| /* |
| * 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 groovy.lang; |
| |
| import org.codehaus.groovy.ast.expr.ArgumentListExpression; |
| import org.codehaus.groovy.control.CompilationFailedException; |
| import org.codehaus.groovy.runtime.DefaultGroovyMethods; |
| import org.codehaus.groovy.runtime.InvokerHelper; |
| |
| import java.io.File; |
| import java.io.IOException; |
| |
| /** |
| * This object represents a Groovy script |
| * |
| * @author <a href="mailto:james@coredevelopers.net">James Strachan</a> |
| * @author Guillaume Laforge |
| * @version $Revision$ |
| */ |
| public abstract class Script extends GroovyObjectSupport { |
| private Binding binding; |
| |
| protected Script() { |
| this(new Binding()); |
| } |
| |
| protected Script(Binding binding) { |
| this.binding = binding; |
| } |
| |
| public Binding getBinding() { |
| return binding; |
| } |
| |
| public void setBinding(Binding binding) { |
| this.binding = binding; |
| } |
| |
| public Object getProperty(String property) { |
| try { |
| return binding.getVariable(property); |
| } catch (MissingPropertyException e) { |
| return super.getProperty(property); |
| } |
| } |
| |
| public void setProperty(String property, Object newValue) { |
| if ("binding".equals(property)) |
| setBinding((Binding) newValue); |
| else if("metaClass".equals(property)) |
| setMetaClass((MetaClass)newValue); |
| else |
| binding.setVariable(property, newValue); |
| } |
| |
| /** |
| * Invoke a method (or closure in the binding) defined. |
| * |
| * @param name method to call |
| * @param args arguments to pass to the method |
| * @return value |
| */ |
| public Object invokeMethod(String name, Object args) { |
| try { |
| return super.invokeMethod(name, args); |
| } |
| // if the method was not found in the current scope (the script's methods) |
| // let's try to see if there's a method closure with the same name in the binding |
| catch (MissingMethodException mme) { |
| try { |
| if (name.equals(mme.getMethod())) { |
| Object boundClosure = binding.getVariable(name); |
| if (boundClosure != null && boundClosure instanceof Closure) { |
| return ((Closure) boundClosure).call((Object[])args); |
| } else { |
| throw mme; |
| } |
| } else { |
| throw mme; |
| } |
| } catch (MissingPropertyException mpe) { |
| throw mme; |
| } |
| } |
| } |
| |
| /** |
| * The main instance method of a script which has variables in scope |
| * as defined by the current {@link Binding} instance. |
| */ |
| public abstract Object run(); |
| |
| // println helper methods |
| |
| /** |
| * Prints a newline to the current 'out' variable which should be a PrintWriter |
| * or at least have a println() method defined on it. |
| * If there is no 'out' property then print to standard out. |
| */ |
| public void println() { |
| Object object; |
| |
| try { |
| object = getProperty("out"); |
| } catch (MissingPropertyException e) { |
| System.out.println(); |
| return; |
| } |
| |
| InvokerHelper.invokeMethod(object, "println", ArgumentListExpression.EMPTY_ARRAY); |
| } |
| |
| /** |
| * Prints the value to the current 'out' variable which should be a PrintWriter |
| * or at least have a print() method defined on it. |
| * If there is no 'out' property then print to standard out. |
| */ |
| public void print(Object value) { |
| Object object; |
| |
| try { |
| object = getProperty("out"); |
| } catch (MissingPropertyException e) { |
| DefaultGroovyMethods.print(System.out,value); |
| return; |
| } |
| |
| InvokerHelper.invokeMethod(object, "print", new Object[]{value}); |
| } |
| |
| /** |
| * Prints the value and a newline to the current 'out' variable which should be a PrintWriter |
| * or at least have a println() method defined on it. |
| * If there is no 'out' property then print to standard out. |
| */ |
| public void println(Object value) { |
| Object object; |
| |
| try { |
| object = getProperty("out"); |
| } catch (MissingPropertyException e) { |
| DefaultGroovyMethods.println(System.out,value); |
| return; |
| } |
| |
| InvokerHelper.invokeMethod(object, "println", new Object[]{value}); |
| } |
| |
| /** |
| * A helper method to allow the dynamic evaluation of groovy expressions using this |
| * scripts binding as the variable scope |
| * |
| * @param expression is the Groovy script expression to evaluate |
| */ |
| public Object evaluate(String expression) throws CompilationFailedException, IOException { |
| GroovyShell shell = new GroovyShell(binding); |
| return shell.evaluate(expression); |
| } |
| |
| /** |
| * A helper method to allow the dynamic evaluation of groovy expressions using this |
| * scripts binding as the variable scope |
| * |
| * @param file is the Groovy script to evaluate |
| */ |
| public Object evaluate(File file) throws CompilationFailedException, IOException { |
| GroovyShell shell = new GroovyShell(binding); |
| return shell.evaluate(file); |
| } |
| |
| /** |
| * A helper method to allow scripts to be run taking command line arguments |
| */ |
| public void run(File file, String[] arguments) throws CompilationFailedException, IOException { |
| GroovyShell shell = new GroovyShell(binding); |
| shell.run(file, arguments); |
| } |
| } |