org.apache.cayenne.map.ObjEntity Maven / Gradle / Ivy
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* 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,
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* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
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****************************************************************/
package org.apache.cayenne.map;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.SortedMap;
import java.util.TreeMap;
import org.apache.cayenne.CayenneRuntimeException;
import org.apache.cayenne.configuration.ConfigurationNode;
import org.apache.cayenne.configuration.ConfigurationNodeVisitor;
import org.apache.cayenne.dba.TypesMapping;
import org.apache.cayenne.exp.Expression;
import org.apache.cayenne.exp.ExpressionException;
import org.apache.cayenne.exp.ExpressionFactory;
import org.apache.cayenne.map.event.EntityEvent;
import org.apache.cayenne.map.event.ObjEntityListener;
import org.apache.cayenne.util.CayenneMapEntry;
import org.apache.cayenne.util.NameConverter;
import org.apache.cayenne.util.Util;
import org.apache.cayenne.util.XMLEncoder;
import org.apache.commons.collections.Transformer;
/**
* ObjEntity is a mapping descriptor for a DataObject Java class. It contains the
* information about the Java class itself, as well as its mapping to the DbEntity layer.
*/
public class ObjEntity extends Entity implements ObjEntityListener, ConfigurationNode {
final public static int LOCK_TYPE_NONE = 0;
final public static int LOCK_TYPE_OPTIMISTIC = 1;
// do not import CayenneDataObject as it introduces unneeded client dependency
static final String CAYENNE_DATA_OBJECT_CLASS = "org.apache.cayenne.CayenneDataObject";
/**
* A collection of default "generic" entity classes excluded from class generation.
*
* @since 1.2
*/
protected static final Collection DEFAULT_GENERIC_CLASSES = Arrays
.asList(CAYENNE_DATA_OBJECT_CLASS);
protected String superClassName;
protected String className;
protected String dbEntityName;
protected String superEntityName;
protected Expression qualifier;
protected boolean readOnly;
protected int lockType;
protected boolean _abstract;
protected boolean serverOnly;
protected String clientClassName;
protected String clientSuperClassName;
protected List entityListeners;
protected CallbackMap callbacks;
protected boolean excludingDefaultListeners;
protected boolean excludingSuperclassListeners;
protected Map attributeOverrides;
public ObjEntity() {
this(null);
}
public ObjEntity(String name) {
setName(name);
this.lockType = LOCK_TYPE_NONE;
this.callbacks = new CallbackMap();
this.entityListeners = new ArrayList(2);
this.attributeOverrides = new TreeMap();
}
/**
* @since 3.1
*/
public T acceptVisitor(ConfigurationNodeVisitor visitor) {
return visitor.visitObjEntity(this);
}
/**
* Prints itself as XML to the provided XMLEncoder.
*
* @since 1.1
*/
public void encodeAsXML(XMLEncoder encoder) {
encoder.print("");
encoder.indent(1);
if (qualifier != null) {
encoder.print("");
qualifier.encodeAsXML(encoder);
encoder.println(" ");
}
// store attributes
encoder.print(getDeclaredAttributes());
for (Map.Entry override : attributeOverrides.entrySet()) {
encoder.print(" ");
}
/**
* Returns an ObjEntity stripped of any server-side information, such as DbEntity
* mapping. "clientClassName" property of this entity is used to initialize
* "className" property of returned entity.
*
* @since 1.2
*/
public ObjEntity getClientEntity() {
ClientObjEntity entity = new ClientObjEntity(getName());
entity.setClassName(getClientClassName());
entity.setSuperClassName(getClientSuperClassName());
entity.setSuperEntityName(getSuperEntityName());
entity.setDeclaredQualifier(getDeclaredQualifier());
// TODO: should we also copy lock type?
