ArraySuffix (jbpm-3.1.3) - JBoss JBPM 3.1.3 API 英文版文档

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org.jbpm.jpdl.el.impl
Class ArraySuffix

java.lang.Object
  org.jbpm.jpdl.el.impl.ValueSuffix
      org.jbpm.jpdl.el.impl.ArraySuffix

Direct Known Subclasses:: PropertySuffix

public class ArraySuffix
extends ValueSuffix
extends ValueSuffix

Represents an operator that obtains a Map entry, an indexed value, a property value, or an indexed property value of an object. The following are the rules for evaluating this operator:

  Evaluating a[b] (assuming a.b == a["b"])
    a is null
      return null
    b is null
      return null
    a is Map
      !a.containsKey (b)
        return null
      a.get(b) == null
        return null
      otherwise
        return a.get(b)
    a is List or array
      coerce b to int (using coercion rules)
      coercion couldn't be performed
        error
      a.get(b) or Array.get(a, b) throws ArrayIndexOutOfBoundsException or IndexOutOfBoundsException
        return null
      a.get(b) or Array.get(a, b) throws other exception
        error
      return a.get(b) or Array.get(a, b)
  
    coerce b to String
    b is a readable property of a
      getter throws an exception
        error
      otherwise
        return result of getter call
 
    otherwise
      error

Version:: $Change: 181177 $$DateTime: 2001/06/26 08:45:09 $$Author: tombaeyens $
Author:: Nathan Abramson - Art Technology Group, Shawn Bayern

Constructor Summary

ArraySuffix(Expression pIndex)
          Constructor

Method Summary

java.lang.Object evaluate(java.lang.Object pValue, VariableResolver pResolver, FunctionMapper functions, Logger pLogger)
          Evaluates the expression in the given context, operating on the given value.

java.lang.String getExpressionString()
          Returns the expression in the expression language syntax

Expression getIndex()


void setIndex(Expression pIndex)


Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Summary
`ArraySuffix(Expression pIndex)` Constructor

Method Summary
`java.lang.Object`	`evaluate(java.lang.Object pValue, VariableResolver pResolver, FunctionMapper functions, Logger pLogger)` Evaluates the expression in the given context, operating on the given value.
`java.lang.String`	`getExpressionString()` Returns the expression in the expression language syntax
`Expression`	`getIndex()`
`void`	`setIndex(Expression pIndex)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

ArraySuffix

public ArraySuffix(Expression pIndex)

Constructor

Method Detail

getIndex

public Expression getIndex()

setIndex

public void setIndex(Expression pIndex)

getExpressionString

public java.lang.String getExpressionString()

Returns the expression in the expression language syntax

Specified by:: getExpressionString in class ValueSuffix

evaluate

public java.lang.Object evaluate(java.lang.Object pValue,
                                 VariableResolver pResolver,
                                 FunctionMapper functions,
                                 Logger pLogger)
                          throws ELException

Evaluates the expression in the given context, operating on the given value.

Specified by:: evaluate in class ValueSuffix

Throws:: ELException