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/*******************************************************************************
* Copyright (c) 2006, 2011 Oracle. 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.jpa.core.internal.context;
import org.eclipse.jpt.common.utility.internal.CollectionTools;
import org.eclipse.jpt.common.utility.internal.Transformer;
import org.eclipse.jpt.common.utility.internal.iterables.CompositeIterable;
import org.eclipse.jpt.common.utility.internal.iterables.FilteringIterable;
import org.eclipse.jpt.common.utility.internal.iterables.SubIterableWrapper;
import org.eclipse.jpt.common.utility.internal.iterables.TransformationIterable;
import org.eclipse.jpt.jpa.core.MappingKeys;
import org.eclipse.jpt.jpa.core.context.AttributeMapping;
import org.eclipse.jpt.jpa.core.context.ReadOnlyTable;
import org.eclipse.jpt.jpa.core.context.TypeMapping;
import org.eclipse.jpt.jpa.core.jpa2.context.DerivedIdentity2_0;
import org.eclipse.jpt.jpa.core.jpa2.context.MapsIdDerivedIdentityStrategy2_0;
import org.eclipse.jpt.jpa.core.jpa2.context.SingleRelationshipMapping2_0;
/**
* Gather some of the behavior common to the Java and XML models. :-(
*/
public class TypeMappingTools {
// ********** single relationship mappings **********
/**
* Return whether the specified attribute is a derived ID for the specified
* type mapping.
*/
public static boolean attributeIsDerivedId(TypeMapping typeMapping, String attributeName) {
if (attributeName == null) {
return false;
}
// the attribute name may be qualified - we test only the first attribute name
int dotIndex = attributeName.indexOf('.');
attributeName = (dotIndex == -1) ? attributeName : attributeName.substring(0, dotIndex);
return CollectionTools.contains(getMapsIdDerivedIdAttributeNames(typeMapping), attributeName);
}
/**
* Return the names of all the ID attributes derived from
* single-relationship mappings for the specified type mapping
* (i.e. the names of the ID attributes that are specified by a single-
* relationship mapping's "maps ID" setting).
*/
protected static Iterable<String> getMapsIdDerivedIdAttributeNames(TypeMapping typeMapping) {
return new TransformationIterable<MapsIdDerivedIdentityStrategy2_0, String>(getMapsIdDerivedIdentityStrategies(typeMapping)) {
@Override
protected String transform(MapsIdDerivedIdentityStrategy2_0 strategy) {
return strategy.getIdAttributeName();
}
};
}
/**
* Return all the single-relationship "maps ID" derived identity strategies
* for the specified type mapping.
*/
protected static Iterable<MapsIdDerivedIdentityStrategy2_0> getMapsIdDerivedIdentityStrategies(TypeMapping typeMapping) {
return new TransformationIterable<DerivedIdentity2_0, MapsIdDerivedIdentityStrategy2_0>(getMapsIdDerivedIdentities(typeMapping)) {
@Override
protected MapsIdDerivedIdentityStrategy2_0 transform(DerivedIdentity2_0 derivedIdentity) {
return derivedIdentity.getMapsIdDerivedIdentityStrategy();
}
};
}
/**
* Return all the single-relationship "maps ID" derived identities for the
* specified type mapping.
*/
protected static Iterable<DerivedIdentity2_0> getMapsIdDerivedIdentities(TypeMapping typeMapping) {
return new FilteringIterable<DerivedIdentity2_0>(getDerivedIdentities(typeMapping)) {
@Override
protected boolean accept(DerivedIdentity2_0 derivedIdentity) {
return derivedIdentity.usesMapsIdDerivedIdentityStrategy();
}
};
}
/**
* Return all the single-relationship derived identities for the specified
* type mapping.
*/
protected static Iterable<DerivedIdentity2_0> getDerivedIdentities(TypeMapping typeMapping) {
return new TransformationIterable<SingleRelationshipMapping2_0, DerivedIdentity2_0>(getSingleRelationshipMappings(typeMapping)) {
@Override
protected DerivedIdentity2_0 transform(SingleRelationshipMapping2_0 mapping) {
return mapping.getDerivedIdentity();
}
};
}
/**
* Return all the single-relationship attribute mappings for the specified
* type mapping.
*/
protected static Iterable<SingleRelationshipMapping2_0> getSingleRelationshipMappings(TypeMapping typeMapping) {
return new SubIterableWrapper<AttributeMapping, SingleRelationshipMapping2_0>(getSingleRelationshipMappings_(typeMapping));
}
@SuppressWarnings("unchecked")
protected static Iterable<AttributeMapping> getSingleRelationshipMappings_(TypeMapping typeMapping) {
return new CompositeIterable<AttributeMapping>(
typeMapping.getAllAttributeMappings(MappingKeys.ONE_TO_ONE_ATTRIBUTE_MAPPING_KEY),
typeMapping.getAllAttributeMappings(MappingKeys.MANY_TO_ONE_ATTRIBUTE_MAPPING_KEY)
);
}
// ********** attribute mappings transformer **********
public static final Transformer<TypeMapping, Iterable<AttributeMapping>> ATTRIBUTE_MAPPINGS_TRANSFORMER = new AttributeMappingsTransformer();
static class AttributeMappingsTransformer
implements Transformer<TypeMapping, Iterable<AttributeMapping>>
{
public Iterable<AttributeMapping> transform(TypeMapping mapping) {
return mapping.getAttributeMappings();
}
}
// ********** associated tables transformer **********
public static final Transformer<TypeMapping, Iterable<ReadOnlyTable>> ASSOCIATED_TABLES_TRANSFORMER = new AssociatedTablesTransformer();
static class AssociatedTablesTransformer
implements Transformer<TypeMapping, Iterable<ReadOnlyTable>>
{
public Iterable<ReadOnlyTable> transform(TypeMapping mapping) {
return mapping.getAssociatedTables();
}
}
// ********** overridable attribute names transformer **********
public static final Transformer<TypeMapping, Iterable<String>> OVERRIDABLE_ATTRIBUTE_NAMES_TRANSFORMER = new OverridableAttributeNamesTransformer();
static class OverridableAttributeNamesTransformer
implements Transformer<TypeMapping, Iterable<String>>
{
public Iterable<String> transform(TypeMapping mapping) {
return mapping.getOverridableAttributeNames();
}
}
// ********** overridable association names transformer **********
public static final Transformer<TypeMapping, Iterable<String>> OVERRIDABLE_ASSOCIATION_NAMES_TRANSFORMER = new OverridableAssociationNamesTransformer();
static class OverridableAssociationNamesTransformer
implements Transformer<TypeMapping, Iterable<String>>
{
public Iterable<String> transform(TypeMapping mapping) {
return mapping.getOverridableAssociationNames();
}
}
// ********** constructor **********
/**
* Suppress default constructor, ensuring non-instantiability.
*/
private TypeMappingTools() {
super();
throw new UnsupportedOperationException();
}
}
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