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Posted to ojb-user@db.apache.org by Robert Giddings <r....@netcase.co.uk> on 2007/09/13 11:16:29 UTC
Overriding the ProxyList class
Hi,
Can anyone please tell me why this code doesn't seem to have an effect?
That is I get a class cast exception because an encrypted object for
example EncryptedCostCentre does not get decrypted to a CostCentre. Both
classes implement an interface called ICostCentre, but this interface
has no method signatures etc as the structure of the two classes is
different. I.e. CostCentre has getter/setters and EncryptedCostCentre
has an encrypt and decrypt methods.
The concept works fine, if I override the java.util.List methods and
encrypt and decrypt there, but this isn't really practical as I can
override methods such as indexOf(Object o) as they rely on equals.
The cypherMachine and encryptedClassType are set in the decrypt method
of the owner object, where a reference to the ICostCentre collection is
passed to the decrypted version of that object.
Also what changes am I likely to need to make to the afterStore method?
Thanks,
Robert Giddings
The code:
package com.netcase.database.ojb.proxy;
import java.lang.reflect.Method;
import java.util.Iterator;
import org.apache.ojb.broker.ManageableCollection;
import org.apache.ojb.broker.PBKey;
import org.apache.ojb.broker.PersistenceBroker;
import org.apache.ojb.broker.PersistenceBrokerException;
import org.apache.ojb.broker.core.proxy.ListProxyDefaultImpl;
import org.apache.ojb.broker.query.Query;
import com.netcase.encryption.CypherMachine;
public class EncryptableCollectionProxy extends ListProxyDefaultImpl {
private CypherMachine cypherMachine;
private Class encryptedClassType;
public EncryptableCollectionProxy(PBKey brokerKey,
java.lang.Class collClass, Query query) {
super(brokerKey, collClass, query);
cypherMachine = null;
encryptedClassType = null;
}
public EncryptableCollectionProxy(PBKey brokerKey, Query query)
{
super(brokerKey, query);
cypherMachine = null;
encryptedClassType = null;
}
/**
* @return the cypherMachine
*/
public CypherMachine getCypherMachine() {
return cypherMachine;
}
/**
* @param cypherMachine the cypherMachine to set
*/
public void setCypherMachine(CypherMachine cypherMachine) {
this.cypherMachine = cypherMachine;
}
/**
* @return the encryptedClassType
*/
public Class getEncryptedClassType() {
return encryptedClassType;
}
/**
* @param encryptedClassType the encryptedClassType to set
*/
public void setEncryptedClassType(Class encryptedClassType) {
this.encryptedClassType = encryptedClassType;
}
private Object decryptObject(Object o) {
try {
Method decrypt =
encryptedClassType.getMethod("decrypt", CypherMachine.class);
return decrypt.invoke(o, cypherMachine);
}
catch(Exception e) {
return null;
}
}
private Object encryptObject(Object o) {
try {
Method encrypt =
encryptedClassType.getMethod("encrypt", CypherMachine.class);
return encrypt.invoke(o, cypherMachine);
}
catch(Exception e) {
return null;
}
}
public void ojbAdd(Object anObject) {
super.ojbAdd(this.decryptObject(anObject));
}
public void ojbAddAll(ManageableCollection otherCollection) {
Iterator i = otherCollection.ojbIterator();
while(i.hasNext()) {
this.ojbAdd(i.next());
}
}
public Iterator ojbIterator() {
EncryptableCollectionProxy ecp =
new
EncryptableCollectionProxy(this.getBrokerKey(),
this.getCollectionClass(),
this.getQuery());
for(Object o: this) {
ecp.add(this.encryptObject(o));
}
return ecp.ojbIterator();
}
public void afterStore(PersistenceBroker broker) throws
PersistenceBrokerException {
super.afterStore(broker);
}
}
An example of the XDoclet code is:
/**
* @ojb.collection
element-class-ref="com.netcase.netspat.recordSystem.encryption.encrypted
Objects.EncryptedCostCentre"
* foreignkey="clientId"
* proxy="true"
* auto-retrieve="true"
* auto-update="none"
* auto-delete="none"
*/
private Collection<ICostCentre> costCentres;
Use of code:
public Client decrypt(CypherMachine cm) throws FailedDecryptionException
{
Client c = new Client(this.id);
try {
...
