org.nanocontainer.script.groovy.OldGroovyNodeBuilder Maven / Gradle / Ivy
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/*****************************************************************************
* Copyright (C) NanoContainer Organization. All rights reserved. *
* ------------------------------------------------------------------------- *
* The software in this package is published under the terms of the BSD *
* style license a copy of which has been included with this distribution in *
* the LICENSE.txt file. *
* *
* Original code by James Strachan *
*****************************************************************************/
package org.nanocontainer.script.groovy;
import groovy.lang.Closure;
import groovy.lang.GroovyObject;
import groovy.util.BuilderSupport;
import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.security.AccessController;
import java.security.Permission;
import java.security.PrivilegedAction;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.codehaus.groovy.runtime.InvokerHelper;
import org.nanocontainer.ClassNameKey;
import org.nanocontainer.ClassPathElement;
import org.nanocontainer.DefaultNanoContainer;
import org.nanocontainer.NanoContainer;
import org.nanocontainer.script.NanoContainerMarkupException;
import org.nanocontainer.script.NodeBuilderDecorationDelegate;
import org.nanocontainer.script.NullNodeBuilderDecorationDelegate;
import org.picocontainer.ComponentMonitor;
import org.picocontainer.MutablePicoContainer;
import org.picocontainer.Parameter;
import org.picocontainer.PicoContainer;
import org.picocontainer.ComponentAdapter;
import org.picocontainer.defaults.ComponentAdapterFactory;
import org.picocontainer.defaults.ComponentMonitorStrategy;
import org.picocontainer.defaults.ConstantParameter;
import org.picocontainer.defaults.DefaultComponentAdapterFactory;
import org.picocontainer.defaults.DefaultPicoContainer;
import org.picocontainer.defaults.DelegatingComponentMonitor;
/**
*
* Builds node trees of PicoContainers and Pico components using GroovyMarkup.
*
* Simple example usage in your groovy script:
*
* builder = new org.nanocontainer.script.groovy.OldGroovyNodeBuilder()
* pico = builder.container(parent:parent) {
* component(class:org.nanocontainer.testmodel.DefaultWebServerConfig)
* component(class:org.nanocontainer.testmodel.WebServerImpl)
* }
*
* @author James Strachan
* @author Paul Hammant
* @author Aslak Hellesøy
* @author Michael Rimov
* @author Mauro Talevi
* @version $Revision: 3144 $
* @deprecated Since version 1.0-RC-3, use GroovyNodeBuilder instead.
*/
public class OldGroovyNodeBuilder extends BuilderSupport {
private static final String NEW_BUILDER = "newBuilder";
private static final String CONTAINER = "container";
private static final String COMPONENT = "component";
private static final String INSTANCE = "instance";
private static final String KEY = "key";
private static final String PARAMETERS = "parameters";
private static final String BEAN = "bean";
private static final String BEAN_CLASS = "beanClass";
private static final String CLASS = "class";
private static final String CLASS_NAME_KEY = "classNameKey";
private static final String CLASSPATH_ELEMENT = "classPathElement";
private static final String CLASSLOADER = "classLoader";
private static final String PATH = "path";
private static final String GRANT = "grant";
private static final String HTTP = "http://";
private static final String PARENT = "parent";
private static final String COMPONENT_ADAPTER_FACTORY = "componentAdapterFactory";
private static final String COMPONENT_MONITOR = "componentMonitor";
private static final String EMPTY = "";
private static final String DO_CALL = "doCall";
private final NodeBuilderDecorationDelegate decorationDelegate;
public OldGroovyNodeBuilder(NodeBuilderDecorationDelegate decorationDelegate) {
this.decorationDelegate = decorationDelegate;
}
public OldGroovyNodeBuilder() {
this(new NullNodeBuilderDecorationDelegate());
}
protected void setParent(Object parent, Object child) {
}
protected Object doInvokeMethod(String s, Object name, Object args) {
//TODO use setClosureDelegate() from Groovy JSR
Object answer = super.doInvokeMethod(s, name, args);
List list = InvokerHelper.asList(args);
if (!list.isEmpty()) {
Object o = list.get(list.size() - 1);
if (o instanceof Closure) {
Closure closure = (Closure) o;
closure.setDelegate(answer);
}
}
return answer;
}
protected void setClosureDelegate(Closure closure, Object o) {
super.setClosureDelegate(closure, o);
}
protected Object createNode(Object name) {
return createNode(name, Collections.EMPTY_MAP);
}
protected Object createNode(Object name, Object value) {
Map attributes = new HashMap();
attributes.put(CLASS, value);
return createNode(name, attributes);
}
/**
* Override of create node. Called by BuilderSupport. It examines the
* current state of the builder and the given parameters and dispatches the
* code to one of the create private functions in this object.
