Examples of oracle.toplink.essentials.mappings.DatabaseMapping

Package oracle.toplink.essentials.mappings

Examples of oracle.toplink.essentials.mappings.DatabaseMapping

oracle.toplink.essentials.mappings.DatabaseMapping
Purpose: Defines how an attribute of an object maps to and from the database
Responsibilities:
- Define type of relationship (1:1/1:M/M:M/etc.)
- Define instance variable name and fields names required
- Define any additional properties (ownership, indirection, read only, etc.)
- Control building the value for the instance variable from the database row
- Control building the database fields from the object
- Control any pre/post updating/inserting/deleting required to maintain the relationship
- Merges object changes for unit of work.
- Clones objects for unit of work.
- cache computed information to optimize performance
@author Sati @since TOPLink/Java 1.0


    /** Returns the type of the attribute with the specified name in the
     * specified owner class. 
     */ 
    public Object resolveAttribute(Object ownerClass, String attribute) {
        DatabaseMapping mapping = 
            resolveAttributeMapping(ownerClass, attribute);
        return getType(mapping);
    }

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        return (desc != null) && desc.isAggregateDescriptor();
    }


    /** Returns true if the specified type denotes an embedded attribute. */
    public boolean isEmbeddedAttribute(Object ownerClass, String attribute) {
        DatabaseMapping mapping = 
            resolveAttributeMapping(ownerClass, attribute);
        return (mapping != null) && mapping.isAggregateMapping();
    }

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        return (mapping != null) && mapping.isAggregateMapping();
    }


    /** Returns true if the specified type denotes a simple state attribute. */
    public boolean isSimpleStateAttribute(Object ownerClass, String attribute) {
        DatabaseMapping mapping = 
            resolveAttributeMapping(ownerClass, attribute);
        return (mapping != null) && mapping.isDirectToFieldMapping();
    }

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    /** Returns true if the specified attribute denotes a single valued
     * or collection valued relationship attribute. 
     */
    public boolean isRelationship(Object ownerClass, String attribute) {
        DatabaseMapping mapping = 
            resolveAttributeMapping(ownerClass, attribute);
        return (mapping != null) && 
               (mapping.isObjectReferenceMapping() || 
                mapping.isOneToManyMapping() || 
                mapping.isManyToManyMapping());
    }

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    /** Returns true if the specified attribute denotes a single valued
     * relationship attribute. 
     */
    public boolean isSingleValuedRelationship(Object ownerClass, 
                                              String attribute) {
        DatabaseMapping mapping = 
            resolveAttributeMapping(ownerClass, attribute);
        return (mapping != null) && mapping.isObjectReferenceMapping();
    }

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    /** Returns true if the specified attribute denotes a collection valued
     * relationship attribute. 
     */
    public boolean isCollectionValuedRelationship(Object ownerClass, 
                                                  String attribute) {
        DatabaseMapping mapping = 
            resolveAttributeMapping(ownerClass, attribute);
        return (mapping != null) && 
            (mapping.isOneToManyMapping() || mapping.isManyToManyMapping());
    }

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     */
    protected Vector buildDeleteAllStatementsForMappings(SQLCall selectCallForExist, SQLSelectStatement selectStatementForExist, boolean dontCheckDescriptor) {
        Vector deleteStatements = new Vector();
        Iterator itMappings = getDescriptor().getMappings().iterator();
        while(itMappings.hasNext()) {
            DatabaseMapping mapping = (DatabaseMapping)itMappings.next();
            if(mapping.isManyToManyMapping() || mapping.isDirectCollectionMapping()) {
                if(dontCheckDescriptor || mapping.getDescriptor().equals(getDescriptor())) {
                    Vector sourceFields = null;
                    Vector targetFields = null;
                    if(mapping.isManyToManyMapping()) {
                        sourceFields = ((ManyToManyMapping)mapping).getSourceKeyFields();
                        targetFields = ((ManyToManyMapping)mapping).getSourceRelationKeyFields();
                    } else if(mapping.isDirectCollectionMapping()) {
                        sourceFields = ((DirectCollectionMapping)mapping).getSourceKeyFields();
                        targetFields = ((DirectCollectionMapping)mapping).getReferenceKeyFields();
                    }
                    deleteStatements.addElement(buildDeleteAllStatementForMapping(selectCallForExist, selectStatementForExist, sourceFields, targetFields));
                }

