youys
/
ant

 
			
			   
				 
					
						
						
							
							<!DOCTYPE html>
<!--
   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

       https://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.
-->
<html lang="en">

<head>
<link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
<title>Input Task</title>
</head>

<body>

<h2 id="input">Input</h2>
<h3>Description</h3>

<p>Allows user interaction during the build process by prompting for input.  To do so, it uses the
configured <a href="../inputhandler.html">InputHandler</a>.</p>

<p>The prompt can be set via the <var>message</var> attribute or as character data nested into the
element.</p>

<p>Optionally a set of valid input arguments can be defined via the <var>validargs</var>
attribute. <code>Input</code> task will not accept a value that doesn't match one of the
predefined.</p>

<p>Optionally a property can be created from the value entered by the user. This property can then
be used during the following build run. <code>Input</code> then behaves
as <a href="property.html">property task</a> which means that existing properties cannot be
overridden.  <em>Since Apache Ant 1.6</em>, <code>&lt;input&gt;</code> will not prompt for input if
a property should be set by the task that has already been set in the project (and the task wouldn't
have any effect).</p>

<p>Historically, a regular complaint about this task has been that it echoes characters to the
console, this is a critical security defect, we must fix it immediately, etc, etc.  This problem was
due to the lack in early versions of Java of a (fully functional) facility for handling secure
console input.  In Java 6 that shortcoming in Java's API was addressed and Ant versions 1.7.1 and
1.8 have added support for Java 6 secure console input feature (see <a href="#handler.type">handler
type</a>).</p>

<p>IDE behaviour depends upon the IDE: some hang waiting for input, some let you type it in. For
this situation, place the password in a (secured) property file and load in before
the <code>input</code> task.</p>

<h3>Parameters</h3>
<table class="attr">
  <tr>
    <th scope="col">Attribute</th>
    <th scope="col">Description</th>
    <th scope="col">Required</th>
  </tr>
  <tr>
    <td>message</td>
    <td>the Message which gets displayed to the user during the build run.</td>
    <td>No</td>
  </tr>
  <tr>
    <td>validargs</td>
    <td>comma separated String containing valid input arguments. If set, <code>input</code> task
      will reject any input not defined here. Comparison of input to <var>validargs</var> is case
      sensitive. If you want <q>a</q> and
    <q>A</q> to be accepted you will need to define both arguments within <var>validargs</var>.</td>
    <td>No</td>
  </tr>
  <tr>
    <td>addproperty</td>
    <td>the name of a property to be created from input. Behaviour is equal
      to <a href="property.html">property task</a> which means that existing properties cannot be
      overridden.</td>
    <td>No</td>
  </tr>
  <tr>
    <td>defaultvalue</td>
    <td>Defines the default value of the property to be created from input.  Property value will be
      set to default if no input is received.</td>
    <td>No</td>
  </tr>
</table>
<h3>Parameters specified as nested elements</h3>
<h4>Handler</h4>
<p><em>Since Ant 1.7</em>, a nested <code>&lt;handler&gt;</code> element can be used to specify
an <code>InputHandler</code>, so that different <code>InputHandler</code>s may be used among
different <code>Input</code> tasks.</p>

<table class="attr">
  <tr>
    <th scope="col">Attribute</th>
    <th scope="col">Description</th>
    <th scope="col">Required</th>
  </tr>
  <tr id="handler.type">
    <td>type</td>
    <td>one of <q>default</q>, <q>propertyfile</q>, <q>greedy</q>, or <q>secure</q> (<em>since Ant
      1.8</em>).</td>
    <td rowspan="3">One of these</td>
  </tr>
  <tr>
    <td>refid</td>
    <td class="left">Reference to an <code>InputHandler</code> defined elsewhere in the
      project.</td>
  </tr>
  <tr>
    <td>classname</td>
    <td class="left">The name of an <code>InputHandler</code> subclass.</td>
  </tr>
  <tr>
    <td>classpath</td>
    <td>The classpath to use with <var>classname</var>.</td>
    <td>No</td>
  </tr>
  <tr>
    <td>classpathref</td>
    <td>The refid of a classpath to use with <var>classname</var>.</td>
    <td>No</td>
  </tr>
  <tr>
    <td>loaderref</td>
    <td>The refid of a classloader to use with <var>classname</var>.
    </td>
    <td>No</td>
  </tr>
</table>
<p>The classpath can also be specified by means of one or more nested <code>&lt;classpath&gt;</code>
elements.</p>

<h3>Examples</h3>
<p>Pause the build run until return key is pressed when using
the <a href="../inputhandler.html#defaulthandler">default InputHandler</a>, the concrete behavior is
defined by the <code>InputHandler</code> implementation you use.</p>
<pre>&lt;input/&gt;</pre>

<p>Display the message <q>Press Return key to continue...</q> and pause the build run until return
key is pressed (again, the concrete behavior is implementation dependent).</p>
<pre>&lt;input&gt;Press Return key to continue...&lt;/input&gt;</pre>

<p>Display the message <q>Press Return key to continue...</q> and pause the build run until return
key is pressed (see above).</p>
<pre>&lt;input message=&quot;Press Return key to continue...&quot;/&gt;</pre>

<p>Display the message <q>All data is going to be deleted from DB continue (y/n)?</q> and
require <q>y</q> to continue build or <q>n</q> to exit build with following message <q>Build aborted
by user.</q>.</p>
<pre>
&lt;input message=&quot;All data is going to be deleted from DB continue (y/n)?&quot;
       validargs=&quot;y,n&quot;
       addproperty=&quot;do.delete&quot;/&gt;
&lt;condition property=&quot;do.abort&quot;&gt;
  &lt;equals arg1=&quot;n&quot; arg2=&quot;${do.delete}&quot;/&gt;
&lt;/condition&gt;
&lt;fail if=&quot;do.abort&quot;&gt;Build aborted by user.&lt;/fail&gt;
</pre>

<p>Display the message <q>Please enter db-username:</q> and set the property <code>db.user</code> to
the value entered by the user.</p>
<pre>
&lt;input message=&quot;Please enter db-username:&quot;
       addproperty=&quot;db.user&quot;/&gt;</pre>

<p>Same as above, but set <code>db.user</code> to the value <q>Scott-Tiger</q> if the user enters no
value (simply presses <q>return</q>).</p>
<pre>
&lt;input message=&quot;Please enter db-username:&quot;
       addproperty=&quot;db.user&quot;
       defaultvalue=&quot;Scott-Tiger&quot;/&gt;</pre>

</body>
</html>