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package picocontainer.defaults;
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import picocontainer.hierarchical.DuplicateComponentTypeRegistrationException;
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import picocontainer.hierarchical.AssignabilityRegistrationException;
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import picocontainer.hierarchical.NotConcreteRegistrationException;
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import picocontainer.hierarchical.WrongNumberOfConstructorsRegistrationException;
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import picocontainer.hierarchical.AmbiguousComponentResolutionException;
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import picocontainer.hierarchical.UnsatisfiedDependencyStartupException;
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import picocontainer.PicoContainer;
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import picocontainer.ComponentFactory;
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import picocontainer.PicoRegistrationException;
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import picocontainer.PicoInitializationException;
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import picocontainer.PicoInvocationTargetInitailizationException;
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import java.util.Set;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Arrays;
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import java.util.Map;
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import java.util.HashMap;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.Iterator;
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import java.util.LinkedList;
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import java.lang.reflect.Method;
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import java.lang.reflect.Proxy;
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import java.lang.reflect.InvocationHandler;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Modifier;
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public class DefaultPicoContainer implements PicoContainer {
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private final ComponentFactory componentFactory;
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private List registeredComponents = new ArrayList();
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private Map componentTypeToInstanceMap = new HashMap();
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protected List orderedComponents = new ArrayList();
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protected List unmanagedComponents = new ArrayList();
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private Map parametersForComponent = new HashMap();
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private boolean initialized;
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public static class Default extends DefaultPicoContainer {
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public Default() {
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super(new DefaultComponentFactory());
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}
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}
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public DefaultPicoContainer(ComponentFactory componentFactory) {
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if (componentFactory == null) {
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throw new NullPointerException("componentFactory cannot be null");
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}
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this.componentFactory = componentFactory;
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}
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public final Object[] getComponents() {
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Class[] componentTypes = getComponentTypes();
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Object[] components = new Object[componentTypes.length];
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for (int i = 0; i < componentTypes.length; i++) {
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Class componentType = componentTypes[i];
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components[i] = getComponent(componentType);
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}
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return components;
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}
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public Object getMultipleInheritanceProxy() {
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return getAggregateComponentProxy( true, true);
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}
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public Object getAggregateComponentProxy(boolean callInInstantiationOrder, boolean callUnmanagedComponents) {
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return Proxy.newProxyInstance(
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getClass().getClassLoader(),
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getComponentInterfaces(),
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new ComponentsInvocationHandler(callInInstantiationOrder, callUnmanagedComponents));
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}
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private class ComponentsInvocationHandler implements InvocationHandler {
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private boolean callInInstantiationOrder;
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private boolean callUnmanagedComponents;
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public ComponentsInvocationHandler(boolean callInInstantiationOrder, boolean callUnmanagedComponents) {
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this.callInInstantiationOrder = callInInstantiationOrder;
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this.callUnmanagedComponents = callUnmanagedComponents;
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}
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public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
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List orderedComponentsCopy = new ArrayList(orderedComponents);
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if( !callInInstantiationOrder ) {
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Collections.reverse(orderedComponentsCopy);
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}
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Object[] components = orderedComponentsCopy.toArray();
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return invokeOnComponents(components, method, args);
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}
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private Object invokeOnComponents(Object[] components, Method method, Object[] args) throws IllegalAccessException, InvocationTargetException {
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Object result = null;
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int invokeCount = 0;
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for (int i = 0; i < components.length; i++) {
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Class declarer = method.getDeclaringClass();
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boolean isValidType = declarer.isAssignableFrom(components[i].getClass());
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boolean isUnmanaged = unmanagedComponents.contains(components[i]);
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boolean exclude = !callUnmanagedComponents && isUnmanaged;
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if (isValidType && !exclude) {
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Object resultCandidate = method.invoke(components[i], args);
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invokeCount++;
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if( invokeCount == 1 ) {
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result = resultCandidate;
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} else {
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result = null;
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}
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}
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}
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return result;
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}
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}
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private final Class[] getComponentInterfaces() {
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Set interfaces = new HashSet();
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Object[] components = getComponents();
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for (int i = 0; i < components.length; i++) {
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Class componentClass = components[i].getClass();
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while( componentClass != null ) {
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Class[] implemeted = componentClass.getInterfaces();
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List implementedList = Arrays.asList(implemeted);
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interfaces.addAll(implementedList);
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componentClass = componentClass.getSuperclass();
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}
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}
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Class[] result = (Class[]) interfaces.toArray(new Class[interfaces.size()]);
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return result;
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}
