Groovy example source code file (SetCommand.groovy)

This example Groovy source code file (SetCommand.groovy) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Groovy tags/keywords

command, commandsupport, commandsupport, list, list, object, object, setcommand, setcommand, setting, shell, simplecompletor

The Groovy SetCommand.groovy source code

/*
 * Copyright 2003-2007 the original author or authors.
 *
 * Licensed 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.codehaus.groovy.tools.shell.commands

import org.codehaus.groovy.tools.shell.CommandSupport
import org.codehaus.groovy.tools.shell.Shell

import org.codehaus.groovy.tools.shell.util.SimpleCompletor
import org.codehaus.groovy.tools.shell.util.Preferences

/**
 * The 'set' command, used to set preferences.
 *
 * @version $Id: SetCommand.groovy 8407 2007-10-07 01:46:36Z user57 $
 * @author <a href="mailto:jason@planet57.com">Jason Dillon
 */
class SetCommand
    extends CommandSupport
{
    SetCommand(final Shell shell) {
        super(shell, 'set', '\\=')
    }

    protected List createCompletors() {
        def loader = {
            def list = []

            def keys = Preferences.keys()

            keys.each { list << it }

            return list
        }

        return [
            new SimpleCompletor(loader),
            null
        ]
    }

    Object execute(final List args) {
        assert args != null
        
        if (args.size() == 0) {
            def keys = Preferences.keys()
            
            if (keys.size() == 0) {
                io.out.println('No preferences are set')
                return
            }
            else {
                io.out.println('Preferences:')
                keys.each {
                    def value = Preferences.get(it, null)
                    println("    $it=$value")
                }
            }
            return
        }
        
        if (args.size() > 2) {
            fail("Command '$name' requires arguments: <name> []")
        }
        
        def name = args[0]
        def value
        
        if (args.size() == 1) {
            value = true
        }
        else {
            value = args[1]
        }
        
        log.debug("Setting preference: $name=$value")
        
        Preferences.put(name, String.valueOf(value))
    }
}