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-<!--
- 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
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- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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-<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
-<html>
-<head>
-<meta http-equiv="Content-Language" content="en-us">
-<link rel="stylesheet" type="text/css" href="stylesheets/style.css">
-<title>InputHandler</title>
-</head>
-
-<body>
-<h1>InputHandler</h1>
-
-<h2>Overview</h2>
-
-<p>When a task wants to prompt a user for input, it doesn't simply
-read the input from the console as this would make it impossible to
-embed Apache Ant in an IDE. Instead it asks an implementation of the
-<code>org.apache.tools.ant.input.InputHandler</code> interface to
-prompt the user and hand the user input back to the task.</p>
-
-<p>To do this, the task creates an <code>InputRequest</code> object
-and passes it to the <code>InputHandler</code> Such an
-<code>InputRequest</code> may know whether a given user input is valid
-and the <code>InputHandler</code> is supposed to reject all invalid
-input.</p>
-
-<p>Exactly one <code>InputHandler</code> instance is associated with
-every Ant process, users can specify the implementation using the
-<code>-inputhandler</code> command line switch.</p>
-
-<h2>InputHandler</h2>
-
-<p>The <code>InputHandler</code> interface contains exactly one
-method</p>
-
-<pre>
- void handleInput(InputRequest request)
- throws org.apache.tools.ant.BuildException;
-</pre>
-
-<p>with some pre- and postconditions. The main postcondition is that
-this method must not return unless the <code>request</code> considers
-the user input valid, it is allowed to throw an exception in this
-situation.</p>
-
-<p>Ant comes with three built-in implementations of this interface:</p>
-
-<h3><a name="defaulthandler">DefaultInputHandler</a></h3>
-
-<p>This is the implementation you get, when you don't use the
-<code>-inputhandler</code> command line switch at all. This
-implementation will print the prompt encapsulated in the
-<code>request</code> object to Ant's logging system and re-prompt for
-input until the user enters something that is considered valid input
-by the <code>request</code> object. Input will be read from the
-console and the user will need to press the Return key.</p>
-
-<h3>PropertyFileInputHandler</h3>
-
-<p>This implementation is useful if you want to run unattended build
-processes. It reads all input from a properties file and makes the
-build fail if it cannot find valid input in this file. The name of
-the properties file must be specified in the Java system property
-<code>ant.input.properties</code>.</p>
-
-<p>The prompt encapsulated in a <code>request</code> will be used as
-the key when looking up the input inside the properties file. If no
-input can be found, the input is considered invalid and an exception
-will be thrown.</p>
-
-<p><strong>Note</strong> that <code>ant.input.properties</code> must
-be a Java system property, not an Ant property. I.e. you cannot
-define it as a simple parameter to <code>ant</code>, but you can
-define it inside the <code>ANT_OPTS</code> environment variable.</p>
-
-<h3>GreedyInputHandler</h3>
-
-<p>Like the default implementation, this InputHandler reads from standard
-input. However, it consumes <i>all</i> available input. This behavior is
-useful for sending Ant input via an OS pipe. <b>Since Ant 1.7</b>.</p>
-
-<h3>SecureInputHandler</h3>
-
-<p>This InputHandler calls <code>System.console().readPassword()</code>,
-available since Java 1.6. On earlier platforms it falls back to the
-behavior of DefaultInputHandler. <b>Since Ant 1.7.1</b>.</p>
-
-<h2>InputRequest</h2>
-
-<p>Instances of <code>org.apache.tools.ant.input.InputRequest</code>
-encapsulate the information necessary to ask a user for input and
-validate this input.</p>
-
-<p>The instances of <code>InputRequest</code> itself will accept any
-input, but subclasses may use stricter validations.
-<code>org.apache.tools.ant.input.MultipleChoiceInputRequest</code>
-should be used if the user input must be part of a predefined set of
-choices.</p>
-
-
-</html>