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## 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 annotaton is detected it also adds support similar to what BindableASTTransformation would do.

Authors:
  Danno Ferrin (shemnon)
  Chris Reeves

Field Summary
`protected static ClassNode` | `constrainedClassNode`
`protected ClassNode` | `vcsClassNode`

Fields inherited from class BindableASTTransformation
boundClassNode, pcsClassNode

Method Summary
`protected void` | `addVetoableChangeSupport(ClassNode declaringClass)` Adds the necessary field and methods to support vetoable change support.
`protected Statement` | `createConstrainedStatement(PropertyNode propertyNode, Expression fieldExpression)` Creates a statement body silimar to: `this.fireVetoableChange("field", field, field = value)`
`protected Statement` | `createSetStatement(Expression fieldExpression)` Creates a statement body similar to: `field = value` Used when the field is not also @Bindable
`protected void` | `createSetterMethod(ClassNode declaringClass, PropertyNode propertyNode, String setterName, Statement setterBlock)` Creates a setter method with the given body.
`static boolean` | `hasVetoableAnnotation(AnnotatedNode node)` Convenience method to see if an annotated node is `@Vetoable`.
`protected boolean` | `needsVetoableChangeSupport(ClassNode declaringClass, SourceUnit sourceUnit)` Snoops through the declaring class and all parents looking for a field of type VetoableChangeSupport.
`void` | `visit(ASTNode[] nodes, SourceUnit source)` Handles the bulk of the processing, mostly delegating to other methods.

Methods inherited from class BindableASTTransformation
addPropertyChangeSupport, createBindableStatement, createSetterMethod, hasBindableAnnotation, needsPropertyChangeSupport, visit

Methods inherited from class Object
wait, wait, wait, equals, toString, hashCode, getClass, notify, notifyAll

Field Detail

### constrainedClassNode

    protected static ClassNode constrainedClassNode

### vcsClassNode

    protected ClassNode vcsClassNode

Method Detail

### 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 silimar 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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