Collection primaryKeys = getMutablePrimaryKeys();
Collection clientPK = new ArrayList(primaryKeys
.size());
for (ObjAttribute attribute : getDeclaredAttributes()) {
ObjAttribute clientAttribute = attribute.getClientAttribute();
entity.addAttribute(clientAttribute);
if (primaryKeys.remove(attribute)) {
clientPK.add(clientAttribute);
}
}
// after all meaningful pks got removed, here we only have synthetic pks left...
for (ObjAttribute attribute : primaryKeys) {
ObjAttribute clientAttribute = attribute.getClientAttribute();
clientPK.add(clientAttribute);
}
entity.setPrimaryKeys(clientPK);
// copy relationships; skip runtime generated relationships
for (ObjRelationship relationship : getDeclaredRelationships()) {
if (relationship.isRuntime()) {
continue;
}
ObjEntity targetEntity = (ObjEntity) relationship.getTargetEntity();
// note that 'isClientAllowed' also checks parent DataMap client policy
// that can be handy in case of cross-map relationships
if (targetEntity == null || !targetEntity.isClientAllowed()) {
continue;
}
entity.addRelationship(relationship.getClientRelationship());
}
// TODO: andrus 2/5/2007 - copy embeddables
// TODO: andrus 2/5/2007 - copy listeners and callback methods
return entity;
}
/**
* Returns a non-null class name. For generic entities with no class specified
* explicitly, default DataMap superclass is used, and if it is not set -
* CayenneDataObject is used.
*/
String getJavaClassName() {
String name = getClassName();
if (name == null && getDataMap() != null) {
name = getDataMap().getDefaultSuperclass();
}
if (name == null) {
name = CAYENNE_DATA_OBJECT_CLASS;
}
return name;
}
/**
* Returns Java class of persistent objects described by this entity. For generic
* entities with no class specified explicitly, default DataMap superclass is used,
* and if it is not set - CayenneDataObject is used. Casts any thrown exceptions into
* CayenneRuntimeException.
*
* @since 1.2
*/
public Class getJavaClass() {
String name = getJavaClassName();
try {
return Util.getJavaClass(name);
}
catch (ClassNotFoundException e) {
throw new CayenneRuntimeException("Failed to load class "
+ name
+ ": "
+ e.getMessage(), e);
}
}
/**
* Returns an unmodifiable list of registered {@link EntityListener} objects. Note
* that since the order of listeners is significant a list, not just a generic
* Collection is returned.
*
* @since 3.0
*/
public List getEntityListeners() {
return Collections.unmodifiableList(entityListeners);
}
/**
* Adds a new EntityListener.
*
* @since 3.0
* @throws IllegalArgumentException if a listener for the same class name is already
* registered.
*/
public void addEntityListener(EntityListener listener) {
for (EntityListener next : entityListeners) {
if (listener.getClassName().equals(next.getClassName())) {
throw new IllegalArgumentException("Duplicate listener for "
+ next.getClassName());
}
}
entityListeners.add(listener);
}
/**
* Removes a listener matching class name.
*
* @since 3.0
*/
public void removeEntityListener(String className) {
Iterator it = entityListeners.iterator();
while (it.hasNext()) {
EntityListener next = it.next();
if (className.equals(next.getClassName())) {
it.remove();
break;
}
}
}
/**
* @since 3.0
*/
public EntityListener getEntityListener(String className) {
for (EntityListener next : entityListeners) {
if (className.equals(next.getClassName())) {
return next;
}
}
return null;
}
/**
* Returns an object that stores callback methods of this entity.
*
* @since 3.0
*/
public CallbackMap getCallbackMap() {
return callbacks;
}
/**
* Returns the type of lock used by this ObjEntity. If this entity is not locked, this
* method would look in a super entity recursively, until it finds a lock somewhere in
* the inheritance hierarchy.
*
* @since 1.1
*/
public int getLockType() {
// if this entity has an explicit lock,
// no need to lookup inheritance hierarchy
if (lockType != LOCK_TYPE_NONE) {
return lockType;
}
ObjEntity superEntity = getSuperEntity();
return (superEntity != null) ? superEntity.getLockType() : lockType;
}
/**
* Returns the type of lock used by this ObjEntity, regardless of what locking type is
* used by super entities.
*
* @since 1.1
*/
public int getDeclaredLockType() {
return lockType;
}
/**
* Sets the type of lock used by this ObjEntity.
