| /* |
| * 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 |
| * 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. |
| * |
| */ |
| |
| package org.apache.tools.ant.input; |
| |
| import java.io.FileInputStream; |
| import java.io.IOException; |
| import java.util.Properties; |
| |
| import org.apache.tools.ant.BuildException; |
| |
| /** |
| * 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. |
| * |
| * @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. |
| * @param request an input request. |
| * |
| * @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); |
| } |
| } |
| } |
| |
| } |