Re: Both sides of M:N mapping not correctly retrieved in rc7
Armin:
Thanks a lot for the help. It works now. In addition to what you
pointed out, I also had a bug on my side related to interfaces and extents
that caused OJB to get confused when connecting collections.
thanks again,
Brad
I also noticed the problem with the
At 08:32 PM 6/23/2004 +0200, you wrote:
Hi Brad,
good news! Seems to work.
I checked in a new test case show how to use PB-api to
store/retrieve/delete object hierarchies via m:n relation with different
collection-descriptor auto-xxx settings.
Main difference to your test is that I use two table (one for tree object,
the other as indirection table). But it should also be possible to map
this stuff in one table (not recommended IMO, because it will mix
different types of rows).
The test is called M2NGraphTest.java (see test-suite, [db-ojb]/src/test)
and is a little different from yours, but following the example should
make work your test too.
http://cvs.apache.org/viewcvs.cgi/db-ojb/src/test/org/apache/ojb/broker/M2NGraphTest.java?rev=1.1view=markup
The metadata mapping can be found in
src/test/org/apache/ojb repository_junit_reference.xml
By the way, your wrapper methods addEntity, linkEntity use different PB
instances, thus two connections will be used. If linkEntity fails the
changes made in addEntity will not be rollback. And you don't close the
used PB instance.
But maybe you override this methods in your wrapper too, so my notice is
wrong ;-)
regards,
Armin
Bradford Pielech wrote:
yeah, those are basically wrappers to underlying broker methods.
The addEntity method is a wrapper for the following method that accesses
the persistence broker:
public boolean addEntity(SimpleDagNode nodeA) throws Exception {
PersistenceBroker pbroker =
PersistenceBrokerFactory.defaultPersistenceBroker();
pbroker.beginTransaction();
pbroker.store(nodeA, modificationType);
pbroker.commitTransaction();
return true;
and broker.linkEntity is implemented as follows:
public void linkEntity(SimpleDagNode parent, SimpleDagNode child)
throws Exception {
if(!parent.getChildren().contains(child)){
parent.addChild(child);
}
PersistenceBroker pbroker =
PersistenceBrokerFactory.defaultPersistenceBroker();
pbroker.beginTransaction();
pbroker.serviceBrokerHelper().link(o, false);
pbroker.commitTransaction();
}
At 03:05 PM 6/23/2004 +0200, you wrote:
seems you use an user specific PersistenceBroker implementation, can you
post methods
broker.addEntity(nodeA);
broker.linkEntity(nodeA, nodeB);
too.
regards,
Armin
Bradford Pielech wrote:
Oops, just realized there was a logic bug in the junit test that makes
the code incorrect because I had to quickly rewrite the test to remove
unneeded subclasses and such. Here is the correct version:
public void testAddNewChild() throws Exception {
SimpleDAGNode nodeA = new nodeANode();
SimpleDAGNode nodeB = new nodeBNode();
//store nodeA first
broker.addEntity(nodeA);
//then store the nodeB
broker.addEntity(nodeB);
//make A the parent of B because they are not linked in the code
automatically
broker.linkEntity(nodeA, nodeB);
SimpleDAGNode retrievednodeB = broker.getEntity(nodeB.getID());
assertNotNull(Verifying the nodeB was retrieved, retrievednodeB);
SimpleDAGNode retrievednodeA = (SimpleDAGNode)
retrievednodeB.getParentAt(0);
assertEquals(verify the nodeA was stored, nodeA.getID(),
retrievednodeA.getEboId());
assertEquals(verify the retrieved nodeA has 1 child (the nodeB), 1,
retrievednodeA.getChildCount());
assertEquals(verify the retrieved nodeB has 1 parent (the nodeA), 1,
retrievednodeB.getParentCount());
assertEquals(
verify, using hashcode, that the nodeB's parent is the nodeA,
retrievednodeA.hashCode(),
retrievednodeB.getParentAt(0).hashCode());
for (Iterator i = retrievednodeA.getChildren().iterator();
i.hasNext(); ) {
Object o = i.next();
//this next test fails because the child is null
assertNotNull(Verifying nodeA's children are not null, o);
assertEquals(
verify, using hashcode, that the nodeAs child is the nodeB,
retrievednodeB.hashCode(), o.hashCode());
}
}
At 08:18 AM 6/23/2004 -0400, you wrote:
Armin:
Sure, no problem. Apologies for the formatting, but the basic
idea should be clear. I also attached my OJB.properties and
repository_user.xml.
thanks!
