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/*
* Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0, which is available at
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the
* Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
* version 2 with the GNU Classpath Exception, which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
*/
/*
* RuntimeModel.java
*
* Created on March 10, 2000, 11:05 AM
*/
package com.sun.jdo.api.persistence.model;
import com.sun.jdo.api.persistence.model.mapping.MappingClassElement;
import com.sun.jdo.spi.persistence.utility.JavaTypeHelper;
import com.sun.jdo.spi.persistence.utility.StringHelper;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.net.URL;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import org.glassfish.persistence.common.I18NHelper;
import org.netbeans.modules.dbschema.SchemaElement;
/**
*
* @author raccah
* @version %I%
*/
public class RuntimeModel extends Model
{
/** Extension of the class file, used to figure out the path for handling
* the mapping file.
*/
private static final String CLASS_EXTENSION = "class"; // NOI18N
/** Constant which represents the prefix of the java package.
*/
private static final String JAVA_PACKAGE = "java."; // NOI18N
/** Constant which represents the serializable interface.
*/
private static final String SERIALIZABLE = "java.io.Serializable"; //NOI18N
/** Map of class loader used to find classes and mapping information. Keys
* are fully qualified class names.
*/
private HashMap classLoaders = new HashMap();
/** Creates a new RuntimeModel. This constructor should not be called
* directly; instead, the static instance accesible from the Model class
* should be used.
* @see Model#RUNTIME
*/
protected RuntimeModel ()
{
super();
}
/** Determines if the specified className represents an interface type.
* @param className the fully qualified name of the class to be checked
* @return true if this class name represents an interface;
* false otherwise.
*/
public boolean isInterface (String className)
{
Class classElement = (Class)getClass(className);
return ((classElement != null) ? classElement.isInterface() : false);
}
/** Returns the input stream with the supplied resource name found with
* the supplied class name.
* NOTE, this implementation assumes the specified class loader is not null
* and needs not to be validated. Any validation is done by getMappingClass
* which is the only caller of this method.
* @param className the fully qualified name of the class which will
* be used as a base to find the resource
* @param classLoader the class loader used to find mapping information
* @param resourceName the name of the resource to be found
* @return the input stream for the specified resource, null
* if an error occurs or none exists
*/
protected BufferedInputStream getInputStreamForResource (String className,
ClassLoader classLoader, String resourceName)
{
InputStream is = ((className != null) ?
classLoader.getResourceAsStream(resourceName) : null);
BufferedInputStream rc = null;
if (is != null && !(is instanceof BufferedInputStream)) {
rc = new BufferedInputStream(is);
} else {
rc = (BufferedInputStream)is;
}
return rc;
}
/** Computes the class name (without package) for the supplied
* class name.
* @param className the fully qualified name of the class
* @return the class name (without package) for the supplied
* class name
*/
private String getShortClassName (String className)
{
return JavaTypeHelper.getShortClassName(className);
}
/** Returns the name of the second to top (top excluding java.lang.Object)
* superclass for the given class name.
* @param className the fully qualified name of the class to be checked
* @return the top non-Object superclass for className,
* className if an error occurs or none exists
*/
protected String findPenultimateSuperclass (String className)
{
Class classElement = (Class)getClass(className);
Class objectClass = java.lang.Object.class;
Class testClass = null;
if (classElement == null)
return className;
while ((testClass = classElement.getSuperclass()) != null)
{
if (testClass.equals(objectClass))
break;
classElement = testClass;
}
return classElement.getName();
}
/** Returns the name of the superclass for the given class name.
* @param className the fully qualified name of the class to be checked
* @return the superclass for className, null if an error
* occurs or none exists
*/
protected String getSuperclass (String className)
{
Class classElement = (Class)getClass(className);
if (classElement != null)
classElement = classElement.getSuperclass();
return ((classElement != null) ? classElement.getName() : null);
}
/** Returns the MappingClassElement created for the specified class name.
* This method looks up the class in the internal cache. If not present
* it loads the corresponding xml file containing the mapping information.
* @param className the fully qualified name of the mapping class
* @param classLoader the class loader used to find mapping information
* @return the MappingClassElement for className,
* null if an error occurs or none exists
* @see com.sun.jdo.api.persistence.model.mapping.impl.MappingClassElementImpl#forName(String, Model)
*/
public MappingClassElement getMappingClass (String className,
ClassLoader classLoader)
{
MappingClassElement mappingClass = null;
// First check class loader. This has to be done before the super call!
