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org.nakedobjects.plugins.headless.viewer.internal.DomainObjectInvocationHandler Maven / Gradle / Ivy
package org.nakedobjects.plugins.headless.viewer.internal;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import org.nakedobjects.applib.events.CollectionAccessEvent;
import org.nakedobjects.applib.events.InteractionEvent;
import org.nakedobjects.applib.events.ObjectTitleEvent;
import org.nakedobjects.applib.events.PropertyAccessEvent;
import org.nakedobjects.applib.events.UsabilityEvent;
import org.nakedobjects.applib.events.ValidityEvent;
import org.nakedobjects.applib.events.VisibilityEvent;
import org.nakedobjects.metamodel.adapter.NakedObject;
import org.nakedobjects.metamodel.authentication.AuthenticationSession;
import org.nakedobjects.metamodel.commons.lang.StringUtils;
import org.nakedobjects.metamodel.consent.InteractionInvocationMethod;
import org.nakedobjects.metamodel.consent.InteractionResult;
import org.nakedobjects.metamodel.interactions.ObjectTitleContext;
import org.nakedobjects.metamodel.runtimecontext.RuntimeContext;
import org.nakedobjects.metamodel.spec.JavaSpecification;
import org.nakedobjects.metamodel.spec.NakedObjectSpecification;
import org.nakedobjects.metamodel.spec.feature.NakedObjectAction;
import org.nakedobjects.metamodel.spec.feature.NakedObjectMember;
import org.nakedobjects.metamodel.spec.feature.OneToManyAssociation;
import org.nakedobjects.metamodel.spec.feature.OneToOneAssociation;
import org.nakedobjects.metamodel.util.NakedObjectUtils;
import org.nakedobjects.plugins.headless.applib.DisabledException;
import org.nakedobjects.plugins.headless.applib.HeadlessViewer;
import org.nakedobjects.plugins.headless.applib.HiddenException;
import org.nakedobjects.plugins.headless.applib.InteractionException;
import org.nakedobjects.plugins.headless.applib.InvalidException;
import org.nakedobjects.plugins.headless.applib.ViewObject;
import org.nakedobjects.plugins.headless.applib.HeadlessViewer.ExecutionMode;
import org.nakedobjects.plugins.headless.viewer.internal.util.Constants;
import org.nakedobjects.plugins.headless.viewer.internal.util.MethodPrefixFinder;
public class DomainObjectInvocationHandler extends DelegatingInvocationHandlerDefault {
/**
* The title() method; may be null .
*/
protected Method titleMethod;
/**
* The save() method from {@link ViewObject#save()}.
*/
protected Method saveMethod;
/**
* The underlying() method from {@link ViewObject#underlying()}.
*/
protected Method underlyingMethod;
private final Map> collectionViewObjectsByMethod = new HashMap>();
private final Map> mapViewObjectsByMethod = new HashMap>();
public DomainObjectInvocationHandler(
final T delegate,
final HeadlessViewer embeddedViewer,
final ExecutionMode mode,
final RuntimeContext runtimeContext) {
super(delegate, embeddedViewer, mode, runtimeContext);
try {
titleMethod = delegate.getClass().getMethod("title", new Class[] {});
saveMethod = ViewObject.class.getMethod("save", new Class[] {});
underlyingMethod = ViewObject.class.getMethod("underlying", new Class[] {});
} catch (final NoSuchMethodException e) {}
}
@Override
public Object invoke(final Object proxyObject, final Method method, final Object[] args) throws Throwable {
if (isObjectMethod(method) ) {
return delegate(method, args);
}
final NakedObject targetAdapter = getRuntimeContext().getAdapterFor(getDelegate());
if (isTitleMethod(method)) {
return handleTitleMethod(method, args, targetAdapter);
}
final NakedObjectSpecification targetNoSpec = targetAdapter.getSpecification();
// save method, through the proxy
if (isSaveMethod(method)) {
return handleSaveMethod(getAuthenticationSession(), targetAdapter, targetNoSpec);
}
