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Pointers represent locations of objects and their properties
in Java object graphs. JXPathContext has methods
(getPointer()
and (iteratePointers()
,
which, given an XPath, produce Pointers for the objects or properties
described the the path. For example, ctx.getPointer("foo/bar")
will produce a Pointer that can get and set the property "bar" of
the object which is the value of the property "foo" of the root object.
The value of ctx.getPointer("aMap/aKey[3]")
will be a pointer
to the 3'rd element of the array, which is the value for the key "aKey" of
the map, which is the value of the property "aMap" of the root object.
Method Summary | |
java.lang.String |
asPath()
Returns a string that is a proper "canonical" XPath that corresponds to this pointer. |
java.lang.Object |
getValue()
Returns the value of the object, property or collection element this pointer represents. |
void |
setValue(java.lang.Object value)
Modifies the value of the object, property or collection element this pointer represents. |
Method Detail |
public java.lang.Object getValue()
public void setValue(java.lang.Object value)
public java.lang.String asPath()
Pointer ptr = ctx.getPointer("//employees[firstName = 'John']")
The value of ptr.asPath()
will look something like
"/departments[2]/employees[3]"
, so, basically, it represents the
concrete location(s) of the result of a search performed by JXPath.
If an object in the pointer's path is a Dynamic Property object (like a Map),
the asPath method generates an XPath that looks like this:
"/departments[@name = 'HR']/employees[3]"
.
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