// Method Model.getMappingClass will check the MappingClassElement cache
// and will find an entry in the case of a multiple class loader for the
// same class name. So we have to check the multiple class loader first.
classLoader = findClassLoader(className, classLoader);
mappingClass = super.getMappingClass(className, classLoader);
if ((mappingClass != null) && (classLoader != null))
{
// Lookup the SchemElement connected to mappingClass. This reads
// the .dbschema file using the specified classLoader and stores the
// SchemaElement in the SchemaElement cache. Any subsequent
// SchemaElement.forName or TableElement.forName lookups will use
// the cached version.
String databaseRoot = mappingClass.getDatabaseRoot();
// An unmapped mapping class is allowed in which case the
// databaseRoot will be null (never mapped) or empty
// (mapped once, unmapped now), but if the databaseRoot is
// not null or empty and we can't find the schema, throw a
// RuntimeException to notify the user that something is wrong.
if (!StringHelper.isEmpty(databaseRoot) &&
(SchemaElement.forName(databaseRoot, classLoader) == null))
{
throw new RuntimeException(I18NHelper.getMessage(
getMessages(), "dbschema.not_found", // NOI18N
databaseRoot, className));
}
}
return mappingClass;
}
/** Returns an unmodifiable copy of the ClassLoader cache.
* @return unmodifiable ClassLoader cache
*/
public Map getClassLoaderCache ()
{
return Collections.unmodifiableMap(classLoaders);
}
/** Removes the classes cached with the specified class loader from all
* caches. The method iterates the ClassLoader cache to find classes
* cached with the specified class loader. These classes are removed
* from the ClassLoader cache, the cache of MappingClassElements and
* the set of classes known to be non PC. The associated SchemaElements
* are removed from the SchemaElement cache.
* @param classLoader used to determine the classes to be removed
*/
public void removeResourcesFromCaches (ClassLoader classLoader)
{
Collection classNames = new HashSet();
synchronized(classLoaders)
{
for (Iterator i = classLoaders.entrySet().iterator(); i.hasNext();)
{
Map.Entry next = (Map.Entry)i.next();
// check the cached class loader
if (next.getValue() == classLoader)
{
// add className to the collection of classNames to be
// removed
classNames.add(next.getKey());
// remove this entry from the classLoaders cache
i.remove();
}
}
}
removeResourcesFromCaches(classNames);
}
/** Creates a file with the given base file name and extension
* parallel to the supplied class (if it does not yet exist).
* @param className the fully qualified name of the class
* @param baseFileName the name of the base file
* @param extension the file extension
* @return the output stream for the specified resource, null
* if an error occurs or none exists
* @exception IOException if there is some error creating the file
*/
protected BufferedOutputStream createFile (String className, String baseFileName,
String extension) throws IOException
{
char extensionCharacter = '.';
File file = getFile(className,
baseFileName + extensionCharacter + extension);
if (file == null)
{
Class classElement = (Class)getClass(className);
if (classElement != null)
{
// need to find the path before the package name
String path = classElement.getResource(
getShortClassName(className) + extensionCharacter +
CLASS_EXTENSION).getFile();
int index = path.lastIndexOf(extensionCharacter) + 1;
file = new File(path.substring(0, index) + extension);
file.createNewFile();
}
}
return ((file != null)
? (new BufferedOutputStream(new FileOutputStream(file)))
: null);
}
/** Deletes the file with the given file name which is parallel
* to the supplied class.
* @param className the fully qualified name of the class
* @param fileName the name of the file
* @exception IOException if there is some error deleting the file
*/
protected void deleteFile (String className, String fileName)
throws IOException
{
File file = getFile(className, fileName);
if ((file != null) && file.exists())
file.delete();
}
/** Returns a file with the given file name which is parallel to the
* supplied class.
* @param className the fully qualified name of the class
* @param fileName the name of the file
* @return the file object for the specified resource, null
* if an error occurs
* @exception IOException if there is some error getting the file
*/
protected File getFile (String className, String fileName)
throws IOException
{
Class classElement = (Class)getClass(className);
if (classElement != null)
{
// need to find the path before the package name
URL path = classElement.getResource(fileName.substring(
fileName.lastIndexOf(getShortClassName(className))));
return ((path != null) ? (new File(path.getFile())) : null);
}
return null;
}
/** Returns the class element with the specified className. The class is
* found using Class.forName.
