Class SimilarityChecker

src/main/java/matcher/SimilarityChecker.java:10–109

import matcher.type.MethodVarInstance;

public final class SimilarityChecker {
	public static float compare(ClassInstance a, ClassInstance b) {
		if (a.getMatch() != b) return 0;

		float ret = 0;

		for (MethodInstance m : a.getMethods()) {
			if (m.getMatch() != null) {
				ret += compare(m, m.getMatch());
			}
		}

		for (FieldInstance m : a.getFields()) {
			if (m.getMatch() != null) {
				ret += compare(m, m.getMatch());
			}
		}

		int div = a.getMethods().length + a.getFields().length;

		for (MethodInstance m : b.getMethods()) {
			if (m.getMatch() == null) {
				div++;
			}
		}

		for (FieldInstance m : b.getFields()) {
			if (m.getMatch() == null) {
				div++;
			}
		}

		return div > 0 ? ret / div : 1;
	}

	public static <T extends MemberInstance<T>> float compare(MemberInstance<T> a, MemberInstance<T> b) {
		if (a instanceof MethodInstance) {
			return compare((MethodInstance) a, (MethodInstance) b);
		} else {
			return compare((FieldInstance) a, (FieldInstance) b);
		}
	}

	public static float compare(MethodInstance a, MethodInstance b) {
		if (a.getMatch() != b) return 0;

		if (a.getAsmNode() == null || b.getAsmNode() == null) {
			return (a.getAsmNode() == null) == (b.getAsmNode() == null) ? 1 : 0;
		}

		float retTypeScore = ClassifierUtil.checkPotentialEquality(a.getRetType(), b.getRetType()) ? 1 : 0;
		float argTypeScore = 0;

		for (MethodVarInstance v : a.getArgs()) {
			if (v.getMatch() != null) {
				argTypeScore += compare(v, v.getMatch());
			}
		}