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Replacement for asSubclass()

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This commit is contained in:
Volker Berlin 2022-07-16 21:59:51 +02:00
parent 0ff60a2809
commit 56ac30b3b1
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1 changed files with 16 additions and 1 deletions
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17
src/de/inetsoftware/jwebassembly/module/nativecode/ReplacementForClass.java
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@ -229,7 +229,7 @@ class ReplacementForClass<T> {
* @return true, if type {@code cls} can be assigned to objects of this class * @return true, if type {@code cls} can be assigned to objects of this class
*/ */
@WasmTextCode( "unreachable" ) // TODO @WasmTextCode( "unreachable" ) // TODO
public native boolean isAssignableFrom( Class<?> cls ); public native boolean isAssignableFrom( ReplacementForClass<?> cls );
/** /**
* Replacement of the Java method isInterface() * Replacement of the Java method isInterface()
@ -501,4 +501,19 @@ class ReplacementForClass<T> {
throw new ClassCastException("Cannot cast " + obj.getClass().getName() + " to " + getName()); throw new ClassCastException("Cannot cast " + obj.getClass().getName() + " to " + getName());
return (T) obj; return (T) obj;
} }
/**
* Replacement of the Java method asSubclass(Class)
*
* @param clazz
* the class of the type to cast this class object to
* @return this
*/
@SuppressWarnings( "unchecked" )
public <U> ReplacementForClass<? extends U> asSubclass( ReplacementForClass<U> clazz ) {
if( clazz.isAssignableFrom( this ) )
return (ReplacementForClass<? extends U>)this;
else
throw new ClassCastException( this.toString() );
}
} }