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EmptyArray.java
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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2017 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://oss.oracle.com/licenses/CDDL+GPL-1.1
* or LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*/
package javax.json;
import java.io.Serializable;
import java.util.AbstractList;
import java.util.Collections;
import java.util.List;
import java.util.RandomAccess;
/**
* Private implementation of immutable {@link JsonArray}.
*
* @author Lukas Jungmann
*/
final class EmptyArray extends AbstractList<JsonValue> implements JsonArray, Serializable, RandomAccess {
private static final long serialVersionUID = 7295439472061642859L;
@Override
public JsonValue get(int index) {
throw new IndexOutOfBoundsException("Index: " + index);
}
@Override
public int size() {
return 0;
}
@Override
public JsonObject getJsonObject(int index) {
return (JsonObject) get(index);
}
@Override
public JsonArray getJsonArray(int index) {
return (JsonArray) get(index);
}
@Override
public JsonNumber getJsonNumber(int index) {
return (JsonNumber) get(index);
}
@Override
public JsonString getJsonString(int index) {
return (JsonString) get(index);
}
@Override
public <T extends JsonValue> List<T> getValuesAs(Class<T> clazz) {
return Collections.emptyList();
}
@Override
public String getString(int index) {
return getJsonString(index).getString();
}
@Override
public String getString(int index, String defaultValue) {
return defaultValue;
}
@Override
public int getInt(int index) {
return getJsonNumber(index).intValue();
}
@Override
public int getInt(int index, int defaultValue) {
return defaultValue;
}
@Override
public boolean getBoolean(int index) {
return get(index) == JsonValue.TRUE;
}
@Override
public boolean getBoolean(int index, boolean defaultValue) {
return defaultValue;
}
@Override
public boolean isNull(int index) {
return get(index) == JsonValue.NULL;
}
@Override
public ValueType getValueType() {
return ValueType.ARRAY;
}
// Preserves singleton property
private Object readResolve() {
return JsonValue.EMPTY_JSON_ARRAY;
}
}