1 files changed, 241 insertions, 0 deletions
diff --git a/das-java/tags/1.0-incubating-beta1-rc3/rdb/src/main/java/org/apache/tuscany/das/rdb/impl/ChangeSummarizer.java b/das-java/tags/1.0-incubating-beta1-rc3/rdb/src/main/java/org/apache/tuscany/das/rdb/impl/ChangeSummarizer.java
new file mode 100644
index 0000000000..52300e6c9b
--- /dev/null
+++ b/das-java/tags/1.0-incubating-beta1-rc3/rdb/src/main/java/org/apache/tuscany/das/rdb/impl/ChangeSummarizer.java
@@ -0,0 +1,241 @@
+/*
+ * 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.das.rdb.impl;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+
+import org.apache.log4j.Logger;
+import org.apache.tuscany.das.rdb.Command;
+import org.apache.tuscany.das.rdb.config.Column;
+import org.apache.tuscany.das.rdb.config.Relationship;
+import org.apache.tuscany.das.rdb.config.Table;
+import org.apache.tuscany.das.rdb.config.wrapper.MappingWrapper;
+import org.apache.tuscany.das.rdb.config.wrapper.RelationshipWrapper;
+import org.apache.tuscany.das.rdb.config.wrapper.TableWrapper;
+import org.apache.tuscany.sdo.impl.ChangeSummaryImpl;
+
+import commonj.sdo.ChangeSummary;
+import commonj.sdo.DataObject;
+import commonj.sdo.Property;
+import commonj.sdo.Type;
+
+public class ChangeSummarizer {
+
+    private final Logger logger = Logger.getLogger(ChangeSummarizer.class);
+
+    private Changes changes = new Changes();
+
+    private FactoryRegistry registry;
+
+    private MappingWrapper mapping = new MappingWrapper();
+
+    private ConnectionImpl connection;
+
+    private Map generatedKeys = new HashMap();
+
+    public ChangeSummarizer() {
+        // Empty Constructor
+    }
+
+    public Changes loadChanges(DataObject root) {
+        ChangeSummary changeSummary = root.getDataGraph().getChangeSummary();
+        if (changeSummary.isLogging()) {
+            ((ChangeSummaryImpl) changeSummary).summarize();
+        }
+
+        List changedObjects = changeSummary.getChangedDataObjects();
+
+        if (this.logger.isDebugEnabled()) {
+            this.logger.debug("List of changed objects contains " + changedObjects.size() + " object(s)");
+        }
+
+        changes.setInsertOrder(mapping.getInsertOrder());
+        changes.setDeleteOrder(mapping.getDeleteOrder());
+
+        Iterator i = changedObjects.iterator();
+        while (i.hasNext()) {
+            DataObject o = (DataObject) i.next();
+
+            if (!(o.equals(root))) {
+                createChange(changeSummary, o);
+            }
+        }
+
+        return changes;
+    }
+
+    public void createChange(ChangeSummary changeSummary, DataObject changedObject) {
+
+        if (changeSummary.isCreated(changedObject)) {
+            if (this.logger.isDebugEnabled()) {
+                this.logger.debug("Change is a create");
+            }
+            if (!changeSummary.isDeleted(changedObject)) {
+                ChangeFactory factory = getRegistry().getFactory(changedObject.getType());
+                String propagatedID = (String) generatedKeys.get(changedObject.getType().getName());
+                changes.addInsert(factory.createInsertOperation(changedObject, propagatedID));
+            }
+        } else if (changeSummary.isDeleted(changedObject)) {
+            ChangeFactory factory = getRegistry().getFactory(changedObject.getType());
+            if (this.logger.isDebugEnabled()) {
+                this.logger.debug("Change is a delete");
+            }
+            changes.addDelete(factory.createDeleteOperation(changedObject));
+        } else {
+            if (this.logger.isDebugEnabled()) {
+                this.logger.debug("Change is a modify");
+            }
+            List attrList = changeSummary.getOldValues(changedObject);
+            if (hasAttributeChange(attrList)) {
+                ChangeFactory factory = getRegistry().getFactory(changedObject.getType());
+                if (this.logger.isDebugEnabled()) {
+                    this.logger.debug("Attribute Change for " + changedObject.getType().getName());
+                }
+                String propagatedID = (String) generatedKeys.get(changedObject.getType().getName());
+                changes.addUpdate(factory.createUpdateOperation(changedObject, propagatedID));
+            } else {
+                List values = changeSummary.getOldValues(changedObject);
+                Iterator i = values.iterator();
+                while (i.hasNext()) {
