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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 .AndOrExpression

AndOrExpression
public class AndOrExpression extends BinaryExpression (Code)
	Represents either an `AND` expression or a `OR` expression. Lazy evaluation is employed here such if the expression is: `LHS OR RHS` and LHS = true then the RHS is NOT evaluated, if the expression is: `LHS AND RHS` and LHS = false then the RHS is NOT evaluated (see AndOrExpression.isTrue(Object,Query) ). This is important to note if you expect side-effects to occur in the RHS (bad practice anyway so don't do it!).

Method Summary

public boolean isAnd()

public boolean

isTrue(Object o, Query q)
Evaulates the expression and returns true if the expression evaulates to true.

Type LHS RHS Result Notes

AND true true true Both LHS and RHS are evaulated.

AND true false false Both LHS and RHS are evaulated.

AND false unknown or false false Only the LHS is evaulated.

OR true unknown true Only the LHS is evaulated.

OR false true true Both the LHS and RHS are evaulated.

OR false false false Both the LHS and RHS are evaulated.

public void setAnd(boolean v)

public String toString()
Return a string version of this expression. Note: any formatting of the statement (such as line breaks) will be removed. A string version of the expression.

Method Detail

isAnd
public boolean isAnd()(Code)

isTrue

public boolean isTrue(Object o, Query q) throws QueryExecutionException(Code)

Evaulates the expression and returns true if the expression evaulates to true.

In general what this means is that you should "left-weight" your expressions so that the expression that returns true most often (or more likely to return true) should be on the LHS.
Parameters:
  o - The current object to perform the expression on.
Parameters:
  q - The query object. true if the expression evaulates to true, falseotherwise.
throws:
  QueryExecutionException - If the expression cannot be evaulated.

setAnd
public void setAnd(boolean v)(Code)

toString
public String toString()(Code)
	Return a string version of this expression. Note: any formatting of the statement (such as line breaks) will be removed. A string version 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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