diff options
Diffstat (limited to 'sdo-java/branches/sdo-1.1-incubating/impl/src/main/java/org/apache/tuscany/sdo/impl/ChangeSummaryImpl.java')
| -rw-r--r-- | sdo-java/branches/sdo-1.1-incubating/impl/src/main/java/org/apache/tuscany/sdo/impl/ChangeSummaryImpl.java | 876 |
1 files changed, 876 insertions, 0 deletions
diff --git a/sdo-java/branches/sdo-1.1-incubating/impl/src/main/java/org/apache/tuscany/sdo/impl/ChangeSummaryImpl.java b/sdo-java/branches/sdo-1.1-incubating/impl/src/main/java/org/apache/tuscany/sdo/impl/ChangeSummaryImpl.java new file mode 100644 index 0000000000..55f3d5449d --- /dev/null +++ b/sdo-java/branches/sdo-1.1-incubating/impl/src/main/java/org/apache/tuscany/sdo/impl/ChangeSummaryImpl.java @@ -0,0 +1,876 @@ +/** + * + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ +package org.apache.tuscany.sdo.impl; + + +import java.util.Collection; +import java.util.Collections; +import java.util.HashMap; +import java.util.HashSet; +import java.util.Iterator; +import java.util.List; +import java.util.Map; +import java.util.Set; + +import org.apache.tuscany.sdo.SDOFactory; +import org.apache.tuscany.sdo.SDOPackage; +import org.apache.tuscany.sdo.util.BasicSequence; +import org.eclipse.emf.common.notify.Notification; +import org.eclipse.emf.common.notify.NotificationChain; +import org.eclipse.emf.common.notify.Notifier; +import org.eclipse.emf.common.util.BasicEList; +import org.eclipse.emf.common.util.EList; +import org.eclipse.emf.common.util.UniqueEList; +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.EStructuralFeature; +import org.eclipse.emf.ecore.InternalEObject; +import org.eclipse.emf.ecore.change.ChangeDescription; +import org.eclipse.emf.ecore.change.FeatureChange; +import org.eclipse.emf.ecore.change.impl.ChangeDescriptionImpl; +import org.eclipse.emf.ecore.change.util.ChangeRecorder; +import org.eclipse.emf.ecore.impl.ENotificationImpl; +import org.eclipse.emf.ecore.util.BasicExtendedMetaData; +import org.eclipse.emf.ecore.util.DelegatingFeatureMap; +import org.eclipse.emf.ecore.util.EcoreUtil; +import org.eclipse.emf.ecore.util.FeatureMap; +import org.eclipse.emf.ecore.util.FeatureMapUtil; +import org.eclipse.emf.ecore.util.InternalEList; + +import commonj.sdo.ChangeSummary; +import commonj.sdo.DataGraph; +import commonj.sdo.DataObject; +import commonj.sdo.Property; +import commonj.sdo.Sequence; + + +/** + * <!-- begin-user-doc --> + * An implementation of the model object '<em><b>EChange Summary</b></em>'. + * <!-- end-user-doc --> + * <p> + * The following features are implemented: + * <ul> + * <li>{@link org.apache.tuscany.sdo.impl.ChangeSummaryImpl#getEDataGraph <em>EData Graph</em>}</li> + * </ul> + * </p> + * + * @generated + */ +public class ChangeSummaryImpl extends ChangeDescriptionImpl implements ChangeSummary +{ + /** + * The cached value of the '{@link #getEDataGraph() <em>EData Graph</em>}' reference. + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @see #getEDataGraph() + * @generated + * @ordered + */ + protected DataGraph eDataGraph = null; + + protected DataObject dataObject = null; + protected SDOChangeRecorder changeRecorder = null; + + protected Set cachedDeletedObjects = null; + protected List cachedCreatedObjects = null; + protected Map cachedSDOObjectChanges = null; + protected boolean isStale = false; + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated + */ + protected ChangeSummaryImpl() + { + super(); + cachedSDOObjectChanges = createThreadSafeMap(); + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated + */ + protected EClass eStaticClass() + { + return SDOPackage.eINSTANCE.getChangeSummary(); + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated NOT + */ + public boolean isLogging() + { + return changeRecorder != null; + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated + */ + public DataGraph getEDataGraph() + { + return eDataGraph; + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated + */ + public NotificationChain basicSetEDataGraph(DataGraph newEDataGraph, NotificationChain msgs) + { + DataGraph oldEDataGraph = eDataGraph; + eDataGraph = newEDataGraph; + if (eNotificationRequired()) + { + ENotificationImpl notification = new ENotificationImpl(this, Notification.SET, SDOPackage.CHANGE_SUMMARY__EDATA_GRAPH, oldEDataGraph, newEDataGraph); + if (msgs == null) msgs = notification; else msgs.add(notification); + } + return msgs; + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated + */ + public void setEDataGraph(DataGraph newEDataGraph) + { + if (newEDataGraph != eDataGraph) + { + NotificationChain msgs = null; + if (eDataGraph != null) + msgs = ((InternalEObject)eDataGraph).eInverseRemove(this, SDOPackage.DATA_GRAPH__ECHANGE_SUMMARY, DataGraph.class, msgs); + if (newEDataGraph != null) + msgs = ((InternalEObject)newEDataGraph).eInverseAdd(this, SDOPackage.DATA_GRAPH__ECHANGE_SUMMARY, DataGraph.class, msgs); + msgs = basicSetEDataGraph(newEDataGraph, msgs); + if (msgs != null) msgs.dispatch(); + } + else if (eNotificationRequired()) + eNotify(new ENotificationImpl(this, Notification.SET, SDOPackage.CHANGE_SUMMARY__EDATA_GRAPH, newEDataGraph, newEDataGraph)); + } + + public DataObject getDataObject() + { + return dataObject; + } + + public void setDataObject(DataObject newDataObject) + { + dataObject = newDataObject; + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated NOT + */ + public void beginLogging() + { + if (isLogging()) + { + throw new IllegalStateException("Already logging"); + } + + getObjectsToAttach().clear(); + getObjectChanges().clear(); + getResourceChanges().clear(); + oldContainmentInformation = null; + + beginRecording(); +// if (eNotificationRequired()) +// eNotify(new ENotificationImpl(this, Notification.SET, SDOPackage.ECHANGE_SUMMARY__LOGGING, false, true)); + } + + /** + * + */ + private void beginRecording() { + changeRecorder = new SDOChangeRecorder(); + if (eDataGraph != null) + { + changeRecorder.beginRecording(Collections.singleton(((DataGraphImpl)eDataGraph).getRootResource())); + } + else if (dataObject != null) + { + changeRecorder.beginRecording(Collections.singleton(dataObject)); + } + else + { + throw new IllegalStateException("ChangeSummary not attached to any data objects"); + } + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated NOT + */ + public void resumeLogging() + { + if (isLogging()) + { + throw new IllegalStateException("Already logging"); + } + + oldContainmentInformation = null; + + beginRecording(); +// if (eNotificationRequired()) +// eNotify(new ENotificationImpl(this, Notification.SET, SDOPackage.ECHANGE_SUMMARY__LOGGING, false, true)); + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated + */ + public NotificationChain eInverseAdd(InternalEObject otherEnd, int featureID, Class baseClass, NotificationChain msgs) + { + if (featureID >= 0) + { + switch (eDerivedStructuralFeatureID(featureID, baseClass)) + { + case SDOPackage.CHANGE_SUMMARY__EDATA_GRAPH: + if (eDataGraph != null) + msgs = ((InternalEObject)eDataGraph).eInverseRemove(this, SDOPackage.DATA_GRAPH__ECHANGE_SUMMARY, DataGraph.class, msgs); + return basicSetEDataGraph((DataGraph)otherEnd, msgs); + default: + return eDynamicInverseAdd(otherEnd, featureID, baseClass, msgs); + } + } + if (eInternalContainer() != null) + msgs = eBasicRemoveFromContainer(msgs); + return eBasicSetContainer(otherEnd, featureID, msgs); + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated + */ + public NotificationChain eInverseRemove(InternalEObject otherEnd, int