???????:
DefaultResolver

public interface Resolver
Property Name Expression Resolver.

Methods such as PropertyUtilsBean's setNestedProperty() method use a Resolver to process a property name expression and resolve nested, indexed and mapped property names. The following code provides an example usage demonstrating all the methods:

      // Iterate through a nested property expression
      while (resolver.hasNested(name)) {

          // isolate a single property from a nested expresion
          String next = resolver.next(name);

          // Process...
          String property = resolver.getProperty(next);
          if (resolver.isIndexed(next)) {

              int index = resolver.getIndex(next);
              bean = getIndexedProperty(bean, property, index);

          } else if (resolver.isMapped(next)) {

              String key = resolver.getKey(next);
              bean = getMappedProperty(bean, property, key);

          } else {

              bean = getSimpleProperty(bean, property);

          }

          // remove the processed property from the expression
          name = resolver.remove(name);
      }
 
In order to create an implementation, it is important to understand how BeanUtils/PropertyUtils uses the resolver. The following are the main methods that use it:
???????:
1.8.0
??:
$Id$
????:
  • ????

    ??????
    ??
    ??
    int
    getIndex(String expression)
    Extract the index value from the property expression or -1.
    getKey(String expression)
    Extract the map key from the property expression or null.
    getProperty(String expression)
    Return the property name from the property expression.
    boolean
    hasNested(String expression)
    Indicates whether or not the expression contains nested property expressions or not.
    boolean
    isIndexed(String expression)
    Indicate whether the expression is for an indexed property or not.
    boolean
    isMapped(String expression)
    Indicate whether the expression is for a mapped property or not.
    next(String expression)
    Extract the next property expression from the current expression.
    remove(String expression)
    Remove the last property expresson from the current expression.
  • ??????

    • getIndex

      int getIndex(String expression)
      Extract the index value from the property expression or -1.
      ??:
      expression - The property expression
      ??:
      The index value or -1 if the property is not indexed
      ??:
      IllegalArgumentException - If the indexed property is illegally formed or has an invalid (non-numeric) value
    • getKey

      String getKey(String expression)
      Extract the map key from the property expression or null.
      ??:
      expression - The property expression
      ??:
      The index value
      ??:
      IllegalArgumentException - If the mapped property is illegally formed
    • getProperty

      String getProperty(String expression)
      Return the property name from the property expression.
      ??:
      expression - The property expression
      ??:
      The property name
    • hasNested

      boolean hasNested(String expression)
      Indicates whether or not the expression contains nested property expressions or not.
      ??:
      expression - The property expression
      ??:
      The next property expression
    • isIndexed

      boolean isIndexed(String expression)
      Indicate whether the expression is for an indexed property or not.
      ??:
      expression - The property expression
      ??:
      true if the expresion is indexed, otherwise false
    • isMapped

      boolean isMapped(String expression)
      Indicate whether the expression is for a mapped property or not.
      ??:
      expression - The property expression
      ??:
      true if the expresion is mapped, otherwise false
    • next

      String next(String expression)
      Extract the next property expression from the current expression.
      ??:
      expression - The property expression
      ??:
      The next property expression
    • remove

      String remove(String expression)
      Remove the last property expresson from the current expression.
      ??:
      expression - The property expression
      ??:
      The new expression value, with first property expression removed - null if there are no more expressions