com.getperka.flatpack.codexes.EntityMapCodex.java Source code

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Here is the source code for com.getperka.flatpack.codexes.EntityMapCodex.java

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/*
 * #%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.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.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 Codex<Map<K, V>> {
    private EntityCodex<K> keyCodex;
    private Codex<V> valueCodex;

    protected EntityMapCodex() {
    }

    @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 void scanNotNull(Map<K, V> object, SerializationContext context) {
        for (Map.Entry<K, V> entry : object.entrySet()) {
            context.pushPath("." + entry.getKey().getUuid());
            try {
                keyCodex.scan(entry.getKey(), context);
                valueCodex.scan(entry.getValue(), context);
            } finally {
                context.popPath();
            }
        }
    }

    @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());
    }

}