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With inspiration from other libraries
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2013 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://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/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 packager/legal/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 org.glassfish.json;
import javax.json.JsonNumber;
import java.math.BigDecimal;
import java.math.BigInteger;
/**
* JsonNumber impl. Subclasses provide optimized implementations
* when backed by int, long, BigDecimal
*
* @author Jitendra Kotamraju
*/
abstract class JsonNumberImpl implements JsonNumber {
static JsonNumber getJsonNumber(int num) {
return new JsonIntNumber(num);
}
static JsonNumber getJsonNumber(long num) {
return new JsonLongNumber(num);
}
static JsonNumber getJsonNumber(BigInteger value) {
return new JsonBigDecimalNumber(new BigDecimal(value));
}
static JsonNumber getJsonNumber(double value) {
//bigDecimal = new BigDecimal(value);
// This is the preferred way to convert double to BigDecimal
return new JsonBigDecimalNumber(BigDecimal.valueOf(value));
}
static JsonNumber getJsonNumber(BigDecimal value) {
return new JsonBigDecimalNumber(value);
}
// Optimized JsonNumber impl for int numbers.
private static final class JsonIntNumber extends JsonNumberImpl {
private final int num;
private BigDecimal bigDecimal; // assigning it lazily on demand
JsonIntNumber(int num) {
this.num = num;
}
@Override
public boolean isIntegral() {
return true;
}
@Override
public int intValue() {
return num;
}
@Override
public int intValueExact() {
return num;
}
@Override
public long longValue() {
return num;
}
@Override
public long longValueExact() {
return num;
}
@Override
public double doubleValue() {
return num;
}
@Override
public BigDecimal bigDecimalValue() {
// reference assignments are atomic. At the most some more temp
// BigDecimal objects are created
BigDecimal bd = bigDecimal;
if (bd == null) {
bigDecimal = bd = new BigDecimal(num);
}
return bd;
}
@Override
public String toString() {
return Integer.toString(num);
}
}
// Optimized JsonNumber impl for long numbers.
private static final class JsonLongNumber extends JsonNumberImpl {
private final long num;
private BigDecimal bigDecimal; // assigning it lazily on demand
JsonLongNumber(long num) {
this.num = num;
}
@Override
public boolean isIntegral() {
return true;
}
@Override
public long longValue() {
return num;
}
@Override
public long longValueExact() {
return num;
}
@Override
public double doubleValue() {
return num;
}
@Override
public BigDecimal bigDecimalValue() {
// reference assignments are atomic. At the most some more temp
// BigDecimal objects are created
BigDecimal bd = bigDecimal;
if (bd == null) {
bigDecimal = bd = new BigDecimal(num);
}
return bd;
}
@Override
public String toString() {
return Long.toString(num);
}
}
// JsonNumber impl using BigDecimal numbers.
private static final class JsonBigDecimalNumber extends JsonNumberImpl {
private final BigDecimal bigDecimal;
JsonBigDecimalNumber(BigDecimal value) {
this.bigDecimal = value;
}
@Override
public BigDecimal bigDecimalValue() {
return bigDecimal;
}
}
@Override
public boolean isIntegral() {
return bigDecimalValue().scale() == 0;
}
@Override
public int intValue() {
return bigDecimalValue().intValue();
}
@Override
public int intValueExact() {
return bigDecimalValue().intValueExact();
}
@Override
public long longValue() {
return bigDecimalValue().longValue();
}
@Override
public long longValueExact() {
return bigDecimalValue().longValueExact();
}
@Override
public double doubleValue() {
return bigDecimalValue().doubleValue();
}
@Override
public BigInteger bigIntegerValue() {
return bigDecimalValue().toBigInteger();
}
@Override
public BigInteger bigIntegerValueExact() {
return bigDecimalValue().toBigIntegerExact();
}
@Override
public ValueType getValueType() {
return ValueType.NUMBER;
}
@Override
public int hashCode() {
return bigDecimalValue().hashCode();
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof JsonNumber)) {
return false;
}
JsonNumber other = (JsonNumber)obj;
return bigDecimalValue().equals(other.bigDecimalValue());
}
@Override
public String toString() {
return bigDecimalValue().toString();
}
}