org.apache.rocketmq.shaded.ch.qos.logback.core.joran.util.beans.BeanUtil Maven / Gradle / Ivy
package org.apache.rocketmq.shaded.ch.qos.logback.core.joran.util.beans;
import java.lang.reflect.Method;
/**
* Encapsulates utility methods associated with standard java beans.
* @author urechm
*/
public class BeanUtil {
//public static final BeanUtil SINGLETON = new BeanUtil();
public static final String PREFIX_GETTER_IS = "is";
public static final String PREFIX_GETTER_GET = "get";
public static final String PREFIX_SETTER = "set";
public static final String PREFIX_ADDER = "add";
/**
*
* @param method to check if it is an 'adder' method.
* @return true if the given method is an 'adder' method.
*/
static public boolean isAdder(Method method) {
int parameterCount = getParameterCount(method);
if (parameterCount != 1) {
return false;
}
Class returnType = method.getReturnType();
if (returnType != void.class) {
return false;
}
String methodName = method.getName();
return methodName.startsWith(PREFIX_ADDER);
}
/**
*
* @param method to check if it is a standard java beans getter.
* @return true if the given method is a standard java beans getter.
*/
static public boolean isGetter(Method method) {
int parameterCount = getParameterCount(method);
if (parameterCount > 0) {
return false;
}
Class returnType = method.getReturnType();
if (returnType == void.class) {
return false;
}
String methodName = method.getName();
if (!methodName.startsWith(PREFIX_GETTER_GET) && !methodName.startsWith(PREFIX_GETTER_IS)) {
return false;
}
if (methodName.startsWith(PREFIX_GETTER_IS)) {
if (!returnType.equals(boolean.class) && !returnType.equals(Boolean.class)) {
return false;
}
}
return true;
}
static private int getParameterCount(Method method) {
return method.getParameterTypes().length;
}
/**
*
* @param method to check if it is a standard java beans setter.
* @return true if the given method is a standard java beans setter.
*/
static public boolean isSetter(Method method) {
int parameterCount = getParameterCount(method);
if (parameterCount != 1) {
return false;
}
Class returnType = method.getReturnType();
if (returnType != void.class) {
return false;
}
String methodName = method.getName();
if (!methodName.startsWith(PREFIX_SETTER)) {
return false;
}
return true;
}
/**
* @param method to get the associated property name for.
* @return The property name of the associated property if the given method matches a standard java beans getter or setter.
*/
static public String getPropertyName(Method method) {
String methodName = method.getName();
String rawPropertyName = getSubstringIfPrefixMatches(methodName, PREFIX_GETTER_GET);
if (rawPropertyName == null) {
rawPropertyName = getSubstringIfPrefixMatches(methodName, PREFIX_SETTER);
}
if (rawPropertyName == null) {
rawPropertyName = getSubstringIfPrefixMatches(methodName, PREFIX_GETTER_IS);
}
if (rawPropertyName == null) {
rawPropertyName = getSubstringIfPrefixMatches(methodName, PREFIX_ADDER);
}
return toLowerCamelCase(rawPropertyName);
}
/**
* Converts the given String into lower camel case form.
* @param string to decapitalize.
* @return null if the given String is null.
* Emtpy string if the given string is empty.
* The given string if the first two consecutive letters are in upper case.
* The given string with the first letter in lower case otherwise, which might be the given string.
*/
static public String toLowerCamelCase(String string) {
if (string == null) {
return null;
}
if (string.isEmpty()) {
return string;
}
if (string.length() > 1 && Character.isUpperCase(string.charAt(1)) && Character.isUpperCase(string.charAt(0))) {
return string;
}
char chars[] = string.toCharArray();
chars[0] = Character.toLowerCase(chars[0]);
return new String(chars);
}
static private String getSubstringIfPrefixMatches(String wholeString, String prefix) {
if (wholeString.startsWith(prefix)) {
return wholeString.substring(prefix.length());
}
return null;
}
}