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public void registerComponent(Class componentType, Class componentImplementation) throws DuplicateComponentTypeRegistrationException, AssignabilityRegistrationException, NotConcreteRegistrationException, WrongNumberOfConstructorsRegistrationException {
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checkConcrete(componentImplementation);
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checkConstructor(componentImplementation);
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checkTypeCompatibility(componentType, componentImplementation);
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checkTypeDuplication(componentType);
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registeredComponents.add(new ComponentSpecification(componentType, componentImplementation));
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}
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private void checkConstructor(Class componentImplementation) throws WrongNumberOfConstructorsRegistrationException {
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Constructor[] constructors = componentImplementation.getConstructors();
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if (constructors.length != 1) {
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throw new WrongNumberOfConstructorsRegistrationException(constructors.length);
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}
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}
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private void checkTypeDuplication(Class componentType) throws DuplicateComponentTypeRegistrationException {
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for (Iterator iterator = registeredComponents.iterator(); iterator.hasNext();) {
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Class aClass = ((ComponentSpecification) iterator.next()).getComponentType();
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if (aClass == componentType) {
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throw new DuplicateComponentTypeRegistrationException(aClass);
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}
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}
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}
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private void checkTypeCompatibility(Class componentType, Class componentImplementation) throws AssignabilityRegistrationException {
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if (!componentType.isAssignableFrom(componentImplementation)) {
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throw new AssignabilityRegistrationException(componentType, componentImplementation);
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}
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}
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private void checkConcrete(Class componentImplementation) throws NotConcreteRegistrationException {
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boolean isAbstract = (componentImplementation.getModifiers() & Modifier.ABSTRACT) == Modifier.ABSTRACT;
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if (componentImplementation.isInterface() || isAbstract) {
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throw new NotConcreteRegistrationException(componentImplementation);
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}
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}
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public void registerComponent(Object component) throws PicoRegistrationException {
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registerComponent(component.getClass(), component);
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}
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public void registerComponent(Class componentType, Object component) throws PicoRegistrationException {
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checkTypeCompatibility(componentType, component.getClass());
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checkTypeDuplication(componentType);
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componentTypeToInstanceMap.put(componentType, component);
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orderedComponents.add(component);
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unmanagedComponents.add(component);
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}
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public void addParameterToComponent(Class componentType, Class parameter, Object arg) {
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if (!parametersForComponent.containsKey(componentType)) {
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parametersForComponent.put(componentType, new ArrayList());
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}
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List args = (List) parametersForComponent.get(componentType);
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args.add(new ParameterSpec(arg));
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}
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public void registerComponent(Class componentImplementation) throws DuplicateComponentTypeRegistrationException, AssignabilityRegistrationException, NotConcreteRegistrationException, WrongNumberOfConstructorsRegistrationException {
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registerComponent(componentImplementation, componentImplementation);
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}
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private class ParameterSpec {
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private Object arg;
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ParameterSpec(Object parameter) {
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this.arg = parameter;
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}
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}
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public void instantiateComponents() throws PicoInitializationException {
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if (initialized == false) {
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initializeComponents();
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checkUnsatisfiedDependencies();
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initialized = true;
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} else {
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throw new IllegalStateException("PicoContainer Started Already");
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}
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}
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261
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262
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263
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30
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private void initializeComponents() throws AmbiguousComponentResolutionException, PicoInvocationTargetInitailizationException {
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boolean progress = true;
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30
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while (progress == true) {
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266
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69
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progress = false;
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267
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268
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for (Iterator iterator = registeredComponents.iterator(); iterator.hasNext();) {
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269
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ComponentSpecification componentSpec = (ComponentSpecification) iterator.next();
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Class componentImplementation = componentSpec.getComponentImplementation();
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141
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Class componentType = componentSpec.getComponentType();
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272
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273
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if (componentTypeToInstanceMap.get(componentType) == null) {
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boolean reused = reuseImplementationIfAppropriate(componentType, componentImplementation);
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74
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if (reused) {
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1
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progress = true;
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} else {
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278
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279
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73
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progress = hookEmUp(componentImplementation, componentType, progress);
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}
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}
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282
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}
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283
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}
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284
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}
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285
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286
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73
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protected boolean hookEmUp(Class componentImplementation, Class componentType, boolean progress) throws AmbiguousComponentResolutionException, PicoInvocationTargetInitailizationException {
