org.objectweb.medor.filter.lib
Class Substring

java.lang.Object
  |
  +--org.objectweb.medor.filter.lib.BasicThreeArgsOperator
        |
        +--org.objectweb.medor.filter.lib.Substring
All Implemented Interfaces:
java.lang.Cloneable, Cloneable, Expression, Operator, ThreeArgsOperator

public class Substring
extends BasicThreeArgsOperator
implements ThreeArgsOperator

Operator representing the substring extraction given a String, a first integer to start from and a second integer indicating the length of the required substring.


Field Summary
 
Fields inherited from class org.objectweb.medor.filter.lib.BasicThreeArgsOperator
first, firstResult, result, second, secondResult, third, thirdResult, type, verified
 
Fields inherited from interface org.objectweb.medor.filter.api.Operator
ABS, AND, AVG, BITWIZE, CONCAT, CONDAND, CONDOR, COUNT, DIV, EQUAL, FIRSTLOCATE, GREATER, GREATEREQUAL, IN, INDEXEDLOCATE, LENGTH, LOWER, LOWEREQUAL, MAX, MEMBEROF, MIN, MINUS, MOD, MULT, NAV, NOT, NOTEQUAL, NOTMEMBEROF, OR, PLUS, SQRT, SUBSTRING, SUM, UMINUS
 
Constructor Summary
Substring()
           
Substring(Expression inputString, Expression start, Expression length)
          Constructs the operator
 
Method Summary
 void compileExpression()
          Checks the semantic integrity of an expression.
 void evaluate(ParameterOperand[] pos, Tuple t)
          It evaluates the expression tree and puts the result into the operand result.
 java.lang.String evaluate(java.lang.String op, int start, int length)
           
 java.lang.String getOperatorString()
          Returns the String representing the operator in Java
 
Methods inherited from class org.objectweb.medor.filter.lib.BasicThreeArgsOperator
clone, getExpression, getFirstExpression, getOperandNumber, getResult, getSecondExpression, getThirdExpression, getType, isCompiled, setExpression, setFirstExpression, setSecondExpression, setThirdExpression
 
Methods inherited from class java.lang.Object
equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 
Methods inherited from interface org.objectweb.medor.filter.api.ThreeArgsOperator
getFirstExpression, getSecondExpression, getThirdExpression, setFirstExpression, setSecondExpression, setThirdExpression
 
Methods inherited from interface org.objectweb.medor.filter.api.Operator
getExpression, getOperandNumber, setExpression
 
Methods inherited from interface org.objectweb.medor.filter.api.Expression
getResult, getType, isCompiled
 
Methods inherited from interface org.objectweb.medor.api.Cloneable
clone
 

Constructor Detail

Substring

public Substring(Expression inputString,
                 Expression start,
                 Expression length)
Constructs the operator

Parameters:
inputString - is the String from which to extract the substing
start - is the index of the first character in the String to start with. It is expected that 1 is the first character in the string (and not 0 like in Java).
length - is the size of the requested substring

Substring

public Substring()
Method Detail

evaluate

public void evaluate(ParameterOperand[] pos,
                     Tuple t)
              throws MedorException,
                     java.lang.IllegalStateException
Description copied from interface: Expression
It evaluates the expression tree and puts the result into the operand result.

Specified by:
evaluate in interface Expression
Specified by:
evaluate in class BasicThreeArgsOperator
Parameters:
pos - a list of ParameterOperand
t - Tuple
Throws:
java.lang.IllegalStateException - if this expression is not compiled.
MedorException - if evaluation error

compileExpression

public void compileExpression()
                       throws TypingException,
                              MalformedExpressionException
Description copied from interface: Expression
Checks the semantic integrity of an expression. It checks that all types are compatible and prepare the expression to be evaluable.It also creates buffers where stores the result. Notes that when evaluating there is no creation of new objects. This method change the state of this expression object, it will be evaluable and not modifiable.

Specified by:
compileExpression in interface Expression
Throws:
MalformedExpressionException - if syntax error
TypingException - when incompatible types error occures.

evaluate

public java.lang.String evaluate(java.lang.String op,
                                 int start,
                                 int length)

getOperatorString

public java.lang.String getOperatorString()
Description copied from interface: Operator
Returns the String representing the operator in Java

Specified by:
getOperatorString in interface Operator
Returns:
the String representing the operator in Java