if (isUnderlyingMethod(method)) {
return getDelegate();
}
final NakedObjectMember nakedObjectMember = locateAndCheckMember(method);
final String memberName = nakedObjectMember.getName();
final String methodName = method.getName();
final String prefix = checkPrefix(methodName);
if (isDefaultMethod(prefix) || isChoicesMethod(prefix)) {
return method.invoke(getDelegate(), args);
}
final boolean isGetterMethod = isGetterMethod(prefix);
final boolean isSetterMethod = isSetterMethod(prefix);
final boolean isAddToMethod = isAddToMethod(prefix);
final boolean isRemoveFromMethod = isRemoveFromMethod(prefix);
// for all members, check visibility and usability
checkVisibility(getAuthenticationSession(), targetAdapter, nakedObjectMember);
if (nakedObjectMember.isOneToOneAssociation()) {
final OneToOneAssociation otoa = (OneToOneAssociation) nakedObjectMember;
if (isGetterMethod) {
return handleGetterMethodOnProperty(args, targetAdapter, otoa, methodName);
}
if (isSetterMethod) {
checkUsability(getAuthenticationSession(), targetAdapter, nakedObjectMember);
return handleSetterMethodOnProperty(args, getAuthenticationSession(), targetAdapter, otoa, methodName);
}
}
if (nakedObjectMember.isOneToManyAssociation()) {
final OneToManyAssociation otma = (OneToManyAssociation) nakedObjectMember;
if (isGetterMethod) {
return handleGetterMethodOnCollection(method, args, targetAdapter, otma, memberName);
}
if (isAddToMethod) {
checkUsability(getAuthenticationSession(), targetAdapter, nakedObjectMember);
return handleCollectionAddToMethod(args, targetAdapter, otma, methodName);
}
if (isRemoveFromMethod) {
checkUsability(getAuthenticationSession(), targetAdapter, nakedObjectMember);
return handleCollectionRemoveFromMethod(args, targetAdapter, otma, methodName);
}
}
// filter out
if (isGetterMethod) {
throw new UnsupportedOperationException(String.format(
"Can only invoke 'get' on properties or collections; '%s' represents %s", methodName, decode(nakedObjectMember)));
}
if (isSetterMethod) {
throw new UnsupportedOperationException(String.format("Can only invoke 'set' on properties; '%s' represents %s",
methodName, decode(nakedObjectMember)));
}
if (isAddToMethod) {
throw new UnsupportedOperationException(String.format("Can only invoke 'addTo' on collections; '%s' represents %s",
methodName, decode(nakedObjectMember)));
}
if (isRemoveFromMethod) {
throw new UnsupportedOperationException(String.format(
"Can only invoke 'removeFrom' on collections; '%s' represents %s", methodName, decode(nakedObjectMember)));
}
if (nakedObjectMember instanceof NakedObjectAction) {
checkUsability(getAuthenticationSession(), targetAdapter, nakedObjectMember);
final NakedObjectAction noa = (NakedObjectAction) nakedObjectMember;
return handleActionMethod(args, getAuthenticationSession(), targetAdapter, noa, memberName);
}
throw new UnsupportedOperationException(String.format("Unknown member type '%s'", nakedObjectMember));
}
// /////////////////////////////////////////////////////////////////
// title
// /////////////////////////////////////////////////////////////////
private Object handleTitleMethod(final Method method, final Object[] args, final NakedObject targetAdapter)
throws IllegalAccessException, InvocationTargetException {
resolveIfRequired(targetAdapter);
final NakedObjectSpecification targetNoSpec = targetAdapter.getSpecification();
final ObjectTitleContext titleContext = targetNoSpec.createTitleInteractionContext(getAuthenticationSession(),
InteractionInvocationMethod.BY_USER, targetAdapter);
final ObjectTitleEvent titleEvent = titleContext.createInteractionEvent();
notifyListeners(titleEvent);
return titleEvent.getTitle();
}
// /////////////////////////////////////////////////////////////////
// save
