/*
* #%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 java.io.IOException;
import java.util.Map;
import javax.inject.Inject;
import com.getperka.flatpack.FlatPackVisitor;
import com.getperka.flatpack.HasUuid;
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.UpdatingCodex;
import com.getperka.flatpack.ext.VisitorContext;
import com.getperka.flatpack.util.FlatPackCollections;
import com.google.gson.JsonElement;
import com.google.gson.JsonPrimitive;
import com.google.gson.stream.JsonWriter;
import com.google.inject.TypeLiteral;
/**
* Provides a mapping of entities to arbitrary values.
*/
public class EntityMapCodex<K extends HasUuid, V> extends UpdatingCodex<Map<K, V>> {
private EntityCodex<K> keyCodex;
private Codex<V> valueCodex;
protected EntityMapCodex() {}
@Override
public void acceptNotNull(FlatPackVisitor visitor, Map<K, V> value,
VisitorContext<Map<K, V>> context) {
if (visitor.visitValue(value, this, context)) {
for (Map.Entry<K, V> entry : value.entrySet()) {
context.walkImmutable(keyCodex).accept(visitor, entry.getKey());
V oldValue = entry.getValue();
V newValue = context.walkSingleton(valueCodex).accept(visitor, oldValue);
// Object comparison intentional
if (oldValue != newValue) {
entry.setValue(newValue);
}
}
}
visitor.endVisitValue(value, this, context);
}
@Override
public Type describe() {
return new Type.Builder()
.withJsonKind(JsonKind.MAP)
.withMapKey(keyCodex.describe())
.withMapValue(valueCodex.describe())
.build();
}
@Override
public String getPropertySuffix() {
return valueCodex.getPropertySuffix();
}
@Override
public Map<K, V> readNotNull(JsonElement element, DeserializationContext context)
throws IOException {
Map<K, V> toReturn = FlatPackCollections.mapForIteration();
for (Map.Entry<String, JsonElement> entry : element.getAsJsonObject().entrySet()) {
context.pushPath("." + entry.getKey());
try {
K key = keyCodex.read(new JsonPrimitive(entry.getKey()), context);
V value = valueCodex.read(entry.getValue(), context);
toReturn.put(key, value);
} finally {
context.popPath();
}
}
return toReturn;
}
@Override
public Map<K, V> replacementValueNotNull(Map<K, V> oldValue, Map<K, V> newValue) {
oldValue.clear();
oldValue.putAll(newValue);
return oldValue;
}
@Override
public void writeNotNull(Map<K, V> object, SerializationContext context) throws IOException {
JsonWriter writer = context.getWriter();
writer.beginObject();
for (Map.Entry<K, V> entry : object.entrySet()) {
String key = entry.getKey().getUuid().toString();
context.pushPath("." + key);
try {
writer.name(key);
valueCodex.write(entry.getValue(), context);
} finally {
context.popPath();
}
}
writer.endObject();
}
@Inject
@SuppressWarnings("unchecked")
void inject(EntityCodex<K> keyCodex, TypeLiteral<V> valueType, TypeContext typeContext) {
this.keyCodex = keyCodex;
this.valueCodex = (Codex<V>) typeContext.getCodex(valueType.getType());
}
}