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Groovy example source code file (AliasCommand.groovy)

This example Groovy source code file (AliasCommand.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

aliascommand, aliastargetproxycommand, aliastargetproxycommand, can, command, commandsupport, list, list, object, object, shell, string, string, todo

The Groovy AliasCommand.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

/**
 * The 'alias' command.
 *
 * @version $Id: AliasCommand.groovy 17536 2009-09-04 01:42:05Z glaforge $
 * @author <a href="mailto:jason@planet57.com">Jason Dillon
 */
class AliasCommand
    extends CommandSupport
{
    AliasCommand(final Shell shell) {
        super(shell, 'alias', '\\a')
    }

    Object execute(final List args) {
        assert args != null
        
        if (args.size() < 2) {
            fail("Command 'alias' requires at least 2 arguments") // TODO: i18n
        }
        
        String name = args[0]
        List target = args[1..-1]
        
        def command = registry[name]
        
        if (command) {
            if (command instanceof AliasTargetProxyCommand) {
                log.debug("Rebinding alias: $name")
                
                registry.remove(command)
            }
            else {
                fail("Can not rebind non-user aliased command: ${command.name}") // TODO: i18n
            }
        }
        
        log.debug("Creating alias '$name' to: $target")
        
        // Register the command
        command = shell << new AliasTargetProxyCommand(shell, name, target)
        
        //
        // TODO: Should this be here... or should this be in the Shell's impl?
        //
        
        // Try to install the completor
        if (shell.runner) {
            shell.runner.completor << command
        }
    }
}

class AliasTargetProxyCommand
    extends CommandSupport
{
    private static int counter = 0
    
    final List args
    
    AliasTargetProxyCommand(final Shell shell, final String name, final List args) {
        super(shell, name, '\\a' + counter++)
        
        assert args
        
        this.args = args
    }
    
    String getDescription() {
        return "User defined alias to: @|bold ${args.join(' ')}|@"
    }

    String getUsage() {
        return ''
    }
    
    String getHelp() {
        return description
    }
    
    Object execute(List args) {
        args = this.args + args
        
        log.debug("Executing with args: $args")
        
        //
        // FIXME: Should go back through shell.execute() to allow aliases to groovy snips too
        //
        
        return shell.executeCommand(args.join(' '))
    }
}

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