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/*
* 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 org.dominokit.jackson;
import org.dominokit.jackson.exception.JsonSerializationException;
import org.dominokit.jackson.stream.JsonWriter;
/**
* Base class for all the serializer. It handles null values and exceptions. The rest is delegated
* to implementations.
*/
public abstract class JsonSerializer {
/**
* Serializes an object into JSON output.
*
* @param writer {@link org.dominokit.jackson.stream.JsonWriter} used to write the serialized JSON
* @param value Object to serialize
* @param ctx Context for the full serialization process
* @throws org.dominokit.jackson.exception.JsonSerializationException if an error occurs during
* the serialization
*/
public void serialize(JsonWriter writer, T value, JsonSerializationContext ctx)
throws JsonSerializationException {
serialize(writer, value, ctx, ctx.defaultParameters());
}
/**
* Serializes an object into JSON output.
*
* @param writer {@link org.dominokit.jackson.stream.JsonWriter} used to write the serialized JSON
* @param value Object to serialize
* @param ctx Context for the full serialization process
* @param params Parameters for this serialization
* @throws org.dominokit.jackson.exception.JsonSerializationException if an error occurs during
* the serialization
*/
public void serialize(
JsonWriter writer, T value, JsonSerializationContext ctx, JsonSerializerParameters params)
throws JsonSerializationException {
serialize(writer, value, ctx, params, false);
}
/**
* Serializes an object into JSON output.
*
* @param writer {@link org.dominokit.jackson.stream.JsonWriter} used to write the serialized JSON
* @param value Object to serialize
* @param ctx Context for the full serialization process
* @param params Parameters for this serialization
* @param isMapValue indicate if you're serializing a Map value
* @throws org.dominokit.jackson.exception.JsonSerializationException if an error occurs during
* the serialization
*/
public void serialize(
JsonWriter writer,
T value,
JsonSerializationContext ctx,
JsonSerializerParameters params,
boolean isMapValue)
throws JsonSerializationException {
if (null != params.getInclude() && !isMapValue) {
switch (params.getInclude()) {
case ALWAYS:
if (null == value) {
serializeNullValue(writer, ctx, params);
} else {
doSerialize(writer, value, ctx, params);
}
return;
case NON_DEFAULT:
if (isDefault(value)) {
writer.cancelName();
} else {
doSerialize(writer, value, ctx, params);
}
return;
case NON_EMPTY:
if (isEmpty(value)) {
writer.cancelName();
} else {
doSerialize(writer, value, ctx, params);
}
return;
case NON_NULL:
if (null == value) {
writer.cancelName();
} else {
doSerialize(writer, value, ctx, params);
}
return;
case NON_ABSENT:
if (isAbsent(value)) {
writer.cancelName();
} else {
doSerialize(writer, value, ctx, params);
}
return;
}
}
if (null == value) {
if (ctx.isSerializeNulls() || (isMapValue && ctx.isWriteNullMapValues())) {
serializeNullValue(writer, ctx, params);
} else {
writer.cancelName();
}
} else {
doSerialize(writer, value, ctx, params);
}
}
/**
* Serialize the null value. This method allows children to override the default behaviour.
*
* @param writer {@link org.dominokit.jackson.stream.JsonWriter} used to write the serialized JSON
* @param ctx Context for the full serialization process
* @param params Parameters for this serialization
*/
protected void serializeNullValue(
JsonWriter writer, JsonSerializationContext ctx, JsonSerializerParameters params) {
writer.nullValue();
}
/**
* isDefault.
*
* @param value the value
* @return true if the value corresponds to the default one
*/
protected boolean isDefault(T value) {
return isEmpty(value);
}
/**
* isEmpty.
*
* @param value the value
* @return true if the value is empty
*/
protected boolean isEmpty(T value) {
return null == value;
}
/**
* isAbsent.
*
* @param value the value
* @return true if the value is absent
*/
protected boolean isAbsent(T value) {
return null == value;
}
/**
* Serializes a non-null object into JSON output.
*
* @param writer {@link org.dominokit.jackson.stream.JsonWriter} used to write the serialized JSON
* @param value Object to serialize
* @param ctx Context for the full serialization process
* @param params Parameters for this serialization
*/
protected abstract void doSerialize(
JsonWriter writer, T value, JsonSerializationContext ctx, JsonSerializerParameters params);
}