Brad
SimpleDagNode class:
---
public class SimpleDAGNode{
private List children;
private String ID;
private List parents;
public SimpleDAGNode() {
ID = ;
parents = new Vector();
children = new Vector();
}
public String getID() {
return ID;
}
public void addChildNode(DAGNode child) {
// Cannot add same
Re: Both sides of M:N mapping not correctly retrieved in rc7
Hi Brad, could you please send a junit test or a code snip to reproduce this behavior? I will integrate your test to test-suite. regards, Armin Bradford Pielech wrote: Hello again: I have encountered an issue with the recursive graph structure that I asked about a couple of weeks ago. Below is a snippet from the repository.xml. Basically I have a DAGNode that has a list of parents and a list of children. I am able to get everything loaded in OJB correctly, however I have a problem when I retrieve the objects. Say, I have a DAGNode A and B where A is the parent and B is the child. I then store A and B in the DB. When I retrieve A, A's child list correctly has B, but B's parent list contains 1 object that is null. So if I call B.getParents().size(), it returns 1, but the only value in there is a null. Conversely, if I retrieve B, B's parent list is correct, but A's child list has 1 entry that is a null. Any ideas what is going on? thanks! Brad repository_user.xml class-descriptor class=SimpleDAGNode table=effect field-descriptor name=ID column=ebo_id jdbc-type=VARCHAR primarykey=true length=35 /field-descriptor collection-descriptor name=children collection-class=org.apache.ojb.broker.util.collections.ManageableArrayList element-class-ref=SimpleDAGNode indirection-table=parent_children_table auto-retrieve=true auto-update=none auto-delete=none fk-pointing-to-this-class column=parent_id/ fk-pointing-to-element-class column=child_id/ /collection-descriptor collection-descriptor name=parents element-class-ref=SimpleDAGNode collection-class=org.apache.ojb.broker.util.collections.ManageableArrayList indirection-table=parent_children_table auto-retrieve=true auto-update=none auto-delete=none fk-pointing-to-this-class column=child_id/ fk-pointing-to-element-class column=parent_id/ /collection-descriptor /class-descriptor Relevant other settings: PersistentFieldClass=org.apache.ojb.broker.metadata.fieldaccess.PersistentFieldDirectAccessImpl ObjectCacheClass=org.apache.ojb.broker.cache.ObjectCachePerBrokerImpl using rc7 downloaded from website - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Both sides of M:N mapping not correctly retrieved in rc7
Armin:
Sure, no problem. Apologies for the formatting, but the basic idea should
be clear. I also attached my OJB.properties and repository_user.xml.
thanks!
Brad
SimpleDagNode class:
---
public class SimpleDAGNode{
private List children;
private String ID;
private List parents;
public SimpleDAGNode() {
ID = ;
parents = new Vector();
children = new Vector();
}
public String getID() {
return ID;
}
public void addChildNode(DAGNode child) {
// Cannot add same child twice
if (!children.contains(child)) {
children.add(child);
if (!child.getParents().contains(this)) {
child.getParents().add(this);
}
}
}
public void removeChild(DAGNode child) {
children.remove(child);
child.getParents().remove(this);
}
public List getParents() {
return parents;
}
public List getChildren() {
return children;
}
public boolean equals(Object ref) {
if (ref == null) {
return false;
}
if (ref instanceof SimpleDagNode) {
return (getID().equals( ( (SimpleDagNode) ref).getID()));
}
else {
return false;
}
}
}
---
Junit Test:
public void testAddNewChild() throws Exception {
logger.info(Testing persisting a relationship);
SimpleDagNode nodeA = new SimpleDagNode();
SimpleDagNode nodeB = new SimpleDagNode();
//store nodeA first
broker.addEntity(nodeA);
//then store the nodeB
broker.addEntity(nodeB );
broker.linkEntity(nodeA, nodeB);
SimpleDagNode retrievedA = broker.retrieve(nodeA.getID());
SimpleDagNode retrievedB = (SimpleDagNode) retrievedA.getParents().get(0);
assertEquals(verify the nodeA was stored, nodeA.getD(),
retrievedA .getID());
assertEquals(verify the retrieved A has 1 child, 1,
retrievedA.getChildren().size());
assertEquals(verify the retrieved B has 1 parent, 1,
retrievedB .getParents().get(0));
assertEquals(
verify, using hashcode, that the B's parent is A,
retrievedA.hashCode(),
retrievedB.getParents().get(0).hashCode());
for (Iterator i = retrievedA.getChildren().iterator(); i.hasNext(); ) {
Object o = i.next();
/**
* This next line fails. Even though A has 1 child (verified
above), its child is null
*/
assertNotNull(Verifying A's children are not null,
o);
assertEquals(
verify, using hashcode, that the A's child is B,
retrievedB.hashCode(), o.hashCode());