* @param className the fully qualified name of the class to be checked
* @param classLoader the class loader used to find mapping information
* @return the class element for the specified className, null
* if an error occurs or none exists
*/
public Object getClass (String className, ClassLoader classLoader)
{
if (className == null)
return null;
try
{
classLoader = findClassLoader(className, classLoader);
return Class.forName(className, true, classLoader);
}
catch (ClassNotFoundException e)
{
return null;
}
}
/**
* This method returns the class loader used to find mapping information
* for the specified className. If the classLoader argument is not null,
* the method updates the classLoaders cache and returns the specified
* classLoader. Otherwise it checks the cache for the specified className
* and returns this class loader. If there is no cached class loader it
* returns the current class loader.
* @param className the fully qualified name of the class to be checked
* @param classLoader the class loader used to find mapping information
* @return the class loader used to find mapping information for the
* specified className
* @exception IllegalArgumentException if there is class loader problem
*/
protected ClassLoader findClassLoader (String className,
ClassLoader classLoader) throws IllegalArgumentException
{
ClassLoader cached = null;
if (className == null)
return null;
else if (className.startsWith(JAVA_PACKAGE) || isPrimitive(className))
// Use current class loader for java packages or primitive types
// - these classes cannot have the multiple class loader conflict
// - these classes should not show up in the classLoaders map
return getClass().getClassLoader();
synchronized (classLoaders)
{
cached = (ClassLoader)classLoaders.get(className);
if (classLoader == null)
{
// Case 1: specified class loader is null =>
// return cached class loader if available, if not
// take current class loader
classLoader =
(cached != null) ? cached : getClass().getClassLoader();
}
else if (cached == null)
{
// Case 2: specified class loader is NOT null AND
// no class loader cached for the class name =>
// put specified class loader in cache
classLoaders.put(className, classLoader);
}
else if (classLoader != cached)
{
// Case 3: specified class loader is NOT null AND
// cache contains class loader for this class name AND
// both class loaders are not identical =>
// pontential conflict
Class clazz = null;
Class cachedClazz = null;
try
{
String prop = ClassLoaderStrategy.getStrategy();
// Load the class using specified and cached class loader.
// NOTE, do not change the order of the next two lines, the
// catch block relies on it!
clazz = Class.forName(className, true, classLoader);
cachedClazz = Class.forName(className, true, cached);
if (clazz.getClassLoader() == cachedClazz.getClassLoader())
{
// Case 3a: both class loaders are the same =>
// return it
return cached;
}
else if (ClassLoaderStrategy.MULTIPLE_CLASS_LOADERS_IGNORE.equals(prop))
{
// Case 3b: both class loaders are different and
// the system property is defined as ignore =>
// ignore the specified class loader and return
// the cached class loader
return cached;
}
else if (ClassLoaderStrategy.MULTIPLE_CLASS_LOADERS_RELOAD.equals(prop))
{
// Case 3c: both class loaders are different and
// the system property is defined as reload =>
// discard the cached class loader and replace it
// by the specified class loader
removeResourcesFromCaches(cachedClazz.getClassLoader());
classLoaders.put(className, classLoader);
return classLoader;
}
else
{
// Case 3d: both class loaders are different and
// the system property is defined as error or
// any other value =>
// throw exception
throw new IllegalArgumentException(I18NHelper.getMessage(
getMessages(), "classloader.multiple", // NOI18N
className));
}
}
catch (ClassNotFoundException ex)
{
// At least one of the class loader could not find the class.
// Update the classLoader map, if the specified class loader
// could find it, but the cached could not.
if ((clazz != null) && (cachedClazz == null))
classLoaders.put(className, classLoader);
}
}
}
return classLoader;
}
/** Determines if the specified class implements the specified interface.
* Note, class element is a model specific class representation as returned
* by a getClass call executed on the same model instance. This
* implementation expects the class element being a reflection instance.
* @param classElement the class element to be checked
* @param interfaceName the fully qualified name of the interface to
* be checked
* @return true if the class implements the interface;
* false otherwise.