* @param name The name of the groovy node we're building. Examples are
* 'container', and 'grant',
* @param attributes Map attributes of the current invocation.
* @return Object the created object.
*/
protected Object createNode(Object name, Map attributes, Object value) {
Object current = getCurrent();
if (current != null && current instanceof GroovyObject) {
return createChildBuilder(current, name, attributes);
} else if (current == null || current instanceof NanoContainer) {
NanoContainer parent = (NanoContainer) current;
Object parentAttribute = attributes.get(PARENT);
if (parent != null && parentAttribute != null) {
throw new NanoContainerMarkupException("You can't explicitly specify a parent in a child element.");
}
if (parent == null && (parentAttribute instanceof MutablePicoContainer)) {
// we're not in an enclosing scope - look at parent attribute instead
parent = new DefaultNanoContainer((MutablePicoContainer) parentAttribute);
}
if (parent == null && (parentAttribute instanceof NanoContainer)) {
// we're not in an enclosing scope - look at parent attribute instead
parent = (NanoContainer) parentAttribute;
}
if (name.equals(CONTAINER)) {
return createChildContainer(attributes, parent);
} else {
try {
return createChildOfContainerNode(parent, name, attributes, current);
} catch (ClassNotFoundException e) {
throw new NanoContainerMarkupException("ClassNotFoundException: " + e.getMessage(), e);
}
}
} else if (current instanceof ClassPathElement) {
if (name.equals(GRANT)) {
return createGrantPermission(attributes, (ClassPathElement) current);
}
return EMPTY;
} else if (current instanceof ComponentAdapter && name.equals("instance")) {
// TODO - Michael.
// Michael, we could implement key() implementation() and possibly (with many limits on use) instance() here.
// Not what you outline in NANO-138 as is though.
return decorationDelegate.createNode(name, attributes, current);
} else {
// we don't know how to handle it - delegate to the decorator.
return decorationDelegate.createNode(name, attributes, current);
}
}
private Object createChildBuilder(Object current, Object name, Map attributes) {
GroovyObject groovyObject = (GroovyObject) current;
return groovyObject.invokeMethod(name.toString(), attributes);
}
private Object createGrantPermission(Map attributes, ClassPathElement cpe) {
Permission perm = (Permission) attributes.remove(CLASS);
return cpe.grantPermission(perm);
}
private Object createChildOfContainerNode(NanoContainer parentContainer, Object name, Map attributes, Object current) throws ClassNotFoundException {
if (name.equals(COMPONENT)) {
decorationDelegate.rememberComponentKey(attributes);
return createComponentNode(attributes, parentContainer, name);
} else if (name.equals(BEAN)) {
return createBeanNode(attributes, parentContainer.getPico());
} else if (name.equals(CLASSPATH_ELEMENT)) {
return createClassPathElementNode(attributes, parentContainer);
} else if (name.equals(DO_CALL)) {
// TODO does this node need to be handled?
return null;
} else if (name.equals(NEW_BUILDER)) {
return createNewBuilderNode(attributes, parentContainer);
} else if (name.equals(CLASSLOADER)) {
return createComponentClassLoader(parentContainer);
} else {
// we don't know how to handle it - delegate to the decorator.
