/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file 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, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.harmony.javax.naming.spi;
import java.net.URL;
import java.net.URLClassLoader;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.StringTokenizer;
import org.apache.harmony.javax.naming.Binding;
import org.apache.harmony.javax.naming.CannotProceedException;
import org.apache.harmony.javax.naming.Context;
import org.apache.harmony.javax.naming.Name;
import org.apache.harmony.javax.naming.NameClassPair;
import org.apache.harmony.javax.naming.NameParser;
import org.apache.harmony.javax.naming.NamingEnumeration;
import org.apache.harmony.javax.naming.NamingException;
import org.apache.harmony.javax.naming.RefAddr;
import org.apache.harmony.javax.naming.Reference;
import org.apache.harmony.javax.naming.Referenceable;
import org.apache.harmony.javax.naming.StringRefAddr;
import org.apache.harmony.javax.naming.directory.Attributes;
import org.apache.harmony.javax.naming.directory.DirContext;
import org.apache.harmony.javax.naming.directory.ModificationItem;
import org.apache.harmony.javax.naming.directory.SearchControls;
import org.apache.harmony.javax.naming.directory.SearchResult;
import org.apache.harmony.javax.naming.spi.DirStateFactory.Result;
import org.apache.harmony.jndi.internal.EnvironmentReader;
import org.apache.harmony.jndi.internal.UrlParser;
import org.apache.harmony.jndi.internal.nls.Messages;
/**
* The <code>DirectoryManager</code> class cannot be instantiated. All its
* methods are static. The methods are used by service providers for accessing
* object and state factories and for determining continuation contexts.
* <p>
* The <code>Name</code> and <code>Hashtable</code> arguments passed to the
* <code>DirectoryManager</code> methods remain owned purely by the calling
* method. They must not be changed or referenced.
* </p>
* <p>
* Multithreaded access to this class must be safe.
* </p>
*/
public class DirectoryManager extends NamingManager {
/**
* An inner class that transforms a Context instance into DirContext.
*/
private static class Context2DirContextWrapper implements DirContext {
private final Context ctx;
private final CannotProceedException cpe;
public Context2DirContextWrapper(Context ctx, CannotProceedException cpe) {
this.ctx = ctx;
this.cpe = cpe;
}
@Override
public Object addToEnvironment(String s, Object o)
throws NamingException {
return getContext().addToEnvironment(s, o);
}
@Override
public void bind(Name n, Object o) throws NamingException {
getContext().bind(n, o);
}
@Override
public void bind(Name name, Object obj, Attributes attributes)
throws NamingException {
getDirContext().bind(name, obj, attributes);
}
@Override
public void bind(String s, Object o) throws NamingException {
getContext().bind(s, o);
}
@Override
public void bind(String s, Object obj, Attributes attributes)
throws NamingException {
getDirContext().bind(s, obj, attributes);
}
@Override
public void close() throws NamingException {
getContext().close();
}
@Override
public Name composeName(Name n, Name pfx) throws NamingException {
return getContext().composeName(n, pfx);
}
@Override
public String composeName(String s, String pfx) throws NamingException {
return getContext().composeName(s, pfx);
}
@Override
public Context createSubcontext(Name n) throws NamingException {
return getContext().createSubcontext(n);
}
@Override
public DirContext createSubcontext(Name name, Attributes attributes)
throws NamingException {
return getDirContext().createSubcontext(name, attributes);
}
@Override
public Context createSubcontext(String s) throws NamingException {
return getContext().createSubcontext(s);
}
@Override
public DirContext createSubcontext(String s, Attributes attributes)
throws NamingException {
return getDirContext().createSubcontext(s, attributes);
}
@Override
public void destroySubcontext(Name n) throws NamingException {
getContext().destroySubcontext(n);
}
@Override
public void destroySubcontext(String s) throws NamingException {
getContext().destroySubcontext(s);
}
@Override
public boolean equals(Object arg0) {
try {
return getContext().equals(arg0);
} catch (final CannotProceedException e) {
return super.equals(arg0);
}
}
@Override
public Attributes getAttributes(Name name) throws NamingException {
return getDirContext().getAttributes(name);
}
@Override
public Attributes getAttributes(Name name, String[] as)
throws NamingException {
return getDirContext().getAttributes(name, as);
}
@Override
public Attributes getAttributes(String s) throws NamingException {
return getDirContext().getAttributes(s);
}
