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/*
* MappingGenerator.java
*
* Created on Aug 18, 2003
*/
package com.sun.jdo.api.persistence.mapping.ejb;
import java.util.*;
import java.sql.Types;
import java.io.IOException;
import com.sun.jdo.api.persistence.mapping.ejb.beans.*;
import com.sun.jdo.api.persistence.model.Model;
import com.sun.jdo.api.persistence.model.ModelException;
import com.sun.jdo.api.persistence.model.mapping.MappingClassElement;
import com.sun.jdo.api.persistence.model.mapping.MappingFieldElement;
import com.sun.jdo.api.persistence.model.jdo.PersistenceClassElement;
import com.sun.jdo.api.persistence.model.jdo.PersistenceFieldElement;
import com.sun.jdo.spi.persistence.utility.StringHelper;
import com.sun.jdo.spi.persistence.utility.JavaTypeHelper;
import com.sun.jdo.spi.persistence.generator.database.DatabaseGenerator;
import com.sun.jdo.spi.persistence.generator.database.MappingPolicy;
import org.netbeans.modules.dbschema.*;
import org.netbeans.modules.dbschema.jdbcimpl.SchemaElementImpl;
import org.netbeans.modules.dbschema.util.NameUtil;
import org.netbeans.modules.schema2beans.Schema2BeansException;
/*
* This class will generate mapping classes from sun-cmp-mappings.xml
* and dbschema if they are available in the jar, or it will generate mapping
* classes based on ejb-jar.xml, bean classes and policy by invoking the
* database generation backend.
*
* @author Jie Leng
*/
public class MappingGenerator {
// Since "_JDOState" is defined as private in IASEjbCMPEntityDescriptor,
// redefined here for passing it in DatabaseGenerator.
private static final String CLASS_SUFFIX = "_JDOState"; // NOI18N
private static final String FAKE_NAME = "fakename"; // NOI18N
private final EJBInfoHelper infoHelper;
private final Model model;
private final AbstractNameMapper nameMapper;
private final ClassLoader loader;
private final ConversionHelper ddHelper;
/** a boolean indicating whether the jdo model and mapping model should
* contain generated fields
*/
private boolean skipGeneratedFields = false;
//hold strong reference to mapping class elements
private List strongRefs = new ArrayList();
/**
* Constructor
* @param infoHelper an instance of an EJBInfoHelper
* @param model a model containing mapping class and
* persistence class information
* @param loader a class loader
* @param skipGeneratedFields a boolean indicating to remove generated
* fields from jdo model and mapping model
*/
public MappingGenerator(EJBInfoHelper infoHelper,
ClassLoader loader, boolean skipGeneratedFields) {
this.infoHelper = infoHelper;
this.model = infoHelper.getModel();
this.loader = loader;
this.nameMapper = infoHelper.getNameMapper();
this.ddHelper = infoHelper.createConversionHelper();
this.skipGeneratedFields = skipGeneratedFields;
}
protected EJBInfoHelper getInfoHelper() {
return infoHelper;
}
protected ClassLoader getClassLoader() {
return loader;
}
protected AbstractNameMapper getNameMapper() {
return nameMapper;
}
protected ConversionHelper getConversionHelper() {
return ddHelper;
}
/**
* Create mapping classes and schema based on database vendor name.
* @param dbName a string for database vendor name
* @param uniqueTableNames a string to determin if use unique table names
* during database generation
* @param userPolicy a property object holding user overrides
* @param inputFilesPath a directory where sun-cmp-mappings.xml is located
* @throws IOException
* @throws Schema2BeansException
* @throws ModelException
* @throws DBException
* @throws ConversionException
*/
public DatabaseGenerator.Results generateMappingClasses(String dbName,
String uniqueTableNames, Properties userPolicy,
String inputFilesPath)
throws IOException, Schema2BeansException, ModelException,
DBException, ConversionException {
// generate mapping classes and dbschema in memory
SunCmpMappings sunCmpMappings = null;
// sun-cmp-mappings.xml does not exist, use DatabaseGenerator
// to generate sun-cmp-mappings.xml, *.dbschema
List pcClasses = new ArrayList();
sunCmpMappings = getPartialSunCmpMappings(
pcClasses,
Boolean.valueOf(uniqueTableNames).booleanValue());
// load real jdo model and fake mapping model in memory
ddHelper.setEnsureValidation(false);
// create fake schema for partial mapping
SchemaElement fakeSchema = new SchemaElement(new SchemaElementImpl());
fakeSchema.setName(DBIdentifier.create(FAKE_NAME));
// add newly created fake schema to SchemaElement cache
SchemaElement.addToCache(fakeSchema);
// pass null as class loader in order for MappingFile to load schema
// from cache not from disk.
