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xbean-spring provides a schema-driven proprietary namespace handler for spring contexts
/**
* 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.xbean.spring.jndi;
import javax.naming.Binding;
import javax.naming.CompositeName;
import javax.naming.Context;
import javax.naming.LinkRef;
import javax.naming.Name;
import javax.naming.NameClassPair;
import javax.naming.NameNotFoundException;
import javax.naming.NameParser;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.NotContextException;
import javax.naming.OperationNotSupportedException;
import javax.naming.Reference;
import javax.naming.spi.NamingManager;
import java.io.Serializable;
import java.util.HashMap;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Map;
/**
* A simple spring based JNDI context which is mutable
*
* @version $Revision: 657 $
*/
public class DefaultContext implements Context, Serializable {
private static final long serialVersionUID = -5754338187296859149L;
protected static final NameParser nameParser = new NameParserImpl();
private boolean freeze = false;
protected final Hashtable environment; // environment for this context
protected final Map bindings; // bindings at my level
protected final Map treeBindings; // all bindings under me
private boolean frozen = false;
private String nameInNamespace = "";
public static final String SEPARATOR = "/";
public DefaultContext() {
environment = new Hashtable();
bindings = new HashMap();
treeBindings = new HashMap();
}
public DefaultContext(Hashtable env) {
if (env == null) {
this.environment = new Hashtable();
}
else {
this.environment = new Hashtable(env);
}
this.bindings = new HashMap();
this.treeBindings = new HashMap();
}
public DefaultContext(Hashtable environment, Map bindings) {
if (environment == null) {
this.environment = new Hashtable();
}
else {
this.environment = new Hashtable(environment);
}
this.bindings = bindings;
treeBindings = new HashMap();
frozen = true;
}
public DefaultContext(Hashtable environment, Map bindings, String nameInNamespace) {
this(environment, bindings);
this.nameInNamespace = nameInNamespace;
}
protected DefaultContext(DefaultContext clone, Hashtable env) {
this.bindings = clone.bindings;
this.treeBindings = clone.treeBindings;
this.environment = new Hashtable(env);
}
protected DefaultContext(DefaultContext clone, Hashtable env, String nameInNamespace) {
this(clone, env);
this.nameInNamespace = nameInNamespace;
}
public Object addToEnvironment(String propName, Object propVal) throws NamingException {
return environment.put(propName, propVal);
}
public Hashtable getEnvironment() throws NamingException {
return (Hashtable) environment.clone();
}
public Object removeFromEnvironment(String propName) throws NamingException {
return environment.remove(propName);
}
public Object lookup(String name) throws NamingException {
if (name.length() == 0) {
return this;
}
Object result = treeBindings.get(name);
if (result == null) {
result = bindings.get(name);
}
if (result == null) {
int pos = name.indexOf(':');
if (pos > 0) {
String scheme = name.substring(0, pos);
Context ctx = NamingManager.getURLContext(scheme, environment);
if (ctx == null) {
throw new NamingException("scheme " + scheme + " not recognized");
}
return ctx.lookup(name);
}
else {
// Split out the first name of the path
// and look for it in the bindings map.
CompositeName path = new CompositeName(name);
if (path.size() == 0) {
return this;
}
else {
String first = path.get(0);
Object obj = bindings.get(first);
if (obj == null) {
throw new NameNotFoundException(name);
}
else if (obj instanceof Context && path.size() > 1) {
Context subContext = (Context) obj;
obj = subContext.lookup(path.getSuffix(1));
}
return obj;
}
}
}
if (result instanceof LinkRef) {
LinkRef ref = (LinkRef) result;
result = lookup(ref.getLinkName());
}
if (result instanceof Reference) {
try {
result = NamingManager.getObjectInstance(result, null, null, this.environment);
}
catch (NamingException e) {
throw e;
}
catch (Exception e) {
throw (NamingException) new NamingException("could not look up : " + name).initCause(e);
}
}
if (result instanceof DefaultContext) {
String prefix = getNameInNamespace();
if (prefix.length() > 0) {
prefix = prefix + SEPARATOR;
}
result = new DefaultContext((DefaultContext) result, environment, prefix + name);
}
return result;
}
public Object lookup(Name name) throws NamingException {
return lookup(name.toString());
}
public Object lookupLink(String name) throws NamingException {
return lookup(name);
}
public Name composeName(Name name, Name prefix) throws NamingException {
Name result = (Name) prefix.clone();
result.addAll(name);
return result;
}
public String composeName(String name, String prefix) throws NamingException {
CompositeName result = new CompositeName(prefix);
result.addAll(new CompositeName(name));
return result.toString();
}
public NamingEnumeration list(String name) throws NamingException {
Object o = lookup(name);
if (o == this) {
return new DefaultContext.ListEnumeration();
}
else if (o instanceof Context) {
return ((Context) o).list("");
}
else {
throw new NotContextException();
}
}
public NamingEnumeration listBindings(String name) throws NamingException {
Object o = lookup(name);
if (o == this) {
return new DefaultContext.ListBindingEnumeration();
}
else if (o instanceof Context) {
return ((Context) o).listBindings("");
}
else {
throw new NotContextException();
}
}
public Object lookupLink(Name name) throws NamingException {
return lookupLink(name.toString());
}
public NamingEnumeration list(Name name) throws NamingException {
return list(name.toString());
}