}
}
#!--
#/* Copyright 2002-2004 The Apache Software Foundation
# *
# * Licensed 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.
# */
#--
# OJB.properties -- configuration of the OJB runtime environment
# Version: 1.0
# (c) 2001, 2002, 2003 Apache Software Foundation
# Author: Thomas Mahler and many others
# @version $Id: OJB.properties,v 1.70 2004/06/03 23:46:08 arminw Exp $
#
#
# repository file settings
#
# The repositoryFile entry tells OJB to use this file as as its standard mapping
# repository. The file is looked up from the classpath.
#
repositoryFile=ojb//repository.xml
#
# If the useSerializedRepository entry is set to true, OJB tries to load a
# serialized version of the repository for performance reasons.
# if set to false, OJB always loads the xml file.
# Setting this flag to true will accelerate the startup sequence of OJB.
# If set to true changes to the repository.xml file will only be detected
# after maually deleting the repository.xml.serialized file.
useSerializedRepository=false
#
# If Repository serialization is used the entry serializedRepositoryPath defines the
# directory where the Repository is written to and read from.
# this entry is used only when the useSerializedRepository flag is set to true
#
serializedRepositoryPath=.
#
#
# PersistenceBrokerFactory / PersistenceBroker
#
# The PersistenceBrokerFactoryClass entry decides which concrete
# PersistenceBrokerFactory implemention is to be used.
Re: Both sides of M:N mapping not correctly retrieved in rc7
Oops, just realized there was a logic bug in the junit test that makes the
code incorrect because I had to quickly rewrite the test to remove unneeded
subclasses and such. Here is the correct version:
public void testAddNewChild() throws Exception {
SimpleDAGNode nodeA = new nodeANode();
SimpleDAGNode nodeB = new nodeBNode();
//store nodeA first
broker.addEntity(nodeA);
//then store the nodeB
broker.addEntity(nodeB);
//make A the parent of B because they are not linked in the code
automatically
broker.linkEntity(nodeA, nodeB);
SimpleDAGNode retrievednodeB = broker.getEntity(nodeB.getID());
assertNotNull(Verifying the nodeB was retrieved, retrievednodeB);
SimpleDAGNode retrievednodeA = (SimpleDAGNode)
retrievednodeB.getParentAt(0);
assertEquals(verify the nodeA was stored, nodeA.getID(),
retrievednodeA.getEboId());
assertEquals(verify the retrieved nodeA has 1 child (the nodeB), 1,
retrievednodeA.getChildCount());
assertEquals(verify the retrieved nodeB has 1 parent (the nodeA), 1,
retrievednodeB.getParentCount());
assertEquals(
verify, using hashcode, that the nodeB's parent is the nodeA,
retrievednodeA.hashCode(),
retrievednodeB.getParentAt(0).hashCode());
for (Iterator i = retrievednodeA.getChildren().iterator();
i.hasNext(); ) {
Object o = i.next();
//this next test fails because the child is null
assertNotNull(Verifying nodeA's children are not null, o);
assertEquals(
verify, using hashcode, that the nodeAs child is the nodeB,
retrievednodeB.hashCode(), o.hashCode());
}
}
At 08:18 AM 6/23/2004 -0400, you wrote:
Armin:
Sure, no problem. Apologies for the formatting, but the basic
idea should be clear. I also attached my OJB.properties and
repository_user.xml.
thanks!