// /////////////////////////////////////////////////////////////////
private Object handleSaveMethod(final AuthenticationSession session, final NakedObject targetAdapter, final NakedObjectSpecification targetNoSpec) {
final InteractionResult interactionResult = targetNoSpec.isValidResult(targetAdapter);
notifyListenersAndVetoIfRequired(interactionResult);
if (getExecutionMode() == ExecutionMode.EXECUTE) {
if (targetAdapter.isTransient()) {
getRuntimeContext().makePersistent(targetAdapter);
}
}
return null;
}
// /////////////////////////////////////////////////////////////////
// property - access
// /////////////////////////////////////////////////////////////////
private Object handleGetterMethodOnProperty(
final Object[] args,
final NakedObject targetAdapter,
final OneToOneAssociation otoa,
final String methodName) {
if (args.length != 0) {
throw new IllegalArgumentException("Invoking a 'get' should have no arguments");
}
resolveIfRequired(targetAdapter);
final NakedObject currentReferencedAdapter = otoa.get(targetAdapter);
final Object currentReferencedObj = NakedObjectUtils.unwrap(currentReferencedAdapter);
final PropertyAccessEvent ev = new PropertyAccessEvent(getDelegate(), otoa.getIdentifier(), currentReferencedObj);
notifyListeners(ev);
return currentReferencedObj;
}
// /////////////////////////////////////////////////////////////////
// property - modify
// /////////////////////////////////////////////////////////////////
private Object handleSetterMethodOnProperty(
final Object[] args,
final AuthenticationSession session,
final NakedObject targetAdapter,
final OneToOneAssociation otoa,
final String methodName) {
if (args.length != 1) {
throw new IllegalArgumentException("Invoking a setter should only have a single argument");
}
resolveIfRequired(targetAdapter);
final Object argumentObj = underlying(args[0]);
final NakedObject argumentNO = argumentObj != null? getRuntimeContext().adapterFor(argumentObj): null;
final InteractionResult interactionResult = otoa.isAssociationValid(targetAdapter, argumentNO).getInteractionResult();
notifyListenersAndVetoIfRequired(interactionResult);
if (getExecutionMode() == ExecutionMode.EXECUTE) {
if (argumentNO != null) {
otoa.setAssociation(targetAdapter, argumentNO); // need to wrap arg
} else {
otoa.clearAssociation(targetAdapter);
}
}
objectChangedIfRequired(targetAdapter);
return null;
}
// /////////////////////////////////////////////////////////////////
// collection - access
// /////////////////////////////////////////////////////////////////
private Object handleGetterMethodOnCollection(
final Method method,
final Object[] args,
final NakedObject targetAdapter,
final OneToManyAssociation otma,
final String memberName) {
if (args.length != 0) {
throw new IllegalArgumentException("Invoking a 'get' should have no arguments");
}
resolveIfRequired(targetAdapter);
final NakedObject currentReferencedAdapter = otma.get(targetAdapter);
final Object currentReferencedObj = NakedObjectUtils.unwrap(currentReferencedAdapter);
final CollectionAccessEvent ev = new CollectionAccessEvent(getDelegate(), otma.getIdentifier());
if (currentReferencedObj instanceof Collection) {
final Collection collectionViewObject = lookupViewObject(method, memberName, (Collection) currentReferencedObj, otma);
notifyListeners(ev);
return collectionViewObject;
} else if (currentReferencedObj instanceof Map) {
final Map mapViewObject = lookupViewObject(method, memberName, (Map) currentReferencedObj, otma);
notifyListeners(ev);
return mapViewObject;
}
throw new IllegalArgumentException(
String.format("Collection type '%s' not supported by framework", currentReferencedObj.getClass().getName()));
}
/**
* Looks up (or creates) a proxy for this object.
