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

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Here is the source code for com.getperka.flatpack.codexes.ArrayCodex.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 static com.getperka.flatpack.util.FlatPackTypes.erase;

import java.io.IOException;
import java.lang.reflect.Array;

import javax.inject.Inject;

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.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[]> {
    private Class<T> elementType;
    private Codex<T> valueCodex;

    protected ArrayCodex() {
    }

    @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 scanNotNull(T[] object, SerializationContext context) {
        int count = 0;
        for (T t : object) {
            context.pushPath("[" + count++ + "]");
            valueCodex.scan(t, context);
            context.popPath();
        }
    }

    @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());
    }
}