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https://issues.apache.org/jira/browse/GROOVY-11367?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17847558#comment-17847558
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Eric Milles commented on GROOVY-11367:
--------------------------------------
There is a subtle case where {{GroovyObject}} is not yet applied (see
GROOVY-10540) so "metaClass" field, getter, and setter are not available the
same as for a binary reference. Creating a virtual field in {{existsProperty}}
(see below) prevents the loop(s) from searching interfaces for {{getMetaClass}}
(see GROOVY-11381).
{code:java}
FieldNode field = current.getDeclaredField(propertyName);
if (field == null && propertyName.equals("metaClass") //
GROOVY-TODO
&& (current.getCompileUnit() != null &&
!current.isInterface())
&&
!Optional.ofNullable(current.getField("metaClass")).filter(f ->
!f.isPrivate()).isPresent()) {
field = new FieldNode("metaClass", Opcodes.ACC_PRIVATE |
Opcodes.ACC_SYNTHETIC | Opcodes.ACC_TRANSIENT, METACLASS_TYPE, current, null);
field.setDeclaringClass(current);
field.setSynthetic(true);
}
field = allowStaticAccessToMember(field, staticOnly);
{code}
> property semantics of map-based types
> -------------------------------------
>
> Key: GROOVY-11367
> URL: https://issues.apache.org/jira/browse/GROOVY-11367
> Project: Groovy
> Issue Type: Bug
> Reporter: Eric Milles
> Assignee: Eric Milles
> Priority: Major
> Labels: breaking
>
> The rules for property read and write for map-based types still have several
> inconsistencies:
> {code:groovy}
> class M extends HashMap<String,Object> {
> public pub
> protected pro
> @PackageScope pack
> private priv
> def prop
> def getAny() {}
> void setAny(value) {}
> }
> {code}
> # Read and write do not share a consistent resolution order – noted in 8555.
> Should access method selection take visibility into account? I think sender
> information is not always available to {{MetaClassImpl}} so the "inside
> class" behavior is required.
> {code:groovy}
> void test1(M map) {
> map.pub // field (fixed in 5001)
> map.pro // entry
> map.pack // entry
> map.priv // entry
> map.prop // property (fixed in 5001)
> map.any // getter (all visibilities -- fixed in 5001) or entry for
> subclass of M (private or package-private other-package subclass -- fixed in
> 11357)
> map.empty // entry ("class" and "metaClass" as well)
> map.pub = null // field
> map.pro = null // field
> map.pack = null // entry
> map.priv = null // entry
> map.prop = null // property
> map.any = null // setter (all visibilities) or entry for subclass of M
> (private or package-private other-package subclass -- fixed in 11357)
> map.empty = null // entry
> map.class = null // entry
> map.metaClass = null // setter via
> ScriptBytecodeAdapter#setGroovyObjectProperty
> }
> {code}
> # "this" and "super" have different behavior.
> {code:groovy}
> // add this to the body of M
> void test2(M that) {
> this.pub // field
> this.pro // field
> this.pack // field
> this.priv // field
> this.prop // property
> this.prop = null // property
> this.any // getter (all visibilities -- fixed in 5001)
> this.any = null // setter (all visibilities) or entry for subclass of M
> (private or package-private other-package subclass -- fixed in 11357)
> this.class // entry
> this.empty // entry
> this.metaClass // field (added by compiler)
> that.* // see test1
> that = this
> that.* // see test1
> }
> {code}
> # Dynamic and static compilation have different behavior.
> {code:groovy}
> @groovy.transform.CompileStatic
> void test3(M map) {
> map.pub // field (changed in 5001/5491)
> map.pro // field (changed in 5001/5491: in package or subclass) or entry
> map.pack // field (changed in 5001/5491: in package) or entry
> map.priv // entry
> map.prop // property (changed in 5001/5491)
> map.any // getter (accessible -- changed in 5001/5491) or entry
> (inaccessible)
> map.empty // isser (changed in 5001/5491)
> map.class // getter (changed in 5001/5491)
> map.metaClass // getter (changed in 5001/5491)
> map.pub = null // entry (changed in 6954)
> map.pro = null // entry (changed in 6954)
> map.pack = null // entry
> map.priv = null // entry
> map.prop = null // property
> map.any = null // setter (accessible) or error (inaccessible) -- TODO
> map.empty = null // error "Cannot set read-only property: empty" (and
> "class") -- GROOVY-11369
> map.metaClass = null // field or setter (need to determine which)
> }
> {code}
> # Closures intercept some properties.
> {code:groovy}
> void test4(M map) {
> map.with {
> pub // field
> pro // entry
> pack // entry
> priv // entry
> prop // property
> directive // closure property
> metaClass // closure property (and so on for "owner", "delegate",
> "thisObject", ...)
> }
> }
> {code}
> # The rules change a bit for fields declared by super class.
> {code:groovy}
> class MM extends M {
> void test5() {
> this.pub // field (fixed in 5001)
> this.pro // entry
> this.pack // entry
> this.priv // entry
> this.prop // property (fixed in 5001)
> this.any // getter (fixed in 5001) (public, protected, package-private
> if same-package) or entry (private, package-private if other-package)
> this.class // entry
> this.empty // entry
> this.metaClass // entry
> this.pub = null // field
> this.pro = null // field
> this.pack = null // entry
> this.priv = null // entry
> this.prop = null // property
> this.any = null // setter (public, protected, package-private if
> same-package) or entry (private, package-private if other-package -- fixed in
> 11357)
> this.empty = null // entry
> this.class = null // entry
> this.metaClass = null // setter via
> ScriptBytecodeAdapter#setGroovyObjectProperty
> }
> }
> {code}
> # Calling a name bypasses map lookup.
> {code:groovy}
> void test6(M map) {
> map.pack() // field read and call
> map.priv() // field read and call
> }
> {code}
> GROOVY-662, GROOVY-5001, GROOVY-5491, GROOVY-5517, GROOVY-5985, GROOVY-6144,
> GROOVY-6277, GROOVY-6954, GROOVY-8065, GROOVY-8074, GROOVY-8555, GROOVY-9127,
> GROOVY-11319, GROOVY-11223, GROOVY-11368, GROOVY-11369, GROOVY-11370,
> GROOVY-11376
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