*/
private Collection lookupViewObject(
final Method method,
final String memberName,
final Collection collectionToLookup,
final OneToManyAssociation otma) {
Collection collectionViewObject = collectionViewObjectsByMethod.get(method);
if (collectionViewObject == null) {
if (collectionToLookup instanceof ViewObject) {
collectionViewObject = collectionToLookup;
} else {
collectionViewObject = Proxy.proxy(collectionToLookup, memberName, this, getRuntimeContext(), otma);
}
collectionViewObjectsByMethod.put(method, collectionViewObject);
}
return collectionViewObject;
}
private Map lookupViewObject(
final Method method,
final String memberName,
final Map mapToLookup,
final OneToManyAssociation otma) {
Map mapViewObject = mapViewObjectsByMethod.get(method);
if (mapViewObject == null) {
if (mapToLookup instanceof ViewObject) {
mapViewObject = mapToLookup;
} else {
mapViewObject = Proxy.proxy(mapToLookup, memberName, this, getRuntimeContext(), otma);
}
mapViewObjectsByMethod.put(method, mapViewObject);
}
return mapViewObject;
}
// /////////////////////////////////////////////////////////////////
// collection - add to
// /////////////////////////////////////////////////////////////////
private Object handleCollectionAddToMethod(
final Object[] args,
final NakedObject targetAdapter,
final OneToManyAssociation otma,
final String methodName) {
if (args.length != 1) {
throw new IllegalArgumentException("Invoking a addTo should only have a single argument");
}
resolveIfRequired(targetAdapter);
final Object argumentObj = underlying(args[0]);
if (argumentObj == null) {
throw new IllegalArgumentException("Must provide a non-null object to add");
}
final NakedObject argumentNO = getRuntimeContext().adapterFor(argumentObj);
final InteractionResult interactionResult = otma.isValidToAdd(targetAdapter, argumentNO).getInteractionResult();
notifyListenersAndVetoIfRequired(interactionResult);
if (getExecutionMode() == ExecutionMode.EXECUTE) {
otma.addElement(targetAdapter, argumentNO);
}
objectChangedIfRequired(targetAdapter);
return null;
}
// /////////////////////////////////////////////////////////////////
// collection - remove from
// /////////////////////////////////////////////////////////////////
private Object handleCollectionRemoveFromMethod(
final Object[] args,
final NakedObject targetAdapter,
final OneToManyAssociation otma,
final String methodName) {
if (args.length != 1) {
throw new IllegalArgumentException("Invoking a removeFrom should only have a single argument");
}
resolveIfRequired(targetAdapter);
final Object argumentObj = underlying(args[0]);
if (argumentObj == null) {
throw new IllegalArgumentException("Must provide a non-null object to remove");
}
final NakedObject argumentAdapter = getRuntimeContext().adapterFor(argumentObj);
final InteractionResult interactionResult = otma.isValidToRemove(targetAdapter, argumentAdapter).getInteractionResult();
notifyListenersAndVetoIfRequired(interactionResult);
if (getExecutionMode() == ExecutionMode.EXECUTE) {
otma.removeElement(targetAdapter, argumentAdapter);
}
objectChangedIfRequired(targetAdapter);
return null;
}
// /////////////////////////////////////////////////////////////////
// action
// /////////////////////////////////////////////////////////////////
private Object handleActionMethod(
final Object[] args,
final AuthenticationSession session,
final NakedObject targetAdapter,
final NakedObjectAction noa,
final String memberName) {
final Object[] underlyingArgs = new Object[args.length];
int i = 0;
for (final Object arg : args) {
underlyingArgs[i++] = underlying(arg);
}
final NakedObject[] argAdapters = new NakedObject[underlyingArgs.length];
int j = 0;
for (final Object underlyingArg : underlyingArgs) {
argAdapters[j++] = underlyingArg!=null?getRuntimeContext().adapterFor(underlyingArg):null;
}
final InteractionResult interactionResult = noa.isProposedArgumentSetValid(targetAdapter, argAdapters).getInteractionResult();
notifyListenersAndVetoIfRequired(interactionResult);
if (getExecutionMode() == ExecutionMode.EXECUTE) {
final NakedObject actionReturnNO = noa.execute(targetAdapter, argAdapters);
return NakedObjectUtils.unwrap(actionReturnNO);
}
objectChangedIfRequired(targetAdapter);
return null;
}
private Object underlying(final Object arg) {
if (arg instanceof ViewObject) {
final ViewObject argViewObject = (ViewObject) arg;
return argViewObject.underlying();
} else {
return arg;
}
}
// /////////////////////////////////////////////////////////////////
// visibility and usability checks (common to all members)
// /////////////////////////////////////////////////////////////////
private void checkVisibility(final AuthenticationSession session, final NakedObject targetNakedObject, final NakedObjectMember nakedObjectMember) {
final InteractionResult interactionResult = nakedObjectMember.isVisible(getAuthenticationSession(), targetNakedObject).getInteractionResult();
notifyListenersAndVetoIfRequired(interactionResult);
}
private void checkUsability(final AuthenticationSession session, final NakedObject targetNakedObject, final NakedObjectMember nakedObjectMember) {
final InteractionResult interactionResult = nakedObjectMember.isUsable(getAuthenticationSession(), targetNakedObject).getInteractionResult();
notifyListenersAndVetoIfRequired(interactionResult);
}
// /////////////////////////////////////////////////////////////////
// notify listeners
// /////////////////////////////////////////////////////////////////
private void notifyListenersAndVetoIfRequired(final InteractionResult interactionResult) {
final InteractionEvent interactionEvent = interactionResult.getInteractionEvent();
notifyListeners(interactionEvent);
if (interactionEvent.isVeto()) {
throw toException(interactionEvent);
}
}
private String decode(final NakedObjectMember nakedObjectMember) {
if (nakedObjectMember instanceof OneToOneAssociation) {
return "a property";
}
if (nakedObjectMember instanceof OneToManyAssociation) {
return "a collection";
}
if (nakedObjectMember instanceof NakedObjectAction) {
return "an action";
}
return "an UNKNOWN member type";
}
/**
* Wraps a {@link InteractionEvent#isVeto() vetoing} {@link InteractionEvent} in a corresponding
* {@link InteractionException}, and returns it.
