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[generator] Support 'managedOverride' metadata (#701)
Fixes: #681 There are scenarios where `generator` does not correctly find overridden methods, often due to generic parameters. When these issues happen, the fix is to `<remove-node/>` the offending method and add a fully hand-bound version of it as an `Addition`. This is a very manual fix to simply add `override` to a method. While we would like to eventually fix all these scenarios to "do the right thing", that will be a complex fix, and perhaps we will never be able to handle all cases. For now, we can at least alleviate the pain by adding a `metadata` attribute that allows the user to override our detection, avoiding the hand-binding. This new attribute is called `managedOverride` and allows the user to specify the values `virtual` or `override`, forcing us to use the requested modifier instead of `generator`'s usual logic. <attr path="//method[@name='example']" name="managedOverride">override</attr> <attr path="//method[@name='example']" name="managedOverride">virtual</attr>
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‎tests/generator-Tests/Unit-Tests/CodeGeneratorTests.cs‎

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@@ -99,6 +99,102 @@ public void WriteKotlinUnsignedArrayTypePropertiesClass ()
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Assert.AreEqual (GetTargetedExpected (nameof (WriteKotlinUnsignedArrayTypePropertiesClass)), writer.ToString ().NormalizeLineEndings ());
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}
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[Test]
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public void ManagedOverrideMethod_Virtual ()
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{
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var xml = @"<api>
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<package name='java.lang' jni-name='java/lang'>
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<class abstract='false' deprecated='not deprecated' final='false' name='Object' static='false' visibility='public' jni-signature='Ljava/lang/Object;' />
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</package>
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<package name='com.xamarin.android' jni-name='com/xamarin/android'>
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<class abstract='false' deprecated='not deprecated' extends='java.lang.Object' extends-generic-aware='java.lang.Object' jni-extends='Ljava/lang/Object;' final='false' name='MyClass' static='false' visibility='public' jni-signature='Lcom/xamarin/android/MyClass;'>
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<method abstract='false' deprecated='not deprecated' final='true' name='DoStuff' jni-signature='()I' bridge='false' native='false' return='int' jni-return='I' static='false' synchronized='false' synthetic='false' visibility='public' managedOverride='virtual'></method>
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</class>
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</package>
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</api>";
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var gens = ParseApiDefinition (xml);
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var klass = gens.Single (g => g.Name == "MyClass");
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generator.Context.ContextTypes.Push (klass);
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generator.WriteType (klass, string.Empty, new GenerationInfo ("", "", "MyAssembly"));
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generator.Context.ContextTypes.Pop ();
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Assert.True (writer.ToString ().Contains ("public virtual unsafe int DoStuff ()"));
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}
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[Test]
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public void ManagedOverrideMethod_Override ()
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{
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var xml = @"<api>
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<package name='java.lang' jni-name='java/lang'>
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<class abstract='false' deprecated='not deprecated' final='false' name='Object' static='false' visibility='public' jni-signature='Ljava/lang/Object;' />
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</package>
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<package name='com.xamarin.android' jni-name='com/xamarin/android'>
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<class abstract='false' deprecated='not deprecated' extends='java.lang.Object' extends-generic-aware='java.lang.Object' jni-extends='Ljava/lang/Object;' final='false' name='MyClass' static='false' visibility='public' jni-signature='Lcom/xamarin/android/MyClass;'>
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<method abstract='false' deprecated='not deprecated' final='true' name='DoStuff' jni-signature='()I' bridge='false' native='false' return='int' jni-return='I' static='false' synchronized='false' synthetic='false' visibility='public' managedOverride='override'></method>
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</class>
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</package>
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</api>";
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var gens = ParseApiDefinition (xml);
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var klass = gens.Single (g => g.Name == "MyClass");
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generator.Context.ContextTypes.Push (klass);
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generator.WriteType (klass, string.Empty, new GenerationInfo ("", "", "MyAssembly"));
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generator.Context.ContextTypes.Pop ();
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Assert.True (writer.ToString ().Contains ("public override unsafe int DoStuff ()"));
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}
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[Test]
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public void ManagedOverrideProperty_Virtual ()
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{
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var xml = @"<api>
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<package name='java.lang' jni-name='java/lang'>
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<class abstract='false' deprecated='not deprecated' final='false' name='Object' static='false' visibility='public' jni-signature='Ljava/lang/Object;' />
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</package>
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<package name='com.xamarin.android' jni-name='com/xamarin/android'>
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<class abstract='false' deprecated='not deprecated' extends='java.lang.Object' extends-generic-aware='java.lang.Object' jni-extends='Ljava/lang/Object;' final='false' name='MyClass' static='false' visibility='public' jni-signature='Lcom/xamarin/android/MyClass;'>
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<method abstract='false' deprecated='not deprecated' final='true' name='getName' jni-signature='()I' bridge='false' native='false' return='int' jni-return='I' static='false' synchronized='false' synthetic='false' visibility='public' managedOverride='virtual'></method>
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</class>
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</package>
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</api>";
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var gens = ParseApiDefinition (xml);
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var klass = gens.Single (g => g.Name == "MyClass");
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generator.Context.ContextTypes.Push (klass);
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generator.WriteType (klass, string.Empty, new GenerationInfo ("", "", "MyAssembly"));
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generator.Context.ContextTypes.Pop ();
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Assert.True (writer.ToString ().Contains ("public virtual unsafe int Name {"));
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}
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[Test]
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public void ManagedOverrideProperty_Override ()
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{
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var xml = @"<api>
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<package name='java.lang' jni-name='java/lang'>
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<class abstract='false' deprecated='not deprecated' final='false' name='Object' static='false' visibility='public' jni-signature='Ljava/lang/Object;' />
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</package>
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<package name='com.xamarin.android' jni-name='com/xamarin/android'>
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<class abstract='false' deprecated='not deprecated' extends='java.lang.Object' extends-generic-aware='java.lang.Object' jni-extends='Ljava/lang/Object;' final='false' name='MyClass' static='false' visibility='public' jni-signature='Lcom/xamarin/android/MyClass;'>
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<method abstract='false' deprecated='not deprecated' final='true' name='getName' jni-signature='()I' bridge='false' native='false' return='int' jni-return='I' static='false' synchronized='false' synthetic='false' visibility='public' managedOverride='override'></method>
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</class>
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</package>
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</api>";
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var gens = ParseApiDefinition (xml);
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var klass = gens.Single (g => g.Name == "MyClass");
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generator.Context.ContextTypes.Push (klass);
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generator.WriteType (klass, string.Empty, new GenerationInfo ("", "", "MyAssembly"));
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generator.Context.ContextTypes.Pop ();
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Assert.True (writer.ToString ().Contains ("public override unsafe int Name {"));
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}
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}
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[TestFixture]

