Only build 1 pkg per OS, load SWT libs @ runtime

git-svn-id: https://joinup.ec.europa.eu/svn/pdf-over/trunk@244 174cde9d-5d70-4d2a-aa98-46368bc2aaf7

1 files changed, 89 insertions, 0 deletions

diff --git a/pdf-over-gui/src/main/java/at/asit/pdfover/gui/utils/SWTLoader.java b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/utils/SWTLoader.java
new file mode 100644
index 00000000..f966bb71
--- /dev/null
+++ b/pdf-over-gui/src/main/java/at/asit/pdfover/gui/utils/SWTLoader.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright 2012 by A-SIT, Secure Information Technology Center Austria
+ *
+ * Licensed under the EUPL, Version 1.1 or - as soon they will be approved by
+ * the European Commission - subsequent versions of the EUPL (the "Licence");
+ * You may not use this work except in compliance with the Licence.
+ * You may obtain a copy of the Licence at:
+ * http://joinup.ec.europa.eu/software/page/eupl
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the Licence is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing permissions and
+ * limitations under the Licence.
+ */
+package at.asit.pdfover.gui.utils;
+
+// Imports
+import java.io.File;
+import java.lang.reflect.Method;
+import java.net.URL;
+import java.net.URLClassLoader;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import at.asit.pdfover.gui.exceptions.InitializationException;
+
+/**
+ * 
+ */
+@SuppressWarnings("nls")
+public class SWTLoader {
+	/**
+	 * SLF4J Logger instance
+	 **/
+	private static final Logger log = LoggerFactory.getLogger(SWTLoader.class);
+
+	/**
+	 * Load the SWT library for this OS
+	 * @throws InitializationException Loading failed
+	 */
+	public static void loadSWT() throws InitializationException {
+		try {
+			log.debug("loading " + getSwtJarName());
+			URLClassLoader cl = (URLClassLoader)SWTLoader.class.getClassLoader();
+			Method addUrlMethod = URLClassLoader.class.getDeclaredMethod("addURL", URL.class);
+			addUrlMethod.setAccessible(true);
+
+			String swtLibPath = "lib-swt/" + getSwtJarName();
+			File swtLib = new File(swtLibPath);
+			if (!swtLib.isFile())
+				throw new SWTLoadFailedException("Library " + swtLibPath + " not found");
+			log.debug("Adding " + swtLib + " to ClassLoader...");
+			addUrlMethod.invoke(cl, swtLib.toURI().toURL());
+			log.debug("Success.");
+		} catch (Exception e) {
+			throw new InitializationException("SWT loading failed", e);
+		}
+	}
+
+	private static int getArchBits() {
+		String arch = System.getProperty("os.arch");
+		return arch.contains("64") ? 64 : 32;
+	}
+
+	private static String getSwtJarName() throws SWTLoadFailedException {
+		String os = System.getProperty("os.name").toLowerCase();
+		if (os.contains("win"))
+			os = "windows";
+		else if (os.contains("mac"))
+			os = "mac";
+		else if (os.contains("linux") || os.contains("nix"))
+			os = "linux";
+		else {
+			log.error("Unknown OS: " + os);
+			throw new SWTLoadFailedException("Unknown OS: " + os);
+		}
+		return "swt-" + os + "-" + getArchBits() + ".jar";
+	}
+
+	private static class SWTLoadFailedException extends Exception {
+		private static final long serialVersionUID = 1L;
+
+		SWTLoadFailedException(String msg) {
+			super(msg);
+		}
+	}
+}