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/*******************************************************************************
* Copyright (c) 2012 Mia-Software.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Nicolas Bros (Mia-Software) - Bug 379683 - customizable Tree content provider
* Gregoire Dupe (Mia-Software) - Bug 385292 - [CustomizedTreeContentProvider] StackOverFlow when refreshing a TreeViewer with ICustomizedTreeContentProvider
* Gregoire Dupe (Mia-Software) - Bug 386387 - [CustomizedTreeContentProvider] The TreeElements are not preserved between two calls to getElements()
*******************************************************************************/
package org.eclipse.emf.facet.custom.ui.internal;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Set;
import org.eclipse.emf.ecore.EAttribute;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EReference;
import org.eclipse.emf.ecore.ETypedElement;
import org.eclipse.emf.facet.custom.core.ICustomizationManager;
import org.eclipse.emf.facet.custom.core.exception.CustomizationException;
import org.eclipse.emf.facet.custom.metamodel.v0_2_0.internal.treeproxy.EAttributeTreeElement;
import org.eclipse.emf.facet.custom.metamodel.v0_2_0.internal.treeproxy.EObjectTreeElement;
import org.eclipse.emf.facet.custom.metamodel.v0_2_0.internal.treeproxy.EReferenceTreeElement;
import org.eclipse.emf.facet.custom.metamodel.v0_2_0.internal.treeproxy.EStructuralFeatureTreeElement;
import org.eclipse.emf.facet.custom.metamodel.v0_2_0.internal.treeproxy.TreeElement;
import org.eclipse.emf.facet.custom.metamodel.v0_2_0.internal.treeproxy.TreeproxyFactory;
import org.eclipse.emf.facet.custom.ui.IContentPropertiesHandler;
import org.eclipse.emf.facet.custom.ui.IContentPropertiesHandlerFactory;
import org.eclipse.emf.facet.custom.ui.ICustomizedContentProvider;
import org.eclipse.emf.facet.custom.ui.ICustomizedTreeContentProvider;
import org.eclipse.emf.facet.efacet.core.FacetUtils;
import org.eclipse.emf.facet.efacet.core.IFacetManager;
import org.eclipse.emf.facet.efacet.core.exception.FacetManagerException;
import org.eclipse.emf.facet.util.core.Logger;
import org.eclipse.jface.viewers.Viewer;
@SuppressWarnings("deprecation")
// @SuppressWarnings("deprecation") : Bug 380229 - [deprecated] ICustomizedContentProvider
public class CustomizedTreeContentProvider implements ICustomizedTreeContentProvider, ICustomizedContentProvider {
private final ICustomizationManager customManager;
private final IContentPropertiesHandler contentHandler;
private Object previousInput;
private Object[] rootElements;
public CustomizedTreeContentProvider(final ICustomizationManager customManager) {
this.customManager = customManager;
this.contentHandler = IContentPropertiesHandlerFactory.DEFAULT.createIContentPropertiesHandler(customManager);
}
protected Object[] getRootElements(final Object inputElement) {
Object[] result;
if (inputElement == null) {
result = new Object[0];
} else if (inputElement instanceof EObject) {
result = new EObject[] { (EObject) inputElement };
} else if (inputElement instanceof Collection<?>) {
result = ((Collection<?>) inputElement).toArray();
} else if (inputElement instanceof EObject[]) {
result = (EObject[]) inputElement;
} else {
throw new IllegalArgumentException("Unhandled input element type: " + inputElement.getClass().getSimpleName()); //$NON-NLS-1$
}
return result;
}
public Object[] getElements(final Object inputElement) {
Object[] result;
if (this.previousInput == inputElement) {
result = this.rootElements;
} else {
this.previousInput = inputElement;
final Object[] elements = getRootElements(inputElement);
final List<Object> elementList = new ArrayList<Object>();
for (final Object element : elements) {
if (!isVisible(element, null)) {
continue;
}
if (element instanceof EObject) {
final EObjectTreeElement eObjectProxy = createEObjectProxy(element, null);
elementList.add(eObjectProxy);
} else {
elementList.add(element);
}
}
result = elementList.toArray();
this.rootElements = result;
}
return result;
}
protected static EObjectTreeElement createEObjectProxy(
final Object element, final EStructuralFeatureTreeElement parent) {
final EObject eObject = (EObject) element;