loadMappingClasses(sunCmpMappings, null);
DatabaseGenerator.Results results = generateSchema(pcClasses,
dbName, uniqueTableNames, userPolicy);
SchemaElement schema = results.getSchema();
Set mappingClasses = results.getMappingClasses();
// remove fake schema from cache since the correct schema is generated.
SchemaElement.removeFromCache(FAKE_NAME);
// clean up old version of schema in SchemaElement cache
// if there is one
SchemaElement.removeFromCache(schema.getName().getName());
// add newly created schema to SchemaElement cache
SchemaElement.addToCache(schema);
// update mapping classes
updateMappingClasses(mappingClasses);
// If skipGeneratedFields is set to true, the generated fields should
// not be kept in jdo model and mapping model.
// Remove generated fields from jdo model and mapping
// model before returning the result.
if (skipGeneratedFields) {
Iterator iter = mappingClasses.iterator();
while (iter.hasNext()) {
MappingClassElement mapClassElt = (MappingClassElement)iter.next();
if (mapClassElt != null) {
String className = mapClassElt.getName();
String ejbName = nameMapper.getEjbNameForPersistenceClass(
className);
PersistenceClassElement pce = (PersistenceClassElement)
model.getPersistenceClass(className);
PersistenceFieldElement[] allFields = pce.getFields();
if (allFields != null) {
List generatedFieldList = new ArrayList();
// In order to avoid concurrentmod exception,
// loop through all persistence fields to put generated
// fields in a list, loop though the list to remove
// the generated fields from the model.
for (int i = 0; i < allFields.length; i++) {
PersistenceFieldElement pfe = allFields[i];
if (pfe != null) {
String pFieldName = pfe.getName();
String ejbFieldName = nameMapper.
getEjbFieldForPersistenceField(className,
pFieldName);
if (nameMapper.isGeneratedField(ejbName,
ejbFieldName)) {
generatedFieldList.add(pfe);
}
}
}
// If the field is a version field, don't remove it
// from the model even though it is generated because
// it is needed to hold the version column information.
Iterator iterator = generatedFieldList.iterator();
while (iterator.hasNext()) {
PersistenceFieldElement pfe =
(PersistenceFieldElement)iterator.next();
MappingFieldElement mfe = mapClassElt.
getField(pfe.getName());
if (mfe != null && (!mfe.isVersion())) {
model.removeFieldElement(pfe);
mapClassElt.removeField(mfe);
}
}
}
}
}
}
return results;
}
/**
* load mapping classes from SunCmpMappings object
* @param sunMapping a SunCmpMappings object representing
* sun-cmp-mappings.xml in memory
* @param classLoader a class loader object
* @return a map object containing ejb names and mapping classes
* @throws DBException
* @throws ModelException
* @throws ConversionException
*/
protected Map loadMappingClasses(SunCmpMappings sunMapping,
ClassLoader classLoader)
throws DBException, ModelException, ConversionException {
MappingFile mapFile = new MappingFile(classLoader);
Map allMappings = mapFile.intoMappingClasses(sunMapping, ddHelper);
updateMappingClasses(allMappings.values());
return allMappings;
}
/**
* Clean up strong reference. It should be called by end of deployment
* or deploytool.
