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6304578: (reflect) toGenericString fails to print bounds of type variables on generic methods

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Reviewed-by: vromero, plevart, briangoetz, mcimadamore
This commit is contained in:
Joe Darcy 2018-11-01 20:37:45 -07:00
parent 72bfdd96f1
commit 7a350b9474
7 changed files with 88 additions and 49 deletions
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35
src/java.base/share/classes/java/lang/Class.java
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@ -59,6 +59,8 @@ import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.StringJoiner;
import java.util.stream.Stream;
import java.util.stream.Collectors;
import jdk.internal.HotSpotIntrinsicCandidate;
import jdk.internal.loader.BootLoader;
@ -200,7 +202,8 @@ public final class Class<T> implements java.io.Serializable,
* and {@code class}, {@code enum}, {@code interface}, or
* <code>&#64;</code>{@code interface}, as appropriate), followed
* by the type's name, followed by an angle-bracketed
* comma-separated list of the type's type parameters, if any.
* comma-separated list of the type's type parameters, if any,
* including informative bounds on the type parameters, if any.
*
* A space is used to separate modifiers from one another and to
* separate any modifiers from the kind of type. The modifiers
@ -262,11 +265,8 @@ public final class Class<T> implements java.io.Serializable,
TypeVariable<?>[] typeparms = component.getTypeParameters();
if (typeparms.length > 0) {
StringJoiner sj = new StringJoiner(",", "<", ">");
for(TypeVariable<?> typeparm: typeparms) {
sj.add(typeparm.getTypeName());
}
sb.append(sj.toString());
sb.append(Stream.of(typeparms).map(Class::typeVarBounds).
collect(Collectors.joining(",", "<", ">")));
}
for (int i = 0; i < arrayDepth; i++)
@ -276,6 +276,17 @@ public final class Class<T> implements java.io.Serializable,
}
}
static String typeVarBounds(TypeVariable<?> typeVar) {
Type[] bounds = typeVar.getBounds();
if (bounds.length == 1 && bounds[0].equals(Object.class)) {
return typeVar.getName();
} else {
return typeVar.getName() + " extends " +
Stream.of(bounds).map(Type::getTypeName).
collect(Collectors.joining(" & "));
}
}
/**
* Returns the {@code Class} object associated with the class or
* interface with the given string name. Invoking this method is
@ -3399,14 +3410,14 @@ public final class Class<T> implements java.io.Serializable,
* Helper method to get the method name from arguments.
*/
private String methodToString(String name, Class<?>[] argTypes) {
StringJoiner sj = new StringJoiner(", ", getName() + "." + name + "(", ")");
StringBuilder sb = new StringBuilder();
sb.append(getName() + "." + name + "(");
if (argTypes != null) {
for (int i = 0; i < argTypes.length; i++) {
Class<?> c = argTypes[i];
sj.add((c == null) ? "null" : c.getName());
}
Stream.of(argTypes).map(c -> {return (c == null) ? "null" : c.getName();}).
collect(Collectors.joining(","));
}
return sj.toString();
sb.append(")");
return sb.toString();
}
/** use serialVersionUID from JDK 1.1 for interoperability */