1 files changed, 179 insertions, 0 deletions
diff --git a/hibernate/org.eclipse.emf.teneo.hibernate/src/org/eclipse/emf/teneo/hibernate/mapping/identifier/IdentifierUtil.java b/hibernate/org.eclipse.emf.teneo.hibernate/src/org/eclipse/emf/teneo/hibernate/mapping/identifier/IdentifierUtil.java
new file mode 100755
index 000000000..ab1c4fdc7
--- /dev/null
+++ b/hibernate/org.eclipse.emf.teneo.hibernate/src/org/eclipse/emf/teneo/hibernate/mapping/identifier/IdentifierUtil.java
@@ -0,0 +1,179 @@
+/**
+ * <copyright>
+ *
+ * Copyright (c) 2005, 2006, 2007, 2008 Springsite BV (The Netherlands) and others
+ * 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:
+ *   Martin Taal
+ * </copyright>
+ *
+ * $Id: IdentifierUtil.java,v 1.9 2010/11/12 09:33:33 mtaal Exp $
+ */
+
+package org.eclipse.emf.teneo.hibernate.mapping.identifier;
+
+import java.io.Serializable;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.util.Hashtable;
+
+import org.eclipse.emf.ecore.EObject;
+import org.eclipse.emf.teneo.classloader.ClassLoaderResolver;
+import org.eclipse.emf.teneo.classloader.StoreClassLoadException;
+import org.eclipse.emf.teneo.hibernate.HbDataStore;
+import org.eclipse.emf.teneo.hibernate.HbMapperException;
+import org.hibernate.EntityMode;
+import org.hibernate.engine.ForeignKeys;
+import org.hibernate.engine.SessionImplementor;
+import org.hibernate.impl.SessionFactoryImpl;
+import org.hibernate.impl.SessionImpl;
+import org.hibernate.persister.entity.EntityPersister;
+import org.hibernate.type.AbstractStandardBasicType;
+import org.hibernate.type.Type;
+
+/**
+ * Different identifier related utilities. The current Elver store
+ * representation does not use the EMF id concept but uses the underlying
+ * hibernate identifier. This allows more flexibility than the EMF identifier.
+ * 
+ * @author <a href="mailto:mtaal@elver.org">Martin Taal</a>
+ * @version $Revision: 1.9 $
+ */
+
+public class IdentifierUtil {
+	/** The logger */
+	// private static Log log = LogFactory.getLog(IdentifierUtil.class);
+	/** Separator used in encoding the class name and value */
+	private static final String ENCODING_SEPARATOR = ";";
+
+	/** HashTable with identifier types hashed by entityname */
+	private static final Hashtable<String, Type> identifierTypeCache = new Hashtable<String, Type>();
+
+	/** HashTable with cached constructors */
+	private static final Hashtable<String, Constructor<?>> constructorCache = new Hashtable<String, Constructor<?>>();
+
+	/**
+	 * Returns the identifiertype on the basis of the class of the passed object
+	 */
+	public static Type getIdentifierType(String className,
+			SessionImplementor session) {
+		Type type = identifierTypeCache.get(className);
+		if (type != null) {
+			return type;
+		}
+
+		final Type identifierType = ((SessionImpl) session).getFactory()
+				.getClassMetadata(className).getIdentifierType();
+		identifierTypeCache.put(className, identifierType);
+		return identifierType;
+	}
+
+	/** Converts an id to a string representation */
+	public static String idToString(Object object, SessionImplementor session) {
+
+		return createIDString(
+				getIdentifierType(object.getClass().getName(), session),
+				getID(object, session));
+	}
+
+	/** String to id */
+	public static Serializable stringToId(String className,
+			SessionImplementor Session, String idStr) {
+		return extractID(getIdentifierType(className, Session), idStr);
+	}
+
+	/** Creates the serializable id object from a string */
+	private static Serializable extractID(Type type, String idString) {
+		// first handle the most common case
+		if (type instanceof AbstractStandardBasicType) {
+			final AbstractStandardBasicType<?> ntype = (AbstractStandardBasicType<?>) type;
+			return (Serializable) ntype.fromStringValue(idString);
+		}
+
+		// for all other cases the classname of the type is encoded into the
+		// field
+		final String className = idString.substring(0,
+				idString.indexOf(ENCODING_SEPARATOR));
+		final String strValue = idString.substring(1 + idString
+				.indexOf(ENCODING_SEPARATOR));
+
+		Constructor<?> constructor = constructorCache.get(className);
+		if (constructor == null) {
+			try {
+				final Class<?> clazz = ClassLoaderResolver
+						.classForName(className);
+				constructor = clazz
+						.getConstructor(new Class[] { String.class });
+			} catch (StoreClassLoadException e) {
+				throw new HbMapperException("Class " + className + " not found");
+			} catch (NoSuchMethodException e) {
+				throw new HbMapperException(
+						"Class "
+								+ className
+								+ " does not have a constructor with a String parameter!");
+			}
+		}
+		if (constructor == null) {
+			throw new HbMapperException("Class " + className
+					+ " does not have a constructor with a String parameter!");
+		}
+
+		try {
+			return (Serializable) constructor
+					.newInstance(new Object[] { strValue });
+		} catch (InvocationTargetException e) {
+			throw new HbMapperException("Can not instantiate: " + className
+					+ " using value " + strValue);
+		} catch (InstantiationException e) {
+			throw new HbMapperException("Can not instantiate: " + className
+					+ " using value " + strValue);
+		} catch (IllegalAccessException e) {
+			throw new HbMapperException("Can not instantiate: " + className
+					+ " using value " + strValue);
+		}
+	}
+
+	/** Returns the id of the passed object */
+	@SuppressWarnings("deprecation")
+	public static Serializable getID(EObject eobj, HbDataStore hd) {
+		final String entityName = hd.getEntityNameStrategy().toEntityName(
+				eobj.eClass());
+		final EntityPersister entityPersister = ((SessionFactoryImpl) hd
+				.getSessionFactory()).getEntityPersister(entityName);
+		return entityPersister.getIdentifier(eobj, EntityMode.MAP);
+	}
+
+	/** Returns the id of the passed object */
+	public static Serializable getID(Object object, SessionImplementor session) {
+		Serializable id = session.getContextEntityIdentifier(object);
+		if (id != null) {
+			return id;
+		}
+
+		// now with entity name
+		final String entityName = session.bestGuessEntityName(object);
+		id = ForeignKeys.getEntityIdentifierIfNotUnsaved(entityName, object,
+				session);
+		if (id != null) {
+			return id;
+		}
+		// now the slow way
+		return (Serializable) IdentifierCacheHandler.getInstance()
+				.getID(object);
+	}
+
+	/** Creates an id string from a serializable object */
+	private static String createIDString(Type type, Serializable id) {
+		if (type instanceof AbstractStandardBasicType) {
+			@SuppressWarnings("unchecked")
+			final AbstractStandardBasicType<Object> ntype = (AbstractStandardBasicType<Object>) type;
+			return ntype.toString(id);
+		}
+
+		return id.getClass().getName() + ENCODING_SEPARATOR + id.toString();
+	}
+}
+\ No newline at end of file