*/
public void cleanup() {
// Remove the strong references to MappingClassElements
// needed during deployment. The mapping class cache
// can now be cleaned up by the garbage collector.
strongRefs.clear();
}
/**
* Call DatabaseGenerator to generate database model and mapping model
* @param pcClasses a list of DatabaseGenerator.GeneratorNameTuple objects
* @param dbVendorName the string of database name
* @param useUniqueTableNames the string to determine use of unique table
* names for database generation
* @param userPolicy the property having user defined mappings between
* class field and jdbc type
* @return DatabaseGenerator.Results contains mapping classes and schema
* @throws IOException
* @throws DBException
* @throws ModelException
*/
private DatabaseGenerator.Results generateSchema(List pcClasses,
String dbName, String useUniqueTableNames,
Properties userPolicy)
throws IOException, DBException, ModelException {
MappingPolicy mappingPolicy = MappingPolicy.getMappingPolicy(dbName);
mappingPolicy.setUserPolicy(userPolicy);
if (isPropertyDefined(useUniqueTableNames)) {
// It was explicitly set.
mappingPolicy.setUniqueTableName(
Boolean.valueOf(useUniqueTableNames).booleanValue());
}
return DatabaseGenerator.generate(
model, pcClasses, mappingPolicy,
infoHelper.getSchemaNameToGenerate(), CLASS_SUFFIX, true);
}
/**
* Puts mapping classes into model's cache
* @param mappingClasses a collection of mapping classes
*/
private void updateMappingClasses(Collection mappingClasses) {
Iterator iter = mappingClasses.iterator();
while (iter.hasNext()) {
MappingClassElement mapClassElt = (MappingClassElement)iter.next();
//put it in the models' cache
model.updateKeyForClass(mapClassElt, null);
//keep a strong ref
strongRefs.add(mapClassElt);
}
}
/**
* Generates partial sun-cmp-mapping (contains fake table name and
* fake column name) for MappingFile.intoMappings()
* @param pcClasses a list of DatabaseGenerator.NameTuple objects
* @param useUniqueTableNames a boolean to determine whether to use
* unique table names during database generation
* @return a SunCmpMappings object
* @throws Schema2BeansException
*/
private SunCmpMappings getPartialSunCmpMappings(List pcClasses,
boolean useUniqueTableNames) throws Schema2BeansException {
// Create a new name mapper with perisistence class name differing
// from bean name if useUniqueTableName flag is true.
// So persistence class name can be used for unique table name.
AbstractNameMapper nameMapper2 = (useUniqueTableNames) ?
infoHelper.createUniqueNameMapper() : nameMapper;
SunCmpMappings mappings = null;
mappings = new SunCmpMappings();
SunCmpMapping mapping = new SunCmpMapping();
mapping.setSchema(FAKE_NAME);
Iterator iter = infoHelper.getEjbNames().iterator();
while (iter.hasNext()) {
String ejbName = (String)iter.next();
String pcClass = ddHelper.getMappedClassName(ejbName);
String hashClassName = JavaTypeHelper.getShortClassName(pcClass);
// Make sure hash class name differs from ejb name
// if useUniqueTableName flag is true.
// if useUniqueTableName flag is false, ejb name is used for
// table name and hash class name is ignored.
if (useUniqueTableNames & hashClassName.equals(ejbName)) {
hashClassName = JavaTypeHelper.getShortClassName(
nameMapper2.getPersistenceClassForEjbName(ejbName));
pcClasses.add(new DatabaseGenerator.NameTuple(
pcClass, ejbName, hashClassName));
}
else {
pcClasses.add(new DatabaseGenerator.NameTuple(
pcClass, ejbName));
}
EntityMapping entity = new EntityMapping();
entity.setEjbName(ejbName);
entity.setTableName(FAKE_NAME);
Collection fields = infoHelper.getFieldsForEjb(ejbName);
Collection rels = infoHelper.getRelationshipsForEjb(ejbName);
fields.removeAll(rels);
// cmp field
Iterator fIter = fields.iterator();
while (fIter.hasNext()) {
String fieldName = (String)fIter.next();
CmpFieldMapping cmpField = new CmpFieldMapping();
cmpField.setFieldName(fieldName);
cmpField.addColumnName(FAKE_NAME);
entity.addCmpFieldMapping(cmpField);
}
// cmr field
fIter = rels.iterator();
while (fIter.hasNext()) {
String fieldName = (String)fIter.next();
CmrFieldMapping cmrField = new CmrFieldMapping();
cmrField.setCmrFieldName(fieldName);
ColumnPair columnPair = new ColumnPair();
columnPair.addColumnName(FAKE_NAME);
columnPair.addColumnName(FAKE_NAME);
cmrField.addColumnPair(columnPair);
entity.addCmrFieldMapping(cmrField);
}
mapping.addEntityMapping(entity);
}
mappings.addSunCmpMapping(mapping);
return mappings;
}
/**
* Returns <code>true</code> if the specified propertyValue represents
* a defined value, <code>false</code> otherwise. This implementation
* returns <code>true</code> if the value is not empty, but subclasses
* may override this method to compare to a constant which represents an
* undefined value.