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287
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73
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Constructor[] constructors = componentImplementation.getConstructors();
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288
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73
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Constructor constructor = constructors[0];
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289
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73
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Class[] parameters = constructor.getParameterTypes();
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290
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291
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73
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List paramSpecs = (List) parametersForComponent.get(componentImplementation);
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73
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paramSpecs = paramSpecs == null ? Collections.EMPTY_LIST : new LinkedList(paramSpecs);
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293
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294
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295
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73
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Object[] args = new Object[parameters.length];
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296
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73
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for (int i = 0; i < parameters.length; i++) {
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297
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69
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Class param = parameters[i];
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298
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69
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args[i] = getComponentForParam(param);
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299
|
68
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if (args[i] == null && !paramSpecs.isEmpty()) {
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300
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10
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args[i] = ((ParameterSpec) paramSpecs.remove(0)).arg;
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301
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}
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302
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}
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303
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72
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if (hasAnyNullArguments(args) == false) {
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304
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53
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Object componentInstance = null;
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305
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53
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componentInstance = makeComponentInstance(componentType, constructor, args);
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306
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|
307
|
52
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componentTypeToInstanceMap.put(componentType, componentInstance);
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308
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52
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orderedComponents.add(componentInstance);
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309
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52
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progress = true;
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310
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}
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311
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|
312
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71
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return progress;
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313
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}
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314
|
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|
315
|
74
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protected boolean reuseImplementationIfAppropriate(Class componentType, Class componentImplementation) {
|
316
|
74
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Set compEntries = componentTypeToInstanceMap.entrySet();
|
317
|
74
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for (Iterator iterator = compEntries.iterator();
|
318
|
122
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iterator.hasNext();) {
|
319
|
49
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Map.Entry entry = (Map.Entry) iterator.next();
|
320
|
49
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Object exisitingCompClass = entry.getValue();
|
321
|
49
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if (exisitingCompClass.getClass() == componentImplementation) {
|
322
|
1
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componentTypeToInstanceMap.put(componentType, exisitingCompClass);
|
323
|
1
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return true;
|
324
|
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}
|
325
|
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}
|
326
|
73
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return false;
|
327
|
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}
|
328
|
|
|
329
|
28
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private void checkUnsatisfiedDependencies() throws UnsatisfiedDependencyStartupException {
|
330
|
28
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for (Iterator iterator = registeredComponents.iterator(); iterator.hasNext();) {
|
331
|
53
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ComponentSpecification componentSpecification = (ComponentSpecification) iterator.next();
|
332
|
53
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Class componentType = componentSpecification.getComponentType();
|
333
|
53
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if (componentTypeToInstanceMap.get(componentType) == null) {
|
334
|
2
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throw new UnsatisfiedDependencyStartupException(componentType);
|
335
|
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}
|
336
|
|
}
|
337
|
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}
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338
|
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|
339
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52
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protected Object makeComponentInstance(Class type, Constructor constructor, Object[] args) throws PicoInvocationTargetInitailizationException {
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340
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52
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return componentFactory.createComponent(type, constructor, args);
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341
|
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}
|
342
|
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|
343
|
68
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protected Object getComponentForParam(Class parameter) throws AmbiguousComponentResolutionException {
|
344
|
68
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Object result = null;
|
345
|
|
|
346
|
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|
347
|
|
|
348
|
68
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List candidateClasses = new ArrayList();
|
349
|
|
|
350
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68
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for (Iterator iterator = componentTypeToInstanceMap.entrySet().iterator(); iterator.hasNext();) {
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351
|
71
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Map.Entry entry = (Map.Entry) iterator.next();
|
352
|
71
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Class clazz = (Class) entry.getKey();
|
353
|
71
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if (parameter.isAssignableFrom(clazz)) {
|
354
|
37
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candidateClasses.add(clazz);
|
355
|
37
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result = entry.getValue();
|
356
|
|
}
|
357
|
|
}
|
358
|
|
|
359
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|
|
360
|
68
|
if (candidateClasses.size() > 1) {
|
361
|
1
|
Class[] ambiguities = (Class[]) candidateClasses.toArray(new Class[candidateClasses.size()]);
|
362
|
1
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throw new AmbiguousComponentResolutionException(ambiguities);
|
363
|
|
}
|
364
|
|
|
365
|
67
|
return result;
|
366
|
|
}
|
367
|
|
|
368
|
72
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private boolean hasAnyNullArguments(Object[] args) {
|
369
|
72
|
for (int i = 0; i < args.length; i++) {
|
370
|
64
|
Object arg = args[i];
|
371
|
64
|
if (arg == null) {
|
372
|
19
|
return true;
|
373
|
|
}
|
374
|
|
}
|
375
|
53
|
return false;
|
376
|
|
}
|
377
|
|
|
378
|
91
|
public Object getComponent(Class componentType) {
|
379
|
91
|
return componentTypeToInstanceMap.get(componentType);
|
380
|
|
}
|
381
|
|
|
382
|
23
|
public Class[] getComponentTypes() {
|
383
|
|
|
384
|
23
|
Set types = componentTypeToInstanceMap.keySet();
|
385
|
23
|
return (Class[]) types.toArray(new Class[types.size()]);
|
386
|
|
}
|
387
|
|
|
388
|
13
|
public boolean hasComponent(Class componentType) {
|
389
|
13
|
return getComponent(componentType) != null;
|
390
|
|
}
|
391
|
|
}
|
392
|
|
|