Replace explicit calls to initCause where possible

Where the exception being thrown has a constructor that takes a
Throwable, use that instead of instantiating the exception and then
explicitly calling initCause.

Change-Id: I06a0df407ba751a7af8c1c4a46f9e2714f13dbe3
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/ManifestParser.java

@@ -178,10 +178,7 @@ public class ManifestParser extends DefaultHandler {
 		try {
 			xr.parse(new InputSource(inputStream));
 		} catch (SAXException e) {
-			IOException error = new IOException(
-						RepoText.get().errorParsingManifestFile);
-			error.initCause(e);
-			throw error;
+			throw new IOException(RepoText.get().errorParsingManifestFile, e);
 		}
 	}
 

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/FileRepository.java

@@ -247,34 +247,30 @@ public class FileRepository extends Repository {
 	private void loadSystemConfig() throws IOException {
 		try {
 			systemConfig.load();
-		} catch (ConfigInvalidException e1) {
-			IOException e2 = new IOException(MessageFormat.format(JGitText
+		} catch (ConfigInvalidException e) {
+			throw new IOException(MessageFormat.format(JGitText
 					.get().systemConfigFileInvalid, systemConfig.getFile()
-					.getAbsolutePath(), e1));
-			e2.initCause(e1);
-			throw e2;
+							.getAbsolutePath(),
+					e), e);
 		}
 	}
 
 	private void loadUserConfig() throws IOException {
 		try {
 			userConfig.load();
-		} catch (ConfigInvalidException e1) {
-			IOException e2 = new IOException(MessageFormat.format(JGitText
+		} catch (ConfigInvalidException e) {
+			throw new IOException(MessageFormat.format(JGitText
 					.get().userConfigFileInvalid, userConfig.getFile()
-					.getAbsolutePath(), e1));
-			e2.initCause(e1);
-			throw e2;
+							.getAbsolutePath(),
+					e), e);
 		}
 	}
 
 	private void loadRepoConfig() throws IOException {
 		try {
 			repoConfig.load();
-		} catch (ConfigInvalidException e1) {
-			IOException e2 = new IOException(JGitText.get().unknownRepositoryFormat);
-			e2.initCause(e1);
-			throw e2;
+		} catch (ConfigInvalidException e) {
+			throw new IOException(JGitText.get().unknownRepositoryFormat, e);
 		}
 	}
 

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackBitmapIndex.java

@@ -97,12 +97,10 @@ public abstract class PackBitmapIndex {
 		try {
 			return read(fd, packIndex, reverseIndex);
 		} catch (IOException ioe) {
-			final String path = idxFile.getAbsolutePath();
-			final IOException err;
-			err = new IOException(MessageFormat.format(
-					JGitText.get().unreadablePackIndex, path));
-			err.initCause(ioe);
-			throw err;
+			throw new IOException(MessageFormat
+					.format(JGitText.get().unreadablePackIndex,
+							idxFile.getAbsolutePath()),
+					ioe);
 		} finally {
 			try {
 				fd.close();

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackIndex.java

@@ -99,11 +99,10 @@ public abstract class PackIndex
 		try {
 			return read(fd);
 		} catch (IOException ioe) {
-			final String path = idxFile.getAbsolutePath();
-			final IOException err;
-			err = new IOException(MessageFormat.format(JGitText.get().unreadablePackIndex, path));
-			err.initCause(ioe);
-			throw err;
+			throw new IOException(MessageFormat
+					.format(JGitText.get().unreadablePackIndex,
+							idxFile.getAbsolutePath()),
+					ioe);
 		} finally {
 			try {
 				fd.close();

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/RefDirectory.java

@@ -1184,10 +1184,8 @@ public class RefDirectory extends RefDatabase {
 				n--;
 			String content = RawParseUtils.decode(buf, 0, n);
 
-			IOException ioException = new IOException(MessageFormat.format(JGitText.get().notARef,
-					name, content));
-			ioException.initCause(notRef);
-			throw ioException;
+			throw new IOException(MessageFormat.format(JGitText.get().notARef,
+					name, content), notRef);
 		}
 		return new LooseUnpeeled(otherSnapshot, name, id);
 	}

org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriter.java

@@ -1531,9 +1531,7 @@ public class PackWriter implements AutoCloseable {
 			if (err instanceof IOException)
 				throw (IOException) err;
 
-			IOException fail = new IOException(err.getMessage());
-			fail.initCause(err);
-			throw fail;
+			throw new IOException(err.getMessage(), err);
 		}
 		endPhase(monitor);
 	}

org.eclipse.jgit/src/org/eclipse/jgit/lib/IndexDiff.java

@@ -538,11 +538,9 @@ public class IndexDiff {
 							.equals(localIgnoreSubmoduleMode))
 						continue;
 				} catch (ConfigInvalidException e) {
-					IOException e1 = new IOException(MessageFormat.format(
+					throw new IOException(MessageFormat.format(
 							JGitText.get().invalidIgnoreParamSubmodule,
-							smw.getPath()));
-					e1.initCause(e);
-					throw e1;
+							smw.getPath()), e);
 				}
 				Repository subRepo = smw.getRepository();
 				if (subRepo != null) {

org.eclipse.jgit/src/org/eclipse/jgit/storage/file/FileBasedConfig.java

@@ -171,9 +171,8 @@ public class FileBasedConfig extends StoredConfig {
 			clear();
 			snapshot = newSnapshot;
 		} catch (IOException e) {
-			final IOException e2 = new IOException(MessageFormat.format(JGitText.get().cannotReadFile, getFile()));
-			e2.initCause(e);
-			throw e2;
+			throw new IOException(MessageFormat
+					.format(JGitText.get().cannotReadFile, getFile()), e);
 		} catch (ConfigInvalidException e) {
 			throw new ConfigInvalidException(MessageFormat.format(JGitText.get().cannotReadFile, getFile()), e);
 		}

org.eclipse.jgit/src/org/eclipse/jgit/transport/AmazonS3.java

@@ -707,10 +707,10 @@ public class AmazonS3 {
 					try {
 						xr.parse(new InputSource(in));
 					} catch (SAXException parsingError) {
-						final IOException p;
-						p = new IOException(MessageFormat.format(JGitText.get().errorListing, prefix));
-						p.initCause(parsingError);
-						throw p;
+						throw new IOException(
+								MessageFormat.format(
+										JGitText.get().errorListing, prefix),
+								parsingError);
 					} finally {
 						in.close();
 					}

org.eclipse.jgit/src/org/eclipse/jgit/transport/HttpAuthMethod.java

@@ -549,9 +549,7 @@ abstract class HttpAuthMethod {
 				conn.setRequestProperty(HDR_AUTHORIZATION, getType().getSchemeName()
 						+ " " + Base64.encodeBytes(token)); //$NON-NLS-1$
 			} catch (GSSException e) {
-				IOException ioe = new IOException();
-				ioe.initCause(e);
-				throw ioe;
+				throw new IOException(e);
 			}
 		}
 	}

org.eclipse.jgit/src/org/eclipse/jgit/transport/WalkEncryption.java

@@ -115,10 +115,9 @@ abstract class WalkEncryption {
 	}
 
 	IOException error(final Throwable why) {
-		final IOException e;
-		e = new IOException(MessageFormat.format(JGitText.get().encryptionError, why.getMessage()));
-		e.initCause(why);
-		return e;
+		return new IOException(MessageFormat
+				.format(JGitText.get().encryptionError,
+				why.getMessage()), why);
 	}
 
 	private static class NoEncryption extends WalkEncryption {