me.qoomon.maven.gitversioning.MavenUtil Maven / Gradle / Ivy

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Maven Git Versioning Extension
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package me.qoomon.maven.gitversioning;

import de.pdark.decentxml.Document;
import de.pdark.decentxml.XMLParser;
import de.pdark.decentxml.XMLStringSource;
import org.apache.maven.model.BuildBase;
import org.apache.maven.model.Model;
import org.apache.maven.model.ModelBase;
import org.apache.maven.model.Profile;
import org.apache.maven.model.io.xpp3.MavenXpp3Reader;
import org.apache.maven.model.io.xpp3.MavenXpp3Writer;
import org.codehaus.plexus.util.xml.pull.XmlPullParserException;

import java.io.*;
import java.nio.file.Files;
import java.util.Arrays;

import static java.nio.file.Files.readAllBytes;

/**
 * Created by qoomon on 18/11/2016.
 */
final class MavenUtil {

    /**
     * Read model from pom file
     *
     * @param pomFile pomFile
     * @return Model
     * @throws IOException IOException
     */
    static Model readModel(File pomFile) throws IOException {
        try (FileReader fileReader = new FileReader(pomFile)) {
            Model model = new MavenXpp3Reader().read(fileReader);
            model.setPomFile(pomFile);
            return model;
        } catch (XmlPullParserException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Writes model to pom file
     *
     * @param pomFile pomFile
     * @param model   model
     * @throws IOException IOException
     */
    static void writeModel(File pomFile, Model model) throws IOException {
        try (FileWriter fileWriter = new FileWriter(pomFile)) {
            new MavenXpp3Writer().write(fileWriter, model);
        }
    }

    /**
     * Builds pom file location from relative path
     *
     * @param workingDirectory current working directory
     * @param relativePath     pom file path or directory of pom.xml
     * @return pom.xml file
     */
    public static File pomFile(File workingDirectory, String relativePath) {
        File modulePomFile = new File(workingDirectory, relativePath);
        if (modulePomFile.isDirectory()) {
            modulePomFile = new File(modulePomFile, "pom.xml");
        }
        return modulePomFile;
    }

    public static void writeXml(final File file, final Document gitVersionedPom) throws IOException {
        byte[] gitVersionedPomBytes = gitVersionedPom.toXML().getBytes();
        if (file.exists()) {
            byte[] existingPomBytes = readAllBytes(file.toPath());
            if (Arrays.equals(gitVersionedPomBytes, existingPomBytes)) {
                // do not write if there is no change
                return;
            }
        }
        Files.write(file.toPath(), gitVersionedPomBytes);
    }

    public static Document readXml(File file) throws IOException {
        String pomXml = new String(readAllBytes(file.toPath()));
        XMLParser parser = new XMLParser();
        return parser.parse(new XMLStringSource(pomXml));
    }

    public static BuildBase getBuild(ModelBase model) {
        if (model instanceof Profile) {
            return ((Profile) model).getBuild();
        }
        return ((Model) model).getBuild();
    }
}