net.sf.common.util.ReflectionUtils Maven / Gradle / Ivy
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/**
* Copyright 2011-2013 the original author or authors.
*
* 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.sf.common.util;
import java.io.IOException;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import java.util.concurrent.ConcurrentHashMap;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.core.type.ClassMetadata;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.core.type.classreading.MetadataReaderFactory;
import org.springframework.core.type.classreading.SimpleMetadataReaderFactory;
import org.springframework.util.ClassUtils;
import org.springframework.util.StringUtils;
/**
* @author Steve M. Jung
* @since 2011. 6. 9. (version 0.0.1)
*/
public class ReflectionUtils {
private static final Logger logger = LoggerFactory.getLogger(ReflectionUtils.class);
@SuppressWarnings("unused")
private static final String NULL = null;
public static final Field NULL_FIELD;
static {
Field nullField = null;
try {
nullField = ReflectionUtils.class.getDeclaredField("NULL");
} catch (SecurityException e) {
nullField = null;
logger.warn(e.getMessage(), e);
} catch (NoSuchFieldException e) {
nullField = null;
logger.warn(e.getMessage(), e);
} finally {
NULL_FIELD = nullField;
}
}
public static void clear() {
logger.info("Clearing ReflectionUtils...");
fieldListCache.clear();
fieldByNameCache.clear();
}
private static final ResourcePatternResolver RESOURCE_PATTERN_RESOLVER = new PathMatchingResourcePatternResolver();
private static final MetadataReaderFactory METADATA_READER_FACTORY = new SimpleMetadataReaderFactory();
private static final List ORDERBY_LIST = ValueUtils.toList("name", "simpleName");
public static List> getClassList(String locationPattern, String orderBy) {
ValueUtils.assertNotEmpty("locationPattern", locationPattern);
final String _orderBy = ValueUtils.isEmpty(orderBy) ? "name" : orderBy;
if (!ORDERBY_LIST.contains(_orderBy))
throw new IllegalArgumentException("Unsupported orderBy: " + _orderBy);
locationPattern = locationPattern.trim();
if (!locationPattern.endsWith(".class"))
locationPattern = locationPattern + ".class";
Resource[] resources;
try {
resources = RESOURCE_PATTERN_RESOLVER.getResources(locationPattern);
} catch (IOException e) {
throw new IllegalArgumentException("Maybe invalid locationPattern: " + locationPattern);
}
if (ValueUtils.isEmpty(resources))
return new ArrayList>(0);
Map> map = new TreeMap>();
for (Resource resource : resources) {
if (!resource.isReadable() || !resource.getFilename().endsWith(".class"))
continue;
MetadataReader metadataReader;
try {
metadataReader = METADATA_READER_FACTORY.getMetadataReader(resource);
} catch (IOException e) {
logger.warn(e.getMessage());
continue;
}
ClassMetadata classMetadata = metadataReader.getClassMetadata();
if (classMetadata == null || !classMetadata.isConcrete())
continue;
Class clazz;
try {
clazz = ClassUtils.forName(classMetadata.getClassName(), null);
} catch (ClassNotFoundException e) {
logger.warn(e.getMessage());
continue;
} catch (LinkageError e) {
logger.warn(e.getMessage());
continue;
}
map.put("name".equals(_orderBy) ? clazz.getName() : clazz.getSimpleName(), clazz);
}
List> list = new ArrayList>(map.values());
return list;
}
public static List getClassNameList(final String locationPattern, String orderBy) {
final String _orderBy = ValueUtils.isEmpty(orderBy) ? "name" : orderBy;
if (!ORDERBY_LIST.contains(_orderBy))
throw new IllegalArgumentException("Unsupported orderBy: " + _orderBy);
Resource[] resources;
try {
resources = RESOURCE_PATTERN_RESOLVER.getResources(locationPattern);
} catch (IOException e) {
throw new IllegalArgumentException("Maybe invalid locationPattern: " + locationPattern);
}
if (ValueUtils.isEmpty(resources))
return new ArrayList(0);
Map map = new TreeMap();
for (Resource resource : resources) {
if (!resource.isReadable() || !resource.getFilename().endsWith(".class"))
continue;
MetadataReader metadataReader;
try {
metadataReader = METADATA_READER_FACTORY.getMetadataReader(resource);
} catch (IOException e) {
logger.warn(e.getMessage());
continue;
}
ClassMetadata classMetadata = metadataReader.getClassMetadata();
if (classMetadata == null || !classMetadata.isConcrete())
continue;
String className = classMetadata.getClassName();
if (className.contains("."))
