net.arnx.jsonic.util.ClassUtil Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jsonic Show documentation
Show all versions of jsonic Show documentation
simple json encoder/decoder for java
/*
* Copyright 2007-2011 Hidekatsu Izuno
*
* 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.arnx.jsonic.util;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamException;
import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.WildcardType;
import java.util.Arrays;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.WeakHashMap;
import java.io.ObjectStreamClass;
public final class ClassUtil {
private static final Map>> cache =
new WeakHashMap>>();
public static Class findClass(String name) {
ClassLoader cl;
try {
cl = Thread.currentThread().getContextClassLoader();
} catch (SecurityException e) {
cl = null;
}
Map> map;
synchronized (cache) {
map = cache.get(cl);
if (map == null) {
map = new LinkedHashMap>(16, 0.75f, true) {
protected boolean removeEldestEntry(Map.Entry> eldest) {
return size() > 1024;
};
};
cache.put(cl, map);
}
}
synchronized (map) {
if (!map.containsKey(name)) {
Class target;
try {
if (cl != null) {
target = cl.loadClass(name);
} else {
target = Class.forName(name);
}
} catch (ClassNotFoundException e) {
target = null;
}
map.put(name, target);
}
return map.get(name);
}
}
public static void clear() {
synchronized (cache) {
cache.clear();
}
}
public static String toUpperCamel(String name) {
StringBuilder sb = new StringBuilder(name.length());
boolean toUpperCase = true;
for (int i = 0; i < name.length(); i++) {
char c = name.charAt(i);
if (c == ' ' || c == '_' || c == '-') {
toUpperCase = true;
} else if (toUpperCase) {
sb.append(Character.toUpperCase(c));
toUpperCase = false;
} else {
sb.append(c);
}
}
return sb.toString();
}
public static String toLowerCamel(String name) {
StringBuilder sb = new StringBuilder(name.length());
boolean toUpperCase = false;
for (int i = 0; i < name.length(); i++) {
char c = name.charAt(i);
if (c == ' ' || c == '_' || c == '-') {
toUpperCase = true;
} else if (toUpperCase) {
sb.append(Character.toUpperCase(c));
toUpperCase = false;
} else {
sb.append(c);
}
}
if (sb.length() > 1 && Character.isUpperCase(sb.charAt(0)) && !Character.isUpperCase(sb.charAt(1))) {
sb.setCharAt(0, Character.toLowerCase(sb.charAt(0)));
}
return sb.toString();
}
public static Class getRawType(Type t) {
if (t instanceof Class) {
return (Class)t;
} else if (t instanceof ParameterizedType) {
return (Class)((ParameterizedType)t).getRawType();
} else if (t instanceof GenericArrayType) {
Class cls = null;
try {
cls = Array.newInstance(getRawType(((GenericArrayType)t).getGenericComponentType()), 0).getClass();
} catch (Exception e) {
throw new RuntimeException(e);
}
return cls;
} else if (t instanceof WildcardType) {
Type[] types = ((WildcardType)t).getUpperBounds();
return (types.length > 0) ? getRawType(types[0]) : Object.class;
} else {
return Object.class;
}
}
public static ParameterizedType resolveParameterizedType(Type t, Class baseClass) {
Class raw = getRawType(t);
if (t instanceof ParameterizedType && baseClass.isAssignableFrom(raw)) {
return (ParameterizedType)t;
}
ParameterizedType pt = null;
if (raw.getSuperclass() != null && raw.getSuperclass() != Object.class) {
pt = resolveParameterizedType(raw.getGenericSuperclass(), baseClass);
if (pt != null) return pt;
}
if (!raw.isInterface()) {
for (Type ifs : raw.getGenericInterfaces()) {
pt = resolveParameterizedType(ifs, baseClass);
if (pt != null) return pt;
}
}
return null;
}
public static byte[] serialize(Object o) throws ObjectStreamException {
ByteArrayOutputStream array = new ByteArrayOutputStream();
ObjectOutputStream out = null;
try {
out = new ObjectOutputStream(array);
out.writeObject(o);
out.close();
} catch (ObjectStreamException e) {
throw e;
} catch (IOException e) {
// no handle
}
return array.toByteArray();
}
public static Object deserialize(byte[] data) throws ObjectStreamException, ClassNotFoundException {
Object ret = null;
ObjectInputStream in = null;
try {
in = new ContextObjectInputStream(new ByteArrayInputStream(data));
ret = in.readObject();
in.close();
} catch (ObjectStreamException e) {
throw e;
} catch (IOException e) {
// no handle
}
return ret;
}
public static int hashCode(Object target) {
if (target == null) return 0;
final int prime = 31;
int result = 1;
Class current = target.getClass();
do {
for (Field f : current.getDeclaredFields()) {
if (Modifier.isStatic(f.getModifiers())
|| Modifier.isTransient(f.getModifiers())
|| f.isSynthetic()) {
continue;
}
Object self;
try {
f.setAccessible(true);
self = f.get(target);
} catch (IllegalAccessException e) {
throw new IllegalStateException(e);
}
if (self == null) {
result = prime * result + 0;
} else if (self.getClass().isArray()) {