EncryptableCollectionProxy costCentresProxy =
(EncryptableCollectionProxy)costCentres;
costCentresProxy.setCypherMachine(cm);
costCentresProxy.setEncryptedClassType(EncryptedCostCentre.class);
c.setCostCentres(costCentresProxy);
...
return c;
} catch(Exception e) {
throw new FailedDecryptionException("Unable to
decrypt encrypted client: " + this.toString(), e);
}
}
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RE: Overriding the ProxyList class
Posted by Robert Giddings <r....@netcase.co.uk>.
Hi Armin,
I solved my problem. It was the protected method loadData() I needed to
override. It worked but suffered from infinite loop problems when
decrypting/encrypting because of a reference to the collection owner
object in each of the collection element objects. I have since looked at
other ideas and ways to resolve that issue.
Thanks,
Robert Giddings
-----Original Message-----
From: Armin Waibel [mailto:arminw@apache.org]
Sent: 15 September 2007 00:10
To: OJB Users List
Subject: Re: Overriding the ProxyList class
Hi Robert,
Robert Giddings wrote:
> The line " but this isn't really practical as I can
> override methods such as indexOf(Object o) as they rely on equals."
>
> Should read "can't override methods" because of relying on equals.
>
> Anyway, seems as if the ojb methods are never called as I put some
> System.out.println() statements in all the methods, and the
constructor
> and getter/setters get called OK, but the ojb methods never print out
> anything.
> Why would they never get called?
>
I think OJB doesn't know about the List proxy class or do you declare
this class as List/Collection/(Set) proxy in OJB.properties file?
You can't declare specific collection proxy classes per 1:n, m:n
reference only a general for all Collection, List and Set references.
regards,
Armin
> Robert Giddings
>
> -----Original Message-----
> From: Robert Giddings [mailto:r.giddings@netcase.co.uk]
> Sent: 13 September 2007 10:16
> To: 'OJB Users List'
> Subject: Overriding the ProxyList class
>
> Hi,
>
> Can anyone please tell me why this code doesn't seem to have an
effect?
> That is I get a class cast exception because an encrypted object for
> example EncryptedCostCentre does not get decrypted to a CostCentre.
Both
> classes implement an interface called ICostCentre, but this interface
> has no method signatures etc as the structure of the two classes is
> different. I.e. CostCentre has getter/setters and EncryptedCostCentre
> has an encrypt and decrypt methods.
> The concept works fine, if I override the java.util.List methods and
> encrypt and decrypt there, but this isn't really practical as I can
> override methods such as indexOf(Object o) as they rely on equals.
> The cypherMachine and encryptedClassType are set in the decrypt method
> of the owner object, where a reference to the ICostCentre collection
is
> passed to the decrypted version of that object.
> Also what changes am I likely to need to make to the afterStore
method?
