jsyntaxpane.util.ReflectUtils Maven / Gradle / Ivy
/*
* Copyright 2008 Ayman Al-Sairafi [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 jsyntaxpane.util;
import java.io.File;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.net.URL;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* Reflection Utility methods
* @author Ayman Al-Sairafi
*/
public class ReflectUtils {
/**
* Adds all methods (from Class.getMethodCalls) to the list
* @param aClass
* @param list
* @return number of methods added
*/
public static int addMethods(Class aClass, List list) {
Method[] methods = aClass.getMethods();
for (Method m : methods) {
list.add(m);
}
return methods.length;
}
/**
* Adds all static methods (from Class.getMethodCalls) to the list
* @param aClass
* @param list
* @return number of methods added
*/
public static int addStaticMethods(Class aClass, List list) {
Method[] methods = aClass.getMethods();
for (Method m : methods) {
if (Modifier.isStatic(m.getModifiers())) {
list.add(m);
}
}
return methods.length;
}
/**
* Adds all static Fields (from Class.getFields) to the list
* @param aClass
* @param list
* @return number of fields added
*/
public static int addStaticFields(Class aClass, List list) {
Field[] fields = aClass.getFields();
for (Field f : fields) {
if (Modifier.isStatic(f.getModifiers())) {
list.add(f);
}
}
return fields.length;
}
/**
* Adds all Fields (from Class.getFields) to the list
* @param aClass
* @param list
* @return number of fields added
*/
public static int addFields(Class aClass, List list) {
Field[] fields = aClass.getFields();
for (Field f : fields) {
list.add(f);
}
return fields.length;
}
/**
* Adds all Constructor (from Class.getConstructorCalls) to the list
* @param aClass
* @param list
* @return number of constructors added
*/
public static int addConstrcutors(Class aClass, List list) {
Constructor[] constructors = aClass.getConstructors();
for (Constructor c : constructors) {
list.add(c);
}
return constructors.length;
}
/**
* Convert the constructor to a Java Code String
* (arguments are replaced by the simple types)
* @param c Constructor
* @return
*/
public static String getJavaCallString(Constructor c) {
StringBuilder call = new StringBuilder();
call.append(c.getDeclaringClass().getSimpleName());
addParamsString(call, c.getParameterTypes());
return call.toString();
}
/**
* Convert the Method to a Java Code String
* (arguments are replaced by the simple types)
* @param method Method
* @return
*/
public static String getJavaCallString(Method method) {
StringBuilder call = new StringBuilder();
call.append(method.getName());
addParamsString(call, method.getParameterTypes());
return call.toString();
}
/**
* Adds the class SimpleNames, comma sepearated and surrounded by paranthesis to the
* call StringBuffer
* @param call
* @param params
* @return
*/
public static StringBuilder addParamsString(StringBuilder call, Class[] params) {
call.append("(");
boolean firstArg = true;
for (Class arg : params) {
if (firstArg) {
firstArg = false;
} else {
call.append(", ");
}
call.append(arg.getSimpleName());
}
call.append(")");
return call;
}
/**
* Gets a String array of all method calls for the given class
* @param aClass
* @return
*/
public static String[] getMethodCalls(Class aClass) {
String[] methods = new String[aClass.getMethods().length];
int i = 0;
for (Method method : aClass.getMethods()) {
methods[i++] = getJavaCallString(method);
}
return methods;
}
/**
* Gets an array of all Constructor calls for the given class
* @param aClass
* @return
*/
public static String[] getConstructorCalls(Class aClass) {
Constructor[] constructors = aClass.getConstructors();
String[] cons = new String[constructors.length];
int i = 0;
for (Constructor c : constructors) {
cons[i++] = getJavaCallString(c);
}
return cons;
}
/**
* Return a paranthesis enclosed, comma sepearated String of all
* SimpleClass names in params.
* @param params
* @return
*/
public static String getParamsString(Class[] params) {
StringBuilder sb = new StringBuilder();
addParamsString(sb, params);
return sb.toString();
}
/**
* Scans all classes accessible from the context class loader which belong to the given package and subpackages.
