/*
* Copyright 2013 Nicolas Morel
*
* 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 com.github.nmorel.gwtjackson.client.ser;
import java.math.BigDecimal;
import java.math.BigInteger;
import com.github.nmorel.gwtjackson.client.JsonSerializationContext;
import com.github.nmorel.gwtjackson.client.JsonSerializer;
import com.github.nmorel.gwtjackson.client.JsonSerializerParameters;
import com.github.nmorel.gwtjackson.client.stream.JsonWriter;
/**
* Base implementation of {@link JsonSerializer} for {@link Number}.
*
* @author Nicolas Morel
* @version $Id: $
*/
public abstract class BaseNumberJsonSerializer<N extends Number> extends JsonSerializer<N> {
/**
* Default implementation of {@link BaseNumberJsonSerializer} for {@link BigDecimal}
*/
public static final class BigDecimalJsonSerializer extends BaseNumberJsonSerializer<BigDecimal> {
private static final BigDecimalJsonSerializer INSTANCE = new BigDecimalJsonSerializer();
/**
* @return an instance of {@link BigDecimalJsonSerializer}
*/
public static BigDecimalJsonSerializer getInstance() {
return INSTANCE;
}
private BigDecimalJsonSerializer() { }
@Override
protected boolean isDefault( BigDecimal value ) {
return null == value || BigDecimal.ZERO.compareTo( value ) == 0;
}
}
/**
* Default implementation of {@link BaseNumberJsonSerializer} for {@link BigInteger}
*/
public static final class BigIntegerJsonSerializer extends BaseNumberJsonSerializer<BigInteger> {
private static final BigIntegerJsonSerializer INSTANCE = new BigIntegerJsonSerializer();
/**
* @return an instance of {@link BigIntegerJsonSerializer}
*/
public static BigIntegerJsonSerializer getInstance() {
return INSTANCE;
}
private BigIntegerJsonSerializer() { }
@Override
protected boolean isDefault( BigInteger value ) {
return null == value || BigInteger.ZERO.compareTo( value ) == 0;
}
}
/**
* Default implementation of {@link BaseNumberJsonSerializer} for {@link Byte}
*/
public static final class ByteJsonSerializer extends BaseNumberJsonSerializer<Byte> {
private static final ByteJsonSerializer INSTANCE = new ByteJsonSerializer();
/**
* @return an instance of {@link ByteJsonSerializer}
*/
public static ByteJsonSerializer getInstance() {
return INSTANCE;
}
private static byte defaultValue;
private ByteJsonSerializer() { }
@Override
protected boolean isDefault( Byte value ) {
return null == value || defaultValue == value;
}
}
/**
* Default implementation of {@link BaseNumberJsonSerializer} for {@link Double}
*/
public static final class DoubleJsonSerializer extends BaseNumberJsonSerializer<Double> {
private static final DoubleJsonSerializer INSTANCE = new DoubleJsonSerializer();
/**
* @return an instance of {@link DoubleJsonSerializer}
*/
public static DoubleJsonSerializer getInstance() {
return INSTANCE;
}
private DoubleJsonSerializer() { }
@Override
protected boolean isDefault( Double value ) {
return null == value || value == 0d;
}
@Override
public void doSerialize( JsonWriter writer, Double value, JsonSerializationContext ctx, JsonSerializerParameters params ) {
// writer has a special method to write double, let's use instead of default Number method.
writer.value( value.doubleValue() );
}
}
/**
* Default implementation of {@link BaseNumberJsonSerializer} for {@link Float}
*/
public static final class FloatJsonSerializer extends BaseNumberJsonSerializer<Float> {
private static final FloatJsonSerializer INSTANCE = new FloatJsonSerializer();
/**
* @return an instance of {@link FloatJsonSerializer}
*/
public static FloatJsonSerializer getInstance() {
return INSTANCE;
}
private FloatJsonSerializer() { }
@Override
protected boolean isDefault( Float value ) {
return null == value || value == 0f;
}
}
/**
* Default implementation of {@link BaseNumberJsonSerializer} for {@link Integer}
*/
public static final class IntegerJsonSerializer extends BaseNumberJsonSerializer<Integer> {
private static final IntegerJsonSerializer INSTANCE = new IntegerJsonSerializer();
/**
* @return an instance of {@link IntegerJsonSerializer}
*/
public static IntegerJsonSerializer getInstance() {
return INSTANCE;
}
private IntegerJsonSerializer() { }
@Override
protected boolean isDefault( Integer value ) {
return null == value || value == 0;
}
}
/**
* Default implementation of {@link BaseNumberJsonSerializer} for {@link Long}
*/
public static final class LongJsonSerializer extends BaseNumberJsonSerializer<Long> {
private static final LongJsonSerializer INSTANCE = new LongJsonSerializer();
/**
* @return an instance of {@link LongJsonSerializer}
*/
public static LongJsonSerializer getInstance() {
return INSTANCE;
}
private LongJsonSerializer() { }
@Override
protected boolean isDefault( Long value ) {
return null == value || value == 0l;
}
@Override
public void doSerialize( JsonWriter writer, Long value, JsonSerializationContext ctx, JsonSerializerParameters params ) {
// writer has a special method to write long, let's use instead of default Number method.
writer.value( value.longValue() );
}
}
/**
* Default implementation of {@link BaseNumberJsonSerializer} for {@link Short}
*/
public static final class ShortJsonSerializer extends BaseNumberJsonSerializer<Short> {
private static final ShortJsonSerializer INSTANCE = new ShortJsonSerializer();
/**
* @return an instance of {@link ShortJsonSerializer}
*/
public static ShortJsonSerializer getInstance() {
return INSTANCE;
}
private static short defaultValue;
private ShortJsonSerializer() { }
@Override
protected boolean isDefault( Short value ) {
return null == value || defaultValue == value;
}
}
/**
* Default implementation of {@link BaseNumberJsonSerializer} for {@link Number}
*/
public static final class NumberJsonSerializer extends BaseNumberJsonSerializer<Number> {
private static final NumberJsonSerializer INSTANCE = new NumberJsonSerializer();
/**
* @return an instance of {@link NumberJsonSerializer}
*/
public static NumberJsonSerializer getInstance() {
return INSTANCE;
}
private NumberJsonSerializer() { }
@Override
protected boolean isDefault( Number value ) {
return null == value || value.intValue() == 0;
}
}
/** {@inheritDoc} */
@Override
public void doSerialize( JsonWriter writer, N value, JsonSerializationContext ctx, JsonSerializerParameters params ) {
writer.value( value );
}
}