/*
 * Copyright (c) 2016 Red Hat, Inc. and others. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.yangtools.testutils.mockito;

import java.lang.reflect.Method;
import java.lang.reflect.Parameter;
import java.lang.reflect.Type;

/**
 * Nicer shorter toString() for {@link Method} than it's default.
 *
 * <p>Without modifiers, return type, FQN of class and exceptions; instead with parameter names (if javac -parameters).
 *
 * @author Michael Vorburger
 */
public final class MethodExtensions {

    private MethodExtensions() {
    }

    public static String toString(Method method) {
        StringBuilder sb = new StringBuilder();
        sb.append(method.getName());

        // copy/paste from java.lang.reflect.Executable.sharedToGenericString(int, boolean)
        sb.append('(');
        Type[] params = method.getGenericParameterTypes();
        Parameter[] parameters = method.getParameters(); // NEW
        for (int j = 0; j < params.length; j++) {
            String param = params[j].getTypeName();
            if (method.isVarArgs() && j == params.length - 1) { // replace T[] with T...
                param = param.replaceFirst("\\[\\]$", "...");
            }
            sb.append(param);
            // NEW
            if (parameters[j].isNamePresent()) {
                sb.append(' ');
                sb.append(parameters[j].getName());
            }
            // NEW END
            if (j < (params.length - 1)) {
                sb.append(", "); // NEW ", " instead of ','
            }
        }
        sb.append(')');

        return sb.toString();
    }

}