antliscence/src/main/org/apache/tools/ant/taskdefs/Input.java

/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001-2002 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:
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 * 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.
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 * 4. The names "Ant" and "Apache Software
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 * 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.taskdefs;

import java.util.Vector;
import org.apache.tools.ant.BuildException;
import org.apache.tools.ant.Task;
import org.apache.tools.ant.input.InputRequest;
import org.apache.tools.ant.input.MultipleChoiceInputRequest;
import org.apache.tools.ant.util.StringUtils;

/**
 * Reads an input line from the console.
 *
 * @author <a href="mailto:usch@usch.net">Ulrich Schmidt</a>
 * @author <a href="mailto:stefan.bodewig@epost.de">Stefan Bodewig</a>
 *
 * @since Ant 1.5
 *
 * @ant.task category="control"
 */
public class Input extends Task {
    private String validargs = null;
    private String message = "";
    private String addproperty = null;
    private String defaultvalue = null;

    /**
     * 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 overriden.
     *
     * @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;
    }

    /**
     * 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.
     */
    public void addText(String msg) {
        message += getProject().replaceProperties(msg);
    }

    /**
     * No arg constructor.
     */
    public Input () {
    }

    /**
     * Actual method executed by jakarta-ant.
     * @exception BuildException
     */
    public void execute () throws BuildException {
        InputRequest request = null;
        if (validargs != null) {
            Vector accept = StringUtils.split(validargs, ',');
            request = new MultipleChoiceInputRequest(message, accept);
        } else {
            request = new InputRequest(message);
        }

        getProject().getInputHandler().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);
        }
    }

}