* @param propertyValue the value to be tested for defined
* @return <code>true</code> if the specified propertyValue represents
* a defined value, <code>false</code> otherwise
*/
protected boolean isPropertyDefined(String propertyValue) {
return !StringHelper.isEmpty(propertyValue);
}
/**
* Update column in the SchemaElement with jdbc type and its length,
* scale and precision.
* @param column a ColumnElement to be updated
* @param jdbcType jdbc type from java.sql.Types
* @param length an Integer for length or <code>null</code>
* if it does not apply
* @param scale an Integer for scale or <code>null</code>
* if it does not apply
* @param precision an Integer for precision or <code>null</code>
* if it does not apply
*/
public static void updateColumn(ColumnElement column, int jdbcType,
Integer length, Integer scale, Integer precision)
throws DBException {
column.setType(jdbcType);
column.setLength(length);
column.setScale(scale);
column.setPrecision(precision);
}
/**
* This method updates properties which stores user override policy.
* @param prop the property for user override
* @param className a string for bean class
* @param fieldName a string for field
* @param jdbcType jdbc type from java.sql.Types
* @param length an Integer for length or <code>null</code>
* if it does not apply
* @param scale an Integer for scale or <code>null</code>
* if it does not apply
* @param precision an Integer for precision or <code>null</code>
* if it does not apply
*/
public static void updateProperties(Properties prop, String className,
String fieldName, int jdbcType, Integer length, Integer scale,
Integer precision) {
prop.setProperty(
MappingPolicy.getOverrideForType(className, fieldName),
MappingPolicy.getJdbcTypeName(jdbcType));
updateProperty(prop, MappingPolicy.getOverrideForLength(
className, fieldName), length);
updateProperty(prop, MappingPolicy.getOverrideForScale(
className, fieldName), scale);
updateProperty(prop, MappingPolicy.getOverrideForPrecision(
className, fieldName), precision);
}
/**
* This method updates property. If the value is not <code>null</code>,
* update the property. If the value is <code>null</code>,
* remove the property.
* @param prop a property object which needs to be updated
* @param key a key for the property
* @param value a value for the propety
*/
private static void updateProperty(Properties prop, String key,
Integer value) {
if (value != null) {
prop.setProperty(key, value.toString());
}
else {
prop.remove(key);
}
}
/**
* The contents of this class will eventually be added to SQLTypeUtil
* in dbmodel. It is an util class which provides methods for jdbc type
* compatible and jdbc attribute.
*/
public static class SQLTypeUtil {
private static final Map characterMap = new HashMap();
private static final Map numericMap = new HashMap();
private static final Map blobMap = new HashMap();
private static final Map timeMap = new HashMap();
private static final String NONE_ATTRIBUTE = "none";
private static final String LENGTH_ATTRIBUTE = "length";
private static final String SCALE_ATTRIBUTE = "scale";
private static final String SCALE_PRECISION_ATTRIBUTE = "scale-precision";
static {
characterMap.put(new Integer(Types.CHAR), LENGTH_ATTRIBUTE);
characterMap.put(new Integer(Types.VARCHAR), LENGTH_ATTRIBUTE);
characterMap.put(new Integer(Types.CLOB), LENGTH_ATTRIBUTE);
numericMap.put(new Integer(Types.BIT), NONE_ATTRIBUTE);
numericMap.put(new Integer(Types.TINYINT), NONE_ATTRIBUTE);
numericMap.put(new Integer(Types.SMALLINT), NONE_ATTRIBUTE);
numericMap.put(new Integer(Types.BIGINT), NONE_ATTRIBUTE);
numericMap.put(new Integer(Types.INTEGER), NONE_ATTRIBUTE);
numericMap.put(new Integer(Types.DOUBLE), NONE_ATTRIBUTE);
numericMap.put(new Integer(Types.DECIMAL), SCALE_PRECISION_ATTRIBUTE);
numericMap.put(new Integer(Types.REAL), NONE_ATTRIBUTE);
blobMap.put(new Integer(Types.BLOB), LENGTH_ATTRIBUTE);
timeMap.put(new Integer(Types.DATE), NONE_ATTRIBUTE);
timeMap.put(new Integer(Types.TIME), NONE_ATTRIBUTE);
timeMap.put(new Integer(Types.TIMESTAMP), NONE_ATTRIBUTE);
}
/** Returns if the given data type is numeric type or not.