return decorationDelegate.createNode(name, attributes, current);
}
}
private Object createNewBuilderNode(Map attributes, NanoContainer parentContainer) {
String builderClass = (String) attributes.remove(CLASS);
NanoContainer factory = new DefaultNanoContainer();
MutablePicoContainer parentPico = parentContainer.getPico();
factory.getPico().registerComponentInstance(MutablePicoContainer.class, parentPico);
try {
factory.registerComponentImplementation(GroovyObject.class, builderClass);
} catch (ClassNotFoundException e) {
throw new NanoContainerMarkupException("ClassNotFoundException " + builderClass);
}
Object componentInstance = factory.getPico().getComponentInstance(GroovyObject.class);
return componentInstance;
}
private ClassPathElement createClassPathElementNode(Map attributes, NanoContainer nanoContainer) {
final String path = (String) attributes.remove(PATH);
URL pathURL = null;
try {
if (path.toLowerCase().startsWith(HTTP)) {
pathURL = new URL(path);
} else {
Object rVal = AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
try {
File file = new File(path);
if (!file.exists()) {
return new NanoContainerMarkupException("classpath '" + path + "' does not exist ");
}
return file.toURL();
} catch (MalformedURLException e) {
return e;
}
}
});
if (rVal instanceof MalformedURLException) {
throw (MalformedURLException) rVal;
}
if (rVal instanceof NanoContainerMarkupException) {
throw (NanoContainerMarkupException) rVal;
}
pathURL = (URL) rVal;
}
} catch (MalformedURLException e) {
throw new NanoContainerMarkupException("classpath '" + path + "' malformed ", e);
}
return nanoContainer.addClassLoaderURL(pathURL);
}
private Object createBeanNode(Map attributes, MutablePicoContainer pico) {
Object bean = createBean(attributes);
pico.registerComponentInstance(bean);
return bean;
}
private Object createComponentNode(Map attributes, NanoContainer nano, Object name) throws ClassNotFoundException {
Object key = attributes.remove(KEY);
Object cnkey = attributes.remove(CLASS_NAME_KEY);
Object classValue = attributes.remove(CLASS);
Object instance = attributes.remove(INSTANCE);
Object retval = null;
List parameters = (List) attributes.remove(PARAMETERS);
MutablePicoContainer pico = nano.getPico();
if (cnkey != null) {
key = new ClassNameKey((String)cnkey);
}
Parameter[] parameterArray = getParameters(parameters);
if (classValue instanceof Class) {
Class clazz = (Class) classValue;
key = key == null ? clazz : key;
retval = pico.registerComponentImplementation(key, clazz, parameterArray);
} else if (classValue instanceof String) {
String className = (String) classValue;
key = key == null ? className : key;
retval = nano.registerComponentImplementation(key, className, parameterArray);
} else if (instance != null) {
key = key == null ? instance.getClass() : key;
retval = pico.registerComponentInstance(key, instance);
} else {
throw new NanoContainerMarkupException("Must specify a class attribute for a component as a class name (string) or Class. Attributes:" + attributes);
}
return retval;
}
protected Object createNode(Object name, Map attributes) {
return createNode(name, attributes, null);
}
/**
* Creates a new container. There may or may not be a parent to this container.
* Supported attributes are:
*
* - componentAdapterFactory: The ComponentAdapterFactory used for new container
* - componentMonitor: The ComponentMonitor used for new container
*
* @param attributes Map Attributes defined by the builder in the script.
