net.e6tech.elements.common.reflection.MethodSignature Maven / Gradle / Ivy
/*
* Copyright 2015-2019 Futeh Kao
*
* 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 net.e6tech.elements.common.reflection;
import java.lang.reflect.Method;
public class MethodSignature extends Signature {
private Class returnType;
private Class[] parameterTypes;
private String signature;
private Integer hashCode;
public MethodSignature(Method method) {
super(method.getName(), method);
returnType = method.getReturnType();
parameterTypes = method.getParameterTypes();
}
@Override
public boolean equals(Object obj) {
if (obj instanceof MethodSignature) {
MethodSignature other = (MethodSignature) obj;
if (getName().equals(other.getName())) {
if (!returnType.equals(other.returnType))
return false;
return equalParamTypes(parameterTypes, other.parameterTypes);
}
}
return false;
}
@Override
public int hashCode() {
if (hashCode == null) {
hashCode = getName().hashCode() ^ returnType.hashCode();
}
return hashCode;
}
boolean equalParamTypes(Class[] params1, Class[] params2) {
/* Avoid unnecessary cloning */
if (params1.length == params2.length) {
for (int i = 0; i < params1.length; i++) {
if (params1[i] != params2[i])
return false;
}
return true;
}
return false;
}
@Override
public String toString() {
if (signature == null) {
StringBuilder b = new StringBuilder(returnType.getName());
b.append(' ').append(getName()).append('(');
boolean first = true;
for (Class cls : parameterTypes) {
if (first) {
first = false;
} else {
b.append(", ");
}
b.append(cls.getName());
}
b.append(')');
signature = b.toString();
}
return signature;
}
}