Examples with DelegatingMetaClass groovy.lang.DelegatingMetaClass used on opensource projects

Example 1 with DelegatingMetaClass

use of groovy.lang.DelegatingMetaClass in project groovy by apache.

the class GroovyScriptEngineImpl method eval.

// package-privates
Object eval(Class<?> scriptClass, final ScriptContext ctx) throws ScriptException {
    /*
         * We use the following Binding instance so that global variable lookup
         * will be done in the current ScriptContext instance.
         */
    Binding binding = new Binding(ctx.getBindings(ScriptContext.ENGINE_SCOPE)) {

        @Override
        public Object getVariable(String name) {
            synchronized (ctx) {
                int scope = ctx.getAttributesScope(name);
                if (scope != -1) {
                    return ctx.getAttribute(name, scope);
                }
                // Redirect script output to context writer, if out var is not already provided
                if ("out".equals(name)) {
                    Writer writer = ctx.getWriter();
                    if (writer != null) {
                        return (writer instanceof PrintWriter) ? (PrintWriter) writer : new PrintWriter(writer, true);
                    }
                }
                // Provide access to engine context, if context var is not already provided
                if ("context".equals(name)) {
                    return ctx;
                }
            }
            throw new MissingPropertyException(name, getClass());
        }

        @Override
        public void setVariable(String name, Object value) {
            synchronized (ctx) {
                int scope = ctx.getAttributesScope(name);
                if (scope == -1) {
                    scope = ScriptContext.ENGINE_SCOPE;
                }
                ctx.setAttribute(name, value, scope);
            }
        }
    };
    try {
        // then simply return that class
        if (!Script.class.isAssignableFrom(scriptClass)) {
            return scriptClass;
        } else {
            // it's a script
            Script scriptObject = InvokerHelper.createScript(scriptClass, binding);
            // save all current closures into global closures map
            Method[] methods = scriptClass.getMethods();
            for (Method m : methods) {
                String name = m.getName();
                globalClosures.put(name, new MethodClosure(scriptObject, name));
            }
            MetaClass oldMetaClass = scriptObject.getMetaClass();
            /*
                * We override the MetaClass of this script object so that we can
                * forward calls to global closures (of previous or future "eval" calls)
                * This gives the illusion of working on the same "global" scope.
                */
            scriptObject.setMetaClass(new DelegatingMetaClass(oldMetaClass) {

                @Override
                public Object invokeMethod(Object object, String name, Object args) {
                    if (args == null) {
                        return invokeMethod(object, name, MetaClassHelper.EMPTY_ARRAY);
                    }
                    if (args instanceof Tuple) {
                        return invokeMethod(object, name, ((Tuple) args).toArray());
                    }
                    if (args instanceof Object[]) {
                        return invokeMethod(object, name, (Object[]) args);
                    } else {
                        return invokeMethod(object, name, new Object[] { args });
                    }
                }

                @Override
                public Object invokeMethod(Object object, String name, Object[] args) {
                    try {
                        return super.invokeMethod(object, name, args);
                    } catch (MissingMethodException mme) {
                        return callGlobal(name, args, ctx);
                    }
                }

                @Override
                public Object invokeStaticMethod(Object object, String name, Object[] args) {
                    try {
                        return super.invokeStaticMethod(object, name, args);
                    } catch (MissingMethodException mme) {
                        return callGlobal(name, args, ctx);
                    }
                }
            });
            return scriptObject.run();
        }
    } catch (Exception e) {
        throw new ScriptException(e);
    }
}

Example 2 with DelegatingMetaClass

use of groovy.lang.DelegatingMetaClass in project groovy by apache.

the class GPathResult method setMetaClass.

/**
     * Replaces the MetaClass of this GPathResult.
     *
     * @param metaClass the new MetaClass
     */
@Override
public void setMetaClass(final MetaClass metaClass) {
    final MetaClass newMetaClass = new DelegatingMetaClass(metaClass) {

        @Override
        public Object getAttribute(final Object object, final String attribute) {
            return GPathResult.this.getProperty("@" + attribute);
        }

        @Override
        public void setAttribute(final Object object, final String attribute, final Object newValue) {
            GPathResult.this.setProperty("@" + attribute, newValue);
        }
    };
    super.setMetaClass(newMetaClass);
}

Example 3 with DelegatingMetaClass

use of groovy.lang.DelegatingMetaClass in project groovy by apache.

the class MixinInMetaClass method mixinClassesToMetaClass.