final EObjectTreeElement eObjectProxy = TreeproxyFactory.eINSTANCE.createEObjectTreeElement();
eObjectProxy.setEObject(eObject);
eObjectProxy.setParent(parent);
eObject.eAdapters().add(new TreeElementAdapter(eObjectProxy));
return eObjectProxy;
}
public Object[] getChildren(final Object parentElement) {
Object[] result;
if (parentElement == null) {
result = new Object[0];
} else if (parentElement instanceof EObjectTreeElement) {
final EObjectTreeElement eObjectProxy = (EObjectTreeElement) parentElement;
result = getChildren(eObjectProxy);
} else if (parentElement instanceof EAttributeTreeElement) {
final EAttributeTreeElement attributeProxy = (EAttributeTreeElement) parentElement;
result = getChildren(attributeProxy);
} else if (parentElement instanceof EReferenceTreeElement) {
final EReferenceTreeElement referenceProxy = (EReferenceTreeElement) parentElement;
result = getChildren(referenceProxy);
} else {
Logger.logError("Unknown element in tree: " + parentElement.getClass(), Activator.getDefault()); //$NON-NLS-1$
result = new Object[0];
}
return result;
}
private Object[] getChildren(final EObjectTreeElement treeElement) {
List<EStructuralFeatureTreeElement> children = treeElement.getSfTreeElmement();
if (children == null || children.isEmpty()) {
children = new ArrayList<EStructuralFeatureTreeElement>();
children.addAll(createAttributes(treeElement));
children.addAll(createReferences(treeElement));
}
return children.toArray();
}
public Object[] getChildren(final EAttributeTreeElement attributeProxy) {
final List<Object> children = new ArrayList<Object>();
final EAttribute eAttribute = attributeProxy.getEAttribute();
if (eAttribute.isMany()) {
final TreeElement parent = attributeProxy.getParent();
if (!(parent instanceof EObjectTreeElement)) {
throw new IllegalStateException("An attribute should appear only under a model element"); //$NON-NLS-1$
}
final EObjectTreeElement parentProxy = (EObjectTreeElement) parent;
final EObject eObject = parentProxy.getEObject();
try {
final IFacetManager facetManager = this.customManager.getFacetManager();
final List<Object> result = facetManager.getOrInvokeMultiValued(eObject, eAttribute, null);
for (final Object object : result) {
if (object instanceof EObject) {
final EObject childEObject = (EObject) object;
children.add(createEObjectProxy(childEObject, attributeProxy));
}
children.add(object);
}
} catch (final FacetManagerException e) {
Logger.logError(e, Activator.getDefault());
}
}
return children.toArray();
}
public Object[] getChildren(final EReferenceTreeElement referenceProxy) {
List<? extends Object> result;
final EReference eReference = referenceProxy.getEReference();
final TreeElement parent = referenceProxy.getParent();
if (!(parent instanceof EObjectTreeElement)) {
throw new IllegalStateException("A reference should appear only under a model element"); //$NON-NLS-1$
}
final EObjectTreeElement parentProxy = (EObjectTreeElement) parent;
final EObject eObject = parentProxy.getEObject();
if (eReference.isMany()) {
result = getMultiValuedReferenceChildren(eReference, eObject, referenceProxy);
} else {
final Object child = getSingleValuedReferenceChild(eReference, eObject, referenceProxy);
if (child == null) {
result = Collections.emptyList();
} else {
result = Collections.singletonList(child);
}
}
return result.toArray();
}
private TreeElement getSingleValuedReferenceChild(final EReference eReference,
final EObject eObject, final EReferenceTreeElement parent) {
TreeElement child = null;
if (parent.getReferedEObjectTE() == null || parent.getReferedEObjectTE().size() == 0) {
try {
final IFacetManager facetManager = this.customManager
.getFacetManager();
final EObject referedEObject = facetManager.getOrInvoke(
eObject, eReference, EObject.class);
if (referedEObject != null) {
child = createEObjectProxy(referedEObject, parent);
}
} catch (final FacetManagerException e) {
Logger.logError(e, Activator.getDefault());
}
} else {
child = parent.getReferedEObjectTE().get(0);
}
return child;
}
private List<EObjectTreeElement> getMultiValuedReferenceChildren(
final EReference eReference, final EObject eObject,
final EReferenceTreeElement parent) {
List<EObjectTreeElement> children = new ArrayList<EObjectTreeElement>();
