Package org.apache.commons.jxpath

Interface Pointer

All Superinterfaces:
Cloneable, Comparable, Serializable
All Known Implementing Classes:
BeanPointer, BeanPropertyPointer, CollectionPointer, ContainerPointer, DOMAttributePointer, DOMNodePointer, DynaBeanPointer, DynaBeanPropertyPointer, DynamicPointer, DynamicPropertyPointer, JDOMAttributePointer, JDOMNamespacePointer, JDOMNodePointer, LangAttributePointer, NamespacePointer, NodePointer, NullElementPointer, NullPointer, NullPropertyPointer, PropertyOwnerPointer, PropertyPointer, VariablePointer
public interface Pointer extends Cloneable, Comparable, Serializable
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 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

    Modifier and Type
    Method
    Description
    String
    asPath()
    Returns a string that is a proper "canonical" XPath that corresponds to this pointer.
    Object
    clone()
    Pointers are cloneable.
    Object
    getNode()
    Returns the raw value of the object, property or collection element this pointer represents.
    Object
    getRootNode()
    Returns the node this pointer is based on.
    Object
    getValue()
    Returns the value of the object, property or collection element this pointer represents.
    void
    setValue(Object value)
    Modifies the value of the object, property or collection element this pointer represents.

    Methods inherited from interface java.lang.Comparable

    compareTo

  • Method Details

    • asPath

      String asPath()
      Returns a string that is a proper "canonical" XPath that corresponds to this pointer. Consider this example:

      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]".

      Returns:
      String path

    • clone

      Object clone()
      Pointers are cloneable.
      Returns:
      cloned Object

    • getNode

      Object getNode()
      Returns the raw value of the object, property or collection element this pointer represents. Never converts the object to a canonical type: returns it as is.

      For example, for an XML element, getNode() will return the element itself rather than the text it contains.

      Returns:
      Object node

    • getRootNode

      Object getRootNode()
      Returns the node this pointer is based on.
      Returns:
      Object

    • getValue

      Object getValue()
      Returns the value of the object, property or collection element this pointer represents. May convert the value to one of the canonical InfoSet types: String, Number, Boolean, Set.

      For example, in the case of an XML element, getValue() will return the text contained by the element rather than the element itself.

      Returns:
      Object value

    • setValue

      void setValue(Object value)
      Modifies the value of the object, property or collection element this pointer represents.
      Parameters:
      value - value to set