@Override
public Attributes getAttributes(String s, String[] as)
throws NamingException {
return getDirContext().getAttributes(s, as);
}
private Context getContext() throws CannotProceedException {
if (ctx != null) {
return ctx;
}
cpe.fillInStackTrace();
throw cpe;
}
private DirContext getDirContext() throws CannotProceedException {
if (ctx instanceof DirContext) {
return (DirContext) ctx;
}
cpe.fillInStackTrace();
throw cpe;
}
@Override
public Hashtable<?, ?> getEnvironment() throws NamingException {
return getContext().getEnvironment();
}
@Override
public String getNameInNamespace() throws NamingException {
return getContext().getNameInNamespace();
}
@Override
public NameParser getNameParser(Name n) throws NamingException {
return getContext().getNameParser(n);
}
@Override
public NameParser getNameParser(String s) throws NamingException {
return getContext().getNameParser(s);
}
@Override
public DirContext getSchema(Name name) throws NamingException {
return getDirContext().getSchema(name);
}
@Override
public DirContext getSchema(String s) throws NamingException {
return getDirContext().getSchema(s);
}
@Override
public DirContext getSchemaClassDefinition(Name name)
throws NamingException {
return getDirContext().getSchemaClassDefinition(name);
}
@Override
public DirContext getSchemaClassDefinition(String s)
throws NamingException {
return getDirContext().getSchemaClassDefinition(s);
}
@Override
public int hashCode() {
try {
return getContext().hashCode();
} catch (final CannotProceedException e) {
return super.hashCode();
}
}
@Override
public NamingEnumeration<NameClassPair> list(Name n)
throws NamingException {
return getContext().list(n);
}
@Override
public NamingEnumeration<NameClassPair> list(String s)
throws NamingException {
return getContext().list(s);
}
@Override
public NamingEnumeration<Binding> listBindings(Name n)
throws NamingException {
return getContext().listBindings(n);
}
@Override
public NamingEnumeration<Binding> listBindings(String s)
throws NamingException {
return getContext().listBindings(s);
}
@Override
public Object lookup(Name n) throws NamingException {
return getContext().lookup(n);
}
@Override
public Object lookup(String s) throws NamingException {
return getContext().lookup(s);
}
@Override
public Object lookupLink(Name n) throws NamingException {
return getContext().lookupLink(n);
}
@Override
public Object lookupLink(String s) throws NamingException {
return getContext().lookupLink(s);
}
@Override
public void modifyAttributes(Name name, int i, Attributes attributes)
throws NamingException {
getDirContext().modifyAttributes(name, i, attributes);
}
@Override
public void modifyAttributes(Name name,
ModificationItem[] modificationItems) throws NamingException {
getDirContext().modifyAttributes(name, modificationItems);
}
@Override
public void modifyAttributes(String s, int i, Attributes attributes)
throws NamingException {
getDirContext().modifyAttributes(s, i, attributes);
}
@Override
public void modifyAttributes(String s,
ModificationItem[] modificationItems) throws NamingException {
getDirContext().modifyAttributes(s, modificationItems);
}
@Override
public void rebind(Name n, Object o) throws NamingException {
getContext().rebind(n, o);
}
@Override
public void rebind(Name name, Object obj, Attributes attributes)
throws NamingException {
getDirContext().rebind(name, obj, attributes);
}
@Override
public void rebind(String s, Object o) throws NamingException {
getContext().rebind(s, o);
}
@Override
public void rebind(String s, Object obj, Attributes attributes)
throws NamingException {
getDirContext().rebind(s, obj, attributes);
}
@Override
public Object removeFromEnvironment(String s) throws NamingException {
return getContext().removeFromEnvironment(s);
}
@Override
public void rename(Name nOld, Name nNew) throws NamingException {
getContext().rename(nOld, nNew);
}
@Override
public void rename(String sOld, String sNew) throws NamingException {
getContext().rename(sOld, sNew);
}
@Override
public NamingEnumeration<SearchResult> search(Name name,
Attributes attributes) throws NamingException {
return getDirContext().search(name, attributes);
}
@Override
public NamingEnumeration<SearchResult> search(Name name,
Attributes attributes, String[] as) throws NamingException {
return getDirContext().search(name, attributes, as);
}
@Override
public NamingEnumeration<SearchResult> search(Name name, String filter,
Object[] objs, SearchControls searchControls)
throws NamingException {
return getDirContext().search(name, filter, objs, searchControls);
}
@Override
public NamingEnumeration<SearchResult> search(Name name, String filter,