*
* @param packageName The base package
* @return The classes
* @throws ClassNotFoundException
* @throws IOException
*/
private static Class[] getClasses(String packageName)
throws ClassNotFoundException, IOException {
// ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
ClassLoader classLoader = ClassLoader.getSystemClassLoader();
assert classLoader != null;
String path = packageName.replace('.', '/');
Enumeration resources = classLoader.getResources(path);
List dirs = new ArrayList();
while (resources.hasMoreElements()) {
URL resource = resources.nextElement();
dirs.add(new File(resource.getFile()));
}
ArrayList classes = new ArrayList();
for (File directory : dirs) {
classes.addAll(findClasses(directory, packageName));
}
return classes.toArray(new Class[classes.size()]);
}
/**
* Recursive method used to find all classes in a given directory and subdirs.
*
* @param directory The base directory
* @param packageName The package name for classes found inside the base directory
* @return The classes
* @throws ClassNotFoundException
*/
private static List findClasses(File directory, String packageName) throws ClassNotFoundException {
List classes = new ArrayList();
if (!directory.exists()) {
return classes;
}
File[] files = directory.listFiles();
for (File file : files) {
if (file.isDirectory()) {
assert !file.getName().contains(".");
classes.addAll(findClasses(file, packageName + "." + file.getName()));
} else if (file.getName().endsWith(".class")) {
classes.add(Class.forName(packageName + '.' + file.getName().substring(0, file.getName().length() - 6)));
}
}
return classes;
}
/**
* Attempt to find the given className within any of the packages.
* If the class is not found, then null is returned
* @param className Fully or partially qualified classname within any of the packages
* @param packages List of packages for search
* @return CLass object or null if not found.
*/
public static Class findClass(String className, List packages) {
try {
return Class.forName(className);
} catch (ClassNotFoundException ex) {
} catch (NoClassDefFoundError ex) {
}
for (String pack : packages) {
try {
return Class.forName(pack + "." + className);
} catch (ClassNotFoundException ex) {
} catch (NoClassDefFoundError ex) {
}
}
return null;
}
/**
* Find a setter method for the give object's property and try to call it.
* No exceptions are thrown. You typically call this method because either
* you are sure no exceptions will be thrown, or to silently ignore
* any that may be thrown.
* This will also find a setter that accepts an interface that the value
* implements.
* This is still not very effcient and should only be called if
* performance is not of an issue.
* You can check the return value to see if the call was seuccessful or
* not.
* @param obj Object to receive the call
* @param property property name (without set. First letter will be
* capitalized)
* @param value Value of the property.
* @return
*/
public static boolean callSetter(Object obj, String property, Object value) {
String key = String.format("%s.%s(%s)", obj.getClass().getName(),
property, value.getClass().getName());
Method m = null;
boolean result = false;
if(!SETTERS_MAP.containsKey(key)) {
m = findMethod(obj, property, value);
SETTERS_MAP.put(key, m);
} else {
m = SETTERS_MAP.get(key);
}
if(m != null) {
try {
m.invoke(obj, value);
result = true;
} catch (IllegalAccessException ex) {
Logger.getLogger(ReflectUtils.class.getName()).log(Level.SEVERE, null, ex);
} catch (IllegalArgumentException ex) {
Logger.getLogger(ReflectUtils.class.getName()).log(Level.SEVERE, null, ex);
} catch (InvocationTargetException ex) {
Logger.getLogger(ReflectUtils.class.getName()).log(Level.SEVERE, null, ex);
}
}
return result;
}
private static synchronized Method findMethod(Object obj,
String property, Object value) {
Method m = null;
Class theClass = obj.getClass();
String setter = String.format("set%C%s",
property.charAt(0), property.substring(1));
Class paramType = value.getClass();
while (paramType != null) {
try {
m = theClass.getMethod(setter, paramType);
return m;
} catch (NoSuchMethodException ex) {
// try on the interfaces of this class
for (Class iface : paramType.getInterfaces()) {
try {
m = theClass.getMethod(setter, iface);
return m;
} catch (NoSuchMethodException ex1) {
}
}
paramType = paramType.getSuperclass();
}
}
return m;
}
public static final List DEFAULT_PACKAGES = new ArrayList(3);
static {
DEFAULT_PACKAGES.add("java.lang");
DEFAULT_PACKAGES.add("java.util");
DEFAULT_PACKAGES.add("jsyntaxpane");
}
/**
* To speed up find setter methods, this map will be used.
* The Key String will be of the format objectClass.property(valueclass)
* Where:
* objectClass = obj.getClass().getName
* property = property (as passed in to callSetter), before set is appended
* valueCLass = value.getClass().getName()
* The Method will be either the method, or null if a search was not and no
* method is found.
*/
private static HashMap SETTERS_MAP = new HashMap();
}
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