org.apache.commons.javaflow.utils.ReflectionUtils Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.commons.javaflow.utils;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public final class ReflectionUtils {
private final static Log log = LogFactory.getLog(ReflectionUtils.class);
public interface Matcher {
boolean matches(final String pName);
}
public interface Indexer {
void put(final Map pMap, final String pKey, final Object pObject);
}
private static Indexer defaultIndexer = new DefaultIndexer();
private static Matcher defaultMatcher = new DefaultMatcher();
public static class DefaultMatcher implements Matcher {
public boolean matches(final String pName) {
return true;
}
}
public static class DefaultIndexer implements Indexer {
public void put(final Map pMap, final String pKey, final Object pObject) {
pMap.put(pKey, pObject);
}
}
public static Map discoverFields(
final Class pClazz,
final Matcher pMatcher
) {
return discoverFields(pClazz, pMatcher, defaultIndexer);
}
public static Map discoverFields(
final Class pClazz
) {
return discoverFields(pClazz, defaultMatcher, defaultIndexer);
}
public static Map discoverFields(
final Class pClazz,
final Matcher pMatcher,
final Indexer pIndexer
) {
log.debug("discovering fields on " + pClazz.getName());
final Map result = new HashMap();
Class current = pClazz;
do {
final Field[] fields = current.getDeclaredFields();
for (int i = 0; i < fields.length; i++) {
final String fname = fields[i].getName();
if (pMatcher.matches(fname)) {
pIndexer.put(result, fname, fields[i]);
log.debug("discovered field " + fname + " -> " + fields[i]);
}
}
current = current.getSuperclass();
} while(current != null);
return result;
}
public static Map discoverMethods(
final Class pClazz,
final Matcher pMatcher
) {
return discoverMethods(pClazz, pMatcher, defaultIndexer);
}
public static Map discoverMethods(
final Class pClazz
) {
return discoverMethods(pClazz, defaultMatcher, defaultIndexer);
}
public static Map discoverMethods(
final Class pClazz,
final Matcher pMatcher,
final Indexer pIndexer
) {
log.debug("discovering methods on " + pClazz.getName());
final Map result = new HashMap();
Class current = pClazz;
do {
final Method[] methods = current.getDeclaredMethods();
for (int i = 0; i < methods.length; i++) {
final String mname = methods[i].getName();
if (pMatcher.matches(mname)) {
pIndexer.put(result, mname, methods[i]);
log.debug("discovered method " + mname + " -> " + methods[i]);
}
}
current = current.getSuperclass();
} while(current != null);
return result;
}
public static Object cast(Object o) throws IOException, ClassNotFoundException {
final ByteArrayOutputStream buffer = new ByteArrayOutputStream();
final ObjectOutputStream oos = new ObjectOutputStream(buffer);
oos.writeObject(o);
oos.flush();
final ObjectInputStream ois = new ObjectInputStream(new ByteArrayInputStream(buffer.toByteArray()));
return ois.readObject();
}
public static String getClassName(final Object o) {
if (o == null) {
return "unknown";
}
return o.getClass().getName() + "@" + o.hashCode();
}
public static String getClassLoaderName(final Object o) {
if (o == null) {
return "unknown";
}
return getClassName(o.getClass().getClassLoader());
}
}