* @see #getClass
*/
public boolean implementsInterface (Object classElement,
String interfaceName)
{
Class interfaceClass = (Class)getClass(interfaceName);
if ((classElement == null) || !(classElement instanceof Class) ||
(interfaceClass == null))
return false;
return interfaceClass.isAssignableFrom((Class)classElement);
}
/** Determines if the class with the specified name declares a constructor.
* @param className the name of the class to be checked
* @return true if the class declares a constructor;
* false otherwise.
* @see #getClass
*/
public boolean hasConstructor (final String className)
{
final Class classElement = (Class)getClass(className);
if (classElement != null)
{
Boolean b = (Boolean)AccessController.doPrivileged(
new PrivilegedAction()
{
public Object run ()
{
return JavaTypeHelper.valueOf(((Class)classElement).
getDeclaredConstructors().length != 0);
}
});
return b.booleanValue();
}
return false;
}
/** Returns the constructor element for the specified argument types
* in the class with the specified name. Types are specified as type
* names for primitive type such as int, float or as fully qualified
* class names.
* @param className the name of the class which contains the constructor
* to be checked
* @param argTypeNames the fully qualified names of the argument types
* @return the constructor element
* @see #getClass
*/
public Object getConstructor (final String className, String[] argTypeNames)
{
final Class classElement = (Class)getClass(className);
if (classElement != null)
{
final Class[] argTypes = getTypesForNames(argTypeNames);
return AccessController.doPrivileged(new PrivilegedAction()
{
public Object run ()
{
try
{
return ((Class)classElement).getDeclaredConstructor(
argTypes);
}
catch (NoSuchMethodException ex)
{
// constructor not found => return null
return null;
}
}
});
}
return null;
}
/** Returns the method element for the specified method name and argument
* types in the class with the specified name. Types are specified as
* type names for primitive type such as int, float or as fully qualified
* class names. Note, the method does not return inherited methods.
* @param className the name of the class which contains the method
* to be checked
* @param methodName the name of the method to be checked
* @param argTypeNames the fully qualified names of the argument types
* @return the method element
* @see #getClass
*/
public Object getMethod (final String className, final String methodName,
String[] argTypeNames)
{
final Class classElement = (Class)getClass(className);
if (classElement != null)
{
final Class[] argTypes = getTypesForNames(argTypeNames);
return AccessController.doPrivileged(new PrivilegedAction()
{
public Object run ()
{
try
{
return classElement.getDeclaredMethod(
methodName, argTypes);
}
catch (NoSuchMethodException ex)
{
// method not found => return null
return null;
}
}
});
}
return null;
}
/** Returns the string representation of type of the specified element.
* If element denotes a field, it returns the type of the field.
* If element denotes a method, it returns the return type of the method.
* Note, element is either a field element as returned by getField, or a
* method element as returned by getMethod executed on the same model
* instance. This implementation expects the element being a reflection
* instance.
* @param element the element to be checked
* @return the string representation of the type of the element
* @see #getField
* @see #getMethod
*/
public String getType (Object element)
{
return getNameForType(getTypeObject(element));
}
/** Returns a list of names of all the declared field elements in the
* class with the specified name.
* @param className the fully qualified name of the class to be checked
* @return the names of the field elements for the specified class
*/
public List getFields (String className)
{
List returnList = new ArrayList();
final Class classElement = (Class)getClass(className);
if (classElement != null)
{
Field[] fields = (Field[]) AccessController.doPrivileged(
new PrivilegedAction()
{
public Object run ()
{
return classElement.getDeclaredFields();
}
});
int i, count = fields.length;
for (i = 0; i < count; i++)
returnList.add(fields[i].getName());
}
return returnList;
}
/** Returns the field element for the specified fieldName in the class
* with the specified className.
* @param className the fully qualified name of the class which contains
* the field to be checked
* @param fieldName the name of the field to be checked
* @return the field element for the specified fieldName
*/
public Object getField (String className, final String fieldName)
{
final Class classElement = (Class)getClass(className);
if (classElement != null)
{
return AccessController.doPrivileged(new PrivilegedAction()
{
public Object run ()
{
try
{
return classElement.getDeclaredField(fieldName);
}
catch (NoSuchFieldException e)
{
// field not found => return null;
return null;
}
}
});
}
return null;
}
/** Determines if the specified field element has a serializable type.
