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package oracle.toplink.essentials.mappings.converters;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import oracle.toplink.essentials.mappings.*;
import oracle.toplink.essentials.mappings.foundation.AbstractDirectMapping;
import oracle.toplink.essentials.sessions.*;
import oracle.toplink.essentials.exceptions.ConversionException;
import oracle.toplink.essentials.exceptions.ValidationException;
import oracle.toplink.essentials.internal.security.PrivilegedAccessHelper;
import oracle.toplink.essentials.internal.security.PrivilegedClassForName;
import oracle.toplink.essentials.internal.sessions.AbstractSession;
/**
* <b>Purpose</b>: Type conversion converters are used to explicitly map a database type to a
* Java type.
*
* @author James Sutherland
* @since OracleAS TopLink 10<i>g</i> (10.0.3)
*/
public class TypeConversionConverter implements Converter {
protected DatabaseMapping mapping;
/** Field type */
protected Class dataClass;
protected String dataClassName;
/** Object type */
protected Class objectClass;
protected String objectClassName;
/**
* PUBLIC:
* Default constructor.
*/
public TypeConversionConverter() {
}
/**
* PUBLIC:
* Default constructor.
*/
public TypeConversionConverter(DatabaseMapping mapping) {
this.mapping = mapping;
}
/**
* INTERNAL:
* Convert all the class-name-based settings in this converter to actual class-based
* settings. This method is used when converting a project that has been built
* with class names to a project with classes.
* This method is implemented by subclasses as necessary.
* @param classLoader
*/
public void convertClassNamesToClasses(ClassLoader classLoader){
Class dataClass = null;
Class objectClass = null;
try{
if (dataClassName != null){
if (PrivilegedAccessHelper.shouldUsePrivilegedAccess()){
try {
dataClass = (Class)AccessController.doPrivileged(new PrivilegedClassForName(dataClassName, true, classLoader));
} catch (PrivilegedActionException exception) {
throw ValidationException.classNotFoundWhileConvertingClassNames(dataClassName, exception.getException());
}
} else {
dataClass = oracle.toplink.essentials.internal.security.PrivilegedAccessHelper.getClassForName(dataClassName, true, classLoader);
}
setDataClass(dataClass);
}
} catch (ClassNotFoundException exc){
throw ValidationException.classNotFoundWhileConvertingClassNames(dataClassName, exc);
}
try {
if (objectClassName != null){
if (PrivilegedAccessHelper.shouldUsePrivilegedAccess()){
try {
objectClass = (Class)AccessController.doPrivileged(new PrivilegedClassForName(objectClassName, true, classLoader));
} catch (PrivilegedActionException exception) {
throw ValidationException.classNotFoundWhileConvertingClassNames(objectClassName, exception.getException());
}
} else {
objectClass = oracle.toplink.essentials.internal.security.PrivilegedAccessHelper.getClassForName(objectClassName, true, classLoader);
}
setObjectClass(objectClass);
}
} catch (ClassNotFoundException exc){
throw ValidationException.classNotFoundWhileConvertingClassNames(objectClassName, exc);
}
};
/**
* INTERNAL:
* The field value must first be converted to the field type, then the attribute type.
*/
public Object convertDataValueToObjectValue(Object fieldValue, Session session) {
Object attributeValue = fieldValue;
if (attributeValue != null) {
try {
attributeValue = ((AbstractSession)session).getDatasourcePlatform().convertObject(attributeValue, getDataClass());
} catch (ConversionException e) {
throw ConversionException.couldNotBeConverted(mapping, mapping.getDescriptor(), e);
}
try {
attributeValue = ((AbstractSession)session).getDatasourcePlatform().convertObject(attributeValue, getObjectClass());
} catch (ConversionException e) {
throw ConversionException.couldNotBeConverted(mapping, mapping.getDescriptor(), e);
}
}
return attributeValue;
}
/**
* PUBLIC:
* Returns the class type of the object value.
*/
public Class getObjectClass() {
return objectClass;
}
/**
* INTERNAL:
* Return the name of the object type for the MW usage.
*/
public String getObjectClassName() {
if ((objectClassName == null) && (objectClass != null)) {
objectClassName = objectClass.getName();
}
return objectClassName;
}
/**
* PUBLIC:
* Returns the class type of the data value.
*/
public Class getDataClass() {
return dataClass;
}
/**
* INTERNAL:
* Return the name of the data type for the MW usage.
*/
public String getDataClassName() {
if ((dataClassName == null) && (dataClass != null)) {
dataClassName = dataClass.getName();
}
return dataClassName;
}
/**
* PUBLIC:
* Set the class type of the data value.
*/
public void setDataClass(Class dataClass) {
this.dataClass = dataClass;
}
/**
* INTERNAL:
* Set the name of the data type for the MW usage.
*/
public void setDataClassName(String dataClassName) {
this.dataClassName = dataClassName;
}
/**
* PUBLIC:
* Set the class type of the object value.
*/
public void setObjectClass(Class objectClass) {
this.objectClass = objectClass;
}
/**
* INTERNAL:
* Set the name of the object type for the MW usage.
*/
public void setObjectClassName(String objectClassName) {
this.objectClassName = objectClassName;
}
/**
* INTERNAL:
* Convert to the field class.
*/
public Object convertObjectValueToDataValue(Object attributeValue, Session session) {
try {
return ((AbstractSession)session).getDatasourcePlatform().convertObject(attributeValue, getDataClass());
} catch (ConversionException e) {
throw ConversionException.couldNotBeConverted(mapping, mapping.getDescriptor(), e);
}
}
/**
* INTERNAL:
* Set the mapping.
*/
public void initialize(DatabaseMapping mapping, Session session) {
this.mapping = mapping;
// CR#... Mapping must also have the field classification.
if (getMapping().isDirectToFieldMapping()) {
AbstractDirectMapping directMapping = (AbstractDirectMapping)getMapping();
// Allow user to specify field type to override computed value. (i.e. blob, nchar)
if (directMapping.getFieldClassification() == null) {
directMapping.setFieldClassification(getDataClass());
}
// Set the object class from the attribute, if null.
if (getObjectClass() == null) {
setObjectClass(directMapping.getAttributeClassification());
}
}
}
/**
* INTERNAL:
* Return the mapping.
*/
protected DatabaseMapping getMapping() {
return mapping;
}
/**
* INTERNAL:
* If the converter converts the value to a non-atomic value, i.e.
* a value that can have its' parts changed without being replaced,
* then it must return false, serialization can be non-atomic.
*/
public boolean isMutable() {
return false;
}
}
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