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Re: [eclipselink-users] [MOXy] additional xpath support
Hi Polly,

In general we recommend the SAXPlatform for performance reasons.  The SAXPlatform is used by default in OXM including our JAXB and SDO implementations

The DOMPlatform represents the approach taken to implement the first version of our object-to-XML runtime.  Originally an XPath library was used to get all of the data from XML.  As we worked on improving performance we added our own XPath engine, and eventually added event based processing represented by the SAXPlatform.

Some reasons you may want to consider the DOMPlatform:
  • Advanced XPath support (unmarshalling only) for mappings.  The javax.xml.xpath library (included since Java SE 5) is used to execute any XPaths not natively handled by EclipseLink MOXy.
  • Full access to DOM tree in XMLTransformationMapping, when the SAXPlatform is used you only have access to a sub-tree.
-Blaise

polly.c.chang wrote: 
cool!  Do you have any documentation that describes when users should choose
SAXPlatform vs. DOMPlatform?  I was using SAX because I thought the
DOMPlatform would be slower.  Is that a concern or do you recommend that
everyone uses DOMPlatform?

Thanks,
Polly


Blaise Doughan wrote:
  
Hi Polly,

There is actually already unmarshal support for these types of XPaths if 
you use our DOMPlatform.  I have attached an example, in this example 
one of the mappings has the following XPath:

    
addressMapping.setXPath("//ns:customer/ns:phone-number/preceding-sibling::*[1]");

Note you will need the fix for bug #298114, this fix will be available 
in the 2.0.1 and 2.1 nightly builds starting tomorrow (Dec 18).

https://bugs.eclipse.org/bugs/show_bug.cgi?id=298114

-Blaise

polly.c.chang wrote:
    
Hi,

I don't believe that MOXy currently supports these two features:

1. Support for preceding-sibling and following-sibling axis. This is
necessary so that we can check for a following-sibling of an ID with the
name VersionID.

2. Support for position() and false() functions. 

Would it be possible to add these?

Thanks!
--Polly



  
      
/*******************************************************************************
* Copyright (c) 1998, 2009 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution
License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at
http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
*     bdoughan - December 17/2009 - 2.0.1 - Initial implementation
******************************************************************************/
package org.eclipse.persistence.testing.oxm.mappings.advancedxpath;

import org.eclipse.persistence.oxm.NamespaceResolver;
import org.eclipse.persistence.oxm.XMLDescriptor;
import org.eclipse.persistence.oxm.XMLLogin;
import org.eclipse.persistence.oxm.mappings.XMLCompositeObjectMapping;
import org.eclipse.persistence.oxm.mappings.XMLDirectMapping;
import org.eclipse.persistence.oxm.platform.DOMPlatform;
import org.eclipse.persistence.sessions.Project;

public class CustomerProject extends Project {

    public CustomerProject() {
        XMLLogin xmlLogin = new XMLLogin();
        xmlLogin.setDatasourcePlatform(new DOMPlatform());
        this.setDatasourceLogin(xmlLogin);

        this.addDescriptor(getCustomerDescriptor());
        this.addDescriptor(getAddressDescriptor());
    }

    private XMLDescriptor getCustomerDescriptor() {
        XMLDescriptor xmlDescriptor = new XMLDescriptor();
        xmlDescriptor.setJavaClass(Customer.class);
        xmlDescriptor.setDefaultRootElement("ns:customer");

        NamespaceResolver nsResolver = new NamespaceResolver();
        nsResolver.put("ns", "urn:example");
        xmlDescriptor.setNamespaceResolver(nsResolver);

        XMLCompositeObjectMapping addressMapping = new
XMLCompositeObjectMapping();
        addressMapping.setAttributeName("address");
       
addressMapping.setXPath("//ns:customer/ns:phone-number/preceding-sibling::*[1]");
        addressMapping.setReferenceClass(Address.class);
        xmlDescriptor.addMapping(addressMapping);

        return xmlDescriptor;
    }

    private XMLDescriptor getAddressDescriptor() {
        XMLDescriptor xmlDescriptor = new XMLDescriptor();
        xmlDescriptor.setJavaClass(Address.class);

        NamespaceResolver nsResolver = new NamespaceResolver();
        nsResolver.put("ns", "urn:example");
        xmlDescriptor.setNamespaceResolver(nsResolver);

        XMLDirectMapping streetMapping = new XMLDirectMapping();
        streetMapping.setAttributeName("street");
        streetMapping.setXPath("text()");
        xmlDescriptor.addMapping(streetMapping);

        return xmlDescriptor;
    }

}
/*******************************************************************************
* Copyright (c) 1998, 2009 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution
License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at
http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
*     bdoughan - December 17/2009 - 2.0.1 - Initial implementation
******************************************************************************/
package org.eclipse.persistence.testing.oxm.mappings.advancedxpath;

public class Address {

    private String street;

    public String getStreet() {
        return street;
    }

    public void setStreet(String street) {
        this.street = street;
    }

    public boolean equals(Object object) {
        try {
            if(null == object) {
                return false;
            }
            Address testAddress = (Address) object;
            if(null == street) {
                return null == testAddress.getStreet();
            } else {
                return street.equals(testAddress.getStreet());
            }
        } catch(ClassCastException e) {
            return false;
        }
    }

    public String toString() {
        String string = "Address(street=";
        if(null == street) {
            string += null;
        } else {
            string += "'" + street + "'";
        }
        return string += ")";
    }

}
/*******************************************************************************
* Copyright (c) 1998, 2009 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution
License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at
http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
*     bdoughan - December 17/2009 - 2.0.1 - Initial implementation
******************************************************************************/
package org.eclipse.persistence.testing.oxm.mappings.advancedxpath;

public class Customer {

    private Address address;

    public Address getAddress() {
        return address;
    }

    public void setAddress(Address address) {
        this.address = address;
    }

    public boolean equals(Object object) {
        try {
            if(null == object) {
                return false;
            }
            Customer testCustomer = (Customer) object;
            if(null == address) {
                return null == testCustomer.getAddress();
            } else {
                return address.equals(testCustomer.getAddress());
            }
        } catch(ClassCastException e) {
            return false;
        }
    }

    public String toString() {
        String string = "Customer(address=";
        if(null == address) {
            string += null;
        } else {
            string += address.toString();
        }
        return string += ")";
    }

}
<ns:customer xmlns:ns="urn:example">
    <ns:address>Wrong Street</ns:address>
    <ns:address>Right Street</ns:address>
    <ns:phone-number/>
    <ns:address>Wrong Street</ns:address>
</ns:customer>
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