public NamingEnumeration listBindings(Name name) throws NamingException {
return listBindings(name.toString());
}
public void bind(Name name, Object value) throws NamingException {
bind(name.toString(), value);
}
public void bind(String name, Object value) throws NamingException {
checkFrozen();
internalBind(name, value);
}
public void close() throws NamingException {
// ignore
}
public Context createSubcontext(Name name) throws NamingException {
throw new OperationNotSupportedException();
}
public Context createSubcontext(String name) throws NamingException {
throw new OperationNotSupportedException();
}
public void destroySubcontext(Name name) throws NamingException {
throw new OperationNotSupportedException();
}
public void destroySubcontext(String name) throws NamingException {
throw new OperationNotSupportedException();
}
public String getNameInNamespace() throws NamingException {
return nameInNamespace;
}
public NameParser getNameParser(Name name) throws NamingException {
return nameParser;
}
public NameParser getNameParser(String name) throws NamingException {
return nameParser;
}
public void rebind(Name name, Object value) throws NamingException {
rebind(name.toString(), value);
}
public void rebind(String name, Object value) throws NamingException {
checkFrozen();
internalBind(name, value, true);
}
public void rename(Name oldName, Name newName) throws NamingException {
checkFrozen();
Object value = lookup(oldName);
unbind(oldName);
bind(newName, value);
}
public void rename(String oldName, String newName) throws NamingException {
Object value = lookup(oldName);
unbind(oldName);
bind(newName, value);
}
public void unbind(Name name) throws NamingException {
unbind(name.toString());
}
public void unbind(String name) throws NamingException {
checkFrozen();
internalBind(name, null, true);
}
private abstract class LocalNamingEnumeration implements NamingEnumeration {
private Iterator i = bindings.entrySet().iterator();
public boolean hasMore() throws NamingException {
return i.hasNext();
}
public boolean hasMoreElements() {
return i.hasNext();
}
protected Map.Entry getNext() {
return (Map.Entry) i.next();
}
public void close() throws NamingException {
}
}
private class ListEnumeration extends DefaultContext.LocalNamingEnumeration {
public Object next() throws NamingException {
return nextElement();
}
public Object nextElement() {
Map.Entry entry = getNext();
return new NameClassPair((String) entry.getKey(), entry.getValue().getClass().getName());
}
}
private class ListBindingEnumeration extends DefaultContext.LocalNamingEnumeration {
public Object next() throws NamingException {
return nextElement();
}
public Object nextElement() {
Map.Entry entry = getNext();
return new Binding((String) entry.getKey(), entry.getValue());
}
}
public Map getEntries() {
return new HashMap(bindings);
}
public void setEntries(Map entries) throws NamingException {
if (entries != null) {
for (Iterator iter = entries.entrySet().iterator(); iter.hasNext();) {
Map.Entry entry = (Map.Entry) iter.next();
String name = (String) entry.getKey();
Object value = entry.getValue();
internalBind(name, value);
}
}
}
public boolean isFreeze() {
return freeze;
}
public void setFreeze(boolean freeze) {
this.freeze = freeze;
}
/**
* internalBind is intended for use only during setup or possibly by suitably synchronized superclasses.
* It binds every possible lookup into a map in each context. To do this, each context
* strips off one name segment and if necessary creates a new context for it. Then it asks that context
* to bind the remaining name. It returns a map containing all the bindings from the next context, plus
* the context it just created (if it in fact created it). (the names are suitably extended by the segment
* originally lopped off).
*
* @param name
* @param value
* @return
* @throws javax.naming.NamingException
*/
protected Map internalBind(String name, Object value) throws NamingException {
return internalBind(name, value, false);
}
protected Map internalBind(String name, Object value, boolean allowRebind) throws NamingException {
if (name == null || name.length() == 0){
throw new NamingException("Invalid Name " + name);
}
if (frozen){
throw new NamingException("Read only");
}
Map newBindings = new HashMap();
int pos = name.indexOf('/');
if (pos == -1) {
Object oldValue = treeBindings.put(name, value);
if (!allowRebind && oldValue != null) {
throw new NamingException("Something already bound at " + name);
}
bindings.put(name, value);
newBindings.put(name, value);
}
else {
String segment = name.substring(0, pos);
if (segment == null || segment.length()==0){
throw new NamingException("Invalid segment " + segment);
}
Object o = treeBindings.get(segment);
if (o == null) {
o = newContext();
treeBindings.put(segment, o);
bindings.put(segment, o);
newBindings.put(segment, o);
}
else if (!(o instanceof DefaultContext)) {
throw new NamingException("Something already bound where a subcontext should go");
}
DefaultContext defaultContext = (DefaultContext) o;
String remainder = name.substring(pos + 1);
Map subBindings = defaultContext.internalBind(remainder, value, allowRebind);
for (Iterator iterator = subBindings.entrySet().iterator(); iterator.hasNext();) {
Map.Entry entry = (Map.Entry) iterator.next();
String subName = segment + "/" + (String) entry.getKey();
Object bound = entry.getValue();
treeBindings.put(subName, bound);
newBindings.put(subName, bound);
}
}
return newBindings;
}
protected void checkFrozen() throws OperationNotSupportedException {
if (isFreeze()) {
throw new OperationNotSupportedException("JNDI context is frozen!");
}
}
protected DefaultContext newContext() {
return new DefaultContext();
}
}