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/*
* The Apache Software License, Version 1.1
*
* Copyright (c) 2002 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "Ant" and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
* nor may "Apache" appear in their names without prior written
* permission of the Apache Group.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package org.apache.tools.ant.input;
import org.apache.tools.ant.BuildException;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;
/**
* Reads input from a property file, the file name is read from the
* system property ant.input.properties, the prompt is the key for input.
*
* @author <a href="mailto:stefan.bodewig@epost.de">Stefan Bodewig</a>
* @version $Revision: 1.1 $
* @since Ant 1.5
*/
public class PropertyFileInputHandler implements InputHandler {
private Properties props = null;
/**
* Name of the system property we expect to hold the file name.
*/
public static final String FILE_NAME_KEY = "ant.input.properties";
/**
* Empty no-arg constructor.
*/
public PropertyFileInputHandler() {
}
/**
* Picks up the input from a property, using the prompt as the
* name of the property.
*
* @exception BuildException if no property of that name can be found.
*/
public void handleInput(InputRequest request) throws BuildException {
readProps();
Object o = props.get(request.getPrompt());
if (o == null) {
throw new BuildException("Unable to find input for \'"
+ request.getPrompt()+"\'");
}
request.setInput(o.toString());
if (!request.isInputValid()) {
throw new BuildException("Found invalid input " + o
+ " for \'" + request.getPrompt() + "\'");
}
}
/**
* Reads the properties file if it hasn't already been read.
*/
private synchronized void readProps() throws BuildException {
if (props == null) {
String propsFile = System.getProperty(FILE_NAME_KEY);
if (propsFile == null) {
throw new BuildException("System property "
+ FILE_NAME_KEY
+ " for PropertyFileInputHandler not"
+ " set");
}
props = new Properties();
try {
props.load(new FileInputStream(propsFile));
} catch (IOException e) {
throw new BuildException("Couldn't load " + propsFile, e);
}
}
}
}
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