+                    ChangeSummary.Setting setting = (ChangeSummary.Setting) i.next();
+                    if (!setting.getProperty().getType().isDataType()) {
+                        if (this.logger.isDebugEnabled()) {
+                            this.logger.debug("Reference change for " + changedObject.getType().getName());
+                        }
+                        Property ref = setting.getProperty();
+                        if (this.logger.isDebugEnabled()) {
+                            this.logger.debug(ref.getName());
+                        }
+                        if (hasState(ref, changedObject)) {
+                            ChangeFactory factory = getRegistry().getFactory(changedObject.getType());
+                            changes.addUpdate(factory.createUpdateOperation(changedObject));
+                        }
+                    }
+                }
+            }
+        }
+
+    }
+
+    private boolean hasState(Property ref, DataObject changedObject) {
+        if (ref.getOpposite().isMany()) {
+            return true;
+        } 
+
+        MappingWrapper mw = this.mapping;
+        if (mw.getConfig() == null) {
+            mw = registry.getFactory(changedObject.getType()).getConfig();
+        }
+        if (mw.getConfig() == null) {
+            return false;
+        }
+
+        Relationship rel = mw.getRelationshipByReference(ref);
+
+        if (!rel.isMany()) {
+            if (rel.isKeyRestricted()) {
+                throw new RuntimeException("Can not modify a one to one relationship that is key restricted");
+            }
+            // This is a one-one relationship
+            Table t = mapping.getTableByTypeName(changedObject.getType().getName());
+            TableWrapper tw = new TableWrapper(t);
+            RelationshipWrapper rw = new RelationshipWrapper(rel);
+            if ((rel.getForeignKeyTable().equals(t.getTableName())) 
+                    && (Collections.disjoint(tw.getPrimaryKeyProperties(), rw.getForeignKeys()))) {
+                return true;
+            }
+
+        }
+
+        return false;
+    }
+
+    private boolean hasAttributeChange(List theChanges) {
+        Iterator i = theChanges.iterator();
+        while (i.hasNext()) {
+            ChangeSummary.Setting setting = (ChangeSummary.Setting) i.next();
+            if (setting.getProperty().getType().isDataType()) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public void addCreateCommand(Type type, Command cmd) {
+        ChangeFactory cf = getRegistry().getFactory(type);
+        cf.setCreateCommand((InsertCommandImpl) cmd);
+        ((CommandImpl) cmd).setConnection(connection);
+    }
+
+    public void addUpdateCommand(Type type, Command cmd) {
+        ChangeFactory cf = getRegistry().getFactory(type);
+        cf.setUpdateCommand((UpdateCommandImpl) cmd);
+        ((CommandImpl) cmd).setConnection(connection);
+    }
+
+    public void addDeleteCommand(Type type, Command cmd) {
+        ChangeFactory cf = getRegistry().getFactory(type);
+        cf.setDeleteCommand((DeleteCommandImpl) cmd);
+        ((CommandImpl) cmd).setConnection(connection);
+
+    }
+
+    private FactoryRegistry getRegistry() {
+        if (this.registry == null) {
+            this.registry = new FactoryRegistry(mapping, connection);
+        }
+        return this.registry;
+    }
+
+    public void setConnection(ConnectionImpl connection) {
+        this.connection = connection;
+    }
+
+    public void setMapping(MappingWrapper map) {
+        this.mapping = map;
+
+        if (mapping.getConfig() == null) {
+            return;
+        }
+
+        Iterator i = mapping.getConfig().getTable().iterator();
+        while (i.hasNext()) {
+            Table t = (Table) i.next();
+            Iterator columns = t.getColumn().iterator();
+            while (columns.hasNext()) {
+                Column c = (Column) columns.next();
+                if (c.isPrimaryKey() && c.isGenerated()) {
+                    if (this.logger.isDebugEnabled()) {
+                        this.logger.debug("adding generated key " + t.getTableName() + "." + c.getColumnName());
+                    }
+
+                    generatedKeys.put(t.getTableName(), c.getColumnName());
+                }
+            }
+        }
+    }
+
+    public ConnectionImpl getConnection() {
+        return this.connection;
+    }
+}