StringSubstring Class

com.bea.p13n.expression.operator.string
StringSubstring Class

public final class StringSubstring

    extends StringOperator

Implementation of the StringSubstring operator.
Input 1: A String (or Expression returning a String) that is LHS of the operator.
Input 2: A Number (or Expression returning a Number) that is RHS of the operator.
Input 3: A Number (or Expression returning a Number) that is RRHS of the operator.
Returns: A String: LHS.substring( RHS, RRHS ).


Hierarchy
Object
  ComplexExpressionImpl
    Operator
      StringOperator
        StringSubstring
All Implemented Interfaces

Cloneable, Expression, Serializable

Field Summary

   
Fields from  com.bea.p13n.expression.operator.string.StringOperator
BINARY_PARAMETER_SIGNATURE, UNARY_PARAMETER_SIGNATURE
 

Constructor Summary

StringSubstring()

StringSubstring(Object string, Object beginIndex, Object endIndex)

 

Method Summary

public Class[]
getParameterSignature()
Returns the parameter signature for this Expression.
 
Methods from  com.bea.p13n.expression.operator.Operator
leftHandSide, operand, rightHandSide
 
Methods from  com.bea.p13n.expression.internal.ComplexExpressionImpl
addListener, addSubExpression, clearCache, clone, createProxyExpression, equals, getCachedValue, getParent, getSource, getSubExpression, getSubExpressionCount, getUserData, hashCode, isCached, isCacheEnabled, isEqualitySubExpression, notifyListeners, removeAllSubExpressions, removeListener, removeSubExpression, removeSubExpression, setCachedValue, setCacheEnabled, setParent, setSource, setSubExpression, setUserData, toString, write
 
Methods from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
   
Methods from interface com.bea.p13n.expression.Expression
accept, addListener, addSubExpression, clearCache, clone, getCachedValue, getParameterSignature, getParent, getSource, getSubExpression, getSubExpressionCount, getUserData, isCached, isCacheEnabled, removeAllSubExpressions, removeListener, removeSubExpression, removeSubExpression, setCachedValue, setCacheEnabled, setSource, setSubExpression, setUserData, write
 

Constructor Detail

StringSubstring

public StringSubstring()

StringSubstring

public StringSubstring(Object string, 
                       Object beginIndex, 
                       Object endIndex)
 

Method Detail

getParameterSignature() Method

public Class[] getParameterSignature()
Description copied from Expression.getParameterSignature()
Returns the parameter signature for this Expression. Because the sub-expressions within the Expression are typically arguments or operands, some type validation is performed by examining the class types of the sub-expressions against the Expression's parameter signature.
The tests that are performed are:
1. The number of sub-expressions must equals the number of parameter entries.
2. The class type of any sub-expression (or the result of evaluating the sub-expresssion) must equal the class type of the corresponding parameter entry.
3. Any null parameter entries are ignored and are considered optional sub-expressions.

Returns

the Class array containing the parameter signature.