*/
private InteractionException toException(final InteractionEvent interactionEvent) {
if (!interactionEvent.isVeto()) {
throw new IllegalArgumentException("Provided interactionEvent must be a veto");
}
if (interactionEvent instanceof ValidityEvent) {
final ValidityEvent validityEvent = (ValidityEvent) interactionEvent;
return new InvalidException(validityEvent);
}
if (interactionEvent instanceof VisibilityEvent) {
final VisibilityEvent visibilityEvent = (VisibilityEvent) interactionEvent;
return new HiddenException(visibilityEvent);
}
if (interactionEvent instanceof UsabilityEvent) {
final UsabilityEvent usabilityEvent = (UsabilityEvent) interactionEvent;
return new DisabledException(usabilityEvent);
}
throw new IllegalArgumentException(
"Provided interactionEvent must be a VisibilityEvent, UsabilityEvent or a ValidityEvent");
}
// /////////////////////////////////////////////////////////////////
// switching
// /////////////////////////////////////////////////////////////////
private NakedObjectMember locateAndCheckMember(final Method method) {
final JavaSpecification javaSpecification = getJavaSpecificationOfOwningClass(method);
final NakedObjectMember member = javaSpecification.getMember(method);
if (member == null) {
final String methodName = method.getName();
throw new UnsupportedOperationException("Method '" + methodName
+ "' being invoked does not correspond to any of the object's fields or actions.");
}
return member;
}
private String checkPrefix(final String methodName) {
final String prefix = new MethodPrefixFinder().findPrefix(methodName);
if (StringUtils.in(prefix, Constants.INVALID_PREFIXES)) {
throw new UnsupportedOperationException(String.format(
"Cannot invoke methods with prefix '%s'; use only get/set/addTo/removeFrom/action", prefix));
}
return prefix;
}
protected boolean isTitleMethod(final Method method) {
return method.equals(titleMethod);
}
protected boolean isSaveMethod(final Method method) {
return method.equals(saveMethod);
}
protected boolean isUnderlyingMethod(final Method method) {
return method.equals(underlyingMethod);
}
private boolean isGetterMethod(final String prefix) {
return prefix.equals(Constants.PREFIX_GET);
}
private boolean isSetterMethod(final String prefix) {
return prefix.equals(Constants.PREFIX_SET);
}
private boolean isAddToMethod(final String prefix) {
return prefix.equals(Constants.PREFIX_ADD_TO);
}
private boolean isRemoveFromMethod(final String prefix) {
return prefix.equals(Constants.PREFIX_REMOVE_FROM);
}
private boolean isChoicesMethod(final String prefix) {
return prefix.equals(Constants.PREFIX_CHOICES);
}
private boolean isDefaultMethod(final String prefix) {
return prefix.equals(Constants.PREFIX_DEFAULT);
}
// /////////////////////////////////////////////////////////////////
// Specification lookup
// /////////////////////////////////////////////////////////////////
private JavaSpecification getJavaSpecificationOfOwningClass(final Method method) {
return getJavaSpecification(method.getDeclaringClass());
}
private JavaSpecification getJavaSpecification(final Class clazz) {
final NakedObjectSpecification nos = getSpecification(clazz);
if (!(nos instanceof JavaSpecification)) {
throw new UnsupportedOperationException("Only Java is supported (specification is '"
+ nos.getClass().getCanonicalName() + "')");
}
return (JavaSpecification) nos;
}
private NakedObjectSpecification getSpecification(final Class type) {
final NakedObjectSpecification nos = getSpecificationLoader().loadSpecification(type);
return nos;
}
}
