package com.ryantenney.metrics.spring;

import java.lang.reflect.Method;
import java.util.Arrays;

public class MethodKey {
  private final String name;
  private final Class<?> returnType;
  private final Class<?>[] parameterTypes;

  public static MethodKey forMethod(Method method) {
    return new MethodKey(method);
  }
    
  private MethodKey(Method method){
    this.name = method.getName();
    this.returnType = method.getReturnType();
    this.parameterTypes = method.getParameterTypes();
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((name == null) ? 0 : name.hashCode());
    result = prime * result + Arrays.hashCode(parameterTypes);
    result = prime * result + ((returnType == null) ? 0 : returnType.hashCode());
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj)
      return true;
    if (obj == null)
      return false;
    if (getClass() != obj.getClass())
      return false;
    MethodKey other = (MethodKey) obj;
    if (name == null) {
      if (other.name != null)
        return false;
    } else if (!name.equals(other.name))
      return false;
    if (!Arrays.equals(parameterTypes, other.parameterTypes))
      return false;
    if (returnType == null) {
      if (other.returnType != null)
        return false;
    } else if (!returnType.equals(other.returnType))
      return false;
    return true;
  }
  
  

}

package com.ryantenney.metrics.spring;

import java.lang.reflect.Method;
import java.util.Arrays;

class MethodKey {
  private final String name;
  private final Class<?> returnType;
  private final Class<?>[] parameterTypes;

  public static MethodKey forMethod(Method method) {
    return new MethodKey(method);
  }
    
  private MethodKey(Method method){
    this.name = method.getName();
    this.returnType = method.getReturnType();
    this.parameterTypes = method.getParameterTypes();
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((name == null) ? 0 : name.hashCode());
    result = prime * result + Arrays.hashCode(parameterTypes);
    result = prime * result + ((returnType == null) ? 0 : returnType.hashCode());
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj)
      return true;
    if (obj == null)
      return false;
    if (getClass() != obj.getClass())
      return false;
    MethodKey other = (MethodKey) obj;
    if (name == null) {
      if (other.name != null)
        return false;
    } else if (!name.equals(other.name))
      return false;
    if (!Arrays.equals(parameterTypes, other.parameterTypes))
      return false;
    if (returnType == null) {
      if (other.returnType != null)
        return false;
    } else if (!returnType.equals(other.returnType))
      return false;
    return true;
  }
  
  

}

Make MethodKey package private