public int getInt(String name) {
return getJsonNumber(name).intValue();
}
@Override
public int getInt(String name, int defaultValue) {
return defaultValue;
}
@Override
public boolean getBoolean(String name) {
throw new NullPointerException();
}
@Override
public boolean getBoolean(String name, boolean defaultValue) {
return defaultValue;
}
@Override
public boolean isNull(String name) {
throw new NullPointerException();
}
@Override
public ValueType getValueType() {
return ValueType.OBJECT;
}
/**
* Preserves singleton property
* @return {@link JsonValue#EMPTY_JSON_OBJECT}
*/
private Object readResolve() {
return JsonValue.EMPTY_JSON_OBJECT;
}
}