*
* @since 1.1
*/
public void setDeclaredLockType(int i) {
lockType = i;
}
/**
* Returns whether this entity is "generic", meaning it is not mapped to a unique Java
* class. Criterion for generic entities is that it either has no Java class mapped or
* its class is the same as DataMap's default superclass, or it is CayenneDataObject.
*
* @since 1.2
*/
public boolean isGeneric() {
String className = getClassName();
return className == null
|| DEFAULT_GENERIC_CLASSES.contains(className)
|| (getDataMap() != null && className.equals(getDataMap()
.getDefaultSuperclass()));
}
/**
* Returns true if this entity is allowed to be used on the client. Checks that parent
* DataMap allows client entities and also that this entity is not explicitly disabled
* for the client use.
*
* @since 1.2
*/
public boolean isClientAllowed() {
return (getDataMap() == null || isServerOnly()) ? false : getDataMap()
.isClientSupported();
}
public boolean isAbstract() {
return _abstract;
}
/**
* Sets whether this entity is abstract only.
*/
public void setAbstract(boolean isAbstract) {
this._abstract = isAbstract;
}
/**
* Returns true if this entity is not available on the client.
*
* @since 1.2
*/
public boolean isServerOnly() {
return serverOnly;
}
/**
* Sets whether this entity is available on the client.
*
* @since 1.2
*/
public void setServerOnly(boolean serverOnly) {
this.serverOnly = serverOnly;
}
/**
* Returns a qualifier that imposes a restriction on what objects belong to this
* entity. Returned qualifier is the one declared in this entity, and does not include
* qualifiers declared in super entities.
*
* @since 1.1
*/
public Expression getDeclaredQualifier() {
return qualifier;
}
/**
* Returns an entity name for a parent entity in the inheritance hierarchy.
*
* @since 1.1
*/
public String getSuperEntityName() {
return superEntityName;
}
/**
* Sets a qualifier that imposes a limit on what objects belong to this entity.
*
* @since 1.1
*/
public void setDeclaredQualifier(Expression qualifier) {
this.qualifier = qualifier;
}
/**
* Sets an entity name for a parent entity in the inheritance hierarchy.
*
* @since 1.1
*/
public void setSuperEntityName(String superEntityName) {
this.superEntityName = superEntityName;
}
/**
* Returns the name of DataObject class described by this entity.
*/
public String getClassName() {
return className;
}
/**
* Sets the name of the DataObject class described by this entity.
*/
public void setClassName(String className) {
this.className = className;
}
/**
* Returns the name of ClientDataObject class described by this entity.
*
* @since 1.2
*/
public String getClientClassName() {
return clientClassName;
}
/**
* Sets the name of the ClientDataObject class described by this entity.
*
* @since 1.2
*/
public void setClientClassName(String clientClassName) {
this.clientClassName = clientClassName;
}
/**
* Returns a fully-qualified name of the super class of the DataObject class. This
* value is used as a hint for class generation. If the entity inherits from another
* entity, a superclass is the class of that entity.
*/
public String getSuperClassName() {
ObjEntity superEntity = getSuperEntity();
return (superEntity != null) ? superEntity.getClassName() : superClassName;
}
/**
* Sets a fully-qualified name of the super class of the DataObject class. This value
* is used as a hint for class generation.
*
* An attempt to set superclass on an inherited entity has no effect, since a class
* of the super entity is always used as a superclass.
*
*/
public void setSuperClassName(String superClassName) {
this.superClassName = superClassName;
}
/**
* Returns a fully-qualified name of the client-side super class of the DataObject
* class. This value is used as a hint for class generation. If the entity inherits
* from another entity, a superclass is the class of that entity.
*
* @since 1.2
*/
public String getClientSuperClassName() {
ObjEntity superEntity = getSuperEntity();
return (superEntity != null)
? superEntity.getClientClassName()
: clientSuperClassName;
}
/**
* Sets a fully-qualified name of the client-side super class of the ClientDataObject
* class. This value is used as a hint for class generation.
*
* An attempt to set superclass on an inherited entity has no effect, since a class
* of the super entity is always used as a superclass.
*
*
* @since 1.2
*/
public void setClientSuperClassName(String clientSuperClassName) {
this.clientSuperClassName = clientSuperClassName;
}
/**
* Returns a "super" entity in the entity inheritance hierarchy.