Brad
SimpleDagNode class:
---
public class SimpleDAGNode{
private List children;
private String ID;
private List parents;
public SimpleDAGNode() {
ID = ;
parents = new Vector();
children = new Vector();
}
public String getID() {
return ID;
}
public void addChildNode(DAGNode child) {
// Cannot add same child twice
if (!children.contains(child)) {
children.add(child);
if (!child.getParents().contains(this)) {
child.getParents().add(this);
}
}
}
public void removeChild(DAGNode child) {
children.remove(child);
child.getParents().remove(this);
}
public List getParents() {
return parents;
}
public List getChildren() {
return children;
}
public boolean equals(Object ref) {
if (ref == null) {
return false;
}
if (ref instanceof SimpleDagNode) {
return (getID().equals( ( (SimpleDagNode) ref).getID()));
}
else {
return false;
}
}
}
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Re: Both sides of M:N mapping not correctly retrieved in rc7
seems you use an user specific PersistenceBroker implementation, can you
post methods
broker.addEntity(nodeA);
broker.linkEntity(nodeA, nodeB);
too.
regards,
Armin
Bradford Pielech wrote:
Oops, just realized there was a logic bug in the junit test that makes
the code incorrect because I had to quickly rewrite the test to remove
unneeded subclasses and such. Here is the correct version:
public void testAddNewChild() throws Exception {
SimpleDAGNode nodeA = new nodeANode();
SimpleDAGNode nodeB = new nodeBNode();
//store nodeA first
broker.addEntity(nodeA);
//then store the nodeB
broker.addEntity(nodeB);
//make A the parent of B because they are not linked in the code
automatically
broker.linkEntity(nodeA, nodeB);
SimpleDAGNode retrievednodeB = broker.getEntity(nodeB.getID());
assertNotNull(Verifying the nodeB was retrieved, retrievednodeB);
SimpleDAGNode retrievednodeA = (SimpleDAGNode)
retrievednodeB.getParentAt(0);
assertEquals(verify the nodeA was stored, nodeA.getID(),
retrievednodeA.getEboId());
assertEquals(verify the retrieved nodeA has 1 child (the nodeB), 1,
retrievednodeA.getChildCount());
assertEquals(verify the retrieved nodeB has 1 parent (the nodeA), 1,
retrievednodeB.getParentCount());
assertEquals(
verify, using hashcode, that the nodeB's parent is the nodeA,
retrievednodeA.hashCode(),
retrievednodeB.getParentAt(0).hashCode());
for (Iterator i = retrievednodeA.getChildren().iterator();
i.hasNext(); ) {
Object o = i.next();
//this next test fails because the child is null
assertNotNull(Verifying nodeA's children are not null, o);
assertEquals(
verify, using hashcode, that the nodeAs child is the nodeB,
retrievednodeB.hashCode(), o.hashCode());
}
}
At 08:18 AM 6/23/2004 -0400, you wrote:
Armin:
Sure, no problem. Apologies for the formatting, but the basic
idea should be clear. I also attached my OJB.properties and
repository_user.xml.
thanks!
Brad
SimpleDagNode class:
---
public class SimpleDAGNode{
private List children;
private String ID;
private List parents;
public SimpleDAGNode() {
ID = ;
parents = new Vector();
children = new Vector();
}
public String getID() {
return ID;
}
public void addChildNode(DAGNode child) {
// Cannot add same child twice
if (!children.contains(child)) {
children.add(child);
if (!child.getParents().contains(this)) {
child.getParents().add(this);
}
}
}
public void removeChild(DAGNode child) {
children.remove(child);
child.getParents().remove(this);
}
public List getParents() {
return parents;
}
public List getChildren() {
return children;
}
public boolean equals(Object ref) {
if (ref == null) {
return false;
}
if (ref instanceof SimpleDagNode) {
return (getID().equals( ( (SimpleDagNode) ref).getID()));
}
else {
return false;
}
}
}
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Re: Both sides of M:N mapping not correctly retrieved in rc7
yeah, those are basically wrappers to underlying broker methods.
