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package org.eclipse.fx.ecp.ui.impl;
import java.util.HashSet;
import java.util.Set;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.Platform;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecp.edit.util.ECPApplicableTester;
import org.eclipse.emf.ecp.edit.util.StaticApplicableTester;
import org.eclipse.emf.edit.provider.IItemPropertyDescriptor;
import org.eclipse.fx.ecp.ui.Control;
import org.eclipse.fx.ecp.ui.Control.Factory;
import org.osgi.framework.Bundle;
public class ControlFactoryRegistryImpl implements Control.Factory.Registry {
private static final String CONTROL_EXTENSION = "org.eclipse.fx.ecp.ui.controls";
private static final String CLASS_ATTRIBUTE = "class";
private static final String CONTROL_ID = "id";
private static final String CONTROL_CLASS_ATTRIBUTE = "controlClass";
private static final String LABEL_ATTRIBUTE = "showLabel";
private static final String TEST_DYNAMIC = "dynamicTest";
private static final String CONTROL_TESTER = "testClass";
private static final String TEST_STATIC = "staticTest";
private static final String TESTER_PRIORITY = "priority";
private static final String TESTER_CLASSTYPE = "supportedClassType";
private static final String TESTER_EOBJECT = "supportedEObject";
private static final String TESTER_FEATURE = "supportedFeature";
private static final String TESTER_SINGLEVALUE = "singleValue";
private final Set<ControlFactoryDescriptor> controlDescriptors = new HashSet<ControlFactoryDescriptor>();
public ControlFactoryRegistryImpl() {
readExtensionPoint();
}
public Factory getFactory(Class<?> controlClass, IItemPropertyDescriptor propertyDescriptor, EObject modelElement) {
ControlFactoryDescriptor factoryDescriptor = getControlFactoryCandidate(controlClass, propertyDescriptor,
modelElement);
return factoryDescriptor != null ? factoryDescriptor.createFactory() : null;
}
private void readExtensionPoint() {
IConfigurationElement[] configurationElements = Platform.getExtensionRegistry().getConfigurationElementsFor(
CONTROL_EXTENSION);
for (IConfigurationElement configurationElement : configurationElements) {
try {
String id = configurationElement.getAttribute(CONTROL_ID);
Control.Factory factory = (Control.Factory) configurationElement
.createExecutableExtension(CLASS_ATTRIBUTE);
boolean showLabel = Boolean.parseBoolean(configurationElement.getAttribute(LABEL_ATTRIBUTE));
String controlClass = configurationElement.getAttribute(CONTROL_CLASS_ATTRIBUTE);
// Class<?> resolvedWidgetClass = loadClass(configurationElement.getContributor().getName(), controlClass);
Set<ECPApplicableTester> testers = new HashSet<ECPApplicableTester>();
for (IConfigurationElement testerExtension : configurationElement.getChildren()) {
if (TEST_DYNAMIC.equals(testerExtension.getName())) {
testers.add((ECPApplicableTester) testerExtension.createExecutableExtension(CONTROL_TESTER));
} else if (TEST_STATIC.equals(testerExtension.getName())) {
boolean singleValue = Boolean.parseBoolean(testerExtension.getAttribute(TESTER_SINGLEVALUE));
int priority = Integer.parseInt(testerExtension.getAttribute(TESTER_PRIORITY));
String type = testerExtension.getAttribute(TESTER_CLASSTYPE);
Class<?> supportedClassType = Class.forName(type);
String eObject = testerExtension.getAttribute(TESTER_EOBJECT);
if (eObject == null)
eObject = "org.eclipse.emf.ecore.EObject";
Class<? extends EObject> supportedEObject = loadClass(testerExtension.getContributor()
.getName(), eObject);
String supportedFeature = testerExtension.getAttribute(TESTER_FEATURE);
testers.add(new StaticApplicableTester(singleValue, priority, supportedClassType,
supportedEObject, supportedFeature));
}
}
controlDescriptors.add(new ControlFactoryDescriptor(id, factory, showLabel, testers));
} catch (ClassNotFoundException e1) {
// TODO log exception
e1.printStackTrace();
} catch (CoreException e1) {
// TODO log exception
e1.printStackTrace();
}
}
}
@SuppressWarnings("unchecked")
private static <T> Class<T> loadClass(String bundleName, String clazz) throws ClassNotFoundException {
Bundle bundle = Platform.getBundle(bundleName);
if (bundle == null) {
// TODO externalize strings
throw new ClassNotFoundException(clazz + " cannot be loaded because bundle " + bundleName
+ " cannot be resolved");
}
return (Class<T>) bundle.loadClass(clazz);
}
private ControlFactoryDescriptor getControlFactoryCandidate(Class<?> clazz,
IItemPropertyDescriptor itemPropertyDescriptor, EObject modelElement) {
int highestPriority = -1;
ControlFactoryDescriptor bestCandidate = null;
for (ControlFactoryDescriptor descriptor : controlDescriptors) {
int currentPriority = -1;
for (ECPApplicableTester tester : descriptor.getTesters()) {
int testerPriority = tester.isApplicable(itemPropertyDescriptor, modelElement);
if (testerPriority > currentPriority)
currentPriority = testerPriority;
}
if (currentPriority > highestPriority) {
highestPriority = currentPriority;
bestCandidate = descriptor;
}
}
return bestCandidate;
}
}
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