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

java.lang.Object
  com.bea.p13n.expression.internal.ComplexExpressionImpl
      com.bea.p13n.expression.operator.Operator
          com.bea.p13n.expression.operator.string.StringOperator
              com.bea.p13n.expression.operator.string.StringSubstring

All Implemented Interfaces

Expression, com.bea.p13n.expression.ExpressionEvents, Serializable, Cloneable

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 ).

See Also

Serialized Form

Field Summary

Fields inherited from class com.bea.p13n.expression.operator.string.StringOperator

BINARY_PARAMETER_SIGNATURE, UNARY_PARAMETER_SIGNATURE

Fields inherited from interface com.bea.p13n.expression.ExpressionEvents

EVENT_ADD_SUBEXPRESSION, EVENT_CLEAR_CACHE, EVENT_INTERNAL_MAX, EVENT_REMOVE_SUBEXPRESSION, EVENT_SET_CACHE_ENABLED, EVENT_SET_CACHED_VALUE, EVENT_SET_PARENT, EVENT_SET_SOURCE, EVENT_SET_SUBEXPRESSION, EVENT_SET_USER_DATA

Constructor Summary

StringSubstring()

StringSubstring(Object string, Object beginIndex, Object endIndex)

Method Summary

Class[]

getParameterSignature() Returns the parameter signature for this Expression.

Methods inherited from class com.bea.p13n.expression.operator.Operator

leftHandSide, operand, rightHandSide

Methods inherited from class 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 inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

StringSubstring

public StringSubstring()

StringSubstring

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

Method Detail

getParameterSignature

public Class[] getParameterSignature()

Description copied from interface: Expression

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.