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/*
* Copyright (c) 2017. Eric Angeli
*
* Permission is hereby granted, free of charge,
* to any person obtaining a copy of this software
* and associated documentation files (the "Software"),
* to deal in the Software without restriction,
* including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit
* persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission
* notice shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
* AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
package com.thegoate.annotations;
import com.thegoate.logging.BleatBox;
import com.thegoate.logging.BleatFactory;
import com.thegoate.reflection.GoateReflection;
import org.atteo.classindex.ClassIndex;
import java.lang.annotation.Annotation;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
/**
* Simple factory that can be used to lookup classes that are annotated.
* Created by gtque on 4/24/2017.
*/
public class AnnotationFactory {
protected static final BleatBox LOG = BleatFactory.getLogger(AnnotationFactory.class);
public static volatile Map> directory = new ConcurrentHashMap<>();
public AnnotationFactory() {
if (directory == null) {
directory = new ConcurrentHashMap<>();
}
}
Object id;
String methodId;
Constructor constructor = null;
Object[] constructorArgs = new Object[0];
Method check = null;
Class annotation;
Class methodAnnotation;
boolean setDefault = false;
String checkName = null;
public AnnotationFactory clear() {
id = null;
methodId = null;
constructorArgs = new Object[0];
constructor = null;
check = null;
annotation = null;
methodAnnotation = null;
setDefault = false;
return this;
}
public AnnotationFactory doDefault() {
setDefault = true;
return this;
}
public AnnotationFactory findByMethod(String id) {
this.methodId = id;
return this;
}
public AnnotationFactory find(Object id) {
this.id = id;
return this;
}
public AnnotationFactory buildUsing(Constructor constructor) {
this.constructor = constructor;
return this;
}
public AnnotationFactory using(String check) {
if (annotation != null) {
try {
using(annotation.getMethod(check));
} catch (NoSuchMethodException e) {
LOG.error("could not find the identifying method: " + check);
}
}
this.checkName = check;
return this;
}
public AnnotationFactory using(Method check) {
this.check = check;
return this;
}
public AnnotationFactory annotatedWith(Class annotation) {
this.annotation = annotation;
if (checkName != null) {
using(checkName);
}
return this;
}
public Map getDirectory(String dir) {
return getDirectory(dir, null, null);
}
public Map getDirectory(String dir, String id, Method identifier) {
buildDirectory();
Map unfiltered = directory.get(dir);
Map filtered = new ConcurrentHashMap<>();
if (id != null && identifier != null) {
for (String key : unfiltered.keySet()) {
try {
Class temp = unfiltered.get(key);
Annotation service = temp.getAnnotation(annotation);
if (identifier != null) {
Object theCheck = identifier.invoke(service);
if (theCheck != null && theCheck.equals(id)) {
filtered.put(key, temp);
}
}
} catch (Exception e) {
LOG.error("Problem checking the class: " + e.getMessage(), e);
}
}
}
return (id != null && identifier != null) ? filtered : unfiltered;
}
public AnnotationFactory methodAnnotatedWith(Class annotation) {
this.methodAnnotation = annotation;
return this;
}
public AnnotationFactory constructorArgs(Object[] args) {
this.constructorArgs = args;
return this;
}
public Class lookUp() {
buildDirectory();
Class c = null;
LOG.debug("looking for " + annotation.getName());
String theClass = ""+id;
try {
c = directory.get(annotation.getCanonicalName()).get(theClass);
} catch (NullPointerException e) {
LOG.error("could not get the class: " + theClass + "; " + e.getMessage(), e);
}
return c;
}
public Object build() throws IllegalAccessException, InstantiationException, InvocationTargetException {
buildDirectory();
Class c = methodId == null ? lookUp() : lookUpByAnnotatedMethod();
return build(c);
}
/**
* The listings for each annotation is generated only one time, the first time they are looked up.
*
* @return The instance of itself, syntactic sugar for stringing calls together.
