001    package org.crsh.shell.impl.command;
002    
003    import groovy.lang.Script;
004    import org.crsh.command.GroovyScriptCommand;
005    import org.crsh.command.NoSuchCommandException;
006    import org.crsh.command.ShellCommand;
007    import org.crsh.plugin.PluginContext;
008    import org.crsh.plugin.ResourceKind;
009    
010    import java.security.Principal;
011    
012    /** @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a> */
013    public class CRaSH {
014    
015    
016      /** . */
017      final ClassManager<ShellCommand> commands;
018    
019      /** . */
020      final ClassManager<Script> lifecycles;
021    
022      /** . */
023      final PluginContext context;
024    
025      public CRaSH(PluginContext context) {
026        this.context = context;
027        this.commands = new ClassManager<ShellCommand>(context, ResourceKind.COMMAND, ShellCommand.class, GroovyScriptCommand.class);
028        this.lifecycles = new ClassManager<Script>(context, ResourceKind.LIFECYCLE, Script.class, Script.class);
029      }
030    
031      public CRaSHSession createSession(Principal user) {
032        return new CRaSHSession(this, user);
033      }
034    
035      /**
036       * Returns the plugin context.
037       *
038       * @return the plugin context
039       */
040      public PluginContext getContext() {
041        return context;
042      }
043    
044      /**
045       * Attempt to obtain a command instance. Null is returned when such command does not exist.
046       *
047       * @param name the command name
048       * @return a command instance
049       * @throws org.crsh.command.NoSuchCommandException if an error occured preventing the command creation
050       * @throws NullPointerException if the name argument is null
051       */
052      public ShellCommand getCommand(String name) throws NoSuchCommandException, NullPointerException {
053        return commands.getInstance(name);
054      }
055    }