public static void mixinClassesToMetaClass(MetaClass self, List<Class> categoryClasses) {
    final Class selfClass = self.getTheClass();
    if (self instanceof HandleMetaClass) {
        self = (MetaClass) ((HandleMetaClass) self).replaceDelegate();
    }
    if (!(self instanceof ExpandoMetaClass)) {
        if (self instanceof DelegatingMetaClass && ((DelegatingMetaClass) self).getAdaptee() instanceof ExpandoMetaClass) {
            self = ((DelegatingMetaClass) self).getAdaptee();
        } else {
            throw new GroovyRuntimeException("Can't mixin methods to meta class: " + self);
        }
    }
    ExpandoMetaClass mc = (ExpandoMetaClass) self;
    List<MetaMethod> arr = new ArrayList<MetaMethod>();
    for (Class categoryClass : categoryClasses) {
        final CachedClass cachedCategoryClass = ReflectionCache.getCachedClass(categoryClass);
        final MixinInMetaClass mixin = new MixinInMetaClass(mc, cachedCategoryClass);
        final MetaClass metaClass = GroovySystem.getMetaClassRegistry().getMetaClass(categoryClass);
        final List<MetaProperty> propList = metaClass.getProperties();
        for (MetaProperty prop : propList) if (self.getMetaProperty(prop.getName()) == null) {
            mc.registerBeanProperty(prop.getName(), new MixinInstanceMetaProperty(prop, mixin));
        }
        for (MetaProperty prop : cachedCategoryClass.getFields()) if (self.getMetaProperty(prop.getName()) == null) {
            mc.registerBeanProperty(prop.getName(), new MixinInstanceMetaProperty(prop, mixin));
        }
        for (MetaMethod method : metaClass.getMethods()) {
            final int mod = method.getModifiers();
            if (!Modifier.isPublic(mod))
                continue;
            if (method instanceof CachedMethod && ((CachedMethod) method).getCachedMethod().isSynthetic())
                continue;
            if (Modifier.isStatic(mod)) {
                if (method instanceof CachedMethod)
                    staticMethod(self, arr, (CachedMethod) method);
            } else if (method.getDeclaringClass().getTheClass() != Object.class || method.getName().equals("toString")) {
                //                    if (self.pickMethod(method.getName(), method.getNativeParameterTypes()) == null) {
                final MixinInstanceMetaMethod metaMethod = new MixinInstanceMetaMethod(method, mixin);
                arr.add(metaMethod);
            //                    }
            }
        }
    }
    for (Object res : arr) {
        final MetaMethod metaMethod = (MetaMethod) res;
        if (metaMethod.getDeclaringClass().isAssignableFrom(selfClass))
            mc.registerInstanceMethod(metaMethod);
        else {
            mc.registerSubclassInstanceMethod(metaMethod);
        }
    }
}

Example 4 with DelegatingMetaClass

use of groovy.lang.DelegatingMetaClass in project groovy by apache.

the class Node method setMetaClass.

/**
     * Extension point for subclasses to override the metaclass. The default
     * one supports the property and @ attribute notations.
     *
     * @param metaClass the original metaclass
     * @param nodeClass the class whose metaclass we wish to override (this class or a subclass)
     */
protected static void setMetaClass(final MetaClass metaClass, Class nodeClass) {
    // TODO Is protected static a bit of a smell?
    // TODO perhaps set nodeClass to be Class<? extends Node>
    final MetaClass newMetaClass = new DelegatingMetaClass(metaClass) {

        @Override
        public Object getAttribute(final Object object, final String attribute) {
            Node n = (Node) object;
            return n.get("@" + attribute);
        }

        @Override
        public void setAttribute(final Object object, final String attribute, final Object newValue) {
            Node n = (Node) object;
            n.attributes().put(attribute, newValue);
        }

        @Override
        public Object getProperty(Object object, String property) {
            if (object instanceof Node) {
                Node n = (Node) object;
                return n.get(property);
            }
            return super.getProperty(object, property);
        }

        @Override
        public void setProperty(Object object, String property, Object newValue) {
            if (property.startsWith("@")) {
                setAttribute(object, property.substring(1), newValue);
                return;
            }
            delegate.setProperty(object, property, newValue);
        }
    };
    GroovySystem.getMetaClassRegistry().setMetaClass(nodeClass, newMetaClass);
}

Example 5 with DelegatingMetaClass

use of groovy.lang.DelegatingMetaClass in project groovy by apache.

the class NodeList method setMetaClass.

protected static void setMetaClass(final Class nodelistClass, final MetaClass metaClass) {
    final MetaClass newMetaClass = new DelegatingMetaClass(metaClass) {

        @Override
        public Object getAttribute(final Object object, final String attribute) {
            NodeList nl = (NodeList) object;
            Iterator it = nl.iterator();
            List result = new ArrayList();
            while (it.hasNext()) {
                Node node = (Node) it.next();
                result.add(node.attributes().get(attribute));
            }
            return result;
        }

        @Override
        public void setAttribute(final Object object, final String attribute, final Object newValue) {
            for (Object o : (NodeList) object) {
                Node node = (Node) o;
                node.attributes().put(attribute, newValue);
            }
        }

        @Override
        public Object getProperty(Object object, String property) {
            if (object instanceof NodeList) {
                NodeList nl = (NodeList) object;
                return nl.getAt(property);
            }
            return super.getProperty(object, property);
        }
    };
    GroovySystem.getMetaClassRegistry().setMetaClass(nodelistClass, newMetaClass);
}