io.takari.maven.plugins.util.PropertiesWriter.java Source code

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Here is the source code for io.takari.maven.plugins.util.PropertiesWriter.java

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/**
 * Copyright (c) 2014 Takari, Inc.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 */
package io.takari.maven.plugins.util;

import java.io.BufferedWriter;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;

import com.google.common.base.Charsets;
import com.google.common.io.ByteSource;
import com.google.common.io.CharSource;
import com.google.common.io.CharStreams;

/**
 * Helper to strip idiotic timestamp comment from properties files
 */
public class PropertiesWriter {
    // properties files are documented to use ISO_8859_1 encoding
    private static final Charset ENCODING = Charsets.ISO_8859_1;

    public static void write(Properties properties, String comment, OutputStream out) throws IOException {
        StringBuilder sb = new StringBuilder();
        properties.store(CharStreams.asWriter(sb), comment);
        write(CharSource.wrap(sb.toString()), comment, out);
    }

    public static void write(byte[] properties, OutputStream out) throws IOException {
        // properties files are documented to use ISO_8859_1 encoding
        write(ByteSource.wrap(properties).asCharSource(ENCODING), null, out);
    }

    private static void write(CharSource charSource, String comment, OutputStream out) throws IOException {
        List<String> lines = new ArrayList<>(charSource.readLines());
        lines.remove(comment != null ? 1 : 0);
        BufferedWriter w = new BufferedWriter(new OutputStreamWriter(out, ENCODING));
        for (String line : lines) {
            w.write(line);
            w.newLine();
        }
        w.flush();
    }
}