featureID, Class baseClass, NotificationChain msgs) + { + if (featureID >= 0) + { + switch (eDerivedStructuralFeatureID(featureID, baseClass)) + { + case SDOPackage.CHANGE_SUMMARY__OBJECT_CHANGES: + return ((InternalEList)getObjectChanges()).basicRemove(otherEnd, msgs); + case SDOPackage.CHANGE_SUMMARY__OBJECTS_TO_ATTACH: + return ((InternalEList)getObjectsToAttach()).basicRemove(otherEnd, msgs); + case SDOPackage.CHANGE_SUMMARY__RESOURCE_CHANGES: + return ((InternalEList)getResourceChanges()).basicRemove(otherEnd, msgs); + case SDOPackage.CHANGE_SUMMARY__EDATA_GRAPH: + return basicSetEDataGraph(null, msgs); + default: + return eDynamicInverseRemove(otherEnd, featureID, baseClass, msgs); + } + } + return eBasicSetContainer(null, featureID, msgs); + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated + */ + public Object eGet(int featureID, boolean resolve, boolean coreType) + { + switch (featureID) + { + case SDOPackage.CHANGE_SUMMARY__OBJECT_CHANGES: + if (coreType) return getObjectChanges(); + else return getObjectChanges().map(); + case SDOPackage.CHANGE_SUMMARY__OBJECTS_TO_DETACH: + return getObjectsToDetach(); + case SDOPackage.CHANGE_SUMMARY__OBJECTS_TO_ATTACH: + return getObjectsToAttach(); + case SDOPackage.CHANGE_SUMMARY__RESOURCE_CHANGES: + return getResourceChanges(); + case SDOPackage.CHANGE_SUMMARY__EDATA_GRAPH: + return getEDataGraph(); +// case SDOPackage.CHANGE_SUMMARY__EDATA_OBJECT: +// return getEDataObject(); + } + return eDynamicGet(featureID, resolve, coreType); + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated + */ + public void eSet(int featureID, Object newValue) + { + switch (featureID) + { + case SDOPackage.CHANGE_SUMMARY__OBJECT_CHANGES: + ((EStructuralFeature.Setting)getObjectChanges()).set(newValue); + return; + case SDOPackage.CHANGE_SUMMARY__OBJECTS_TO_DETACH: + getObjectsToDetach().clear(); + getObjectsToDetach().addAll((Collection)newValue); + return; + case SDOPackage.CHANGE_SUMMARY__OBJECTS_TO_ATTACH: + getObjectsToAttach().clear(); + getObjectsToAttach().addAll((Collection)newValue); + return; + case SDOPackage.CHANGE_SUMMARY__RESOURCE_CHANGES: + getResourceChanges().clear(); + getResourceChanges().addAll((Collection)newValue); + return; + case SDOPackage.CHANGE_SUMMARY__EDATA_GRAPH: + setEDataGraph((DataGraph)newValue); + return; + } + eDynamicSet(featureID, newValue); + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated + */ + public void eUnset(int featureID) + { + switch (featureID) + { + case SDOPackage.CHANGE_SUMMARY__OBJECT_CHANGES: + getObjectChanges().clear(); + return; + case SDOPackage.CHANGE_SUMMARY__OBJECTS_TO_DETACH: + getObjectsToDetach().clear(); + return; + case SDOPackage.CHANGE_SUMMARY__OBJECTS_TO_ATTACH: + getObjectsToAttach().clear(); + return; + case SDOPackage.CHANGE_SUMMARY__RESOURCE_CHANGES: + getResourceChanges().clear(); + return; + case SDOPackage.CHANGE_SUMMARY__EDATA_GRAPH: + setEDataGraph((DataGraph)null); + return; + } + eDynamicUnset(featureID); + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated + */ + public boolean eIsSet(int featureID) + { + switch (featureID) + { + case SDOPackage.CHANGE_SUMMARY__OBJECT_CHANGES: + return objectChanges != null && !objectChanges.isEmpty(); + case SDOPackage.CHANGE_SUMMARY__OBJECTS_TO_DETACH: + return objectsToDetach != null && !objectsToDetach.isEmpty(); + case SDOPackage.CHANGE_SUMMARY__OBJECTS_TO_ATTACH: + return objectsToAttach != null && !objectsToAttach.isEmpty(); + case SDOPackage.CHANGE_SUMMARY__RESOURCE_CHANGES: + return resourceChanges != null && !resourceChanges.isEmpty(); + case SDOPackage.CHANGE_SUMMARY__EDATA_GRAPH: + return eDataGraph != null; + } + return eDynamicIsSet(featureID); + } + + protected void uncache() + { + cachedDeletedObjects = null; + cachedCreatedObjects = null; + cachedSDOObjectChanges.clear(); + } + + protected class SDOChangeRecorder extends ChangeRecorder + { + public SDOChangeRecorder() + { + super(); + } + + public void beginRecording(ChangeDescription changeDescription, Collection rootObjects) + { + uncache(); + super.beginRecording(changeDescription, rootObjects); + } + + protected ChangeDescription createChangeDescription() + { + return ChangeSummaryImpl.this; + } + + protected FeatureChange createFeatureChange(EObject eObject, EStructuralFeature eStructuralFeature, Object value, boolean isSet) + { + Property property = (Property)eStructuralFeature; + if (property.isReadOnly()) + { + if (((DataObject)eObject).getDataGraph() != null) + { + throw + new IllegalStateException + ("The property '" + property.getName() + "' of type '" + + property.getContainingType().getName() + "' is read only"); + } + } + return (FeatureChange)SDOFactory.eINSTANCE.createChangeSummarySetting(eStructuralFeature, value, isSet); + } + + protected void consolidateChanges() + { + uncache(); + isStale = false; + + // TODO remove this fixup when https://bugs.eclipse.org/bugs/show_bug.cgi?id=177235 is + // available to us (i.e. we update to EMF 2.3) -- see Tuscany-1164 + boolean isUncontainedRoot = dataObject != null + && ((EObject)dataObject).eContainer() == null + && ((EObject)dataObject).eResource() == null; + + super.consolidateChanges(); + + if(isUncontainedRoot && changeDescription.getObjectsToAttach().contains(dataObject)) { + changeDescription.getObjectsToAttach().remove(dataObject); + } + + } + + protected void addAdapter(Notifier notifier) + { + if (!loadingTargets) return; // Optimize ChangeSummary to not record changes in newly created DOs + + if (notifier instanceof DataObjectImpl) + ((DataObjectImpl)notifier).setChangeRecorder(this); + else + super.addAdapter(notifier); + } + + protected void removeAdapter(Notifier notifier) + { + if (notifier instanceof DataObjectImpl) + ((DataObjectImpl)notifier).setChangeRecorder(null); + else + super.removeAdapter(notifier); + } + + public void notifyChanged(Notification notification) + { + super.notifyChanged(notification); + + Object notifier = notification.getNotifier(); + if (notifier instanceof EObject) + { + cachedSDOObjectChanges.remove(notifier); + Object feature = notification.getFeature(); + if (feature instanceof Property && ((Property)feature).isContainment()) + { + cachedCreatedObjects = null; + cachedDeletedObjects = null; + oldContainmentInformation = null; + } + isStale = true; + } + } + + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated NOT + */ + public void endLogging() + { + if (!isLogging()) + { + throw new IllegalStateException("Not currently logging"); + } + + changeRecorder.endRecording(); + changeRecorder.dispose(); + changeRecorder = null; +// if (eNotificationRequired()) +// eNotify(new ENotificationImpl(this, Notification.SET, SDOPackage.ECHANGE_SUMMARY__LOGGING, true, false)); + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated NOT + */ + public boolean isCreated(DataObject dataObject) + { + return getCachedCreatedObjects().contains(dataObject); + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated NOT + */ + public boolean isDeleted(DataObject dataObject) + { + return getCachedDeletedObjects().contains(dataObject); + } + + protected Set getCachedDeletedObjects() + { + if (cachedDeletedObjects == null) + { + if (isStale()) changeRecorder.consolidateChanges(); + cachedDeletedObjects = new HashSet(); + for (Iterator i = EcoreUtil.getAllContents(getObjectsToAttach()); i.hasNext(); ) + { + cachedDeletedObjects.add(i.next()); + } + } + return cachedDeletedObjects; + } + + protected List getCachedCreatedObjects() + { + if (cachedCreatedObjects == null) + { + if (isStale()) changeRecorder.consolidateChanges(); + cachedCreatedObjects = super.getObjectsToDetach(); + } + return cachedCreatedObjects; + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated NOT + */ + public List getChangedDataObjects() + { + EList result = new UniqueEList.FastCompare(getCachedDeletedObjects()); + result.addAll(getCachedCreatedObjects()); + for (Iterator i = getObjectChanges().iterator(); i.hasNext(); ) + { + Map.Entry entry = (Map.Entry)i.next(); + result.add(entry.getKey()); + } + return result; + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated NOT + */ + public List getOldValues(DataObject dataObject) + { + List sdoSettings = (List)cachedSDOObjectChanges.get(dataObject); + if (sdoSettings != null) + { + return sdoSettings; + } + + if (isStale()) changeRecorder.consolidateChanges(); + List settings = (List)getObjectChanges().get(dataObject); + if (settings == null) + { + settings = Collections.EMPTY_LIST; + } + else + { + for (int i = 0; i < settings.size(); i++) + { + FeatureChange change = (FeatureChange)settings.get(i); + EStructuralFeature feature = change.getFeature(); + if (FeatureMapUtil.isFeatureMap(feature)) + { + final List values = (List)change.getValue(); + if (sdoSettings == null) + { + sdoSettings = new BasicEList(settings); + } + DelegatingFeatureMap featureMap = new DelegatingFeatureMap(((InternalEObject)dataObject), feature) + { + protected final List theList = values; + + protected List delegateList() + { + return theList; + } + }; + + // create new settings and replace the setting for mixed feature + sdoSettings.set(i, SDOFactory.eINSTANCE.createChangeSummarySetting(feature, new BasicSequence(featureMap), change.isSet())); + // add all derived features + for (int k = 0; k < featureMap.size(); k++) + { + EStructuralFeature f = featureMap.getEStructuralFeature(k); + sdoSettings.add(SDOFactory.eINSTANCE.createChangeSummarySetting(f, featureMap.get(f, false), true)); + } + } + } + } + sdoSettings = (sdoSettings != null) ? sdoSettings : settings; + cachedSDOObjectChanges.put(dataObject, sdoSettings); + return sdoSettings; + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated NOT + */ + public boolean isModified(DataObject dataObject) + { + return getObjectChanges().containsKey(dataObject) && !isDeleted(dataObject) && !isCreated(dataObject); + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated NOT + */ + public void summarize() + { + if (!isLogging()) + { + throw new IllegalStateException("Not currently logging"); + } + + changeRecorder.summarize(); + } + + public Setting getOldValue(DataObject dataObject, Property property) + { + for (Iterator i = getOldValues(dataObject).iterator(); i.hasNext(); ) + { + Setting setting = (Setting)i.next(); + if (setting.getProperty() == property) + { + return setting; + } + } + + return null; + } + + public DataObject getOldContainer(DataObject dataObject) + { + return (DataObject)getOldContainer((EObject)dataObject); + } + + public Property getOldContainmentProperty(DataObject dataObject) + { + return (Property)getOldContainmentFeature((EObject)dataObject); + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated NOT + */ + public Sequence getOldSequence(DataObject dataObject) + { + EAttribute mixedFeature = BasicExtendedMetaData.INSTANCE.getMixedFeature((EClass)dataObject.getType()); + if (mixedFeature != null) + { + return (Sequence)getOldValue(dataObject, (Property)mixedFeature).getValue(); + } + return null; + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated NOT + */ + public void undoChanges() + { + if (isLogging()) + { + changeRecorder.summarize(); + } + else + { + uncache(); + } + apply(); + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated NOT + */ + public DataGraph getDataGraph() + { + return getEDataGraph(); + } + + protected Map getOldContainmentInformation() + { + if (oldContainmentInformation == null) + { + if (isStale()) changeRecorder.consolidateChanges(); + super.getOldContainmentInformation(); + } + return oldContainmentInformation; + } + + protected boolean isStale() + { + return isLogging() && isStale; + } + + /** + * <!