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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.ser;
import java.util.Iterator;
import org.dominokit.jackson.JsonSerializationContext;
import org.dominokit.jackson.JsonSerializer;
import org.dominokit.jackson.JsonSerializerParameters;
import org.dominokit.jackson.stream.JsonWriter;
/**
* Default {@link org.dominokit.jackson.JsonSerializer} implementation for {@link
* java.lang.Iterable}.
*
* @param Type of the elements inside the {@link java.lang.Iterable}
*/
public class IterableJsonSerializer, T> extends JsonSerializer {
/**
* newInstance
*
* @param serializer {@link org.dominokit.jackson.JsonSerializer} used to serialize the objects
* inside the {@link java.lang.Iterable}
* @param Type of the {@link Iterable}
* @return a new instance of {@link org.dominokit.jackson.ser.IterableJsonSerializer}
*/
public static > IterableJsonSerializer newInstance(
JsonSerializer serializer) {
return new IterableJsonSerializer(serializer);
}
protected final JsonSerializer serializer;
/**
* Constructor for IterableJsonSerializer.
*
* @param serializer {@link org.dominokit.jackson.JsonSerializer} used to serialize the objects
* inside the {@link java.lang.Iterable}.
*/
protected IterableJsonSerializer(JsonSerializer serializer) {
if (null == serializer) {
throw new IllegalArgumentException("serializer cannot be null");
}
this.serializer = serializer;
}
/** {@inheritDoc} */
@Override
protected boolean isEmpty(I value) {
return null == value || !value.iterator().hasNext();
}
/** {@inheritDoc} */
@Override
public void doSerialize(
JsonWriter writer, I values, JsonSerializationContext ctx, JsonSerializerParameters params) {
Iterator iterator = values.iterator();
if (!iterator.hasNext()) {
if (ctx.isWriteEmptyJsonArrays()) {
writer.beginArray();
writer.endArray();
} else {
writer.cancelName();
}
return;
}
if (ctx.isWriteSingleElemArraysUnwrapped()) {
T first = iterator.next();
if (iterator.hasNext()) {
// there is more than one element, we write the array normally
writer.beginArray();
serializer.serialize(writer, first, ctx, params);
while (iterator.hasNext()) {
serializer.serialize(writer, iterator.next(), ctx, params);
}
writer.endArray();
} else {
// there is only one element, we write it directly
serializer.serialize(writer, first, ctx, params);
}
} else {
writer.beginArray();
while (iterator.hasNext()) {
serializer.serialize(writer, iterator.next(), ctx, params);
}
writer.endArray();
}
}
}