com.google.inject.internal.util.Classes Maven / Gradle / Ivy
package com.google.inject.internal.util;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* Class utilities.
*/
public final class Classes {
public static boolean isInnerClass(Class clazz) {
return !Modifier.isStatic(clazz.getModifiers())
&& clazz.getEnclosingClass() != null;
}
public static boolean isConcrete(Class clazz) {
int modifiers = clazz.getModifiers();
return !clazz.isInterface() && !Modifier.isAbstract(modifiers);
}
/**
* Formats a member as concise string, such as {@code java.util.ArrayList.size},
* {@code java.util.ArrayList()} or {@code java.util.List.remove()}.
*/
public static String toString(Member member) {
Class memberType = Classes.memberType(member);
if (memberType == Method.class) {
return member.getDeclaringClass().getName() + "." + member.getName() + "()";
} else if (memberType == Field.class) {
return member.getDeclaringClass().getName() + "." + member.getName();
} else if (memberType == Constructor.class) {
return member.getDeclaringClass().getName() + ".()";
} else {
throw new AssertionError();
}
}
/**
* Returns {@code Field.class}, {@code Method.class} or {@code Constructor.class}.
*/
public static Class memberType(Member member) {
checkNotNull(member, "member");
if (member instanceof Field) {
return Field.class;
} else if (member instanceof Method) {
return Method.class;
} else if (member instanceof Constructor) {
return Constructor.class;
} else {
throw new IllegalArgumentException(
"Unsupported implementation class for Member, " + member.getClass());
}
}
}