diff options
Diffstat (limited to 'qpid/java/client/src/main/java/org/apache/qpid/naming/ReadOnlyContext.java')
-rw-r--r-- | qpid/java/client/src/main/java/org/apache/qpid/naming/ReadOnlyContext.java | 509 |
1 files changed, 0 insertions, 509 deletions
diff --git a/qpid/java/client/src/main/java/org/apache/qpid/naming/ReadOnlyContext.java b/qpid/java/client/src/main/java/org/apache/qpid/naming/ReadOnlyContext.java deleted file mode 100644 index 59ec4cfba7..0000000000 --- a/qpid/java/client/src/main/java/org/apache/qpid/naming/ReadOnlyContext.java +++ /dev/null @@ -1,509 +0,0 @@ -/* 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.qpid.naming; - -import org.apache.qpid.jndi.NameParserImpl; - -import javax.naming.*; -import javax.naming.spi.NamingManager; -import java.io.Serializable; -import java.util.*; - -/** - * Based on class from ActiveMQ. - * A read-only Context - * <p/> - * This version assumes it and all its subcontext are read-only and any attempt - * to modify (e.g. through bind) will result in an OperationNotSupportedException. - * Each Context in the tree builds a cache of the entries in all sub-contexts - * to optimise the performance of lookup. - * </p> - * <p>This implementation is intended to optimise the performance of lookup(String) - * to about the level of a HashMap get. It has been observed that the scheme - * resolution phase performed by the JVM takes considerably longer, so for - * optimum performance lookups should be coded like:</p> - * <code> - * Context componentContext = (Context)new InitialContext().lookup("java:comp"); - * String envEntry = (String) componentContext.lookup("env/myEntry"); - * String envEntry2 = (String) componentContext.lookup("env/myEntry2"); - * </code> - */ -public class ReadOnlyContext implements Context, Serializable -{ - private static final long serialVersionUID = -5754338187296859149L; - protected static final NameParser nameParser = new NameParserImpl(); - - 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 ReadOnlyContext() - { - environment = new Hashtable(); - bindings = new HashMap(); - treeBindings = new HashMap(); - } - - public ReadOnlyContext(Hashtable env) - { - if (env == null) - { - this.environment = new Hashtable(); - } - else - { - this.environment = new Hashtable(env); - } - - this.bindings = Collections.EMPTY_MAP; - this.treeBindings = Collections.EMPTY_MAP; - } - - public ReadOnlyContext(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 ReadOnlyContext(Hashtable environment, Map bindings, String nameInNamespace) - { - this(environment, bindings); - this.nameInNamespace = nameInNamespace; - } - - protected ReadOnlyContext(ReadOnlyContext clone, Hashtable env) - { - this.bindings = clone.bindings; - this.treeBindings = clone.treeBindings; - this.environment = new Hashtable(env); - } - - protected ReadOnlyContext(ReadOnlyContext clone, Hashtable env, String nameInNamespace) - { - this(clone, env); - this.nameInNamespace = nameInNamespace; - } - - public void freeze() - { - frozen = true; - } - - boolean isFrozen() - { - return frozen; - } - - /** - * 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 - { - assert (name != null) && (name.length() > 0); - assert !frozen; - - Map newBindings = new HashMap(); - int pos = name.indexOf('/'); - if (pos == -1) - { - if (treeBindings.put(name, value) != null) - { - throw new NamingException("Something already bound at " + name); - } - - bindings.put(name, value); - newBindings.put(name, value); - } - else - { - String segment = name.substring(0, pos); - assert segment != null; - assert !segment.equals(""); - 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 ReadOnlyContext)) - { - throw new NamingException("Something already bound where a subcontext should go"); - } - - ReadOnlyContext readOnlyContext = (ReadOnlyContext) o; - String remainder = name.substring(pos + 1); - Map subBindings = readOnlyContext.internalBind(remainder, value); - 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 ReadOnlyContext newContext() - { - return new ReadOnlyContext(); - } - - 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 ReadOnlyContext) - { - String prefix = getNameInNamespace(); - if (prefix.length() > 0) - { - prefix = prefix + SEPARATOR; - } - - result = new ReadOnlyContext((ReadOnlyContext) 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 ReadOnlyContext.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 ReadOnlyContext.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 obj) throws NamingException - { - throw new OperationNotSupportedException(); - } - - public void bind(String name, Object obj) throws NamingException - { - throw new OperationNotSupportedException(); - } - - 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 obj) throws NamingException - { - throw new OperationNotSupportedException(); - } - - public void rebind(String name, Object obj) throws NamingException - { - throw new OperationNotSupportedException(); - } - - public void rename(Name oldName, Name newName) throws NamingException - { - throw new OperationNotSupportedException(); - } - - public void rename(String oldName, String newName) throws NamingException - { - throw new OperationNotSupportedException(); - } - - public void unbind(Name name) throws NamingException - { - throw new OperationNotSupportedException(); - } - - public void unbind(String name) throws NamingException - { - throw new OperationNotSupportedException(); - } - - 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 ReadOnlyContext.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 ReadOnlyContext.LocalNamingEnumeration - { - public Object next() throws NamingException - { - return nextElement(); - } - - public Object nextElement() - { - Map.Entry entry = getNext(); - - return new Binding((String) entry.getKey(), entry.getValue()); - } - } -} |