1// Copyright (c) 2011, Mike Samuel 2// All rights reserved. 3// 4// Redistribution and use in source and binary forms, with or without 5// modification, are permitted provided that the following conditions 6// are met: 7// 8// Redistributions of source code must retain the above copyright 9// notice, this list of conditions and the following disclaimer. 10// Redistributions in binary form must reproduce the above copyright 11// notice, this list of conditions and the following disclaimer in the 12// documentation and/or other materials provided with the distribution. 13// Neither the name of the OWASP nor the names of its contributors may 14// be used to endorse or promote products derived from this software 15// without specific prior written permission. 16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 19// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 20// COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 21// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 22// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 23// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 24// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 26// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27// POSSIBILITY OF SUCH DAMAGE. 28 29package org.owasp.html; 30 31import com.google.common.base.Throwables; 32 33/** 34 * Receives notification of problems. 35 * 36 * @author Mike Samuel <mikesamuel@gmail.com> 37 */ 38public interface Handler<T> { 39 40 void handle(T x); 41 42 /** A handler that does nothing given any input. */ 43 public static final Handler<Object> DO_NOTHING = new Handler<Object>() { 44 public void handle(Object x) { 45 // Really, do nothing. 46 } 47 }; 48 49 /** 50 * A handler that re-raises an error, wrapping it in a runtime exception if 51 * necessary. 52 */ 53 public static final Handler<Throwable> PROPAGATE = new Handler<Throwable>() { 54 public void handle(Throwable th) { 55 Throwables.propagate(th); 56 } 57 }; 58} 59