SearchControls searchControls) throws NamingException {
return getDirContext().search(name, filter, searchControls);
}
@Override
public NamingEnumeration<SearchResult> search(String name,
Attributes attributes) throws NamingException {
return getDirContext().search(name, attributes);
}
@Override
public NamingEnumeration<SearchResult> search(String name,
Attributes attributes, String[] as) throws NamingException {
return getDirContext().search(name, attributes, as);
}
@Override
public NamingEnumeration<SearchResult> search(String name,
String filter, Object[] objs, SearchControls searchControls)
throws NamingException {
return getDirContext().search(name, filter, objs, searchControls);
}
@Override
public NamingEnumeration<SearchResult> search(String name,
String filter, SearchControls searchControls)
throws NamingException {
return getDirContext().search(name, filter, searchControls);
}
@Override
public String toString() {
try {
return getContext().toString();
} catch (final CannotProceedException e) {
return super.toString();
}
}
@Override
public void unbind(Name n) throws NamingException {
getContext().unbind(n);
}
@Override
public void unbind(String s) throws NamingException {
getContext().unbind(s);
}
}
private static Class<?> classForName(final String className)
throws ClassNotFoundException {
final Class<?> cls = AccessController
.doPrivileged(new PrivilegedAction<Class<?>>() {
@Override
public Class<?> run() {
// try thread context class loader first
try {
return Class.forName(className, true, Thread
.currentThread().getContextClassLoader());
} catch (final ClassNotFoundException e) {
// Could happen.
}
// try system class loader second
try {
return Class.forName(className, true,
ClassLoader.getSystemClassLoader());
} catch (final ClassNotFoundException e1) {
// Not found here either.
}
// return null, if fail to load class
return null;
}
});
if (cls == null) {
// jndi.1C=class {0} not found
throw new ClassNotFoundException(Messages.getString(
"jndi.1C", className)); //$NON-NLS-1$
}
return cls;
}
/**
* Create the next <code>DirContext</code> when using federation so that the
* <code>DirContext</code> operation can be reinvoked. This should work
* similarly to <code>NamingManager.getContinuationContext</code> except
* that a reference to a <code>DirContext</code> is returned.
* <p>
* This method is also responsible for setting the property denoted by the
* <code>CPE</code> string to be the supplied
* <code>CannotProceedException</code> for that environment.
* </p>
*
* @param cpe
* the <code>CannotProceedException</code> generated by the
* <code>DirContext</code> of the previous naming system when it
* can proceed no further.
* @return the next <code>DirContext</code> when using federation
* @throws NamingException
* if the resolved object is not set or if a
* <code>DirContext</code> cannot be obtained from it either
* directly or indirectly.
*/
public static DirContext getContinuationDirContext(
CannotProceedException cpe) throws NamingException {
// obtain next context using NamingManager
Context nextContext = null;
try {
nextContext = NamingManager.getContinuationContext(cpe);
} catch (final CannotProceedException e) {
// tolerate CannotProceedException here
}
// if it is a DirContext
if (nextContext instanceof DirContext) {
// return as DirContext
return (DirContext) nextContext;
}
// in case it's Context but not DirContext, wrap it as DirContext
// and return
return new Context2DirContextWrapper(nextContext, cpe);
}
/**
* Create an object using an object factory. Returns a new
* <code>Object</code> or the supplied <code>Object o</code> if one cannot
* be created.
*
* The behaviour is like that for the <code>getObjectInstance</code> method
* of <code>NamingManager</code> however it should be noted that the
* intermediate object factory may be either of type
* <code>DirObjectFactory</code> or of type <code>ObjectFactory</code>; in
* the former case, the supplied <code>Attributes</code> must be passed when
* getting the object, otherwise the supplied <code>Attributes</code> are
* ignored.
*
* @param o
* An object which may provide reference or location information.
* May be null.
* @param n
* The name of the <code>Object</code> relative to the default
* initial context (or relative to the Context c if it is
* supplied)
* @param c
* The <code>Context</code> to which the Name is relative
* @param h
* a <code>Hashtable</code> containing environment properties and
* values - may be null
* @param a
* <code>Attributes</code> - if some or all of the attributes of
* <code>Object o</code> are already known they can be supplied
* so that the factory does not have to do the work of looking
* them up.
