Java Doc for BinaryExpression.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 All known Subclasses:   org.josql.expressions.IsNullExpression,  org.josql.expressions.EqualsExpression,  org.josql.expressions.GTLTExpression,  org.josql.expressions.BetweenExpression,  org.josql.expressions.InExpression,  org.josql.expressions.AndOrExpression,  org.josql.expressions.LikeExpression, BinaryExpression abstract public class BinaryExpression extends Expression (Code) Super-class of Expressions that return a binary result. A binary expression must always have a LHS. The RHS is optional. Field Summary protected  Expression left      protected  Expression right      Method Summary public  Class getExpectedReturnType(Query q)      Return the expected return type from this expression. Parameters:   q - The Query object. public  Expression getLeft()      Get the LHS. public  Expression getRight()      Get the RHS. public  Object getValue(Object o, Query q)      Get the value of this expression. public  boolean hasFixedResult(Query q)      Return whether this expression, and more specifically the left and right parts of the expression return a fixed result. Sub-classes may override this method for more tailored results, especially if the binary expression does not demand a RHS. Parameters:   q - The Query object. public  void init(Query q)      Init the expression. public  void setLeft(Expression exp)      public  void setRight(Expression exp)      Field Detail left protected Expression left(Code) right protected Expression right(Code) Method Detail getExpectedReturnType public Class getExpectedReturnType(Query q)(Code) Return the expected return type from this expression. Parameters:   q - The Query object. The class of the return type, this method ALWAYS returns Boolean.class. getLeft public Expression getLeft()(Code) Get the LHS. The LHS of the expression. getRight public Expression getRight()(Code) Get the RHS. The RHS of the expression. getValue public Object getValue(Object o, Query q) throws QueryExecutionException(Code) Get the value of this expression. This will always return an instance of: java.lang.Boolean created as the result of a call to: Expression.getValue(ObjectQuery) . Parameters:   o - The object to evaluate the expression on. Parameters:   q - The Query object. An instance of Boolean. throws:   QueryExecutionException - If the expression cannot be evaluated. hasFixedResult public boolean hasFixedResult(Query q)(Code) Return whether this expression, and more specifically the left and right parts of the expression return a fixed result. Sub-classes may override this method for more tailored results, especially if the binary expression does not demand a RHS. Parameters:   q - The Query object. true if the expression has a fixed result. init public void init(Query q) throws QueryParseException(Code) Init the expression. Sub-classes will often override this method. This method just calls: Expression.init(Query) on the LHS and RHS (if present) of the expression. Parameters:   q - The Query object. throws:   QueryParseException - If the LHS and/or RHS cannot be inited. setLeft public void setLeft(Expression exp)(Code) setRight public void setRight(Expression exp)(Code) 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)