*
* @since 1.1
*/
public ObjEntity getSuperEntity() {
return (superEntityName != null) ? getNonNullNamespace().getObjEntity(
superEntityName) : null;
}
/**
* Returns a DbEntity associated with this ObjEntity.
*/
public DbEntity getDbEntity() {
// since 1.2 - allow overriding DbEntity in the inheritance hierarchy...
if (dbEntityName != null) {
return getNonNullNamespace().getDbEntity(dbEntityName);
}
ObjEntity superEntity = getSuperEntity();
if (superEntity != null) {
return superEntity.getDbEntity();
}
return null;
}
/**
* Sets the DbEntity used by this ObjEntity.
*
* Setting DbEntity on an inherited entity has no effect, since a class of the
* super entity is always used as a superclass.
*
*/
public void setDbEntity(DbEntity dbEntity) {
this.dbEntityName = (dbEntity != null) ? dbEntity.getName() : null;
}
/**
* Returns an unmodifiable collection of ObjAttributes representing the primary key of
* the table described by this DbEntity. Note that since PK is very often not an
* object property, the returned collection may contain "synthetic" ObjAttributes that
* are created on the fly and are not a part of ObjEntity and will not be a part of
* entity.getAttributes().
*
* @since 3.0
*/
public Collection getPrimaryKeys() {
return Collections.unmodifiableCollection(getMutablePrimaryKeys());
}
private Collection getMutablePrimaryKeys() {
if (getDbEntity() == null) {
throw new CayenneRuntimeException("No DbEntity for ObjEntity: " + getName());
}
Collection pkAttributes = getDbEntity().getPrimaryKeys();
Collection attributes = new ArrayList(pkAttributes
.size());
for (DbAttribute pk : pkAttributes) {
ObjAttribute attribute = getAttributeForDbAttribute(pk);
// create synthetic attribute
if (attribute == null) {
attribute = new SyntheticPKObjAttribute(NameConverter.underscoredToJava(
pk.getName(),
false));
attribute.setDbAttributePath(pk.getName());
attribute.setType(TypesMapping.getJavaBySqlType(pk.getType()));
}
attributes.add(attribute);
}
return attributes;
}
/**
* Returns a named attribute that is either declared in this ObjEntity or is
* inherited. In any case returned attribute 'getEntity' method will return this
* entity. Returns null if no matching attribute is found.
*/
@Override
public Attribute getAttribute(String name) {
Attribute attribute = super.getAttribute(name);
if (attribute != null) {
return attribute;
}
// check embedded attribute
int dot = name.indexOf('.');
if (dot > 0 && dot < name.length() - 1) {
Attribute embedded = getAttribute(name.substring(0, dot));
if (embedded instanceof EmbeddedAttribute) {
return ((EmbeddedAttribute) embedded).getAttribute(name
.substring(dot + 1));
}
}
// check super attribute
ObjEntity superEntity = getSuperEntity();
if (superEntity != null) {
ObjAttribute superAttribute = (ObjAttribute) superEntity.getAttribute(name);
if (superAttribute == null) {
return null;
}
// decorate returned attribute to make it appear as if it belongs to this
// entity
ObjAttribute decoratedAttribute = new ObjAttribute(superAttribute);
decoratedAttribute.setEntity(this);
String pathOverride = attributeOverrides.get(name);
if (pathOverride != null) {
decoratedAttribute.setDbAttributePath(pathOverride);
}
return decoratedAttribute;
}
return null;
}
/**
* Returns a SortedMap of all attributes that either belong to this ObjEntity or
* inherited.
*/
@Override
public SortedMap getAttributeMap() {
if (superEntityName == null) {
return (SortedMap) super.getAttributeMap();
}
SortedMap attributeMap = new TreeMap();
appendAttributes(attributeMap);
return attributeMap;
}
/**
* Recursively appends all attributes in the entity inheritance hierarchy.
