groovy.beans
[Java] Class VetoableASTTransformation

java.lang.Object
  groovy.beans.BindableASTTransformation
      groovy.beans.VetoableASTTransformation

@GroovyASTTransformation(phase = CompilePhase.CANONICALIZATION)
public class VetoableASTTransformation
extends BindableASTTransformation

Handles generation of code for the @Vetoable annotation, and @Bindable if also present.

Generally, it adds (if needed) a VetoableChangeSupport field and the needed add/removeVetoableChangeListener methods to support the listeners.

It also generates the setter and wires the setter through the VetoableChangeSupport.

If a Bindable annotation is detected it also adds support similar to what BindableASTTransformation would do.

Authors:

Danno Ferrin (shemnon)

Chris Reeves

constrainedClassNode

protected static ClassNode constrainedClassNode

vcsClassNode

protected ClassNode vcsClassNode

addVetoableChangeSupport

protected void addVetoableChangeSupport(ClassNode declaringClass)

Adds the necessary field and methods to support vetoable change support.

Adds a new field: "protected final java.beans.VetoableChangeSupport this$vetoableChangeSupport = new java.beans.VetoableChangeSupport(this)"

Also adds support methods: public void addVetoableChangeListener(java.beans.VetoableChangeListener) public void addVetoableChangeListener(String, java.beans.VetoableChangeListener) public void removeVetoableChangeListener(java.beans.VetoableChangeListener) public void removeVetoableChangeListener(String, java.beans.VetoableChangeListener) public java.beans.VetoableChangeListener[] getVetoableChangeListeners()

Parameters:

declaringClass - the class to which we add the support field and methods

createConstrainedStatement

protected Statement createConstrainedStatement(PropertyNode propertyNode, Expression fieldExpression)

Creates a statement body similar to: this.fireVetoableChange("field", field, field = value)

Parameters:

propertyNode - the field node for the property

fieldExpression - a field expression for setting the property value

Returns:

the created statement

createSetStatement

protected Statement createSetStatement(Expression fieldExpression)

Creates a statement body similar to: field = value.

Used when the field is not also

Bindable:

@param fieldExpression a field expression for setting the property value

Returns:

the created statement

createSetterMethod

protected void createSetterMethod(ClassNode declaringClass, PropertyNode propertyNode, String setterName, Statement setterBlock)

Creates a setter method with the given body.

This differs from normal setters in that we need to add a declared exception java.beans.PropertyVetoException

Parameters:

declaringClass - the class to which we will add the setter

propertyNode - the field to back the setter

setterName - the name of the setter

setterBlock - the statement representing the setter block

hasVetoableAnnotation

public static boolean hasVetoableAnnotation(AnnotatedNode node)

Convenience method to see if an annotated node is @Vetoable.

Parameters:

node - the node to check

Returns:

true if the node is constrained

needsVetoableChangeSupport

protected boolean needsVetoableChangeSupport(ClassNode declaringClass, SourceUnit sourceUnit)

Snoops through the declaring class and all parents looking for a field of type VetoableChangeSupport. Remembers the field and returns false if found otherwise returns true to indicate that such support should be added.

Parameters:

declaringClass - the class to search

Returns:

true if vetoable change support should be added

visit

public void visit(ASTNode[] nodes, SourceUnit source)

Handles the bulk of the processing, mostly delegating to other methods.

Parameters:

nodes - the AST nodes

source - the source unit for the nodes

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