/*
* Copyright 1999-2005 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
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*/
package com.sun.jndi.cosnaming;
import javax.naming.*;
import javax.naming.spi.NamingManager;
import java.util.NoSuchElementException;
import java.util.Hashtable;
import org.omg.CosNaming.*;
import org.omg.CosNaming.NamingContextPackage.*;
import org.omg.CORBA.*;
/**
* Implements the JNDI NamingEnumeration interface for COS
* Naming. Gets hold of a list of bindings from the COS Naming Server
* and allows the client to iterate through them.
*
* @author Raj Krishnamurthy
* @author Rosanna Lee
*/
final class CNBindingEnumeration implements NamingEnumeration {
private static final int DEFAULT_BATCHSIZE = 100;
private BindingListHolder _bindingList; // list of bindings
private BindingIterator _bindingIter; // iterator for getting list of bindings
private int counter; // pointer in _bindingList
private int batchsize = DEFAULT_BATCHSIZE; // how many to ask for each time
private CNCtx _ctx; // ctx to list
private Hashtable _env; // environment for getObjectInstance
private boolean more = false; // iterator done?
private boolean isLookedUpCtx = false; // iterating on a context beneath this context ?
/**
* Creates a CNBindingEnumeration object.
* @param ctx Context to enumerate
*/
CNBindingEnumeration(CNCtx ctx, boolean isLookedUpCtx, Hashtable env) {
// Get batch size to use
String batch = (env != null ?
(String)env.get(javax.naming.Context.BATCHSIZE) : null);
if (batch != null) {
try {
batchsize = Integer.parseInt(batch);
} catch (NumberFormatException e) {
throw new IllegalArgumentException("Batch size not numeric: " + batch);
}
}
_ctx = ctx;
_ctx.incEnumCount();
this.isLookedUpCtx = isLookedUpCtx;
_env = env;
_bindingList = new BindingListHolder();
BindingIteratorHolder _bindingIterH = new BindingIteratorHolder();
// Perform listing and request that bindings be returned in _bindingIter
// Upon return,_bindingList returns a zero length list
_ctx._nc.list(0, _bindingList, _bindingIterH);
_bindingIter = _bindingIterH.value;
// Get first batch using _bindingIter
if (_bindingIter != null) {
more = _bindingIter.next_n(batchsize, _bindingList);
} else {
more = false;
}
counter = 0;
}
/**
* Returns the next binding in the list.
* @exception NamingException any naming exception.
*/
public java.lang.Object next() throws NamingException {
if (more && counter >= _bindingList.value.length) {
getMore();
}
if (more && counter < _bindingList.value.length) {
org.omg.CosNaming.Binding bndg = _bindingList.value[counter];
counter++;
return mapBinding(bndg);
} else {
throw new NoSuchElementException();
}
}
/**
* Returns true or false depending on whether there are more bindings.
* @return boolean value
*/
public boolean hasMore() throws NamingException {
// If there's more, check whether current bindingList has been exhausted,
// and if so, try to get more.
// If no more, just say so.
return more ? (counter < _bindingList.value.length || getMore()) : false;
}
/**
* Returns true or false depending on whether there are more bindings.
* Need to define this to satisfy the Enumeration api requirement.
* @return boolean value
*/
public boolean hasMoreElements() {
try {
return hasMore();
} catch (NamingException e) {
return false;
}
}
/**
* Returns the next binding in the list.
* @exception NoSuchElementException Thrown when the end of the
* list is reached.
*/
public java.lang.Object nextElement() {
try {
return next();
} catch (NamingException ne) {
throw new NoSuchElementException();
}
}
public void close() throws NamingException {
more = false;
if (_bindingIter != null) {
_bindingIter.destroy();
_bindingIter = null;
}
if (_ctx != null) {
_ctx.decEnumCount();
/**
* context was obtained by CNCtx, the user doesn't have a handle to
* it, close it as we are done enumerating through the context
*/
if (isLookedUpCtx) {
_ctx.close();
}
_ctx = null;
}
}
protected void finalize() {
try {
close();
} catch (NamingException e) {
// ignore failures
}
}
/**
* Get the next batch using _bindingIter. Update the 'more' field.
*/
private boolean getMore() throws NamingException {
try {
more = _bindingIter.next_n(batchsize, _bindingList);
counter = 0; // reset
} catch (Exception e) {
more = false;
NamingException ne = new NamingException(
"Problem getting binding list");
ne.setRootCause(e);
throw ne;
}
return more;
}
/**
* Constructs a JNDI Binding object from the COS Naming binding
* object.
* @exception NameNotFound No objects under the name.
* @exception CannotProceed Unable to obtain a continuation context
* @exception InvalidName Name not understood.
* @exception NamingException One of the above.
*/
private javax.naming.Binding mapBinding(org.omg.CosNaming.Binding bndg)
throws NamingException {
java.lang.Object obj = _ctx.callResolve(bndg.binding_name);
Name cname = CNNameParser.cosNameToName(bndg.binding_name);
try {
obj = NamingManager.getObjectInstance(obj, cname, _ctx, _env);
} catch (NamingException e) {
throw e;
} catch (Exception e) {
NamingException ne = new NamingException(
"problem generating object using object factory");
ne.setRootCause(e);
throw ne;
}
// Use cname.toString() instead of bindingName because the name
// in the binding should be a composite name
String cnameStr = cname.toString();
javax.naming.Binding jbndg = new javax.naming.Binding(cnameStr, obj);
NameComponent[] comps = _ctx.makeFullName(bndg.binding_name);
String fullName = CNNameParser.cosNameToInsString(comps);
jbndg.setNameInNamespace(fullName);
return jbndg;
}
}