Hi,
I have a problem with JXPath which I suppose is something that is not
supported yet, though it's looks like a bug.
I'm using AbstractFactory implementation to create missing objects in XPath
when setting properties. (see
http://commons.apache.org/jxpath/users-guide.html#Creating_Objects).
Everything works fine as long as missing objects are Bean-like objects, or
any Collections. But if missing object is one of objects in Map<K,V>
problems begin. Here is my issue (please find complete code of used classes
and working example attached):
public class Parent {
private String name;
private Map<String, Child> children;
}
public class Child {
private String sex;
private int age;
}
public class JXPathMap {
public static void main (String[] args) {
Parent p = new Parent("Dad");
p.setChildren(new LinkedHashMap<String, Child>() {{
put("Bobby", new Child("Male", 9));
put("Steven", null);
put("Sandra", new Child("Female", 12));
}});
JXPathContext context = JXPathContext.newContext(p);
context.setFactory(new AbstractFactory() {
@Override
public boolean createObject(JXPathContext context, Pointer
pointer, Object parent, String name, int index) {
System.out.println("parent: " + parent);
System.out.println("name: " + name);
System.out.println("index: " + index);
return super.createObject(context, pointer, parent, name,
index);
}
});
context.createPathAndSetValue("children/Steven/age", 4);
}
}
*
*
this code results as following:
*parent: {Bobby=Child[sex=Male, age=9], Steven=null,
Sandra=Child[sex=Female, age=12]}
name: Steven
index: 0*
Exception in thread "main" org.apache.commons.jxpath.JXPathException:
Exception trying to create xpath children/Steven/age; Factory could not
create an object for path: /children[@name='Steven']
at
org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.createPathAndSetValue(JXPathContextReferenceImpl.java:549)
at
org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.createPathAndSetValue(JXPathContextReferenceImpl.java:533)
at tests.xpath.JXPathMap.main(JXPathMap.java:29)
Caused by: org.apache.commons.jxpath.JXPathAbstractFactoryException: Factory
could not create an object for path: /children[@name='Steven']
at
org.apache.commons.jxpath.ri.model.dynamic.DynamicPropertyPointer.createPath(DynamicPropertyPointer.java:230)
at
org.apache.commons.jxpath.ri.model.beans.NullPointer.createPath(NullPointer.java:100)
at
org.apache.commons.jxpath.ri.model.beans.NullPropertyPointer.createPath(NullPropertyPointer.java:138)
at
org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.setValue(JXPathContextReferenceImpl.java:584)
at
org.apache.commons.jxpath.ri.JXPathContextReferenceImpl.createPathAndSetValue(JXPathContextReferenceImpl.java:546)
... 2 more
*
*
I must mention that
*context.createPathAndSetValue("children/Bobby/age", 4)*works fine -
sets Bobby's age to 4. In case of missing object is element of
collection - everything works fine, I would get *Parent* as parent object, *
children* as property that has missing object and *index* so i know where to
put my newly created object.
In case of Map I don't get enough information to instantiate missing object.
"Steven" as property name is most surprising. Exception is OK, cause nothing
is created by factory.
I suppose that AbstractFactory should have separate method in case of Map
element is missed. JXPath easily detects that it is Map because setting *
"children/Bobby/age"* works as expected.
*
*I'm quite sure that I will post this to issue tracking system, but first
I'd like to ask if anybody had similar issue? may be i am missing something
important?
Any comments are appreciated.
Regards,
Aleksandr
package tests.xpath;
public class Child {
private String sex;
private int age;
Child() {}
Child(String sex, int age) { setSex(sex); setAge(age); }
public int getAge() { return age; }
public void setAge(int age) { this.age = age; }
public String getSex() { return sex; }
public void setSex(String sex) { this.sex = sex; }
@Override
public String toString() {
return this.getClass().getSimpleName() + "[" +
"sex=" + getSex() + ", " +
"age=" + getAge() +
"]";
}
}package tests.xpath;
import java.util.LinkedHashMap;
import org.apache.commons.jxpath.AbstractFactory;
import org.apache.commons.jxpath.JXPathContext;
import org.apache.commons.jxpath.Pointer;
public class JXPathMap {
public static void main (String[] args) {
Parent p = new Parent("Dad");
p.setChildren(new LinkedHashMap<String, Child>() {{
put("Bobby", new Child("Male", 9));
put("Steven", null);
put("Sandra", new Child("Female", 12));
}});
JXPathContext context = JXPathContext.newContext(p);
context.setFactory(new AbstractFactory() {
@Override
public boolean createObject(JXPathContext context, Pointer pointer, Object parent, String name, int index) {
System.out.println("parent: " + parent);
System.out.println("name: " + name);
System.out.println("index: " + index);
return super.createObject(context, pointer, parent, name, index);
}
});
context.createPathAndSetValue("children/Steven/age", 4);
}
}
package tests.xpath;
import java.util.Map;
public class Parent {
private String name;
private Map<String, Child> children;
Parent() {}
Parent(String name) { setName(name); }
public Map<String, Child> getChildren() { return children; }
public void setChildren(Map<String, Child> children) { this.children = children; }
public String getName() { return name; }
public void setName(String name) { this.name = name; }
@Override
public String toString() {
return this.getClass().getSimpleName() + "[" +
"name=" + getName() + ", " +
"children=" + getChildren() +
"]";
}
}
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