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package com.yammer.backups.util;

/*
 * #%L
 * Backups
 * %%
 * Copyright (C) 2013 - 2014 Microsoft Corporation
 * %%
 * 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%
 */

import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.common.base.Function;
import com.google.common.base.Throwables;
import com.yammer.collections.azure.Bytes;
import com.yammer.io.codec.StreamCodec;
import com.yammer.io.codec.compression.GZIPCompressionCodec;
import io.dropwizard.jackson.Jackson;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;

public class CompressedJsonSerializationFunction implements Function {

    private static final StreamCodec CODEC = new GZIPCompressionCodec();
    private static final ObjectMapper JSON = Jackson.newObjectMapper();

    @Override
    public Bytes apply(T input) {
        final ByteArrayOutputStream bout = new ByteArrayOutputStream();
        try (final OutputStream out = CODEC.output(bout)) {
            JSON.writeValue(out, input);
            return Bytes.of(bout.toByteArray());
        } catch (IOException e) {
            throw Throwables.propagate(e);
        }
    }
}