The addEntity method is a wrapper for the following method that accesses
the persistence broker:
public boolean addEntity(SimpleDagNode nodeA) throws Exception {
PersistenceBroker pbroker =
PersistenceBrokerFactory.defaultPersistenceBroker();
pbroker.beginTransaction();
pbroker.store(nodeA, modificationType);
pbroker.commitTransaction();
return true;
and broker.linkEntity is implemented as follows:
public void linkEntity(SimpleDagNode parent, SimpleDagNode child) throws
Exception {
if(!parent.getChildren().contains(child)){
parent.addChild(child);
}
PersistenceBroker pbroker =
PersistenceBrokerFactory.defaultPersistenceBroker();
pbroker.beginTransaction();
pbroker.serviceBrokerHelper().link(o, false);
pbroker.commitTransaction();
}
At 03:05 PM 6/23/2004 +0200, you wrote:
seems you use an user specific PersistenceBroker implementation, can you
post methods
broker.addEntity(nodeA);
broker.linkEntity(nodeA, nodeB);
too.
regards,
Armin
Bradford Pielech wrote:
Oops, just realized there was a logic bug in the junit test that makes
the code incorrect because I had to quickly rewrite the test to remove
unneeded subclasses and such. Here is the correct version:
public void testAddNewChild() throws Exception {
SimpleDAGNode nodeA = new nodeANode();
SimpleDAGNode nodeB = new nodeBNode();
//store nodeA first
broker.addEntity(nodeA);
//then store the nodeB
broker.addEntity(nodeB);
//make A the parent of B because they are not linked in the code
automatically
broker.linkEntity(nodeA, nodeB);
SimpleDAGNode retrievednodeB = broker.getEntity(nodeB.getID());
assertNotNull(Verifying the nodeB was retrieved, retrievednodeB);
SimpleDAGNode retrievednodeA = (SimpleDAGNode)
retrievednodeB.getParentAt(0);
assertEquals(verify the nodeA was stored, nodeA.getID(),
retrievednodeA.getEboId());
assertEquals(verify the retrieved nodeA has 1 child (the nodeB), 1,
retrievednodeA.getChildCount());
assertEquals(verify the retrieved nodeB has 1 parent (the nodeA), 1,
retrievednodeB.getParentCount());
assertEquals(
verify, using hashcode, that the nodeB's parent is the nodeA,
retrievednodeA.hashCode(),
retrievednodeB.getParentAt(0).hashCode());
for (Iterator i = retrievednodeA.getChildren().iterator();
i.hasNext(); ) {
Object o = i.next();
//this next test fails because the child is null
assertNotNull(Verifying nodeA's children are not null, o);
assertEquals(
verify, using hashcode, that the nodeAs child is the nodeB,
retrievednodeB.hashCode(), o.hashCode());
}
}
At 08:18 AM 6/23/2004 -0400, you wrote:
Armin:
Sure, no problem. Apologies for the formatting, but the basic
idea should be clear. I also attached my OJB.properties and
repository_user.xml.
thanks!
Brad
SimpleDagNode class:
---
public class SimpleDAGNode{
private List children;
private String ID;
private List parents;
public SimpleDAGNode() {
ID = ;
parents = new Vector();
children = new Vector();
}
public String getID() {
return ID;
}
public void addChildNode(DAGNode child) {
// Cannot add same child twice
if (!children.contains(child)) {
children.add(child);
if (!child.getParents().contains(this)) {
child.getParents().add(this);
}
}
}
public void removeChild(DAGNode child) {
children.remove(child);
child.getParents().remove(this);
}
public List getParents() {
return parents;
}
public List getChildren() {
return children;
}
public boolean equals(Object ref) {
if (ref == null) {
return false;
}
if (ref instanceof SimpleDagNode) {
return (getID().equals( ( (SimpleDagNode) ref).getID()));
}
else {
return false;
}
}
}
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To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
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To unsubscribe, e-mail: [EMAIL PROTECTED]
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Re: Both sides of M:N mapping not correctly retrieved in rc7
Hi Brad,
good news! Seems to work.
I checked in a new test case show how to use PB-api to
store/retrieve/delete object hierarchies via m:n relation with different
collection-descriptor auto-xxx settings.
Main difference to your test is that I use two table (one for tree
object, the other as indirection table). But it should also be possible
to map this stuff in one table (not recommended IMO, because it will mix
different types of rows).