*/
final void appendAttributes(Map map) {
map.putAll((Map) super.getAttributeMap());
ObjEntity superEntity = getSuperEntity();
if (superEntity != null) {
SortedMap attributeMap = new TreeMap();
superEntity.appendAttributes(attributeMap);
for (String attributeName : attributeMap.keySet()) {
String overridedDbPath = attributeOverrides.get(attributeName);
ObjAttribute attribute = new ObjAttribute(attributeMap.get(attributeName));
attribute.setEntity(this);
if (overridedDbPath != null) {
attribute.setDbAttributePath(overridedDbPath);
}
map.put(attributeName, attribute);
}
}
}
/**
* @since 3.0
*/
public void addAttributeOverride(String attributeName, String dbPath) {
attributeOverrides.put(attributeName, dbPath);
}
/**
* @since 3.0
*/
public Map getDeclaredAttributeOverrides() {
return Collections.unmodifiableMap(attributeOverrides);
}
/**
* Returns a Collection of all attributes that either belong to this ObjEntity or
* inherited.
*/
@Override
public Collection getAttributes() {
if (superEntityName == null) {
return (Collection) super.getAttributes();
}
return getAttributeMap().values();
}
/**
* Returns a Collection of all attributes that belong to this ObjEntity, excluding
* inherited attributes.
*
* @since 1.1
*/
public Collection getDeclaredAttributes() {
return (Collection) super.getAttributes();
}
/**
* Returns a named Relationship that either belongs to this ObjEntity or is inherited.
* Returns null if no matching attribute is found.
*/
@Override
public Relationship getRelationship(String name) {
ObjRelationship relationship = (ObjRelationship) super.getRelationship(name);
if (relationship != null) {
return relationship;
}
if (superEntityName == null) {
return null;
}
ObjEntity superEntity = getSuperEntity();
return (superEntity != null) ? superEntity.getRelationship(name) : null;
}
@Override
public SortedMap getRelationshipMap() {
if (superEntityName == null) {
return (SortedMap) super.getRelationshipMap();
}
SortedMap relationshipMap = new TreeMap();
appendRelationships(relationshipMap);
return relationshipMap;
}
/**
* Recursively appends all relationships in the entity inheritance hierarchy.
*/
final void appendRelationships(Map map) {
map.putAll((Map) super.getRelationshipMap());
ObjEntity superEntity = getSuperEntity();
if (superEntity != null) {
superEntity.appendRelationships(map);
}
}
@Override
public Collection getRelationships() {
if (superEntityName == null) {
return (Collection) super.getRelationships();
}
return getRelationshipMap().values();
}
/**
* Returns a Collection of all relationships that belong to this ObjEntity, excluding
* inherited attributes.
*
* @since 1.1
*/
public Collection getDeclaredRelationships() {
return (Collection) super.getRelationships();
}
/**
* Returns ObjAttribute of this entity that maps to dbAttribute
* parameter. Returns null if no such attribute is found.
*/
public ObjAttribute getAttributeForDbAttribute(DbAttribute dbAttribute) {
for (Attribute next : getAttributeMap().values()) {
if (next instanceof EmbeddedAttribute) {
ObjAttribute embeddedAttribute = ((EmbeddedAttribute) next)
.getAttributeForDbPath(dbAttribute.getName());
if (embeddedAttribute != null) {
return embeddedAttribute;
}
}
else {
ObjAttribute objAttr = (ObjAttribute) next;
if (objAttr.getDbAttribute() == dbAttribute) {
return objAttr;
}
}
}
return null;
}
/**
* Returns the names of DbAtributes that comprise the primary key of the parent
* DbEntity.
*
* @since 3.0
*/
public Collection getPrimaryKeyNames() {
DbEntity dbEntity = getDbEntity();
// abstract entities may have no DbEntity mapping
if (dbEntity == null) {
return Collections.emptyList();
}
Collection pkAttributes = dbEntity.getPrimaryKeys();
Collection names = new ArrayList(pkAttributes.size());
for (DbAttribute pk : pkAttributes) {
names.add(pk.getName());
}
return Collections.unmodifiableCollection(names);
}
/**
* Returns ObjRelationship of this entity that maps to dbRelationship
* parameter. Returns null if no such relationship is found.
