/*
* #%L
* FlatPack serialization code
* %%
* Copyright (C) 2012 Perka Inc.
* %%
* 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.
* #L%
*/
package com.getperka.flatpack.codexes;
import static com.getperka.flatpack.util.FlatPackTypes.erase;
import java.io.IOException;
import java.lang.reflect.Array;
import javax.inject.Inject;
import com.getperka.flatpack.FlatPackVisitor;
import com.getperka.flatpack.ext.Codex;
import com.getperka.flatpack.ext.DeserializationContext;
import com.getperka.flatpack.ext.JsonKind;
import com.getperka.flatpack.ext.SerializationContext;
import com.getperka.flatpack.ext.Type;
import com.getperka.flatpack.ext.TypeContext;
import com.getperka.flatpack.ext.VisitorContext;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.stream.JsonWriter;
import com.google.inject.TypeLiteral;
/**
* Serializes Java arrays as a json array.
*
* @param <T> the type of data contained in the array
*/
public class ArrayCodex<T> extends Codex<T[]> {
protected Class<T> elementType;
protected Codex<T> valueCodex;
protected ArrayCodex() {}
@Override
public void acceptNotNull(FlatPackVisitor visitor, T[] value, VisitorContext<T[]> context) {
if (visitor.visitValue(value, this, context)) {
context.walkArray(valueCodex).accept(visitor, value);
}
visitor.endVisitValue(value, this, context);
}
@Override
public Type describe() {
return new Type.Builder()
.withJsonKind(JsonKind.LIST)
.withListElement(valueCodex.describe())
.build();
}
@Override
public String getPropertySuffix() {
return valueCodex.getPropertySuffix();
}
@Override
public T[] readNotNull(JsonElement element, DeserializationContext context) throws Exception {
JsonArray array = element.getAsJsonArray();
@SuppressWarnings("unchecked")
T[] toReturn = (T[]) Array.newInstance(elementType, array.size());
for (int i = 0, j = array.size(); i < j; i++) {
context.pushPath("[" + i + "]");
toReturn[i] = valueCodex.read(array.get(i), context);
context.popPath();
}
return toReturn;
}
@Override
public void writeNotNull(T[] object, SerializationContext context) throws IOException {
JsonWriter writer = context.getWriter();
writer.beginArray();
int count = 0;
for (T t : object) {
context.pushPath("[" + count++ + "]");
valueCodex.write(t, context);
context.popPath();
}
writer.endArray();
}
@Inject
@SuppressWarnings("unchecked")
void inject(TypeLiteral<T> elementType, TypeContext context) {
this.elementType = erase(elementType.getType());
this.valueCodex = (Codex<T>) context.getCodex(elementType.getType());
}
}