if (parent.getReferedEObjectTE() == null || parent.getReferedEObjectTE().size() == 0) {
try {
final IFacetManager facetManager = this.customManager
.getFacetManager();
final List<Object> result = facetManager
.getOrInvokeMultiValued(eObject, eReference, null);
for (final Object object : result) {
if (object instanceof EObject) {
final EObject childEObject = (EObject) object;
children.add(createEObjectProxy(childEObject, parent));
}
}
} catch (final FacetManagerException e) {
Logger.logError(e, Activator.getDefault());
}
} else {
children = parent.getReferedEObjectTE();
}
return children;
}
private Collection<EAttributeTreeElement> createAttributes(final EObjectTreeElement treeElement) {
final EObject eObject = treeElement.getEObject();
final EClass eClass = eObject.eClass();
final IFacetManager facetManager = this.customManager.getFacetManager();
final List<EAttribute> allAttributes = new ArrayList<EAttribute>();
allAttributes.addAll(eClass.getEAllAttributes());
try {
final Set<EAttribute> facetAttributes = FacetUtils.getETypedElements(eObject, EAttribute.class, facetManager);
allAttributes.addAll(facetAttributes);
} catch (final FacetManagerException e) {
Logger.logError(e, Activator.getDefault());
}
return createAttributeProxies(allAttributes, treeElement);
}
private Collection<EAttributeTreeElement> createAttributeProxies(final List<EAttribute> allAttributes, final EObjectTreeElement parent) {
final EObject eObject = parent.getEObject();
final List<EAttributeTreeElement> result = new ArrayList<EAttributeTreeElement>();
for (final EAttribute eAttribute : allAttributes) {
if (isVisible(eObject, eAttribute)) {
final EAttributeTreeElement attributeProxy = TreeproxyFactory.eINSTANCE.createEAttributeTreeElement();
attributeProxy.setEAttribute(eAttribute);
attributeProxy.setParent(parent);
result.add(attributeProxy);
}
}
return result;
}
private Collection<EReferenceTreeElement> createReferences(final EObjectTreeElement treeElement) {
final EObject eObject = treeElement.getEObject();
final EClass eClass = eObject.eClass();
final IFacetManager facetManager = this.customManager.getFacetManager();
final List<EReference> allReferences = new ArrayList<EReference>();
allReferences.addAll(eClass.getEAllReferences());
try {
final Set<EReference> facetReferences = FacetUtils.getETypedElements(eObject, EReference.class, facetManager);
allReferences.addAll(facetReferences);
} catch (final FacetManagerException e) {
Logger.logError(e, Activator.getDefault());
}
return createReferenceProxies(allReferences, treeElement);
}
private Collection<EReferenceTreeElement> createReferenceProxies(final List<EReference> allReferences, final EObjectTreeElement parent) {
final EObject eObject = parent.getEObject();
final List<EReferenceTreeElement> result = new ArrayList<EReferenceTreeElement>();
for (final EReference eReference : allReferences) {
if (isVisible(eObject, eReference)) {
final EReferenceTreeElement referenceProxy = TreeproxyFactory.eINSTANCE.createEReferenceTreeElement();
referenceProxy.setEReference(eReference);
referenceProxy.setParent(parent);
result.add(referenceProxy);
}
}
return result;
}
public Object getParent(final Object element) {
Object result = null;
if (element instanceof TreeElement) {
final TreeElement treeElement = (TreeElement) element;
result = treeElement.eContainer();
}
return result;
}
public boolean hasChildren(final Object element) {
return getChildren(element).length > 0;
}
public void dispose() {
// nothing to do
}
public void inputChanged(final Viewer viewer, final Object oldInput, final Object newInput) {
// nothing to do
}
public ICustomizationManager getCustomizationManager() {
return this.customManager;
}
public boolean isVisible(final Object object, final ETypedElement eTypedElement) {
Boolean result = Boolean.TRUE;
if (object instanceof EObject) {
final EObject eObject = (EObject) object;
try {
result = this.customManager.getCustomValueOf(eObject, eTypedElement, this.contentHandler.getIsVisible(), Boolean.class);
} catch (final CustomizationException e) {
Logger.logError(e, Activator.getDefault());
}
}
return result.booleanValue();
}
}
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