org.github.evenjn.gzip.GZipDecoderBlueprint.java Source code

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Here is the source code for org.github.evenjn.gzip.GZipDecoderBlueprint.java

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/**
 *
 * Copyright 2016 Marco Trevisan
 *
 * 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.
 * 
 */
package org.github.evenjn.gzip;

import java.io.InputStream;

import org.apache.commons.compress.compressors.CompressorException;
import org.apache.commons.compress.compressors.CompressorInputStream;
import org.apache.commons.compress.compressors.CompressorStreamFactory;
import org.github.evenjn.yarn.FunctionH;
import org.github.evenjn.yarn.Hook;

public class GZipDecoderBlueprint {

    public FunctionH<InputStream, InputStream> build() {
        return GZipDecoderBlueprint::decode;
    }

    private static InputStream decode(Hook hook, InputStream is) {
        try {
            /**
             * This never throws, it's not closeable.
             */
            CompressorStreamFactory compressorStreamFactory = new CompressorStreamFactory();

            /**
             * This may throw. The result is autocloseable.
             */
            CompressorInputStream createCompressorInputStream = compressorStreamFactory
                    .createCompressorInputStream(CompressorStreamFactory.GZIP, is);

            return hook.hook(createCompressorInputStream);
        } catch (CompressorException e) {
            throw new RuntimeException(e);
        }
    }
}