>
> Thanks,
>
> Robert Giddings
>
>
> The code:
>
>
> package com.netcase.database.ojb.proxy;
>
> import java.lang.reflect.Method;
>
> import java.util.Iterator;
>
> import org.apache.ojb.broker.ManageableCollection;
> import org.apache.ojb.broker.PBKey;
> import org.apache.ojb.broker.PersistenceBroker;
> import org.apache.ojb.broker.PersistenceBrokerException;
> import org.apache.ojb.broker.core.proxy.ListProxyDefaultImpl;
> import org.apache.ojb.broker.query.Query;
>
> import com.netcase.encryption.CypherMachine;
>
> public class EncryptableCollectionProxy extends ListProxyDefaultImpl {
>
> private CypherMachine cypherMachine;
>
> private Class encryptedClassType;
>
> public EncryptableCollectionProxy(PBKey brokerKey,
> java.lang.Class collClass, Query query) {
> super(brokerKey, collClass, query);
> cypherMachine = null;
> encryptedClassType = null;
> }
>
> public EncryptableCollectionProxy(PBKey brokerKey, Query query)
> {
> super(brokerKey, query);
> cypherMachine = null;
> encryptedClassType = null;
> }
>
> /**
> * @return the cypherMachine
> */
> public CypherMachine getCypherMachine() {
> return cypherMachine;
> }
>
> /**
> * @param cypherMachine the cypherMachine to set
> */
> public void setCypherMachine(CypherMachine cypherMachine) {
> this.cypherMachine = cypherMachine;
> }
>
> /**
> * @return the encryptedClassType
> */
> public Class getEncryptedClassType() {
> return encryptedClassType;
> }
>
> /**
> * @param encryptedClassType the encryptedClassType to set
> */
> public void setEncryptedClassType(Class encryptedClassType) {
> this.encryptedClassType = encryptedClassType;
> }
>
> private Object decryptObject(Object o) {
> try {
> Method decrypt =
> encryptedClassType.getMethod("decrypt", CypherMachine.class);
> return decrypt.invoke(o, cypherMachine);
> }
> catch(Exception e) {
> return null;
> }
> }
>
> private Object encryptObject(Object o) {
> try {
> Method encrypt =
> encryptedClassType.getMethod("encrypt", CypherMachine.class);
> return encrypt.invoke(o, cypherMachine);
> }
> catch(Exception e) {
> return null;
> }
> }
>
> public void ojbAdd(Object anObject) {
> super.ojbAdd(this.decryptObject(anObject));
> }
>
> public void ojbAddAll(ManageableCollection otherCollection) {
> Iterator i = otherCollection.ojbIterator();
> while(i.hasNext()) {
> this.ojbAdd(i.next());
> }
> }
>
> public Iterator ojbIterator() {
> EncryptableCollectionProxy ecp =
> new
> EncryptableCollectionProxy(this.getBrokerKey(),
> this.getCollectionClass(),
> this.getQuery());
> for(Object o: this) {
> ecp.add(this.encryptObject(o));
> }
> return ecp.ojbIterator();
> }
>
> public void afterStore(PersistenceBroker broker) throws
> PersistenceBrokerException {
> super.afterStore(broker);
> }
>
> }
>
>
>
> An example of the XDoclet code is:
>
>
>
> /**
> * @ojb.collection
>
element-class-ref="com.netcase.netspat.recordSystem.encryption.encrypted
> Objects.EncryptedCostCentre"
> * foreignkey="clientId"
> * proxy="true"
> * auto-retrieve="true"
> * auto-update="none"
> * auto-delete="none"
> */
> private Collection<ICostCentre> costCentres;
>
>
>
>
> Use of code:
>
>
> public Client decrypt(CypherMachine cm) throws
FailedDecryptionException
> {
> Client c = new Client(this.id);
> try {
> ...
>
> EncryptableCollectionProxy costCentresProxy =
> (EncryptableCollectionProxy)costCentres;
> costCentresProxy.setCypherMachine(cm);
>
> costCentresProxy.setEncryptedClassType(EncryptedCostCentre.class);
> c.setCostCentres(costCentresProxy);
>
> ...
>
> return c;
> } catch(Exception e) {
> throw new FailedDecryptionException("Unable to
> decrypt encrypted client: " + this.toString(), e);
> }
> }
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: ojb-user-unsubscribe@db.apache.org
> For additional commands, e-mail: ojb-user-help@db.apache.org
>
>
>
>
---------------------------------------------------------------------
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Checked by AVG Free Edition.
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Re: Overriding the ProxyList class
Posted by Armin Waibel <ar...@apache.org>.
