001 /*
002 * Copyright (C) 2012 eXo Platform SAS.
003 *
004 * This is free software; you can redistribute it and/or modify it
005 * under the terms of the GNU Lesser General Public License as
006 * published by the Free Software Foundation; either version 2.1 of
007 * the License, or (at your option) any later version.
008 *
009 * This software is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * You should have received a copy of the GNU Lesser General Public
015 * License along with this software; if not, write to the Free
016 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
017 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
018 */
019 package org.crsh.lang.impl.groovy.command;
020
021 import groovy.lang.MissingMethodException;
022 import groovy.lang.MissingPropertyException;
023 import groovy.lang.Script;
024 import org.crsh.lang.impl.groovy.Helper;
025 import org.crsh.shell.impl.command.spi.CommandException;
026 import org.crsh.shell.impl.command.spi.CommandInvoker;
027 import org.crsh.command.InvocationContext;
028 import org.crsh.lang.impl.groovy.closure.PipeLineClosure;
029 import org.crsh.text.RenderPrintWriter;
030
031 import java.lang.reflect.UndeclaredThrowableException;
032 import java.util.LinkedList;
033
034 public abstract class GroovyScriptCommand extends Script {
035
036 /** . */
037 private LinkedList<InvocationContext<?>> stack;
038
039 /** The current context. */
040 protected InvocationContext context;
041
042 /** The current output. */
043 protected RenderPrintWriter out;
044
045 protected GroovyScriptCommand() {
046 this.stack = null;
047 }
048
049 public final void pushContext(InvocationContext<?> context) throws NullPointerException {
050 if (context == null) {
051 throw new NullPointerException();
052 }
053
054 //
055 if (stack == null) {
056 stack = new LinkedList<InvocationContext<?>>();
057 }
058
059 // Save current context (is null the first time)
060 stack.addLast(this.context);
061
062 // Set new context
063 this.context = context;
064 this.out = context.getWriter();
065 }
066
067 public final InvocationContext<?> popContext() {
068 if (stack == null || stack.isEmpty()) {
069 throw new IllegalStateException("Cannot pop a context anymore from the stack");
070 }
071 InvocationContext context = this.context;
072 this.context = stack.removeLast();
073 this.out = this.context != null ? this.context.getWriter() : null;
074 return context;
075 }
076
077 public final void execute(String s) throws Exception {
078 InvocationContext<?> context = peekContext();
079 try {
080 CommandInvoker invoker = context.resolve(s);
081 invoker.invoke(context);
082 }
083 catch (CommandException e) {
084 Throwable cause = e.getCause();
085 if (cause instanceof Exception) {
086 throw (Exception)cause;
087 } else if (cause instanceof Error) {
088 throw (Error)cause;
089 } else {
090 throw new UndeclaredThrowableException(cause);
091 }
092 }
093 }
094
095 public final InvocationContext<?> peekContext() {
096 return (InvocationContext<?>)context;
097 }
098
099 @Override
100 public final Object invokeMethod(String name, Object args) {
101
102 //
103 try {
104 return super.invokeMethod(name, args);
105 }
106 catch (MissingMethodException missing) {
107 return Helper.invokeMethod(context, name, args, missing);
108 }
109 }
110
111 @Override
112 public final Object getProperty(String property) {
113 if ("out".equals(property)) {
114 return ((InvocationContext<?>)context).getWriter();
115 } else if ("context".equals(property)) {
116 return context;
117 } else {
118 PipeLineClosure ret = Helper.resolveProperty(context, property);
119 if (ret != null) {
120 return ret;
121 }
122 try {
123 return super.getProperty(property);
124 }
125 catch (MissingPropertyException e) {
126 return null;
127 }
128 }
129 }
130 }