org.codehaus.groovy.tools.shell.util.XmlCommandRegistrar.groovy Maven / Gradle / Ivy

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/*
 * 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.util

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

/**
 * Registers {@link Command} classes from an XML file like:
 *
 *   {@literal
 
   
   org.codehaus.groovy.tools.shell.commands.HelpCommand
   org.codehaus.groovy.tools.shell.commands.ExitCommand
   org.codehaus.groovy.tools.shell.commands.ImportCommand
   org.codehaus.groovy.tools.shell.commands.DisplayCommand
   org.codehaus.groovy.tools.shell.commands.ClearCommand
   org.codehaus.groovy.tools.shell.commands.ShowCommand
   org.codehaus.groovy.tools.shell.commands.InspectCommand
   org.codehaus.groovy.tools.shell.commands.PurgeCommand
   org.codehaus.groovy.tools.shell.commands.EditCommand
   org.codehaus.groovy.tools.shell.commands.LoadCommand
   org.codehaus.groovy.tools.shell.commands.SaveCommand
   org.codehaus.groovy.tools.shell.commands.RecordCommand
   org.codehaus.groovy.tools.shell.commands.HistoryCommand
   org.codehaus.groovy.tools.shell.commands.AliasCommand
   org.codehaus.groovy.tools.shell.commands.SetCommand
   org.codehaus.groovy.tools.shell.commands.ShadowCommand
   org.codehaus.groovy.tools.shell.commands.RegisterCommand
   org.codehaus.groovy.tools.shell.commands.DocCommand
   
 
 * }
 *  *
 * @version $Id$
 * @author Jason Dillon
 */
class XmlCommandRegistrar
{
    private final Logger log = Logger.create(this.class)

    private final Shell shell

    private final ClassLoader classLoader

    XmlCommandRegistrar(final Shell shell, final ClassLoader classLoader) {
        assert shell != null
        assert classLoader != null

        this.shell = shell
        this.classLoader = classLoader
    }

    void register(final URL url) {
        assert url

        if (log.debugEnabled) {
            log.debug("Registering commands from: $url")
        }

        url.withReader {Reader reader ->
            groovy.util.Node doc = new groovy.util.XmlParser().parse(reader)

            doc.children().each {groovy.util.Node element ->
                String classname = element.text()

                Class type = classLoader.loadClass(classname)

                Command command = type.newInstance(shell) as Command

                if (log.debugEnabled) {
                    log.debug("Created command '${command.name}': $command")
                }

                shell << command
            }
        }
    }
}