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     */
    protected Vector buildDeleteAllStatementsForMappingsWithTempTable(ClassDescriptor descriptor, DatabaseTable rootTable, Collection rootTablePrimaryKeyFields, boolean dontCheckDescriptor) {
        Vector deleteStatements = new Vector();
        Iterator itMappings = descriptor.getMappings().iterator();
        while(itMappings.hasNext()) {
            DatabaseMapping mapping = (DatabaseMapping)itMappings.next();
            if(mapping.isManyToManyMapping() || mapping.isDirectCollectionMapping()) {
                if(dontCheckDescriptor || mapping.getDescriptor().equals(descriptor)) {
                    Vector sourceFields = null;
                    Vector targetFields = null;
                    if(mapping.isManyToManyMapping()) {
                        sourceFields = ((ManyToManyMapping)mapping).getSourceKeyFields();
                        targetFields = ((ManyToManyMapping)mapping).getSourceRelationKeyFields();
                    } else if(mapping.isDirectCollectionMapping()) {
                        sourceFields = ((DirectCollectionMapping)mapping).getSourceKeyFields();
                        targetFields = ((DirectCollectionMapping)mapping).getReferenceKeyFields();
                    }


                    DatabaseTable targetTable = ((DatabaseField)targetFields.firstElement()).getTable();

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                // it should be either QueryKeyExpression or FieldExpression
                fieldExpression = (DataExpression)fieldObject;
            }


            DatabaseField field = null;
            DatabaseMapping mapping = null;
            if(attributeName != null) {
                mapping = getDescriptor().getObjectBuilder().getMappingForAttributeName(attributeName);
                if (mapping != null && !mapping.getFields().isEmpty()) {
                    field = (DatabaseField)mapping.getFields().firstElement();
                }
                if(field == null) {
                    throw QueryException.updateAllQueryAddUpdateDoesNotDefineField(getDescriptor(), getQuery(), attributeName);
                }
                baseExpression = ((UpdateAllQuery)getQuery()).getExpressionBuilder().get(attributeName);
            } else if (fieldExpression != null) {
                // it should be either QueryKeyExpression or ExpressionBuilder
                if (fieldExpression.getBaseExpression() instanceof ExpressionBuilder) {
                    field = getDescriptor().getObjectBuilder().getFieldForQueryKeyName(fieldExpression.getName());
                }
                if(field == null) {
                    DataExpression fieldExpressionClone = (DataExpression)fieldExpression.clone();
                    fieldExpressionClone.getBuilder().setQueryClass(getQuery().getReferenceClass());
                    fieldExpressionClone.getBuilder().setSession(getSession().getRootSession(null));
                    field = fieldExpressionClone.getField();
                    if(field == null) {
                        throw QueryException.updateAllQueryAddUpdateDoesNotDefineField(getDescriptor(), getQuery(), fieldExpression.toString());
                    }
                }
                mapping = getDescriptor().getObjectBuilder().getMappingForField(field);
                baseExpression = fieldExpression;
            }


            Object valueObject = entry.getValue();
            Vector fields;
            Vector values;
            Vector baseExpressions;
            if(mapping != null && mapping.isOneToOneMapping()) {
                fields = mapping.getFields();
                int fieldsSize = fields.size();
                values = oracle.toplink.essentials.internal.helper.NonSynchronizedVector.newInstance(fieldsSize);
                baseExpressions = oracle.toplink.essentials.internal.helper.NonSynchronizedVector.newInstance(fieldsSize);
                for(int i=0; i<fieldsSize; i++) {
                    if(valueObject instanceof ConstantExpression) {

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     */
    private void postInitTableSchema(ClassDescriptor desc) {
        Iterator mappingIter = desc.getMappings().iterator();


        while (mappingIter.hasNext()) {
            DatabaseMapping mapping = (DatabaseMapping) mappingIter.next();


            if (mapping.isManyToManyMapping()) {
                buildRelationTableDefinition((ManyToManyMapping) mapping);
            } else if (mapping.isDirectCollectionMapping()) {
                buildDirectCollectionTableDefinition((DirectCollectionMapping) mapping, desc);
            } else if (mapping.isAggregateCollectionMapping()) {
                //need to figure out the target foreign key field and add it into the aggregate target table
                addForeignkeyFieldToAggregateTargetTable((AggregateCollectionMapping) mapping);
            } else if (mapping.isForeignReferenceMapping()) {
                if (mapping.isOneToOneMapping())
                    addForeignKeyFieldToSourceTargetTable((OneToOneMapping) mapping);
                else if (mapping.isOneToManyMapping())
                    addForeignKeyFieldToSourceTargetTable((OneToManyMapping) mapping);
            }
        }
        processAdditionalTablePkFields(desc);
    }

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