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Commons IO example source code file (TaggedInputStream.java)
The Commons IO TaggedInputStream.java source code/* * 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. */ package org.apache.commons.io.input; import java.io.IOException; import java.io.InputStream; import java.io.Serializable; import java.util.UUID; import org.apache.commons.io.TaggedIOException; /** * An input stream decorator that tags potential exceptions so that the * stream that caused the exception can easily be identified. This is * done by using the {@link TaggedIOException} class to wrap all thrown * {@link IOException}s. See below for an example of using this class. * <pre> * TaggedInputStream stream = new TaggedInputStream(...); * try { * // Processing that may throw an IOException either from this stream * // or from some other IO activity like temporary files, etc. * processStream(stream); * } catch (IOException e) { * if (stream.isCauseOf(e)) { * // The exception was caused by this stream. * // Use e.getCause() to get the original exception. * } else { * // The exception was caused by something else. * } * } * </pre> * <p> * Alternatively, the {@link #throwIfCauseOf(Throwable)} method can be * used to let higher levels of code handle the exception caused by this * stream while other processing errors are being taken care of at this * lower level. * <pre> * TaggedInputStream stream = new TaggedInputStream(...); * try { * processStream(stream); * } catch (IOException e) { * stream.throwIfCauseOf(e); * // ... or process the exception that was caused by something else * } * </pre> * * @see TaggedIOException * @since Commons IO 2.0 */ public class TaggedInputStream extends ProxyInputStream { /** * The unique tag associated with exceptions from stream. */ private final Serializable tag = UUID.randomUUID(); /** * Creates a tagging decorator for the given input stream. * * @param proxy input stream to be decorated */ public TaggedInputStream(InputStream proxy) { super(proxy); } /** * Tests if the given exception was caused by this stream. * * @param exception an exception * @return <code>true if the exception was thrown by this stream, * <code>false otherwise */ public boolean isCauseOf(Throwable exception) { return TaggedIOException.isTaggedWith(exception, tag); } /** * Re-throws the original exception thrown by this stream. This method * first checks whether the given exception is a {@link TaggedIOException} * wrapper created by this decorator, and then unwraps and throws the * original wrapped exception. Returns normally if the exception was * not thrown by this stream. * * @param throwable an exception * @throws IOException original exception, if any, thrown by this stream */ public void throwIfCauseOf(Throwable throwable) throws IOException { TaggedIOException.throwCauseIfTaggedWith(throwable, tag); } /** * Tags any IOExceptions thrown, wrapping and re-throwing. * * @param e The IOException thrown * @throws IOException if an I/O error occurs */ @Override protected void handleIOException(IOException e) throws IOException { throw new TaggedIOException(e, tag); } } Other Commons IO examples (source code examples)Here is a short list of links related to this Commons IO TaggedInputStream.java source code file: |
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