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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
* 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.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.util.KeepAliveInputStream;
/**
* Prompts on System.err, reads input from System.in
*
* @since Ant 1.5
*/
public class DefaultInputHandler implements InputHandler {
/**
* Empty no-arg constructor
*/
public DefaultInputHandler() {
}
/**
* Prompts and requests input. May loop until a valid input has
* been entered.
* @param request the request to handle
* @throws BuildException if not possible to read from console
*/
public void handleInput(InputRequest request) throws BuildException {
String prompt = getPrompt(request);
BufferedReader r = null;
try {
r = new BufferedReader(new InputStreamReader(getInputStream()));
do {
System.err.println(prompt);
System.err.flush();
try {
String input = r.readLine();
request.setInput(input);
} catch (IOException e) {
throw new BuildException("Failed to read input from"
+ " Console.", e);
}
} while (!request.isInputValid());
} finally {
if (r != null) {
try {
r.close();
} catch (IOException e) {
throw new BuildException("Failed to close input.", e);
}
}
}
}
/**
* Constructs user prompt from a request.
*
* <p>This implementation adds (choice1,choice2,choice3,...) to the
* prompt for <code>MultipleChoiceInputRequest</code>s.</p>
*
* @param request the request to construct the prompt for.
* Must not be <code>null</code>.
* @return the prompt to ask the user
*/
protected String getPrompt(InputRequest request) {
String prompt = request.getPrompt();
String def = request.getDefaultValue();
if (request instanceof MultipleChoiceInputRequest) {
StringBuilder sb = new StringBuilder(prompt).append(" (");
boolean first = true;
for (String next : ((MultipleChoiceInputRequest) request).getChoices()) {
if (!first) {
sb.append(", ");
}
if (next.equals(def)) {
sb.append('[');
}
sb.append(next);
if (next.equals(def)) {
sb.append(']');
}
first = false;
}
sb.append(")");
return sb.toString();
} else if (def != null) {
return prompt + " [" + def + "]";
} else {
return prompt;
}
}
/**
* Returns the input stream from which the user input should be read.
* @return the input stream from which the user input should be read.
*/
protected InputStream getInputStream() {
return KeepAliveInputStream.wrapSystemIn();
}
}
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