map.put("name".equals(_orderBy) ? className : className.substring(className.indexOf("." + 1)), className);
else
map.put(className, className);
}
List list = new ArrayList(map.values());
return list;
}
public static Method getGetter(Object obj, String fieldName, Class requiredType) {
ValueUtils.assertNotNull("obj", obj);
ValueUtils.assertNotNull("fieldName", fieldName);
Class clazz = obj instanceof Class ? (Class) obj : obj.getClass();
String getterName = toGetterName(fieldName);
String isName = toIsName(fieldName);
Method isMethod = null;
for (Method method : clazz.getMethods()) {
if (!method.getName().equals(getterName)) {
if (method.getName().equals(isName) && boolean.class.isAssignableFrom(method.getReturnType())
&& (requiredType == null || method.getReturnType().isAssignableFrom(requiredType)))
isMethod = method;
continue;
}
if (!void.class.equals(method.getReturnType()) && ValueUtils.isEmpty(method.getParameterTypes())
&& (requiredType == null || method.getReturnType().isAssignableFrom(requiredType)))
return method;
}
return isMethod;
}
public static Method getSetter(Object obj, String fieldName, Class requiredType) {
ValueUtils.assertNotNull("obj", obj);
ValueUtils.assertNotNull("fieldName", fieldName);
Class clazz = obj instanceof Class ? (Class) obj : obj.getClass();
String setterName = toSetterName(fieldName);
for (Method method : clazz.getMethods()) {
if (!method.getName().equals(setterName))
continue;
if (void.class.equals(method.getReturnType()) && !ValueUtils.isEmpty(method.getParameterTypes())
&& method.getParameterTypes().length == 1
&& (requiredType == null || method.getParameterTypes()[0].isAssignableFrom(requiredType)))
return method;
}
return null;
}
private static String toIsName(String fieldName) {
return "is" + toMethodName(fieldName);
}
private static String toGetterName(String fieldName) {
return "get" + toMethodName(fieldName);
}
private static String toSetterName(String fieldName) {
return "set" + toMethodName(fieldName);
}
private static String toMethodName(String fieldName) {
if (fieldName.length() == 1)
return fieldName.toUpperCase();
char c = fieldName.charAt(1);
if (c > 96 && c < 123)
return StringUtils.capitalize(fieldName);
return fieldName;
}
public static Field getField(Object obj, String name) {
ValueUtils.assertNotNull("obj", obj);
ValueUtils.assertNotNull("name", name);
Class clazz = obj instanceof Class ? (Class) obj : obj.getClass();
if (clazz.equals(Object.class))
return null;
Field field = null;
try {
field = clazz.getDeclaredField(name);
return field;
} catch (SecurityException e) {
return null;
} catch (NoSuchFieldException e) {
field = getField(clazz.getSuperclass(), name);
return field;
} finally {
if (field != null && !field.isAccessible())
field.setAccessible(true);
}
}
private static Map, List> fieldListCache = new ConcurrentHashMap, List>();
public static List getFieldList(Object obj, boolean cache) {
ValueUtils.assertNotNull("obj", obj);
Class clazz = obj instanceof Class ? (Class) obj : obj.getClass();
if (fieldListCache.containsKey(clazz))
return fieldListCache.get(clazz);
if (cache) {
loadFieldCache(clazz);
return fieldListCache.get(clazz);
}
List list = new ArrayList();
populateFieldInfo(list, null, clazz);
return list;
}
private static Map, Map> fieldByNameCache = new ConcurrentHashMap, Map>();
public static Map getFieldByNameMap(Object obj, boolean cache) {
ValueUtils.assertNotNull("obj", obj);
Class clazz = obj instanceof Class ? (Class) obj : obj.getClass();
if (fieldByNameCache.containsKey(clazz))
return fieldByNameCache.get(clazz);
if (cache) {
loadFieldCache(clazz);
return fieldByNameCache.get(clazz);
}
Map nameFieldMap = new HashMap();
populateFieldInfo(null, nameFieldMap, clazz);
return nameFieldMap;
}
private static void loadFieldCache(final Class clazz) {
SyncCtrlUtils.wrap("ReflectionUtils.fieldList." + clazz.getName(), fieldListCache, clazz, new Closure, RuntimeException>() {
public List execute() {
List fieldList = new ArrayList();
Map nameFieldMap = new HashMap();
populateFieldInfo(fieldList, nameFieldMap, clazz);
fieldByNameCache.put(clazz, nameFieldMap);
return fieldList;
}
});
}
private static void populateFieldInfo(List fieldList, Map nameFieldMap, Class clazz) {
if (clazz == null || clazz.equals(Object.class))
return;
populateFieldInfo(fieldList, nameFieldMap, clazz.getSuperclass());
for (Field field : clazz.getDeclaredFields()) {
if (Modifier.isStatic(field.getModifiers()))
continue;
if (!field.isAccessible())
field.setAccessible(true);
if (fieldList != null)
fieldList.add(field);
if (nameFieldMap != null)
nameFieldMap.put(field.getName(), field);
}
}
public static List getActualTypeList(Type genericType) {
ValueUtils.assertNotNull("genericType", genericType);
if (genericType instanceof ParameterizedType) {
ParameterizedType parameterizedType = (ParameterizedType) genericType;
return ValueUtils.toList(parameterizedType.getActualTypeArguments());
}
throw new IllegalArgumentException("Couldn't extract actual types of genericType: " + genericType);
}
}
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