* @return the created object
* @throws NamingException
* if one is encountered
* @throws Exception
* if any other exception is encountered
*/
public static Object getObjectInstance(Object o, Name n, Context c,
Hashtable<?, ?> h, Attributes a) throws Exception {
// 1. try ObjectFactoryBuilder, if it is set
if (null != ofb) {
// use the builder to create an object factory
final ObjectFactory factory = ofb.createObjectFactory(o, h);
// get object instance using the factory and return
return getObjectInstanceFromGivenFactory(factory, o, n, c, h, a);
}
// 2. see whether o is a Referenceable or a Reference
Reference ref = null;
if (o instanceof Referenceable) {
ref = ((Referenceable) o).getReference();
}
if (o instanceof Reference) {
ref = (Reference) o;
}
// if o is a Referenceable or a Reference
if (null != ref) {
// if a factory class name is supplied by the reference, use it to
// create
if (null != ref.getFactoryClassName()) {
return getObjectInstanceByFactoryInReference(ref, o, n, c, h, a);
}
// see if ref has any StringRefAddrs of address type URL,
final Object result = getObjectInstanceByUrlRefAddr(n, c, h, ref);
// if success, return it
if (null != result) {
return result;
}
}
// 3. try Context.OBJECT_FACTORIES
final Object result = getObjectInstanceByObjectFactory(o, n, c, h, a);
if (null != result) {
return result;
}
// all failed, just return o
return o;
}
private static Object getObjectInstanceByFactoryInReference(Reference ref,
Object o, Name n, Context c, Hashtable<?, ?> h, Attributes a)
throws Exception {
ObjectFactory factory = null;
// try load the factory by its class name
try {
factory = (ObjectFactory) classForName(ref.getFactoryClassName())
.newInstance();
} catch (final ClassNotFoundException e) {
// Ignored.
}
// try load the factory from its class location
if (null == factory && null != ref.getFactoryClassLocation()) {
factory = (ObjectFactory) loadFactoryFromLocation(
ref.getFactoryClassName(), ref.getFactoryClassLocation());
}
// if factory cannot be loaded
if (null == factory) {
// return o
return o;
}
// get object instance using the factory and return it
return getObjectInstanceFromGivenFactory(factory, ref, n, c, h, a);
}
private static Object getObjectInstanceByObjectFactory(Object o, Name n,
Context c, Hashtable<?, ?> h, Attributes a) throws NamingException,
Exception {
// obtain object factories from hashtable and service provider resource
// file
final String fnames[] = EnvironmentReader
.getFactoryNamesFromEnvironmentAndProviderResource(h, c,
Context.OBJECT_FACTORIES);
for (final String element : fnames) {
// new factory instance by its class name
ObjectFactory factory = null;
try {
factory = (ObjectFactory) classForName(element).newInstance();
} catch (final Exception e) {
continue;
}
// create object using factory
final Object obj = getObjectInstanceFromGivenFactory(factory, o, n,
c, h, a);
if (null != obj) {
return obj;
}
}
// no object factory succeeded, return null
return null;
}
private static Object getObjectInstanceByUrlContextFactory(String url,
Name n, Context c, Hashtable<?, ?> h, String pkgPrefixes[],
String schema) throws NamingException {
// if schema is empty or null, fail, return null
if (null == schema || 0 == schema.length()) {
return null;
}
for (final String element : pkgPrefixes) {
ObjectFactory factory = null;
try {
// create url context factory instance
final String clsName = element
+ "." + schema + "." + schema + "URLContextFactory"; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
factory = (ObjectFactory) classForName(clsName).newInstance();
} catch (final Exception e) {
// failed to create factory, continue trying
continue;
}
try {
// create obj using url context factory
/*
* Unit test shows it is ObjectFactory here, not
* DirObjectFactory // Object obj =
* factory.getObjectInstance(url, n, c, h, a);
*/
final Object obj = factory.getObjectInstance(url, n, c, h);
// if create success, return it
if (null != obj) {
return obj;
}
} catch (final Exception e) {
// throw NamingException, if factory fails
if (e instanceof NamingException) {
throw (NamingException) e;
}
// jndi.21=Failed to create object instance
final NamingException nex = new NamingException(
Messages.getString("jndi.21")); //$NON-NLS-1$
nex.setRootCause(e);
throw nex;
}
}
// fail to create using url context factory, return null
return null;
}
private static Object getObjectInstanceByUrlRefAddr(Name n, Context c,
Hashtable<?, ?> h, Reference ref) throws NamingException {
// obtain pkg prefixes from hashtable and service provider resource file
final String pkgPrefixes[] = EnvironmentReader
.getFactoryNamesFromEnvironmentAndProviderResource(h, c,
Context.URL_PKG_PREFIXES);
// for each RefAddr
final Enumeration<RefAddr> enumeration = ref.getAll();
while (enumeration.hasMoreElements()) {
final RefAddr addr = enumeration.nextElement();
// if it is StringRefAddr and type is URL
if (addr instanceof StringRefAddr
&& addr.getType().equalsIgnoreCase("URL")) { //$NON-NLS-1$
// get the url address
final String url = (String) ((StringRefAddr) addr).getContent();
// try create using url context factory
final Object obj = getObjectInstanceByUrlContextFactory(url, n,
c, h, pkgPrefixes, UrlParser.getScheme(url));
// if success, return the created obj
if (null != obj) {
return obj;
}
}
}
// failed to create using any StringRefAddr of address type URL, return
// null
return null;
}
/**
* Check the type of factory, DirObjectFactory or ObjectFactory, and call
* getObjectInstance() on the property type.
