Package jadex.rules.parser.conditions.javagrammar

Class ConstraintBuilder

java.lang.Object

jadex.rules.parser.conditions.javagrammar.ConstraintBuilder

public class ConstraintBuilder
extends java.lang.Object

The constraint builder takes an expression (e.g. from the parser) and generates appropriate constraints and/or conditions for it.

Constructor Summary

Constructors

Constructor	Description
ConstraintBuilder()

Method Summary

Modifier and Type	Method	Description
protected static void	buildConstraint(Expression exp, BuildContext context, boolean invert, IParserHelper helper)	Build a constraint for a single expression.
static ICondition	buildConstraints(Expression expression, BuildContext context, IParserHelper helper)	Build or adapt conditions for representing the given constraints.
protected static void	buildOperatorConstraint(Expression left, Expression right, IOperator op, BuildContext context, IParserHelper helper)	Build an operator constraint.
protected static java.util.List	combineValueSources(java.lang.Object valuesource, java.util.List suffs)	Combine (i.e.
protected static MethodCall	createMethodCall(OAVJavaType type, java.lang.String name, Expression[] paramvalues, BuildContext context, IParserHelper helper)	Create a method call.
protected static Expression	flattenToPrimary(Expression value, BuildContext context, IParserHelper helper)	Flatten a value to a primary value (literal or variable).
protected static java.lang.Object	getObjectConditionAndValueSource(Expression value, BuildContext context, IParserHelper helper)	Find or create an object condition for a value and return the appropriate value source.
protected static void	shuffle(BuildContext context)	Shuffle conditions and constraints, such that all variables are bound before used.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ConstraintBuilder

public ConstraintBuilder()

Method Detail

buildConstraints

public static ICondition buildConstraints(Expression expression,
                                          BuildContext context,
                                          IParserHelper helper)

Build or adapt conditions for representing the given constraints.

Parameters:

expression - The expression, which contains the constraints to represent.

context - The build context.

Returns:

The generated condition.

buildConstraint

protected static void buildConstraint(Expression exp,
                                      BuildContext context,
                                      boolean invert,
                                      IParserHelper helper)

Build a constraint for a single expression.

buildOperatorConstraint

protected static void buildOperatorConstraint(Expression left,
                                              Expression right,
                                              IOperator op,
                                              BuildContext context,
                                              IParserHelper helper)

Build an operator constraint.

getObjectConditionAndValueSource

protected static java.lang.Object getObjectConditionAndValueSource(Expression value,
                                                                   BuildContext context,
                                                                   IParserHelper helper)

Find or create an object condition for a value and return the appropriate value source. The condition is pushed on the stack of the build context. When the condition is no longer required (e.g. all current constraints added) it has to be popped from the stack (manually).

Parameters:

value - The value to be obtained.

lcons - The existing conditions.

bcons - The conditions for existing variables.

tmodel - The type model.

Returns:

The value source.

createMethodCall

protected static MethodCall createMethodCall(OAVJavaType type,
                                             java.lang.String name,
                                             Expression[] paramvalues,
                                             BuildContext context,
                                             IParserHelper helper)

Create a method call.

Parameters:

type - The object type.

name - The method name.

paramvalues - The parameter values.

context - The build context.

Returns:

The method call object.

flattenToPrimary

protected static Expression flattenToPrimary(Expression value,
                                             BuildContext context,
                                             IParserHelper helper)

Flatten a value to a primary value (literal or variable). For a complex expression, additional conditions might be created that bind the desired value in a new variable.

Parameters:

value - The value to be obtained.

lcons - The existing conditions.

bcons - The conditions for existing variables.

tmodel - The type model.

Returns:

The primary value (i.e. variable or literal).

shuffle

protected static void shuffle(BuildContext context)

Shuffle conditions and constraints, such that all variables are bound before used.

Parameters:

lcons - The list of conditions (shuffled in place).

combineValueSources

protected static java.util.List combineValueSources(java.lang.Object valuesource,
                                                    java.util.List suffs)

Combine (i.e. chain) value sources.

Parameters:

valuesource - The initial value source.

suffs - The suffixes to the initial value source.

Returns:

The combined value source.