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Spring integration for Coda Hale's Metrics Library

There is a newer version: 3.1.3

/**
 * Copyright (C) 2012 Ryan W Tenney ([email protected])
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
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;
	private final int hashCode;

	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();
		this.hashCode = computeHashCode();
	}

	@Override
	public int hashCode() {
		return hashCode;
	}

	private int computeHashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + name.hashCode();
		result = prime * result + Arrays.hashCode(parameterTypes);
		result = prime * result + 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;
		}
		final MethodKey other = (MethodKey) obj;
		return name.equals(other.name) && returnType.equals(other.returnType) && Arrays.equals(parameterTypes, other.parameterTypes);
	}

	@Override
	public String toString() {
		final StringBuilder sb = new StringBuilder();
		sb.append(returnType.getSimpleName());
		sb.append(' ');
		sb.append(name);
		sb.append('(');
		boolean firstParam = true;
		for (Class parameterType : parameterTypes) {
			if (firstParam) {
				firstParam = false;
			}
			else {
				sb.append(", ");
			}
			sb.append(parameterType.getSimpleName());
		}
		sb.append(')');
		return sb.toString();
	}

}