* A type is serializable if it is a primitive type, a class that implements
* java.io.Serializable or an interface that inherits from
* java.io.Serializable.
* Note, the field element is a model specific field representation as
* returned by a getField call executed on the same model instance. This
* implementation expects the field element being a reflection instance.
* @param fieldElement the field element to be checked
* @return true if the field element has a serializable type;
* false otherwise.
* @see #getField
*/
public boolean isSerializable (Object fieldElement)
{
Class type = getTypeObject(fieldElement);
// check if the topmost element type is serializable
while ((type != null) && type.isArray())
type = type.getComponentType();
return ((type != null) ?
(type.isPrimitive() || implementsInterface(type, SERIALIZABLE)) :
false);
}
/** Determines if a field with the specified fieldName in the class
* with the specified className is an array.
* @param className the fully qualified name of the class which contains
* the field to be checked
* @param fieldName the name of the field to be checked
* @return true if this field name represents a java array
* field; false otherwise.
* @see #getFieldType
*/
public boolean isArray (String className, String fieldName)
{
Object fieldElement = getField(className, fieldName);
return ((fieldElement != null) ?
getTypeObject(fieldElement).isArray() : false);
}
/** Returns the string representation of declaring class of
* the specified member element. Note, the member element is
* either a class element as returned by getClass, a field element
* as returned by getField, a constructor element as returned by
* getConstructor, or a method element as returned by getMethod
* executed on the same model instance. This implementation
* expects the member element to be a reflection instance.
* @param memberElement the member element to be checked
* @return the string representation of the declaring class of
* the specified memberElement
* @see #getClass
* @see #getField
* @see #getConstructor
* @see #getMethod
*/
public String getDeclaringClass (Object memberElement)
{
Class classElement = null;
if ((memberElement != null) && (memberElement instanceof Member))
classElement = ((Member)memberElement).getDeclaringClass();
return ((classElement != null) ? classElement.getName() : null);
}
/** Returns the modifier mask for the specified member element.
* Note, the member element is either a class element as returned by
* getClass, a field element as returned by getField, a constructor element
* as returned by getConstructor, or a method element as returned by
* getMethod executed on the same model instance. This implementation
* expects the member element to be a reflection instance.
* @param memberElement the member element to be checked
* @return the modifier mask for the specified memberElement
* @see java.lang.reflect.Modifier
* @see #getClass
* @see #getField
* @see #getConstructor
* @see #getMethod
*/
public int getModifiers (Object memberElement)
{
int modifiers = 0;
if (memberElement != null)
{
if (memberElement instanceof Class)
{
modifiers = ((Class)memberElement).getModifiers();
}
else if (memberElement instanceof Member)
{
modifiers = ((Member)memberElement).getModifiers();
}
}
return modifiers;
}
/** Returns the Class type of the specified element.
* If element denotes a field, it returns the type of the field.
* If element denotes a method, it returns the return type of the method.
* Note, element is either a field element as returned by getField, or a
* method element as returned by getMethod executed on the same model
* instance.
* @param element the element to be checked
* @return the Class type of the element
* @see #getField
* @see #getMethod
*/
protected Class getTypeObject (Object element)
{
Class type = null;
if (element != null)
{
if (element instanceof Field)
type = ((Field)element).getType();
else if (element instanceof Method)
type = ((Method)element).getReturnType();
}
return type;
}
private String getNameForType (Class type)
{
String typeName = null;
if (type != null)
{
if (type.isArray())
{
typeName = getNameForType(
type.getComponentType()) + "[]"; // NOI18N
}
else
typeName = type.getName();
}
return typeName;
}
/** Converts the array of type names into an array of Class objects.
*/
private Class[] getTypesForNames (String[] typeNames)
{
Class[] classes = new Class[typeNames.length];
for (int i = 0; i < classes.length; i++)
classes[i] = getTypeForName(typeNames[i]);
return classes;
}
/** Converts the specified type name into its corresponding java.lang.Class
* representation.
*/
private Class getTypeForName (String typeName)
{
Class clazz = JavaTypeHelper.getPrimitiveClass(typeName);
if (clazz == null)
clazz = (Class)getClass(typeName);
return clazz;
}
}
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