Hi Robert,
Robert Giddings wrote:
> The line " but this isn't really practical as I can
> override methods such as indexOf(Object o) as they rely on equals."
>
> Should read "can't override methods" because of relying on equals.
>
> Anyway, seems as if the ojb methods are never called as I put some
> System.out.println() statements in all the methods, and the constructor
> and getter/setters get called OK, but the ojb methods never print out
> anything.
> Why would they never get called?
>
I think OJB doesn't know about the List proxy class or do you declare
this class as List/Collection/(Set) proxy in OJB.properties file?
You can't declare specific collection proxy classes per 1:n, m:n
reference only a general for all Collection, List and Set references.
regards,
Armin
> Robert Giddings
>
> -----Original Message-----
> From: Robert Giddings [mailto:r.giddings@netcase.co.uk]
> Sent: 13 September 2007 10:16
> To: 'OJB Users List'
> Subject: Overriding the ProxyList class
>
> Hi,
>
> Can anyone please tell me why this code doesn't seem to have an effect?
> That is I get a class cast exception because an encrypted object for
> example EncryptedCostCentre does not get decrypted to a CostCentre. Both
> classes implement an interface called ICostCentre, but this interface
> has no method signatures etc as the structure of the two classes is
> different. I.e. CostCentre has getter/setters and EncryptedCostCentre
> has an encrypt and decrypt methods.
> The concept works fine, if I override the java.util.List methods and
> encrypt and decrypt there, but this isn't really practical as I can
> override methods such as indexOf(Object o) as they rely on equals.
> The cypherMachine and encryptedClassType are set in the decrypt method
> of the owner object, where a reference to the ICostCentre collection is
> passed to the decrypted version of that object.
> Also what changes am I likely to need to make to the afterStore method?
>
> Thanks,
>
> Robert Giddings
>
>
> The code:
>
>
> package com.netcase.database.ojb.proxy;
>
> import java.lang.reflect.Method;
>
> import java.util.Iterator;
>
> import org.apache.ojb.broker.ManageableCollection;
> import org.apache.ojb.broker.PBKey;
> import org.apache.ojb.broker.PersistenceBroker;
> import org.apache.ojb.broker.PersistenceBrokerException;
> import org.apache.ojb.broker.core.proxy.ListProxyDefaultImpl;
> import org.apache.ojb.broker.query.Query;
>
> import com.netcase.encryption.CypherMachine;
>
> public class EncryptableCollectionProxy extends ListProxyDefaultImpl {
>
> private CypherMachine cypherMachine;
>
> private Class encryptedClassType;
>
> public EncryptableCollectionProxy(PBKey brokerKey,
> java.lang.Class collClass, Query query) {
> super(brokerKey, collClass, query);
> cypherMachine = null;
> encryptedClassType = null;
> }
>
> public EncryptableCollectionProxy(PBKey brokerKey, Query query)
> {
> super(brokerKey, query);
> cypherMachine = null;
> encryptedClassType = null;
> }
>
> /**
> * @return the cypherMachine
> */
> public CypherMachine getCypherMachine() {
> return cypherMachine;
> }
>
> /**
> * @param cypherMachine the cypherMachine to set
> */
> public void setCypherMachine(CypherMachine cypherMachine) {
> this.cypherMachine = cypherMachine;
> }
>
> /**
> * @return the encryptedClassType
> */
> public Class getEncryptedClassType() {
> return encryptedClassType;
> }
>
> /**
> * @param encryptedClassType the encryptedClassType to set
> */
> public void setEncryptedClassType(Class encryptedClassType) {
> this.encryptedClassType = encryptedClassType;
> }
>
> private Object decryptObject(Object o) {
> try {
> Method decrypt =
> encryptedClassType.getMethod("decrypt", CypherMachine.class);
> return decrypt.invoke(o, cypherMachine);
> }
> catch(Exception e) {
> return null;
