Java Doc for ExpressionList.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.ValueExpression
         org.josql.expressions.ExpressionList

ExpressionList
public class ExpressionList extends ValueExpression (Code)
This class represents a list of expressions used within a SQL statement.

Expressions lists are created using pairs of "[]" brackets, i.e.

 [toString, 10, true]
 
Would create a list of expressions that should be treated as a unit.

Since expression lists are also expressions it is possible to nest them to the nth degree, if desired. i.e.

 [toString, [1, 2, 3, 4], [true, true]]
 




Method Summary
public  voidaddExpression(Expression expr)
     Add an expression to the list.
public  Objectevaluate(Object o, Query q)
     Evaluates the value of this expression list.
public  ClassgetExpectedReturnType(Query q)
     Get the expected return type, which is List .
Parameters:
  q - The Query object.
public  ListgetExpressions()
     Returns the expressions, a list of Expression objects.
public  ObjectgetValue(Object o, Query q)
     Gets the value of the expressions, this will return a list of the values for each of the expressions in the list.
public  booleanhasFixedResult(Query q)
     Returns true if this expression list is empty (no expressions) or if ALL of the expressions have a fixed result.
Parameters:
  q - The Query object.
public  voidinit(Query q)
     Initialises this expression list, each expression in the list is inited.
public  booleanisTrue(Object o, Query q)
     Returns true if one of the expression values is non-null. Note: for efficiency this method calls Expression.getValue(ObjectQuery) on each expression directly and returns true for the first non-null value found, as such if any of your expressions triggers side-effects then this method should not be used.
Parameters:
  o - The current object.
public  voidsetExpressions(List exprs)
     Set the expressions.
public  StringtoString()
     Returns a string version of this expression list.



Method Detail
addExpression
public void addExpression(Expression expr)(Code)
Add an expression to the list.
Parameters:
  expr - The expression.



evaluate
public Object evaluate(Object o, Query q) throws QueryExecutionException(Code)
Evaluates the value of this expression list. This is just a thin-wrapper around: ExpressionList.getValue(Object,Query) .
Parameters:
  o - The current object.
Parameters:
  q - The Query object. The value of this expression list.
throws:
  QueryExecutionException - If there is a problem getting the values.



getExpectedReturnType
public Class getExpectedReturnType(Query q)(Code)
Get the expected return type, which is List .
Parameters:
  q - The Query object. List.



getExpressions
public List getExpressions()(Code)
Returns the expressions, a list of Expression objects. The expressions.



getValue
public Object getValue(Object o, Query q) throws QueryExecutionException(Code)
Gets the value of the expressions, this will return a list of the values for each of the expressions in the list. In essence Expression.getValue(ObjectQuery) is called on each of the expressions.
Parameters:
  o - The current object.
Parameters:
  q - The Query object. A list of the values, if there are no expressions in the list then an empty list is returned.
throws:
  QueryExecutionException - If something goes wrong the acquisition of the values.



hasFixedResult
public boolean hasFixedResult(Query q)(Code)
Returns true if this expression list is empty (no expressions) or if ALL of the expressions have a fixed result.
Parameters:
  q - The Query object. See description.



init
public void init(Query q) throws QueryParseException(Code)
Initialises this expression list, each expression in the list is inited.
Parameters:
  q - The Query object.
throws:
  QueryParseException - If one of the expressions cannot be inited.



isTrue
public boolean isTrue(Object o, Query q) throws QueryExecutionException(Code)
Returns true if one of the expression values is non-null. Note: for efficiency this method calls Expression.getValue(ObjectQuery) on each expression directly and returns true for the first non-null value found, as such if any of your expressions triggers side-effects then this method should not be used.
Parameters:
  o - The current object.
Parameters:
  q - The Query object. true if one of the expression values is non-null.
throws:
  QueryExecutionException - If a problem occurs during evaluation.



setExpressions
public void setExpressions(List exprs)(Code)
Set the expressions.
Parameters:
  exprs - The expressions.



toString
public String toString()(Code)
Returns a string version of this expression list. Returns in the form: "[" Expression [ , Expression ]* "]". A string version of the expression list.



Methods inherited from org.josql.expressions.ValueExpression
abstract public Object evaluate(Object o, Query q) throws QueryExecutionException(Code)(Java Doc)
public Object getValue(Object o, Query q) throws QueryExecutionException(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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