* @param parent The parent container
* @return The NanoContainer
*/
protected NanoContainer createChildContainer(Map attributes, NanoContainer parent) {
ClassLoader parentClassLoader = null;
MutablePicoContainer childContainer = null;
if (parent != null) {
parentClassLoader = parent.getComponentClassLoader();
if ( isAttribute(attributes, COMPONENT_ADAPTER_FACTORY) ) {
ComponentAdapterFactory componentAdapterFactory = createComponentAdapterFactory(attributes);
childContainer = new DefaultPicoContainer(
decorationDelegate.decorate(componentAdapterFactory, attributes), parent.getPico());
if ( isAttribute(attributes, COMPONENT_MONITOR) ) {
changeComponentMonitor(childContainer, createComponentMonitor(attributes));
}
parent.getPico().addChildContainer(childContainer);
} else if ( isAttribute(attributes, COMPONENT_MONITOR) ) {
ComponentAdapterFactory componentAdapterFactory = new DefaultComponentAdapterFactory(
createComponentMonitor(attributes));
childContainer = new DefaultPicoContainer(
decorationDelegate.decorate(componentAdapterFactory, attributes), parent.getPico());
} else {
childContainer = parent.getPico().makeChildContainer();
}
} else {
parentClassLoader = (ClassLoader) AccessController.doPrivileged(new PrivilegedAction() {
public Object run() {
return PicoContainer.class.getClassLoader();
}
});
ComponentAdapterFactory componentAdapterFactory = createComponentAdapterFactory(attributes);
childContainer = new DefaultPicoContainer(
decorationDelegate.decorate(componentAdapterFactory, attributes));
if ( isAttribute(attributes, COMPONENT_MONITOR) ) {
changeComponentMonitor(childContainer, createComponentMonitor(attributes));
}
}
MutablePicoContainer decoratedPico = decorationDelegate.decorate(childContainer);
if ( isAttribute(attributes, CLASS) ) {
Class clazz = (Class) attributes.get(CLASS);
return createNanoContainer(clazz, decoratedPico, parentClassLoader);
} else {
return new DefaultNanoContainer(parentClassLoader, decoratedPico);
}
}
private void changeComponentMonitor(MutablePicoContainer childContainer, ComponentMonitor monitor) {
if ( childContainer instanceof ComponentMonitorStrategy ){
((ComponentMonitorStrategy)childContainer).changeMonitor(monitor);
}
}
private NanoContainer createNanoContainer(Class clazz, MutablePicoContainer decoratedPico, ClassLoader parentClassLoader) {
DefaultPicoContainer instantiatingContainer = new DefaultPicoContainer();
instantiatingContainer.registerComponentInstance(ClassLoader.class, parentClassLoader);
instantiatingContainer.registerComponentInstance(MutablePicoContainer.class, decoratedPico);
instantiatingContainer.registerComponentImplementation(NanoContainer.class, clazz);
Object componentInstance = instantiatingContainer.getComponentInstance(NanoContainer.class);
return (NanoContainer) componentInstance;
}
private boolean isAttribute(Map attributes, String key) {
return attributes.containsKey(key) && attributes.get(key) != null;
}
private ComponentAdapterFactory createComponentAdapterFactory(Map attributes) {
final ComponentAdapterFactory factory = (ComponentAdapterFactory) attributes.remove(COMPONENT_ADAPTER_FACTORY);
if ( factory == null ){
return new DefaultComponentAdapterFactory();
}
return factory;
}
private ComponentMonitor createComponentMonitor(Map attributes) {
final ComponentMonitor monitor = (ComponentMonitor) attributes.remove(COMPONENT_MONITOR);
if ( monitor == null ){
return new DelegatingComponentMonitor();
}
return monitor;
}
protected NanoContainer createComponentClassLoader(NanoContainer parent) {
return new DefaultNanoContainer(parent.getComponentClassLoader(), parent.getPico());
}
protected Object createBean(Map attributes) {
Class type = (Class) attributes.remove(BEAN_CLASS);
if (type == null) {
throw new NanoContainerMarkupException("Bean must have a beanClass attribute");
}
try {
Object bean = type.newInstance();
// now let's set the properties on the bean
for (Iterator iter = attributes.entrySet().iterator(); iter.hasNext();) {
Map.Entry entry = (Map.Entry) iter.next();
String name = entry.getKey().toString();
Object value = entry.getValue();
InvokerHelper.setProperty(bean, name, value);
}
return bean;
} catch (IllegalAccessException e) {
throw new NanoContainerMarkupException("Failed to create bean of type '" + type + "'. Reason: " + e, e);
} catch (InstantiationException e) {
throw new NanoContainerMarkupException("Failed to create bean of type " + type + "'. Reason: " + e, e);
}
}
private Parameter[] getParameters(List paramsList) {
if (paramsList == null) {
return null;
}
int n = paramsList.size();
Parameter[] parameters = new Parameter[n];
for (int i = 0; i < n; ++i) {
parameters[i] = toParameter(paramsList.get(i));
}
return parameters;
}
private Parameter toParameter(Object obj) {
return obj instanceof Parameter ? (Parameter) obj : new ConstantParameter(obj);
}
}
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