/*
* 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.taskdefs;
import java.util.Vector;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.input.DefaultInputHandler;
import org.apache.tools.ant.input.GreedyInputHandler;
import org.apache.tools.ant.input.InputHandler;
import org.apache.tools.ant.input.InputRequest;
import org.apache.tools.ant.input.MultipleChoiceInputRequest;
import org.apache.tools.ant.input.PropertyFileInputHandler;
import org.apache.tools.ant.types.EnumeratedAttribute;
import org.apache.tools.ant.util.ClasspathUtils;
import org.apache.tools.ant.util.StringUtils;
/**
* Reads an input line from the console.
*
* @since Ant 1.5
*
* @ant.task category="control"
*/
public class Input extends Task {
/**
* Represents an InputHandler.
*/
public class Handler extends DefBase {
private String refid = null;
private HandlerType type = null;
private String classname = null;
/**
* Specify that the handler is a reference on the project;
* this allows the use of a custom inputhandler.
* @param refid the String refid.
*/
public void setRefid(String refid) {
this.refid = refid;
}
/**
* Get the refid of this Handler.
* @return String refid.
*/
public String getRefid() {
return refid;
}
/**
* Set the InputHandler classname.
* @param classname the String classname.
*/
public void setClassname(String classname) {
this.classname = classname;
}
/**
* Get the classname of the InputHandler.
* @return String classname.
*/
public String getClassname() {
return classname;
}
/**
* Set the handler type.
* @param type a HandlerType.
*/
public void setType(HandlerType type) {
this.type = type;
}
/**
* Get the handler type.
* @return a HandlerType object.
*/
public HandlerType getType() {
return type;
}
private InputHandler getInputHandler() {
if (type != null) {
return type.getInputHandler();
}
if (refid != null) {
try {
return (InputHandler) (getProject().getReference(refid));
} catch (ClassCastException e) {
throw new BuildException(
refid + " does not denote an InputHandler", e);
}
}
if (classname != null) {
return (InputHandler) (ClasspathUtils.newInstance(classname,
createLoader(), InputHandler.class));
}
throw new BuildException(
"Must specify refid, classname or type");
}
}
/**
* EnumeratedAttribute representing the built-in input handler types:
* "default", "propertyfile", "greedy".
*/
public static class HandlerType extends EnumeratedAttribute {
private static final String[] VALUES
= {"default", "propertyfile", "greedy"};
private static final InputHandler[] HANDLERS
= {new DefaultInputHandler(),
new PropertyFileInputHandler(),
new GreedyInputHandler()};
/** {@inheritDoc} */
public String[] getValues() {
return VALUES;
}
private InputHandler getInputHandler() {
return HANDLERS[getIndex()];
}
}
private String validargs = null;
private String message = "";
private String addproperty = null;
private String defaultvalue = null;
private Handler handler = null;
private boolean messageAttribute;
/**
* Defines valid input parameters as comma separated strings. If set, input
* task will reject any input not defined as accepted and requires the user
* to reenter it. Validargs are case sensitive. If you want 'a' and 'A' to
* be accepted you need to define both values as accepted arguments.
*
* @param validargs A comma separated String defining valid input args.
*/
public void setValidargs (String validargs) {
this.validargs = validargs;
}
/**
* Defines the name of a property to be created from input. Behaviour is
* according to property task which means that existing properties
* cannot be overridden.
*
* @param addproperty Name for the property to be created from input
*/
public void setAddproperty (String addproperty) {
this.addproperty = addproperty;
}
/**
* Sets the Message which gets displayed to the user during the build run.
* @param message The message to be displayed.
*/
public void setMessage (String message) {
this.message = message;
messageAttribute = true;
}
/**
* Defines the default value of the property to be created from input.
* Property value will be set to default if not input is received.
*
* @param defaultvalue Default value for the property if no input
* is received
*/
public void setDefaultvalue (String defaultvalue) {
this.defaultvalue = defaultvalue;
}
/**
* Set a multiline message.
* @param msg The message to be displayed.
*/
public void addText(String msg) {
if (messageAttribute && "".equals(msg.trim())) {
return;
}
message += getProject().replaceProperties(msg);
}
/**
* No arg constructor.
*/
public Input () {
}
/**
* Actual method executed by ant.
* @throws BuildException on error
*/
public void execute () throws BuildException {
if (addproperty != null
&& getProject().getProperty(addproperty) != null) {
log("skipping " + getTaskName() + " as property " + addproperty
+ " has already been set.");
return;
}
InputRequest request = null;
if (validargs != null) {
Vector accept = StringUtils.split(validargs, ',');
request = new MultipleChoiceInputRequest(message, accept);
} else {
request = new InputRequest(message);
}
request.setDefaultValue(defaultvalue);
InputHandler h = handler == null
? getProject().getInputHandler()
: handler.getInputHandler();
h.handleInput(request);
String value = request.getInput();
if ((value == null || value.trim().length() == 0)
&& defaultvalue != null) {
value = defaultvalue;
}
if (addproperty != null && value != null) {
getProject().setNewProperty(addproperty, value);
}
}
/**
* Create a nested handler element.
* @return a Handler for this Input task.
*/
public Handler createHandler() {
if (handler != null) {
throw new BuildException(
"Cannot define > 1 nested input handler");
}
handler = new Handler();
return handler;
}
}
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