Compressor.java

package com.insightfullogic.java8.examples.chapter8.strategy;

import java.io.*;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.zip.GZIPOutputStream;
import java.util.zip.ZipOutputStream;

// BEGIN Compressor
public class Compressor {

    private final CompressionStrategy strategy;

    public Compressor(CompressionStrategy strategy) {
        this.strategy = strategy;
    }

    public void compress(Path inFile, File outFile) throws IOException {
        try (OutputStream outStream = new FileOutputStream(outFile)) {
            Files.copy(inFile, strategy.compress(outStream));
        }
    }
// END Compressor

    public static void classBasedExample(Path inFile, File outFile) throws IOException {
// BEGIN classBasedExample
Compressor gzipCompressor = new Compressor(new GzipCompressionStrategy());
gzipCompressor.compress(inFile, outFile);

Compressor zipCompressor = new Compressor(new ZipCompressionStrategy());
zipCompressor.compress(inFile, outFile);
// END classBasedExample
    }

    public static void lambdaBasedExample(Path inFile, File outFile) throws IOException {
// BEGIN lambdaBasedExample
Compressor gzipCompressor = new Compressor(GZIPOutputStream::new);
gzipCompressor.compress(inFile, outFile);
        
Compressor zipCompressor = new Compressor(ZipOutputStream::new);
zipCompressor.compress(inFile, outFile);
// END lambdaBasedExample
    }

}