+++ /dev/null
-package org.apache.lucene.util;
-
-/**
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * The ASF licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import java.io.Closeable;
-import java.io.IOException;
-import java.lang.reflect.Method;
-
-/** This class emulates the new Java 7 "Try-With-Resources" statement.
- * Remove once Lucene is on Java 7.
- * @lucene.internal */
-public final class IOUtils {
-
- private IOUtils() {} // no instance
-
- /**
- * <p>Closes all given <tt>Closeable</tt>s, suppressing all thrown exceptions. Some of the <tt>Closeable</tt>s
- * may be null, they are ignored. After everything is closed, method either throws <tt>priorException</tt>,
- * if one is supplied, or the first of suppressed exceptions, or completes normally.</p>
- * <p>Sample usage:<br/>
- * <pre>
- * Closeable resource1 = null, resource2 = null, resource3 = null;
- * ExpectedException priorE = null;
- * try {
- * resource1 = ...; resource2 = ...; resource3 = ...; // Acquisition may throw ExpectedException
- * ..do..stuff.. // May throw ExpectedException
- * } catch (ExpectedException e) {
- * priorE = e;
- * } finally {
- * closeSafely(priorE, resource1, resource2, resource3);
- * }
- * </pre>
- * </p>
- * @param priorException <tt>null</tt> or an exception that will be rethrown after method completion
- * @param objects objects to call <tt>close()</tt> on
- */
- public static <E extends Exception> void closeWhileHandlingException(E priorException, Closeable... objects) throws E, IOException {
- Throwable th = null;
-
- for (Closeable object : objects) {
- try {
- if (object != null) {
- object.close();
- }
- } catch (Throwable t) {
- addSuppressed((priorException == null) ? th : priorException, t);
- if (th == null) {
- th = t;
- }
- }
- }
-
- if (priorException != null) {
- throw priorException;
- } else if (th != null) {
- if (th instanceof IOException) throw (IOException) th;
- if (th instanceof RuntimeException) throw (RuntimeException) th;
- if (th instanceof Error) throw (Error) th;
- throw new RuntimeException(th);
- }
- }
-
- /** @see #closeWhileHandlingException(Exception, Closeable...) */
- public static <E extends Exception> void closeWhileHandlingException(E priorException, Iterable<Closeable> objects) throws E, IOException {
- Throwable th = null;
-
- for (Closeable object : objects) {
- try {
- if (object != null) {
- object.close();
- }
- } catch (Throwable t) {
- addSuppressed((priorException == null) ? th : priorException, t);
- if (th == null) {
- th = t;
- }
- }
- }
-
- if (priorException != null) {
- throw priorException;
- } else if (th != null) {
- if (th instanceof IOException) throw (IOException) th;
- if (th instanceof RuntimeException) throw (RuntimeException) th;
- if (th instanceof Error) throw (Error) th;
- throw new RuntimeException(th);
- }
- }
-
- /**
- * Closes all given <tt>Closeable</tt>s. Some of the
- * <tt>Closeable</tt>s may be null; they are
- * ignored. After everything is closed, the method either
- * throws the first exception it hit while closing, or
- * completes normally if there were no exceptions.
- *
- * @param objects
- * objects to call <tt>close()</tt> on
- */
- public static void close(Closeable... objects) throws IOException {
- Throwable th = null;
-
- for (Closeable object : objects) {
- try {
- if (object != null) {
- object.close();
- }
- } catch (Throwable t) {
- addSuppressed(th, t);
- if (th == null) {
- th = t;
- }
- }
- }
-
- if (th != null) {
- if (th instanceof IOException) throw (IOException) th;
- if (th instanceof RuntimeException) throw (RuntimeException) th;
- if (th instanceof Error) throw (Error) th;
- throw new RuntimeException(th);
- }
- }
-
- /**
- * @see #close(Closeable...)
- */
- public static void close(Iterable<? extends Closeable> objects) throws IOException {
- Throwable th = null;
-
- for (Closeable object : objects) {
- try {
- if (object != null) {
- object.close();
- }
- } catch (Throwable t) {
- addSuppressed(th, t);
- if (th == null) {
- th = t;
- }
- }
- }
-
- if (th != null) {
- if (th instanceof IOException) throw (IOException) th;
- if (th instanceof RuntimeException) throw (RuntimeException) th;
- if (th instanceof Error) throw (Error) th;
- throw new RuntimeException(th);
- }
- }
-
- /**
- * Closes all given <tt>Closeable</tt>s, suppressing all thrown exceptions.
- * Some of the <tt>Closeable</tt>s may be null, they are ignored.
- *
- * @param objects
- * objects to call <tt>close()</tt> on
- */
- public static void closeWhileHandlingException(Closeable... objects) throws IOException {
- for (Closeable object : objects) {
- try {
- if (object != null) {
- object.close();
- }
- } catch (Throwable t) {
- }
- }
- }
-
- /**
- * @see #closeWhileHandlingException(Closeable...)
- */
- public static void closeWhileHandlingException(Iterable<? extends Closeable> objects) throws IOException {
- for (Closeable object : objects) {
- try {
- if (object != null) {
- object.close();
- }
- } catch (Throwable t) {
- }
- }
- }
-
- /** This reflected {@link Method} is {@code null} before Java 7 */
- private static final Method SUPPRESS_METHOD;
- static {
- Method m;
- try {
- m = Throwable.class.getMethod("addSuppressed", Throwable.class);
- } catch (Exception e) {
- m = null;
- }
- SUPPRESS_METHOD = m;
- }
-
- /** adds a Throwable to the list of suppressed Exceptions of the first Throwable (if Java 7 is detected)
- * @param exception this exception should get the suppressed one added
- * @param suppressed the suppressed exception
- */
- private static final void addSuppressed(Throwable exception, Throwable suppressed) {
- if (SUPPRESS_METHOD != null && exception != null && suppressed != null) {
- try {
- SUPPRESS_METHOD.invoke(exception, suppressed);
- } catch (Exception e) {
- // ignore any exceptions caused by invoking (e.g. security constraints)
- }
- }
- }
-
-}
fnp / pylucene.git / blobdiff