*/
public ObjRelationship getRelationshipForDbRelationship(DbRelationship dbRelationship) {
for (ObjRelationship objRel : getRelationshipMap().values()) {
List relList = objRel.getDbRelationships();
if (relList.size() != 1) {
continue;
}
if (relList.get(0) == dbRelationship) {
return objRel;
}
}
return null;
}
/**
* Clears all the mapping between this obj entity and its current db entity. Clears
* mapping between entities, attributes and relationships.
*/
public void clearDbMapping() {
if (dbEntityName == null)
return;
for (Attribute attribute : getAttributeMap().values()) {
ObjAttribute objAttr = (ObjAttribute) attribute;
DbAttribute dbAttr = objAttr.getDbAttribute();
if (null != dbAttr) {
objAttr.setDbAttributePath(null);
}
}
for (Relationship relationship : this.getRelationships()) {
((ObjRelationship) relationship).clearDbRelationships();
}
dbEntityName = null;
}
/**
* Returns true if this ObjEntity represents a set of read-only objects.
*
* @return boolean
*/
public boolean isReadOnly() {
return readOnly;
}
public void setReadOnly(boolean readOnly) {
this.readOnly = readOnly;
}
/**
* Returns true if this entity directly or indirectly inherits from a given entity,
* false otherwise.
*
* @since 1.1
*/
public boolean isSubentityOf(ObjEntity entity) {
if (entity == null) {
return false;
}
if (entity == this) {
return false;
}
ObjEntity superEntity = getSuperEntity();
if (superEntity == entity) {
return true;
}
return (superEntity != null) ? superEntity.isSubentityOf(entity) : false;
}
/**
* @since 3.0
*/
@Override
@SuppressWarnings("unchecked")
public PathComponent lastPathComponent(
Expression path,
Map aliasMap) {
return super.lastPathComponent(path, aliasMap);
}
/**
* Returns an Iterable instance over expression path components based on this entity.
*
* @since 3.0
*/
@Override
@SuppressWarnings("unchecked")
public Iterable> resolvePath(
final Expression pathExp,
final Map aliasMap) {
if (pathExp.getType() == Expression.OBJ_PATH) {
return new Iterable>() {
public Iterator iterator() {
return new PathComponentIterator(ObjEntity.this, (String) pathExp
.getOperand(0), aliasMap);
}
};
}
throw new ExpressionException("Invalid expression type: '"
+ pathExp.expName()
+ "', OBJ_PATH is expected.");
}
@Override
public Iterator resolvePathComponents(Expression pathExp)
throws ExpressionException {
// resolve DB_PATH if we can
if (pathExp.getType() == Expression.DB_PATH) {
if (getDbEntity() == null) {
throw new ExpressionException("Can't resolve DB_PATH '"
+ pathExp
+ "', DbEntity is not set.");
}
return getDbEntity().resolvePathComponents(pathExp);
}
if (pathExp.getType() == Expression.OBJ_PATH) {
return new PathIterator((String) pathExp.getOperand(0));
}
throw new ExpressionException("Invalid expression type: '"
+ pathExp.expName()
+ "', OBJ_PATH is expected.");
}
/**
* Transforms an Expression to an analogous expression in terms of the underlying
* DbEntity.
*
* @since 1.1
*/
public Expression translateToDbPath(Expression expression) {
if (expression == null) {
return null;
}
if (getDbEntity() == null) {
throw new CayenneRuntimeException(
"Can't translate expression to DB_PATH, no DbEntity for '"
+ getName()
+ "'.");
}
// converts all OBJ_PATH expressions to DB_PATH expressions
// and pass control to the DB entity
return expression.transform(new DBPathConverter());
}
/**
* Transforms an Expression rooted in this entity to an analogous expression rooted in
* related entity.
*
* @since 1.1
*/
@Override
public Expression translateToRelatedEntity(
Expression expression,
String relationshipPath) {
if (expression == null) {
return null;
}
if (relationshipPath == null) {
return expression;
}
if (getDbEntity() == null) {
throw new CayenneRuntimeException(
"Can't transform expression, no DbEntity for '" + getName() + "'.");
}
// converts all OBJ_PATH expressions to DB_PATH expressions
// and pass control to the DB entity
DBPathConverter transformer = new DBPathConverter();
String dbPath = transformer.toDbPath(createPathIterator(relationshipPath));
Expression dbClone = expression.transform(transformer);
return getDbEntity().translateToRelatedEntity(dbClone, dbPath);
}
private PathComponentIterator createPathIterator(String path) {
return new PathComponentIterator(ObjEntity.this, path,
new HashMap()); //TODO: do we need aliases here?