> }
> }
>
> private Object encryptObject(Object o) {
> try {
> Method encrypt =
> encryptedClassType.getMethod("encrypt", CypherMachine.class);
> return encrypt.invoke(o, cypherMachine);
> }
> catch(Exception e) {
> return null;
> }
> }
>
> public void ojbAdd(Object anObject) {
> super.ojbAdd(this.decryptObject(anObject));
> }
>
> public void ojbAddAll(ManageableCollection otherCollection) {
> Iterator i = otherCollection.ojbIterator();
> while(i.hasNext()) {
> this.ojbAdd(i.next());
> }
> }
>
> public Iterator ojbIterator() {
> EncryptableCollectionProxy ecp =
> new
> EncryptableCollectionProxy(this.getBrokerKey(),
> this.getCollectionClass(),
> this.getQuery());
> for(Object o: this) {
> ecp.add(this.encryptObject(o));
> }
> return ecp.ojbIterator();
> }
>
> public void afterStore(PersistenceBroker broker) throws
> PersistenceBrokerException {
> super.afterStore(broker);
> }
>
> }
>
>
>
> An example of the XDoclet code is:
>
>
>
> /**
> * @ojb.collection
> element-class-ref="com.netcase.netspat.recordSystem.encryption.encrypted
> Objects.EncryptedCostCentre"
> * foreignkey="clientId"
> * proxy="true"
> * auto-retrieve="true"
> * auto-update="none"
> * auto-delete="none"
> */
> private Collection<ICostCentre> costCentres;
>
>
>
>
> Use of code:
>
>
> public Client decrypt(CypherMachine cm) throws FailedDecryptionException
> {
> Client c = new Client(this.id);
> try {
> ...
>
> EncryptableCollectionProxy costCentresProxy =
> (EncryptableCollectionProxy)costCentres;
> costCentresProxy.setCypherMachine(cm);
>
> costCentresProxy.setEncryptedClassType(EncryptedCostCentre.class);
> c.setCostCentres(costCentresProxy);
>
> ...
>
> return c;
> } catch(Exception e) {
> throw new FailedDecryptionException("Unable to
> decrypt encrypted client: " + this.toString(), e);
> }
> }
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: ojb-user-unsubscribe@db.apache.org
> For additional commands, e-mail: ojb-user-help@db.apache.org
>
>
>
>
---------------------------------------------------------------------
To unsubscribe, e-mail: ojb-user-unsubscribe@db.apache.org
For additional commands, e-mail: ojb-user-help@db.apache.org
RE: Overriding the ProxyList class
Posted by Robert Giddings <r....@netcase.co.uk>.
The line " but this isn't really practical as I can
override methods such as indexOf(Object o) as they rely on equals."
Should read "can't override methods" because of relying on equals.
Anyway, seems as if the ojb methods are never called as I put some
System.out.println() statements in all the methods, and the constructor
and getter/setters get called OK, but the ojb methods never print out
anything.
Why would they never get called?
Robert Giddings
-----Original Message-----
From: Robert Giddings [mailto:r.giddings@netcase.co.uk]
Sent: 13 September 2007 10:16
To: 'OJB Users List'
Subject: Overriding the ProxyList class
Hi,
Can anyone please tell me why this code doesn't seem to have an effect?
That is I get a class cast exception because an encrypted object for
example EncryptedCostCentre does not get decrypted to a CostCentre. Both
classes implement an interface called ICostCentre, but this interface
has no method signatures etc as the structure of the two classes is
different. I.e. CostCentre has getter/setters and EncryptedCostCentre
has an encrypt and decrypt methods.
The concept works fine, if I override the java.util.List methods and
encrypt and decrypt there, but this isn't really practical as I can
override methods such as indexOf(Object o) as they rely on equals.
The cypherMachine and encryptedClassType are set in the decrypt method
of the owner object, where a reference to the ICostCentre collection is
passed to the decrypted version of that object.
Also what changes am I likely to need to make to the afterStore method?