if (self.getClass().equals(boolean[].class)) {
result = prime * result + Arrays.hashCode((boolean[])self);
} else if (self.getClass().equals(char[].class)) {
result = prime * result + Arrays.hashCode((char[])self);
} else if (self.getClass().equals(byte[].class)) {
result = prime * result + Arrays.hashCode((byte[])self);
} else if (self.getClass().equals(short[].class)) {
result = prime * result + Arrays.hashCode((short[])self);
} else if (self.getClass().equals(int[].class)) {
result = prime * result + Arrays.hashCode((int[])self);
} else if (self.getClass().equals(long[].class)) {
result = prime * result + Arrays.hashCode((long[])self);
} else if (self.getClass().equals(float[].class)) {
result = prime * result + Arrays.hashCode((float[])self);
} else if (self.getClass().equals(double[].class)) {
result = prime * result + Arrays.hashCode((double[])self);
} else {
result = prime * result + Arrays.hashCode((Object[])self);
}
} else {
result = prime * result + self.hashCode();
}
System.out.println(f.getName() + ": " + result);
}
current = current.getSuperclass();
} while (!Object.class.equals(current));
return result;
}
public static boolean equals(Object target, Object o) {
if (target == o) return true;
if (target == null || o == null) return false;
if (!target.getClass().equals(o.getClass())) return false;
Class current = target.getClass();
do {
for (Field f : current.getDeclaredFields()) {
if (Modifier.isStatic(f.getModifiers())
|| Modifier.isTransient(f.getModifiers())
|| f.isSynthetic()) {
continue;
}
Object self;
Object other;
try {
f.setAccessible(true);
self = f.get(target);
other = f.get(o);
} catch (IllegalAccessException e) {
throw new IllegalStateException(e);
}
if (self == null) {
if (other != null) return false;
} else if (self.getClass().isArray()) {
if (self.getClass().equals(boolean[].class)) {
if (!Arrays.equals((boolean[])self, (boolean[])other)) return false;
} else if (self.getClass().equals(char[].class)) {
if (!Arrays.equals((char[])self, (char[])other)) return false;
} else if (self.getClass().equals(byte[].class)) {
if (!Arrays.equals((byte[])self, (byte[])other)) return false;
} else if (self.getClass().equals(short[].class)) {
if (!Arrays.equals((short[])self, (short[])other)) return false;
} else if (self.getClass().equals(int[].class)) {
if (!Arrays.equals((int[])self, (int[])other)) return false;
} else if (self.getClass().equals(long[].class)) {
if (!Arrays.equals((long[])self, (long[])other)) return false;
} else if (self.getClass().equals(float[].class)) {
if (!Arrays.equals((float[])self, (float[])other)) return false;
} else if (self.getClass().equals(double[].class)) {
if (!Arrays.equals((double[])self, (double[])other)) return false;
} else {
if (!Arrays.equals((Object[])self, (Object[])other)) return false;
}
} else if (!self.equals(other)) {
return false;
}
}
current = current.getSuperclass();
} while (!Object.class.equals(current));
return true;
}
public static String toString(Object target) {
if (target == null) return "null";
BeanInfo info = BeanInfo.get(target.getClass());
StringBuilder sb = new StringBuilder(10 * info.getProperties().size() + 20);
sb.append(target.getClass().getSimpleName()).append(" [");
boolean first = true;
for (PropertyInfo prop : info.getProperties()) {
if (!prop.isReadable() || prop.getName().equals("class")) continue;
if (!first) {
sb.append(", ");
} else {
first = false;
}
sb.append(prop.getName()).append("=");
try {
Object value = prop.get(target);
if (value.getClass().isArray()) {
if (value instanceof boolean[]) {
Arrays.toString((boolean[])value);
} else if (value instanceof char[]) {
Arrays.toString((char[])value);
} else if (value instanceof byte[]) {
Arrays.toString((byte[])value);
} else if (value instanceof short[]) {
Arrays.toString((short[])value);
} else if (value instanceof int[]) {
Arrays.toString((int[])value);
} else if (value instanceof long[]) {
Arrays.toString((long[])value);
} else if (value instanceof float[]) {
Arrays.toString((float[])value);
} else if (value instanceof double[]) {
Arrays.toString((double[])value);
} else {
Arrays.toString((Object[])value);
}
} else {
sb.append(value);
}
} catch (Exception e) {
sb.append("?");
}
}
sb.append("]");
return sb.toString();
}
private ClassUtil() {
}
private static class ContextObjectInputStream extends ObjectInputStream {
public ContextObjectInputStream(InputStream in) throws IOException {
super(in);
}
@Override
protected Class resolveClass(ObjectStreamClass desc) throws IOException, ClassNotFoundException {
ClassLoader cl = Thread.currentThread().getContextClassLoader();
try {
return Class.forName(desc.getName(), true, cl);
} catch (Exception e) {
return super.resolveClass(desc);
}
}
}
}
© 2015 - 2025 Weber Informatics LLC | Privacy Policy