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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * Copyright (c) 2017 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 javax.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 implements JsonObject, Serializable {

    private static final long serialVersionUID = -1461653546889072583L;

    @Override
    public Set> entrySet() {
        return Collections.>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
    private Object readResolve() {
        return JsonValue.EMPTY_JSON_OBJECT;
    }
}