The test is called M2NGraphTest.java (see test-suite,
[db-ojb]/src/test) and is a little different from yours, but following
the example should make work your test too.
http://cvs.apache.org/viewcvs.cgi/db-ojb/src/test/org/apache/ojb/broker/M2NGraphTest.java?rev=1.1view=markup
The metadata mapping can be found in
src/test/org/apache/ojb repository_junit_reference.xml
By the way, your wrapper methods addEntity, linkEntity use different PB
instances, thus two connections will be used. If linkEntity fails the
changes made in addEntity will not be rollback. And you don't close the
used PB instance.
But maybe you override this methods in your wrapper too, so my notice is
wrong ;-)
regards,
Armin
Bradford Pielech wrote:
yeah, those are basically wrappers to underlying broker methods.
The addEntity method is a wrapper for the following method that accesses
the persistence broker:
public boolean addEntity(SimpleDagNode nodeA) throws Exception {
PersistenceBroker pbroker =
PersistenceBrokerFactory.defaultPersistenceBroker();
pbroker.beginTransaction();
pbroker.store(nodeA, modificationType);
pbroker.commitTransaction();
return true;
and broker.linkEntity is implemented as follows:
public void linkEntity(SimpleDagNode parent, SimpleDagNode child)
throws Exception {
if(!parent.getChildren().contains(child)){
parent.addChild(child);
}
PersistenceBroker pbroker =
PersistenceBrokerFactory.defaultPersistenceBroker();
pbroker.beginTransaction();
pbroker.serviceBrokerHelper().link(o, false);
pbroker.commitTransaction();
}
At 03:05 PM 6/23/2004 +0200, you wrote:
seems you use an user specific PersistenceBroker implementation, can
you post methods
broker.addEntity(nodeA);
broker.linkEntity(nodeA, nodeB);
too.
regards,
Armin
Bradford Pielech wrote:
Oops, just realized there was a logic bug in the junit test that
makes the code incorrect because I had to quickly rewrite the test to
remove unneeded subclasses and such. Here is the correct version:
public void testAddNewChild() throws Exception {
SimpleDAGNode nodeA = new nodeANode();
SimpleDAGNode nodeB = new nodeBNode();
//store nodeA first
broker.addEntity(nodeA);
//then store the nodeB
broker.addEntity(nodeB);
//make A the parent of B because they are not linked in the code
automatically
broker.linkEntity(nodeA, nodeB);
SimpleDAGNode retrievednodeB = broker.getEntity(nodeB.getID());
assertNotNull(Verifying the nodeB was retrieved, retrievednodeB);
SimpleDAGNode retrievednodeA = (SimpleDAGNode)
retrievednodeB.getParentAt(0);
assertEquals(verify the nodeA was stored, nodeA.getID(),
retrievednodeA.getEboId());
assertEquals(verify the retrieved nodeA has 1 child (the
nodeB), 1,
retrievednodeA.getChildCount());
assertEquals(verify the retrieved nodeB has 1 parent (the
nodeA), 1,
retrievednodeB.getParentCount());
assertEquals(
verify, using hashcode, that the nodeB's parent is the nodeA,
retrievednodeA.hashCode(),
retrievednodeB.getParentAt(0).hashCode());
for (Iterator i = retrievednodeA.getChildren().iterator();
i.hasNext(); ) {
Object o = i.next();
//this next test fails because the child is null
assertNotNull(Verifying nodeA's children are not null, o);
assertEquals(
verify, using hashcode, that the nodeAs child is the nodeB,
retrievednodeB.hashCode(), o.hashCode());
}
}
At 08:18 AM 6/23/2004 -0400, you wrote:
Armin:
Sure, no problem. Apologies for the formatting, but the
basic idea should be clear. I also attached my OJB.properties and
repository_user.xml.
thanks!
Brad
SimpleDagNode class:
---
public class SimpleDAGNode{
private List children;
private String ID;
private List parents;
public SimpleDAGNode() {
ID = ;
parents = new Vector();
children = new Vector();
}
public String getID() {
return ID;
}
public void addChildNode(DAGNode child) {
// Cannot add same child twice
if (!children.contains(child)) {
children.add(child);
if (!child.getParents().contains(this)) {
child.getParents().add(this);
}
}
}
public void removeChild(DAGNode child) {
children.remove(child);
child.getParents().remove(this);
}
public List