‎tools/generator/Java.Interop.Tools.Generator.Importers/XmlApiImporter.cs‎

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@@ -256,6 +256,7 @@ public static Method CreateMethod (GenBase declaringType, XElement elem)
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IsReturnEnumified = elem.Attribute ("enumReturn") != null,
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IsStatic = elem.XGetAttribute ("static") == "true",
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JavaName = elem.XGetAttribute ("name"),
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ManagedOverride = elem.XGetAttribute ("managedOverride"),
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ManagedReturn = elem.XGetAttribute ("managedReturn"),
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PropertyNameOverride = elem.XGetAttribute ("propertyName"),
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Return = elem.XGetAttribute ("return"),

‎tools/generator/Java.Interop.Tools.Generator.ObjectModel/Method.cs‎

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@@ -26,6 +26,7 @@ public Method (GenBase declaringType) : base (declaringType)
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public bool IsStatic { get; set; }
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public bool IsVirtual { get; set; }
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public string JavaName { get; set; }
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public string ManagedOverride { get; set; }
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public string ManagedReturn { get; set; }
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public string PropertyNameOverride { get; set; }
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public string Return { get; set; }

‎tools/generator/SourceWriters/BoundMethod.cs‎

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@@ -44,6 +44,15 @@ public BoundMethod (GenBase type, Method method, CodeGenerationOptions opt, bool
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if ((IsVirtual || !IsOverride) && type.RequiresNew (method.AdjustedName, method))
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IsShadow = true;
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// Allow user to override our virtual/override logic
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if (method.ManagedOverride?.ToLowerInvariant () == "virtual") {
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IsVirtual = true;
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IsOverride = false;
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} else if (method.ManagedOverride?.ToLowerInvariant () == "override") {
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IsVirtual = false;
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IsOverride = true;
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}
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ReturnType = new TypeReferenceWriter (opt.GetTypeReferenceName (method.RetVal));
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if (method.DeclaringType.IsGeneratable)

‎tools/generator/SourceWriters/BoundProperty.cs‎

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@@ -55,6 +55,15 @@ public BoundProperty (GenBase gen, Property property, CodeGenerationOptions opt,
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}
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}
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// Allow user to override our virtual/override logic
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if (!forceOverride && (property.Getter ?? property.Setter).ManagedOverride?.ToLowerInvariant () == "virtual") {
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IsVirtual = true;
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IsOverride = false;
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} else if (!forceOverride && (property.Getter ?? property.Setter).ManagedOverride?.ToLowerInvariant () == "override") {
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IsVirtual = false;
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IsOverride = true;
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}
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// Unlike [Register], [Obsolete] cannot be put on property accessors, so we can apply them only under limited condition...
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if (property.Getter.Deprecated != null && (property.Setter == null || property.Setter.Deprecated != null))
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Attributes.Add (new ObsoleteAttr (property.Getter.Deprecated.Replace ("\"", "\"\"").Trim () + (property.Setter != null && property.Setter.Deprecated != property.Getter.Deprecated ? " " + property.Setter.Deprecated.Replace ("\"", "\"\"").Trim () : null)));

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