Add util methods to print App information from MANIFEST.MF

1 files changed, 147 insertions, 0 deletions

diff --git a/src/main/java/org/openslx/util/AppUtil.java b/src/main/java/org/openslx/util/AppUtil.java
new file mode 100644
index 0000000..c782cae
--- /dev/null
+++ b/src/main/java/org/openslx/util/AppUtil.java
@@ -0,0 +1,147 @@
+package org.openslx.util;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.URISyntaxException;
+import java.time.Instant;
+import java.time.ZoneId;
+import java.time.format.DateTimeFormatter;
+import java.util.jar.JarInputStream;
+import java.util.jar.Manifest;
+
+import org.apache.log4j.Logger;
+
+public class AppUtil
+{
+	private static final int PROPERTY_MAX_WIDTH = 30;
+
+	private static final String MANIFEST_REVISION_VERSION = "Revision-Version";
+	private static final String MANIFEST_REVISION_BRANCH = "Revision-Branch";
+	private static final String MANIFEST_BUILD_TIMESTAMP = "Build-Timestamp";
+	private static final String MANIFEST_BUILD_JDK = "Build-Jdk";
+
+	private static final String PROPERTY_APP_NAME = "app.name";
+	private static final String PROPERTY_APP_VERSION = "app.version";
+	private static final String PROPERTY_APP_REVISION_VERSION = "app.revision.version";
+	private static final String PROPERTY_APP_REVISION_BRANCH = "app.revision.branch";
+	private static final String PROPERTY_APP_BUILD_DATE = "app.build.date";
+	private static final String PROPERTY_APP_BUILD_JDK = "app.build.jdk";
+
+	private static final String PROPERTY_JAVA_OS_NAME = "os.name";
+
+	private static final String PROPERTY_JAVA_SPEC_VENDOR = "java.specification.vendor";
+	private static final String PROPERTY_JAVA_SPEC_NAME = "java.specification.name";
+	private static final String PROPERTY_JAVA_SPEC_VERSION = "java.specification.version";
+
+	private static final String PROPERTY_JAVA_VERSION = "java.version";
+	private static final String PROPERTY_JAVA_VERSION_VM = "java.vm.version";
+	private static final String PROPERTY_JAVA_VERSION_RUNTIME = "java.runtime.version";
+
+	private static String getManifestValue( final String entry )
+	{
+		File jarFile = null;
+		InputStream jarFileStream = null;
+		JarInputStream jarStream = null;
+		String value = null;
+
+		try {
+			final String jarFilename = AppUtil.class.getProtectionDomain().getCodeSource().getLocation().toURI().getPath();
+			jarFile = new File( jarFilename );
+			jarFileStream = new FileInputStream( jarFile );
+			jarStream = new JarInputStream( jarFileStream );
+
+			final Manifest mf = jarStream.getManifest();
+			value = mf.getMainAttributes().getValue( entry );
+		} catch ( URISyntaxException | IOException e ) {
+			return value;
+		} finally {
+			Util.safeClose( jarStream );
+			Util.safeClose( jarFileStream );
+		}
+
+		return value;
+	}
+
+	public static String getRevisionVersion()
+	{
+		return AppUtil.getManifestValue( AppUtil.MANIFEST_REVISION_VERSION );
+	}
+
+	public static String getRevisionBranch()
+	{
+		return AppUtil.getManifestValue( AppUtil.MANIFEST_REVISION_BRANCH );
+	}
+
+	public static long getBuildTimestamp()
+	{
+		final String timestampRaw = AppUtil.getManifestValue( AppUtil.MANIFEST_BUILD_TIMESTAMP );
+		long timestamp = 0;
+
+		try {
+			timestamp = Long.valueOf( timestampRaw );
+			timestamp /= 1000L;
+		} catch ( NumberFormatException e ) {
+			timestamp = 0;
+		}
+
+		return timestamp;
+	}
+
+	public static String getBuildTime()
+	{
+		final long timestamp = AppUtil.getBuildTimestamp();
+		final String buildTime;
+
+		if ( timestamp > 0 ) {
+			final Instant time = Instant.ofEpochSecond( timestamp );
+			buildTime = DateTimeFormatter.RFC_1123_DATE_TIME.withZone( ZoneId.systemDefault() ).format( time );
+		} else {
+			buildTime = null;
+		}
+
+		return buildTime;
+	}
+
+	public static String getBuildJdk()
+	{
+		return AppUtil.getManifestValue( AppUtil.MANIFEST_BUILD_JDK );
+	}
+
+	private static String formatProperty( final String property )
+	{
+		return String.format( "%-" + AppUtil.PROPERTY_MAX_WIDTH + "s", property );
+	}
+
+	public static void logProperty( final Logger logger, final String propertyName, final String propertyValue )
+	{
+		logger.info( AppUtil.formatProperty( propertyName ) + propertyValue );
+	}
+
+	public static void logJavaProperty( Logger logger, final String javaProperty )
+	{
+		AppUtil.logProperty( logger, javaProperty, System.getProperty( javaProperty ) );
+	}
+
+	public static void logHeader( final Logger logger, final String appName, final String appVersion )
+	{
+		logger.info( "-------------------------------------------------------------------------------" );
+		logger.info( appName );
+		logger.info( "-------------------------------------------------------------------------------" );
+		logProperty( logger, AppUtil.PROPERTY_APP_NAME, appName );
+		logProperty( logger, AppUtil.PROPERTY_APP_VERSION, appVersion );
+		logProperty( logger, AppUtil.PROPERTY_APP_REVISION_VERSION, AppUtil.getRevisionVersion() );
+		logProperty( logger, AppUtil.PROPERTY_APP_REVISION_BRANCH, AppUtil.getRevisionBranch() );
+		logProperty( logger, AppUtil.PROPERTY_APP_BUILD_DATE, AppUtil.getBuildTime() );
+		logProperty( logger, AppUtil.PROPERTY_APP_BUILD_JDK, AppUtil.getBuildJdk() );
+		logJavaProperty( logger, AppUtil.PROPERTY_JAVA_OS_NAME );
+		logJavaProperty( logger, AppUtil.PROPERTY_JAVA_SPEC_VENDOR );
+		logJavaProperty( logger, AppUtil.PROPERTY_JAVA_SPEC_NAME );
+		logJavaProperty( logger, AppUtil.PROPERTY_JAVA_SPEC_VERSION );
+		logJavaProperty( logger, AppUtil.PROPERTY_JAVA_VERSION );
+		logJavaProperty( logger, AppUtil.PROPERTY_JAVA_VERSION_VM );
+		logJavaProperty( logger, AppUtil.PROPERTY_JAVA_VERSION_RUNTIME );
+		logger.info( "-------------------------------------------------------------------------------" );
+	}
+}