org.codehaus.groovy.transform.trait

## Class TraitASTTransformation

- java.lang.Object
- - org.codehaus.groovy.transform.AbstractASTTransformation
  - - org.codehaus.groovy.transform.trait.TraitASTTransformation

- All Implemented Interfaces:
    CompilationUnitAware, ASTTransformation, ErrorCollecting, org.objectweb.asm.Opcodes

      public class TraitASTTransformation
      extends AbstractASTTransformation
      implements CompilationUnitAware

  Handles generation of code for the traits (trait keyword is equivalent to using the @Trait annotation). A class annotated with @Trait will generate, instead:
  - an interface with the same name
  - a utility inner class that will be used by the compiler to implement the trait
  - potentially a utility inner class to assist with implementing trait fields

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `DO_DYNAMIC`
    `static String` | `POST_TYPECHECKING_REPLACEMENT`

    - ### Fields inherited from class org.codehaus.groovy.transform.AbstractASTTransformation

      `RETENTION_CLASSNODE, sourceUnit`

    - ### Fields inherited from interface org.objectweb.asm.Opcodes

      `AALOAD, AASTORE, ACC_ABSTRACT, ACC_ANNOTATION, ACC_BRIDGE, ACC_DEPRECATED, ACC_ENUM, ACC_FINAL, ACC_INTERFACE, ACC_MANDATED, ACC_MODULE, ACC_NATIVE, ACC_OPEN, ACC_PRIVATE, ACC_PROTECTED, ACC_PUBLIC, ACC_STATIC, ACC_STATIC_PHASE, ACC_STRICT, ACC_SUPER, ACC_SYNCHRONIZED, ACC_SYNTHETIC, ACC_TRANSIENT, ACC_TRANSITIVE, ACC_VARARGS, ACC_VOLATILE, ACONST_NULL, ALOAD, ANEWARRAY, ARETURN, ARRAYLENGTH, ASM4, ASM5, ASM6, ASM7, ASM8_EXPERIMENTAL, ASTORE, ATHROW, BALOAD, BASTORE, BIPUSH, CALOAD, CASTORE, CHECKCAST, D2F, D2I, D2L, DADD, DALOAD, DASTORE, DCMPG, DCMPL, DCONST_0, DCONST_1, DDIV, DLOAD, DMUL, DNEG, DOUBLE, DREM, DRETURN, DSTORE, DSUB, DUP, DUP_X1, DUP_X2, DUP2, DUP2_X1, DUP2_X2, F_APPEND, F_CHOP, F_FULL, F_NEW, F_SAME, F_SAME1, F2D, F2I, F2L, FADD, FALOAD, FASTORE, FCMPG, FCMPL, FCONST_0, FCONST_1, FCONST_2, FDIV, FLOAD, FLOAT, FMUL, FNEG, FREM, FRETURN, FSTORE, FSUB, GETFIELD, GETSTATIC, GOTO, H_GETFIELD, H_GETSTATIC, H_INVOKEINTERFACE, H_INVOKESPECIAL, H_INVOKESTATIC, H_INVOKEVIRTUAL, H_NEWINVOKESPECIAL, H_PUTFIELD, H_PUTSTATIC, I2B, I2C, I2D, I2F, I2L, I2S, IADD, IALOAD, IAND, IASTORE, ICONST_0, ICONST_1, ICONST_2, ICONST_3, ICONST_4, ICONST_5, ICONST_M1, IDIV, IF_ACMPEQ, IF_ACMPNE, IF_ICMPEQ, IF_ICMPGE, IF_ICMPGT, IF_ICMPLE, IF_ICMPLT, IF_ICMPNE, IFEQ, IFGE, IFGT, IFLE, IFLT, IFNE, IFNONNULL, IFNULL, IINC, ILOAD, IMUL, INEG, INSTANCEOF, INTEGER, INVOKEDYNAMIC, INVOKEINTERFACE, INVOKESPECIAL, INVOKESTATIC, INVOKEVIRTUAL, IOR, IREM, IRETURN, ISHL, ISHR, ISTORE, ISUB, IUSHR, IXOR, JSR, L2D, L2F, L2I, LADD, LALOAD, LAND, LASTORE, LCMP, LCONST_0, LCONST_1, LDC, LDIV, LLOAD, LMUL, LNEG, LONG, LOOKUPSWITCH, LOR, LREM, LRETURN, LSHL, LSHR, LSTORE, LSUB, LUSHR, LXOR, MONITORENTER, MONITOREXIT, MULTIANEWARRAY, NEW, NEWARRAY, NOP, NULL, POP, POP2, PUTFIELD, PUTSTATIC, RET, RETURN, SALOAD, SASTORE, SIPUSH, SOURCE_DEPRECATED, SOURCE_MASK, SWAP, T_BOOLEAN, T_BYTE, T_CHAR, T_DOUBLE, T_FLOAT, T_INT, T_LONG, T_SHORT, TABLESWITCH, TOP, UNINITIALIZED_THIS, V_PREVIEW, V1_1, V1_2, V1_3, V1_4, V1_5, V1_6, V1_7, V1_8, V10, V11, V12, V13, V14, V15, V9`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `TraitASTTransformation()`

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `setCompilationUnit(CompilationUnit unit)`
    `void` | `visit(ASTNode[] nodes, SourceUnit source)` The method is invoked when an AST Transformation is active.

    - ### Methods inherited from class org.codehaus.groovy.transform.AbstractASTTransformation

      `addError, checkIncludeExclude, checkIncludeExclude, checkIncludeExcludeUndefinedAware, checkIncludeExcludeUndefinedAware, checkNotInterface, checkPropertyList, checkPropertyList, checkPropertyList, copyAnnotatedNodeAnnotations, copyAnnotatedNodeAnnotations, deemedInternalName, getAnnotationName, getClassList, getMemberClassList, getMemberClassValue, getMemberClassValue, getMemberIntValue, getMemberList, getMemberStringList, getMemberStringValue, getMemberStringValue, getMemberValue, hasAnnotation, init, memberHasValue, nonGeneric, shouldSkip, shouldSkip, shouldSkipOnDescriptor, shouldSkipOnDescriptorUndefinedAware, shouldSkipUndefinedAware, shouldSkipUndefinedAware, tokenize`

    - ### Methods inherited from class java.lang.Object

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

- - ### Field Detail

    - #### DO_DYNAMIC

          public static final String DO_DYNAMIC

    - #### POST_TYPECHECKING_REPLACEMENT

          public static final String POST_TYPECHECKING_REPLACEMENT

  - ### Constructor Detail

    - #### TraitASTTransformation

          public TraitASTTransformation()

  - ### Method Detail

    - #### visit

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

      Description copied from interface: `ASTTransformation`
      The method is invoked when an AST Transformation is active. For local transformations, it is invoked once each time the local annotation is encountered. For global transformations, it is invoked once for every source unit, which is typically a source file.
      Specified by:
        `visit` in interface `ASTTransformation`
      Parameters:
        `nodes` - The ASTnodes when the call was triggered. Element 0 is the AnnotationNode that triggered this annotation to be activated. Element 1 is the AnnotatedNode decorated, such as a MethodNode or ClassNode. For global transformations it is usually safe to ignore this parameter.
        `source` - The source unit being compiled. The source unit may contain several classes. For global transformations, information about the AST can be retrieved from this object.

    - #### setCompilationUnit

          public void setCompilationUnit(CompilationUnit unit)

      Specified by:
        `setCompilationUnit` in interface `CompilationUnitAware`