net.fushizen.invokedynamic.proxy.ConcreteMethodTracker Maven / Gradle / Ivy

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A Java runtime proxy class generator using invokedynamic for better performance and more capabilities than the standard Java proxies.

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package net.fushizen.invokedynamic.proxy;

import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.HashSet;

class ConcreteMethodTracker {
    private HashSet contributors = new HashSet<>();

    public void add(Method m) {
        if ((m.getModifiers() & Modifier.ABSTRACT) != 0) return;

        // Remove any concrete implementations that come from superclasses of the class that owns this new method
        // (this new class shadows them).
        contributors.removeIf(m2 -> m2.getDeclaringClass().isAssignableFrom(m.getDeclaringClass()));

        contributors.add(m);
    }

    public Method getOnlyContributor() {
        if (contributors.size() != 1) return null;

        return contributors.iterator().next();
    }
}