*/
public synchronized AnnotationFactory buildDirectory() {
if (!directory.containsKey(annotation.getCanonicalName())) {
directory.put(annotation.getCanonicalName(), new ConcurrentHashMap<>());
}
Map listing = directory.get(annotation.getCanonicalName());
if (listing.size() == 0) {
if(LOG!=null) {
LOG.debug("Building Directory "+annotation.getCanonicalName(), "the listing was empty, trying to build it.");
}
Iterable> klasses = ClassIndex.getAnnotated(annotation);
for (Class klass : klasses) {
String theClass = klass.getCanonicalName();
if(LOG!=null) {
LOG.debug("Adding to directory", theClass);
}
try {
Class temp = Class.forName(theClass);
Annotation service = temp.getAnnotation(annotation);
String aid = theClass;
if (check != null) {
Object theCheck = check.invoke(service);
if (theCheck != null && theCheck.getClass().isArray()) {
for (Object aido : (Object[]) theCheck) {
listing.put("" + aido, klass.forName(theClass));
}
} else {
listing.put("" + theCheck, klass.forName(theClass));
}
} else {
listing.put(temp.getCanonicalName(), klass.forName(theClass));//default to using the full class name.
}
if (setDefault) {
Annotation def = temp.getAnnotation(IsDefault.class);
if (def != null) {
listing.put("default", temp);
}
}
} catch (ClassNotFoundException | NullPointerException | IllegalAccessException | InvocationTargetException e) {
LOG.error("could not get the class: " + theClass + "; " + e.getMessage(), e);
} catch (NoClassDefFoundError ncdfe) {
LOG.error("Build Directory", "This shouldn't have happened, but a class in the list was not found." + ncdfe.getMessage(), ncdfe);
}
}
}
return this;
}
public AnnotationFactory constructor(Constructor constructor) {
this.constructor = constructor;
return this;
}
public Object build(Class klass) throws IllegalAccessException, InstantiationException, InvocationTargetException {
Object o = null;
if (klass != null) {
if (constructorArgs != null) {
Object[] ca = constructorArgs;
if (constructor == null) {
constructor = new GoateReflection().findConstructor(klass.getConstructors(), constructorArgs);
if(constructor == null){
// LOG.debug("Build Class", "didn't find specific constructor, checking for default constructor");
constructor = new GoateReflection().findConstructor(klass.getConstructors(), new Object[0]);
ca = new Object[0];
}
}
if (constructor != null) {
try {
// if(ca!=null) {
o = constructor.newInstance(ca);
// } else {
// o = constructor.newInstance();
// }
}catch(IllegalAccessException | InstantiationException | InvocationTargetException e){
LOG.debug("Building Class", "Problem instantiating a new instances: " + e.getMessage(), e);
throw e;
}
} else {
LOG.info("Building Class", "Could not find the constructor, wil check for a default constructor...");
}
} else {
o = klass.newInstance();
}
} else {
LOG.debug("Building Class", "The class was not specified, definitely could not build it.");
}
return o;
}
public Class lookUpByAnnotatedMethod() {
buildDirectory();
LOG.debug("Look Up Annotated Method", "Trying to look up an annotated method: " + methodId);
Class klass = null;
Map listings = directory.get(annotation.getCanonicalName());
for (String theClass : listings.keySet()) {
LOG.debug("Checking Class", theClass);
List methods = new GoateReflection().getDeclaredMethods(listings.get(theClass));
LOG.debug("Methods to check ("+methods.size()+")", methods.toString());
for (Method m : methods) {
if (m.isAnnotationPresent(methodAnnotation)) {
for (Method am : methodAnnotation.getDeclaredMethods()) {
Annotation dam = m.getAnnotation(methodAnnotation);
try {
LOG.debug("Checking Method", am.getName());
if (methodId.equals(am.invoke(dam))) {
klass = listings.get(theClass);
break;
}
} catch (IllegalAccessException | InvocationTargetException e) {
LOG.debug("Look Up Annotated Method", "Problem accessing method: " + e.getMessage(), e);
}
}
if (klass != null) {
break;
}
}
}
}
return klass;
}
public Method getMethod() {
buildDirectory();
Map listings = directory.get(annotation.getCanonicalName());
Method method = null;
for (String theClass : listings.keySet()) {
List methods = new GoateReflection().getDeclaredMethods(listings.get(theClass));
for (Method m : methods) {
if (m.isAnnotationPresent(methodAnnotation)) {
for (Method am : methodAnnotation.getDeclaredMethods()) {
Annotation dam = m.getAnnotation(methodAnnotation);
try {
if (methodId.equals(am.invoke(dam))) {
method = m;
break;
}
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
}
}
if (method != null) {
break;
}
}
}
}
return method;
}
}