}
final class DBPathConverter implements Transformer {
// TODO: make it a public method - resolveDBPathComponents or something...
// seems generally useful
String toDbPath(PathComponentIterator objectPathComponents) {
StringBuilder buf = new StringBuilder();
while (objectPathComponents.hasNext()) {
PathComponent component = objectPathComponents.next();
Iterator dbSubpath;
if (component.getAttribute() != null) {
dbSubpath = ((ObjAttribute) component.getAttribute()).getDbPathIterator();
}
else if (component.getRelationship() != null) {
dbSubpath = ((ObjRelationship) component.getRelationship())
.getDbRelationships()
.iterator();
}
else {
throw new CayenneRuntimeException("Unknown path component: "
+ component);
}
while (dbSubpath.hasNext()) {
CayenneMapEntry subComponent = (CayenneMapEntry) dbSubpath.next();
if (buf.length() > 0) {
buf.append(Entity.PATH_SEPARATOR);
}
buf.append(subComponent.getName());
// use OUTER join for all components of the path is Obj path is OUTER
if (component.getJoinType() == JoinType.LEFT_OUTER) {
buf.append(OUTER_JOIN_INDICATOR);
}
}
}
return buf.toString();
}
public Object transform(Object input) {
if (!(input instanceof Expression)) {
return input;
}
Expression expression = (Expression) input;
if (expression.getType() != Expression.OBJ_PATH) {
return input;
}
// convert obj_path to db_path
String converted = toDbPath(createPathIterator((String) expression.getOperand(0)));
Expression exp = ExpressionFactory.expressionOfType(Expression.DB_PATH);
exp.setOperand(0, converted);
return exp;
}
}
/**
* Returns the name of the underlying DbEntity.
*
* @since 1.1
*/
public String getDbEntityName() {
return dbEntityName;
}
/**
* Sets the name of underlying DbEntity.
*
* @since 1.1
*/
public void setDbEntityName(String string) {
dbEntityName = string;
}
/**
* ObjEntity property changed. May be name, attribute or relationship added or
* removed, etc. Attribute and relationship property changes are handled in respective
* listeners.
*
* @since 1.2
*/
public void objEntityChanged(EntityEvent e) {
if ((e == null) || (e.getEntity() != this)) {
// not our concern
return;
}
// handle entity name changes
if (e.getId() == EntityEvent.CHANGE && e.isNameChange()) {
String oldName = e.getOldName();
String newName = e.getNewName();
DataMap map = getDataMap();
if (map != null) {
ObjEntity oe = (ObjEntity) e.getEntity();
for (Relationship relationship : oe.getRelationships()) {
relationship = ((ObjRelationship) relationship)
.getReverseRelationship();
if (null != relationship
&& relationship.targetEntityName.equals(oldName)) {
relationship.targetEntityName = newName;
}
}
}
}
}
/** New entity has been created/added. */
public void objEntityAdded(EntityEvent e) {
// does nothing currently
}
/** Entity has been removed. */
public void objEntityRemoved(EntityEvent e) {
// does nothing currently
}
/**
* Returns true if the default lifecycle listeners should not be notified of this
* entity lifecycle events.
*
* @since 3.0
*/
public boolean isExcludingDefaultListeners() {
return excludingDefaultListeners;
}
public void setExcludingDefaultListeners(boolean excludingDefaultListeners) {
this.excludingDefaultListeners = excludingDefaultListeners;
}
/**
* Returns true if the lifeycle listeners defined on the superclasses should not be
* notified of this entity lifecycle events.
*
* @since 3.0
*/
public boolean isExcludingSuperclassListeners() {
return excludingSuperclassListeners;
}
public void setExcludingSuperclassListeners(boolean excludingSuperclassListeners) {
this.excludingSuperclassListeners = excludingSuperclassListeners;
}
}
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