*/
private static Object getObjectInstanceFromGivenFactory(
ObjectFactory factory, Object o, Name n, Context c,
Hashtable<?, ?> h, Attributes a) throws Exception {
if (factory instanceof DirObjectFactory) {
return ((DirObjectFactory) factory)
.getObjectInstance(o, n, c, h, a);
}
return factory.getObjectInstance(o, n, c, h);
}
/**
* Get the state of an Object. Returns a <code>DirStateFactory</code>.
* Result which cannot be null. It contains the attributes and object to be
* bound, either of which may be null. Once returned the caller is the owner
* of it. The behaviour is like that for the <code>getStateToBind</code>
* method of <code>NamingManager</code> however it should be noted that the
* intermediate state factory may be of type <code>DirStateFactory</code>
* rather than just <code>StateFactory</code> in which case it should also
* use the supplied <code>Attributes</code> when getting the state.
*
* @param o
* An object which may provide reference or location information.
* May be null.
* @param n
* The name of the <code>Object</code> relative to the default
* initial context (or relative to the Context c if it is
* supplied)
* @param c
* The <code>Context</code> to which the <code>Name</code> is
* relative
* @param h
* a <code>Hashtable</code> containing environment properties and
* values - may be null
* @param a
* <code>Attributes</code> - if some or all of the attributes of
* <code>Object o</code> are already known they can be supplied
* so that the factory does not have to do the work of looking
* them up.
* @return the state of the object
* @throws NamingException
* if one is encountered
*/
public static DirStateFactory.Result getStateToBind(Object o, Name n,
Context c, Hashtable<?, ?> h, Attributes a) throws NamingException {
// obtain state factories from hashtable and service provider resource
// file
final String fnames[] = EnvironmentReader
.getFactoryNamesFromEnvironmentAndProviderResource(h, c,
Context.STATE_FACTORIES);
for (final String element : fnames) {
// new factory instance by its class name
StateFactory factory = null;
try {
factory = (StateFactory) classForName(element).newInstance();
} catch (final Exception e) {
continue;
}
if (factory instanceof DirStateFactory) {
// try obtain state using the DirStateFactory
final Result r = ((DirStateFactory) factory).getStateToBind(o,
n, c, h, a);
// if the result is not null, return it
if (null != r) {
return r;
}
} else {
// try obtain state using the StateFactory
final Object state = factory.getStateToBind(o, n, c, h);
// if a state obtained successfully, return it
if (null != state) {
return new Result(state, a);
}
}
}
// all factories failed, return the input argument o
return new Result(o, a);
}
/*
* If cannot load class, return null. Throws any exceptions except
* ClassNotFoundException
*/
private static Object loadFactoryFromLocation(String clsName,
String location) throws Exception {
// convert location into an array of URL, separated by ' '
final StringTokenizer st = new StringTokenizer(location, " "); //$NON-NLS-1$
final URL urls[] = new URL[st.countTokens()];
for (int i = 0; i < urls.length; i++) {
urls[i] = new URL(st.nextToken());
}
// new a URLClassLoader from the URLs
final URLClassLoader l = new URLClassLoader(urls);
// try load factory by URLClassLoader
try {
// return the new instance
return l.loadClass(clsName).newInstance();
} catch (final ClassNotFoundException e) {
// return null if class loading failed
return null;
}
}
// Private to prevent it being instanced
private DirectoryManager() {
}
}