* @param jdbcType the type from java.sql.Types
* @return <code>true</code> if the given type is numeric type;
* <code>false</code> otherwise
*/
public static boolean isNumeric (int jdbcType) {
return checkType(jdbcType, numericMap);
}
/** Returns if the given data type is character type or not.
* @param jdbcType the type from java.sql.Types
* @return <code>true</code> if the given type is character type;
* <code>false</code> otherwise
*/
public static boolean isCharacter (int jdbcType) {
return checkType(jdbcType, characterMap);
}
/** Returns if a given data type is blob type or not.
* @param jdbcType the type from java.sql.Types
* @return <code>true</code> if the give type is blob type;
* <code>false</code> otherwise
*/
public static boolean isBlob (int jdbcType) {
return checkType(jdbcType, blobMap);
}
/** Returns if a given data type is time type or not.
* @param jdbcType the type from java.sql.Types
* @return <code>true</code> if the give type is time type;
* <code>false</code> otherwise
*/
public static boolean isTime (int jdbcType) {
return checkType(jdbcType, timeMap);
}
private static boolean checkType(int jdbcType, Map jdbcTypes) {
return jdbcTypes.containsKey(new Integer(jdbcType));
}
/** Returns a collection of compatible jdbc types.
* @param jdbcType the type from java.sql.Types
* @return a collection of compatible jdbc types
*/
public static Collection getCompatibleTypes(int jdbcType) {
if (isNumeric(jdbcType)) {
return numericMap.keySet();
}
else if (isCharacter(jdbcType)) {
return characterMap.keySet();
}
else if (isBlob(jdbcType)) {
return blobMap.keySet();
}
else if (isTime(jdbcType)) {
return timeMap.keySet();
}
return null;
}
/**
* This method returns true if the jdbc type has scale.
* @param jdbcType a jdbc type from java.sql.Types
* @return <code>true</code> if the type has scale;
* <code>false</code> otherwise
*/
public static boolean hasScale(int jdbcType) {
if (getAttribute(jdbcType).equals(SCALE_ATTRIBUTE)
|| getAttribute(jdbcType).equals(SCALE_PRECISION_ATTRIBUTE))
return true;
return false;
}
/**
* This method returns true if the jdbc type has precision.
* If the jdbc type has the precision, it means it also has scale.
* @param jdbcType a jdbc type from java.sql.Types
* @return <code>true</code> if the type has precision;
* <code>false</code> otherwise
*/
public static boolean hasPrecision(int jdbcType) {
if (getAttribute(jdbcType).equals(SCALE_PRECISION_ATTRIBUTE))
return true;
return false;
}
/**
* This method returns true if the jdbc type has length
* @param jdbcType a jdbc type from java.sql.Types
* @return <code>true</code> if the type has length;
* <code>false</code> otherwise
*/
public static boolean hasLength(int jdbcType) {
if (getAttribute(jdbcType).equals(LENGTH_ATTRIBUTE))
return true;
return false;
}
private static String getAttribute(int jdbcType) {
if (isNumeric(jdbcType)) {
return (String)numericMap.get(new Integer(jdbcType));
}
else if (isCharacter(jdbcType)) {
return (String)characterMap.get(new Integer(jdbcType));
}
else if (isBlob(jdbcType)) {
return (String)blobMap.get(new Integer(jdbcType));
}
else if (isTime(jdbcType)) {
return (String)timeMap.get(new Integer(jdbcType));
}
return NONE_ATTRIBUTE;
}
}
}
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