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package com.j256.simplejmx.common;
import javax.management.ObjectName;
/**
* Utility class that creates {@link ObjectName} objects from various arguments.
*
* @author graywatson
*/
public class ObjectNameUtil {
private ObjectNameUtil() {
// only for static methods
}
/**
* Constructs an object-name from a jmx-resource and a self naming object.
*
* @param jmxResource
* Annotation from the class for which we are creating our ObjectName. It may be null.
* @param selfNamingObj
* Object that implements the self-naming interface.
* @throws IllegalArgumentException
* If we had problems building the name
*/
public static ObjectName makeObjectName(JmxResource jmxResource, JmxSelfNaming selfNamingObj) {
String domainName = selfNamingObj.getJmxDomainName();
if (domainName == null) {
if (jmxResource != null) {
domainName = jmxResource.domainName();
}
if (isEmpty(domainName)) {
throw new IllegalArgumentException(
"Could not create ObjectName because domain name not specified in getJmxDomainName() nor @JmxResource");
}
}
String beanName = selfNamingObj.getJmxBeanName();
if (beanName == null) {
if (jmxResource != null) {
beanName = getBeanName(jmxResource);
}
if (isEmpty(beanName)) {
beanName = selfNamingObj.getClass().getSimpleName();
}
}
String[] jmxResourceFolders = null;
if (jmxResource != null) {
jmxResourceFolders = jmxResource.folderNames();
}
return makeObjectName(domainName, beanName, selfNamingObj.getJmxFolderNames(), jmxResourceFolders);
}
/**
* Constructs an object-name from a self naming object only.
*
* @param selfNamingObj
* Object that implements the self-naming interface.
* @throws IllegalArgumentException
* If we had problems building the name
*/
public static ObjectName makeObjectName(JmxSelfNaming selfNamingObj) {
JmxResource jmxResource = selfNamingObj.getClass().getAnnotation(JmxResource.class);
return makeObjectName(jmxResource, selfNamingObj);
}
/**
* Constructs an object-name from a jmx-resource and a object which is not self-naming.
*
* @param jmxResource
* Annotation from the class for which we are creating our ObjectName.
* @param obj
* Object for which we are creating our ObjectName
* @throws IllegalArgumentException
* If we had problems building the name
*/
public static ObjectName makeObjectName(JmxResource jmxResource, Object obj) {
String domainName = jmxResource.domainName();
if (isEmpty(domainName)) {
throw new IllegalArgumentException(
"Could not create ObjectName because domain name not specified in @JmxResource");
}
String beanName = getBeanName(jmxResource);
if (beanName == null) {
beanName = obj.getClass().getSimpleName();
}
return makeObjectName(domainName, beanName, null, jmxResource.folderNames());
}
/**
* Constructs an object-name from a domain-name, object-name, and folder-name strings.
*
* @param domainName
* This is the top level folder name for the beans.
* @param beanName
* This is the bean name in the lowest folder level.
* @param folderNameStrings
* These can be used to setup folders inside of the top folder. Each of the entries in the array can
* either be in "value" or "name=value" format.
* @throws IllegalArgumentException
* If we had problems building the name
*/
public static ObjectName makeObjectName(String domainName, String beanName, String[] folderNameStrings) {
return makeObjectName(domainName, beanName, null, folderNameStrings);
}
/**
* Constructs an object-name from a domain-name and object-name.
*
* @param domainName
* This corresponds to the {@link JmxResource#domainName()} and is the top level folder name for the
* beans.
* @param beanName
* This corresponds to the {@link JmxResource#beanName()} and is the bean name in the lowest folder
* level.
* @throws IllegalArgumentException
* If we had problems building the name
*/
public static ObjectName makeObjectName(String domainName, String beanName) {
return makeObjectName(domainName, beanName, null, null);
}
/**
* Constructs an object-name from a string suitable to be passed to the {@link ObjectName} constructor.
*
* @param objectNameString
* The entire object-name string in the form of something like
* your.domain:folder=1,name=beanBean
* @throws IllegalArgumentException
* If we had problems building the name
*/
public static ObjectName makeObjectName(String objectNameString) {
try {
return new ObjectName(objectNameString);
} catch (Exception e) {
throw new IllegalArgumentException("Invalid ObjectName generated: " + objectNameString, e);
}
}
/**
* Constructs an object-name from an object that is detected either having the {@link JmxResource} annotation or
* implementing {@link JmxSelfNaming}.
*
* @param obj
* Object for which we are creating our ObjectName
* @throws IllegalArgumentException
* If we had problems building the name
*/
public static ObjectName makeObjectName(Object obj) {
JmxResource jmxResource = obj.getClass().getAnnotation(JmxResource.class);
if (obj instanceof JmxSelfNaming) {
return makeObjectName(jmxResource, (JmxSelfNaming) obj);
} else {
if (jmxResource == null) {
throw new IllegalArgumentException(
"Registered class must either implement JmxSelfNaming or have JmxResource annotation");
}
return makeObjectName(jmxResource, obj);
}
}
private static ObjectName makeObjectName(String domainName, String beanName, JmxFolderName[] folderNames,
String[] folderNameStrings) {
// j256:00=clients,name=Foo
StringBuilder sb = new StringBuilder();
sb.append(domainName);
sb.append(':');
boolean first = true;
int prefixC = 0;
/*
* Self-naming takes precedence over the @JmxResource folder-name strings.
*/
if (folderNames != null) {
for (JmxFolderName folderName : folderNames) {
if (first) {
first = false;
} else {
sb.append(',');
}
String fieldName = folderName.getField();
if (fieldName == null) {
appendNumericalPrefix(sb, prefixC++);
} else {
sb.append(fieldName);
}
sb.append('=');
sb.append(folderName.getValue());
}
} else if (folderNameStrings != null) {
for (String folderNameString : folderNameStrings) {
if (first) {
first = false;
} else {
sb.append(',');
}
// if we have no = then prepend a number
if (folderNameString.indexOf('=') == -1) {
appendNumericalPrefix(sb, prefixC++);
sb.append('=');
}
sb.append(folderNameString);
}
}
if (!first) {
sb.append(',');
}
sb.append("name=");
sb.append(beanName);
String objectNameString = sb.toString();
return makeObjectName(objectNameString);
}
private static void appendNumericalPrefix(StringBuilder sb, int prefixC) {
if (prefixC < 10) {
sb.append('0');
}
sb.append(prefixC);
}
private static String getBeanName(JmxResource jmxResource) {
String beanName = jmxResource.beanName();
if (isEmpty(beanName)) {
return null;
} else {
return beanName;
}
}
private static boolean isEmpty(String str) {
return (str == null || str.length() == 0);
}
}
