Resolver

Class Overview

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:

• PropertyUtilsBean
• getIndexedProperty(Object, String)
• getMappedProperty(Object, String)
• getNestedProperty(Object, String)
• getPropertyDescriptor(Object, String)
• getSimpleProperty(Object, String)
• setIndexedProperty(Object, String, Object)
• setMappedProperty(Object, String, Object)
• setNestedProperty(Object, String, Object)
• setSimpleProperty(Object, String, Object)
• BeanUtilsBean
• copyProperty(Object, String, Object)
• setProperty(Object, String, Object)
• LocaleBeanUtilsBean
• setProperty(Object, String, Object, String)

Summary

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