/**
* <copyright>
* </copyright>
*
* $Id$
*/
package tefkat.engine.runtime.impl;
import java.lang.ref.WeakReference;
import java.util.Iterator;
import java.util.Map;
import java.util.WeakHashMap;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.util.BasicEList;
import org.eclipse.emf.common.util.EList;
import org.eclipse.emf.common.util.TreeIterator;
import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.impl.ENotificationImpl;
import org.eclipse.emf.ecore.resource.Resource;
import tefkat.engine.runtime.ContainerExtent;
import tefkat.engine.runtime.RuntimePackage;
/**
* <!-- begin-user-doc -->
* An implementation of the model object '<em><b>Container Extent</b></em>'.
* <!-- end-user-doc -->
* <p>
* The following features are implemented:
* <ul>
* <li>{@link tefkat.engine.runtime.impl.ContainerExtentImpl#getResource <em>Resource</em>}</li>
* </ul>
* </p>
*
* @generated
*/
public class ContainerExtentImpl extends ExtentImpl implements ContainerExtent {
/**
* <!-- begin-user-doc -->
* <!-- end-user-doc -->
* @generated
*/
public static final String copyright = "Copyright michael lawley 2004";
/**
* The default value of the '{@link #getResource() <em>Resource</em>}' attribute.
* <!-- begin-user-doc -->
* <!-- end-user-doc -->
* @see #getResource()
* @generated
* @ordered
*/
protected static final Resource RESOURCE_EDEFAULT = null;
private static final Map exactlyCache = new WeakHashMap();
private static final Map inexactlyCache = new WeakHashMap();
/**
* The cached value of the '{@link #getResource() <em>Resource</em>}' attribute.
* <!-- begin-user-doc -->
* <!-- end-user-doc -->
* @see #getResource()
* @generated
* @ordered
*/
protected Resource resource = RESOURCE_EDEFAULT;
/**
* <!-- begin-user-doc -->
* <!-- end-user-doc -->
* @generated
*/
protected ContainerExtentImpl() {
super();
}
/**
* <!-- begin-user-doc -->
* <!-- end-user-doc -->
* @generated
*/
protected EClass eStaticClass() {
return RuntimePackage.Literals.CONTAINER_EXTENT;
}
/**
* <!-- begin-user-doc -->
* <!-- end-user-doc -->
* @generated
*/
public Resource getResource() {
return resource;
}
/**
* <!-- begin-user-doc -->
* <!-- end-user-doc -->
* @generated NOT
*/
public void setResource(Resource newResource) {
Resource oldResource = resource;
resource = newResource;
cacheInvalidate();
if (eNotificationRequired())
eNotify(new ENotificationImpl(this, Notification.SET, RuntimePackage.CONTAINER_EXTENT__RESOURCE, oldResource, resource));
}
/**
* <!-- begin-user-doc -->
* <!-- end-user-doc -->
* @generated
*/
public Object eGet(int featureID, boolean resolve, boolean coreType) {
switch (featureID) {
case RuntimePackage.CONTAINER_EXTENT__RESOURCE:
return getResource();
}
return super.eGet(featureID, resolve, coreType);
}
/**
* <!-- begin-user-doc -->
* <!-- end-user-doc -->
* @generated
*/
public void eSet(int featureID, Object newValue) {
switch (featureID) {
case RuntimePackage.CONTAINER_EXTENT__RESOURCE:
setResource((Resource)newValue);
return;
}
super.eSet(featureID, newValue);
}
/**
* <!-- begin-user-doc -->
* <!-- end-user-doc -->
* @generated
*/
public void eUnset(int featureID) {
switch (featureID) {
case RuntimePackage.CONTAINER_EXTENT__RESOURCE:
setResource(RESOURCE_EDEFAULT);
return;
}
super.eUnset(featureID);
}
/**
* <!-- begin-user-doc -->
* <!-- end-user-doc -->
* @generated
*/
public boolean eIsSet(int featureID) {
switch (featureID) {
case RuntimePackage.CONTAINER_EXTENT__RESOURCE:
return RESOURCE_EDEFAULT == null ? resource != null : !RESOURCE_EDEFAULT.equals(resource);
}
return super.eIsSet(featureID);
}
/**
* <!-- begin-user-doc -->
* <!-- end-user-doc -->
* @generated
*/
public String toString() {
if (eIsProxy()) return super.toString();
StringBuffer result = new StringBuffer(super.toString());
result.append(" (resource: ");
result.append(resource);
result.append(')');
return result.toString();
}
public void add(EObject obj) {
cacheInvalidate();
resource.getContents().add(obj);
}
public boolean contains(EObject instance) {
Resource res = instance.eResource();
return null != res && res.equals(resource);
}
public TreeIterator getAllContents() {
return resource.getAllContents();
}
public EList getObjectsByClass(EClass theClass, boolean isExactly) {
EList objects = getAllObjectsByClass(theClass, isExactly);
return objects;
}
public void remove(EObject obj) {
cacheInvalidate();
resource.getContents().remove(obj);
}
private void cacheInvalidate() {
exactlyCache.clear();
inexactlyCache.clear();
}
/**
* FIXME Yikes, need to invalidate the cache if the extent is modified, but
* in the context of a Tefkat transformation, only tracking extents will get
* modified.
*
* @param theClass
* @param isExactly
* @return
*/
private EList getAllObjectsByClass(final EClass theClass, final boolean isExactly) {
EList objects;
if (null == theClass) {
// null class means no type constraint -- i.e., get all instances
objects = (EList) cacheLookup(exactlyCache, theClass);
if (null == objects) {
objects = getMatchingObjects(new Filter() {
public boolean filter(EObject eObject) {
return true;
}
});
cacheStore(exactlyCache, theClass, objects);
}
} else if (isExactly) {
objects = (EList) cacheLookup(exactlyCache, theClass);
if (null == objects) {
objects = getMatchingObjects(new Filter() {
public boolean filter(EObject eObject) {
return theClass.equals(eObject.eClass());
}
});
cacheStore(exactlyCache, theClass, objects);
}
} else {
objects = (EList) cacheLookup(inexactlyCache, theClass);
if (null == objects) {
objects = getMatchingObjects(new Filter() {
public boolean filter(EObject eObject) {
return theClass.isSuperTypeOf(eObject.eClass());
}
});
cacheStore(inexactlyCache, theClass, objects);
}
}
return objects;
}
private EList getMatchingObjects(Filter filter) {
EList objects = new BasicEList();
Iterator itr = resource.getAllContents();
while (itr.hasNext()) {
EObject obj = (EObject) itr.next();
if (filter.filter(obj)) {
objects.add(obj);
}
}
return objects;
}
private Object cacheLookup(Map cache, Object key) {
// Can't cache if underlying resource has changed
if (getResource().isModified()) {
return null;
}
Object result = cache.get(key);
if (null != result) {
result = ((WeakReference) result).get();
}
return result;
}
private void cacheStore(Map cache, Object key, Object value) {
// Can't cache if underlying resource has changed
cache.put(key, new WeakReference(value));
}
static private interface Filter {
boolean filter(EObject eObject);
}
} //ContainerExtentImpl