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

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`

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.

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Copyright © 2004 BEA Systems, Inc. All Rights Reserved