Java Doc for LikeExpression.java in  » Development » JoSQL » org » josql » expressions » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Development » JoSQL » org.josql.expressions 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.josql.expressions.Expression
      org.josql.expressions.BinaryExpression
         org.josql.expressions.LikeExpression

LikeExpression
public class LikeExpression extends BinaryExpression (Code)
Represents a LHS [ NOT ] [ $ ] LIKE RHS expression. It should be noted that unlike "normal" SQL the "." character is not supported since in practice it tends to be redundant.

It is possible to use: $ in front of the "LIKE" to indicate that a case insensitive comparison should be performed, for example:

 SELECT *
 FROM   java.lang.String
 WHERE  toString $LIKE '%value'
 

Also, the LHS or RHS can be built up using the "+" operator to concatenate a string, thus:

 SELECT *
 FROM   java.lang.String
 WHREE  toString $LIKE '%' + :myValue
 

In this way (using the BindVariable named bind variable ) you don't have to provide the wildcard.

It is also possible to specify your own "wildcard" character in the Query object using: Query.setWildcardCharacter(char) .

Note: the implementation is a modified version of that provided by: Kevin Stannard (http://www.jzoo.com/java/wildcardfilter/).





Method Summary
public  voidinit(Query q)
     Init the expression, we over-ride here so that if the RHS is fixed we can init the pattern that will be used to match the expression.
public  booleanisIgnoreCase()
    
public  booleanisNot()
    
public  booleanisTrue(Object o, Query q)
     Returns whether the LHS is "LIKE" the RHS. A special case here is that if the LHS and RHS are both null then true is returned.
public  voidsetIgnoreCase(boolean v)
    
public  voidsetNot(boolean v)
    
public  StringtoString()
     Returns a string version of the expression.



Method Detail
init
public void init(Query q) throws QueryParseException(Code)
Init the expression, we over-ride here so that if the RHS is fixed we can init the pattern that will be used to match the expression.
Parameters:
  q - The Query object.
throws:
  QueryParseException - If the LHS and/or RHS cannot be inited.



isIgnoreCase
public boolean isIgnoreCase()(Code)



isNot
public boolean isNot()(Code)



isTrue
public boolean isTrue(Object o, Query q) throws QueryExecutionException(Code)
Returns whether the LHS is "LIKE" the RHS. A special case here is that if the LHS and RHS are both null then true is returned. Also, if either the LHS or RHS is not null and one is null then false is returned.
Parameters:
  o - The object to evaluate the expression on.
Parameters:
  q - The Query object. true if the LHS is "LIKE" the RHS, false if not. And using"NOT" will invert the result.
throws:
  QueryExecutionException - If the expression cannot be evaluated.



setIgnoreCase
public void setIgnoreCase(boolean v)(Code)



setNot
public void setNot(boolean v)(Code)



toString
public String toString()(Code)
Returns a string version of the expression. Returns in the form:
Expression.toString Expression  [ NOT ] [ $ ]LIKE 
Expression.toString Expression 
A string representation of the expression.



Fields inherited from org.josql.expressions.BinaryExpression
protected Expression left(Code)(Java Doc)
protected Expression right(Code)(Java Doc)

Methods inherited from org.josql.expressions.BinaryExpression
public Class getExpectedReturnType(Query q)(Code)(Java Doc)
public Expression getLeft()(Code)(Java Doc)
public Expression getRight()(Code)(Java Doc)
public Object getValue(Object o, Query q) throws QueryExecutionException(Code)(Java Doc)
public boolean hasFixedResult(Query q)(Code)(Java Doc)
public void init(Query q) throws QueryParseException(Code)(Java Doc)
public void setLeft(Expression exp)(Code)(Java Doc)
public void setRight(Expression exp)(Code)(Java Doc)

Methods inherited from org.josql.expressions.Expression
abstract public Class getExpectedReturnType(Query q) throws QueryParseException(Code)(Java Doc)
abstract public Object getValue(Object o, Query q) throws QueryExecutionException(Code)(Java Doc)
abstract public boolean hasFixedResult(Query q)(Code)(Java Doc)
abstract public void init(Query q) throws QueryParseException(Code)(Java Doc)
public boolean isBracketed()(Code)(Java Doc)
abstract public boolean isTrue(Object o, Query q) throws QueryExecutionException(Code)(Java Doc)
public void setBracketed(boolean v)(Code)(Java Doc)
abstract public String toString()(Code)(Java Doc)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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