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