-- begin-user-doc --> + * <!-- end-user-doc --> + * @generated NOT + */ + public DataObject getRootObject() + { + if (eDataGraph != null) + { + return eDataGraph.getRootObject(); + } + if (dataObject != null) + { + return dataObject; + } + return null; + } + + static protected boolean isContainmentReference(Object feature) + { + return feature instanceof EReference && ((EReference) feature).isContainment(); + } + + public DataObject getOldDataObject(DataObject dataObject) + { + //TODO: Fix this method. Currently, it has the side effect of undoing the unset of contained children references + // of root deleted objects - i.e., when featureChange.apply(oldDataObject) is called. + // + List changes = (List) getObjectChanges().get(dataObject); + if (changes == null) + return dataObject; + EObject oldDataObject = EcoreUtil.copy((EObject)dataObject); + for (Iterator fIter = changes.iterator(); fIter.hasNext(); ) + { + FeatureChange featureChange = (FeatureChange)fIter.next(); + featureChange.apply(oldDataObject); + EStructuralFeature feature = featureChange.getFeature(); + if (FeatureMapUtil.isFeatureMap(feature)) + { + FeatureMap featureMap = (FeatureMap) oldDataObject.eGet(feature); + for (int index = featureMap.size(); index != 0;) + if (isContainmentReference(featureMap.getEStructuralFeature(--index))) + featureMap.setValue(index, getOldDataObject((DataObject) featureMap.getValue(index))); + } + else if (isContainmentReference(feature)) + { + Object value = oldDataObject.eGet(feature); + if (feature.isMany()) + { + changes = (List) value; + for (int index = changes.size(); index != 0;) + changes.set(--index, getOldDataObject((DataObject) changes.get(index))); // Java pushes stack from left to right + } + else + oldDataObject.eSet(feature, getOldDataObject((DataObject) value)); + } + } + + return (DataObject)oldDataObject; + } + + private static Class concurrentHashMapClazz = null; + private static boolean isThreadSafeMapClazzIdentified = false; + + private Map createThreadSafeMap() + { + if (!isThreadSafeMapClazzIdentified) + { + concurrentHashMapClazz = loadConcurrentHashMapClazz(); + isThreadSafeMapClazzIdentified = true; + } + Map threadSafeMap = null; + if (concurrentHashMapClazz == null) + { + threadSafeMap = Collections.synchronizedMap(new HashMap()); + } + else + { + try + { + threadSafeMap = (Map)concurrentHashMapClazz.newInstance(); + } + catch (InstantiationException e) + { + throw new RuntimeException(e); + } + catch (IllegalAccessException e) + { + throw new RuntimeException(e); + } + } + return threadSafeMap; + } + + private static String[] concurrentHashMapClazzNames = new String[] { + "java.util.concurrent.ConcurrentHashMap", + "edu.emory.mathcs.backport.java.util.concurrent.ConcurrentHashMap"}; + + private static Class loadConcurrentHashMapClazz() + { + Class mapClazz = null; + for (int i = 0; i < concurrentHashMapClazzNames.length; i++) + { + String concurrentHashMapClazzName = concurrentHashMapClazzNames[i]; + try + { + mapClazz = Class.forName(concurrentHashMapClazzName, true, Thread.currentThread().getContextClassLoader()); + } + catch (Exception ignored) {} + if (mapClazz != null) + { + break; + } + try + { + mapClazz = Class.forName(concurrentHashMapClazzName); + } + catch (Exception ignored) {} + if (mapClazz != null) + { + break; + } + } + return mapClazz; + } + +} //ChangeSummaryImpl |