Thanks,
Robert Giddings
The code:
package com.netcase.database.ojb.proxy;
import java.lang.reflect.Method;
import java.util.Iterator;
import org.apache.ojb.broker.ManageableCollection;
import org.apache.ojb.broker.PBKey;
import org.apache.ojb.broker.PersistenceBroker;
import org.apache.ojb.broker.PersistenceBrokerException;
import org.apache.ojb.broker.core.proxy.ListProxyDefaultImpl;
import org.apache.ojb.broker.query.Query;
import com.netcase.encryption.CypherMachine;
public class EncryptableCollectionProxy extends ListProxyDefaultImpl {
private CypherMachine cypherMachine;
private Class encryptedClassType;
public EncryptableCollectionProxy(PBKey brokerKey,
java.lang.Class collClass, Query query) {
super(brokerKey, collClass, query);
cypherMachine = null;
encryptedClassType = null;
}
public EncryptableCollectionProxy(PBKey brokerKey, Query query)
{
super(brokerKey, query);
cypherMachine = null;
encryptedClassType = null;
}
/**
* @return the cypherMachine
*/
public CypherMachine getCypherMachine() {
return cypherMachine;
}
/**
* @param cypherMachine the cypherMachine to set
*/
public void setCypherMachine(CypherMachine cypherMachine) {
this.cypherMachine = cypherMachine;
}
/**
* @return the encryptedClassType
*/
public Class getEncryptedClassType() {
return encryptedClassType;
}
/**
* @param encryptedClassType the encryptedClassType to set
*/
public void setEncryptedClassType(Class encryptedClassType) {
this.encryptedClassType = encryptedClassType;
}
private Object decryptObject(Object o) {
try {
Method decrypt =
encryptedClassType.getMethod("decrypt", CypherMachine.class);
return decrypt.invoke(o, cypherMachine);
}
catch(Exception e) {
return null;
}
}
private Object encryptObject(Object o) {
try {
Method encrypt =
encryptedClassType.getMethod("encrypt", CypherMachine.class);
return encrypt.invoke(o, cypherMachine);
}
catch(Exception e) {
return null;
}
}
public void ojbAdd(Object anObject) {
super.ojbAdd(this.decryptObject(anObject));
}
public void ojbAddAll(ManageableCollection otherCollection) {
Iterator i = otherCollection.ojbIterator();
while(i.hasNext()) {
this.ojbAdd(i.next());
}
}
public Iterator ojbIterator() {
EncryptableCollectionProxy ecp =
new
EncryptableCollectionProxy(this.getBrokerKey(),
this.getCollectionClass(),
this.getQuery());
for(Object o: this) {
ecp.add(this.encryptObject(o));
}
return ecp.ojbIterator();
}
public void afterStore(PersistenceBroker broker) throws
PersistenceBrokerException {
super.afterStore(broker);
}
}
An example of the XDoclet code is:
/**
* @ojb.collection
element-class-ref="com.netcase.netspat.recordSystem.encryption.encrypted
Objects.EncryptedCostCentre"
* foreignkey="clientId"
* proxy="true"
* auto-retrieve="true"
* auto-update="none"
* auto-delete="none"
*/
private Collection<ICostCentre> costCentres;
Use of code:
public Client decrypt(CypherMachine cm) throws FailedDecryptionException
{
Client c = new Client(this.id);
try {
...
EncryptableCollectionProxy costCentresProxy =
(EncryptableCollectionProxy)costCentres;
costCentresProxy.setCypherMachine(cm);
costCentresProxy.setEncryptedClassType(EncryptedCostCentre.class);
c.setCostCentres(costCentresProxy);
...
return c;
} catch(Exception e) {
throw new FailedDecryptionException("Unable to
decrypt encrypted client: " + this.toString(), e);
}
}
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Checked by AVG Free Edition.
Version: 7.5.485 / Virus Database: 269.13.16/1004 - Release Date:
12/09/2007 17:22
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