com.alipay.sofa.common.profile.enumeration.Enum 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 com.alipay.sofa.common.profile.enumeration;
import com.alipay.sofa.common.utils.ClassLoaderUtil;
import com.alipay.sofa.common.utils.StringUtil;
import com.alipay.sofa.common.profile.enumeration.internal.NumberType;
import java.io.InvalidClassException;
import java.io.ObjectStreamException;
import java.io.Serializable;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
/**
*
* @author luoguimu123
* @version $Id: Enum.java, v 0.1 2017年08月01日 上午11:46 luoguimu123 Exp $
*/
public abstract class Enum extends Number implements NumberType, Comparable, Serializable {
private static final long serialVersionUID = -3420208858441821772L;
private String name;
private Number value;
protected Enum() {
}
protected static final Enum create() {
return createEnum((String) null, (Number) null, false);
}
protected static final Enum create(String name) {
return createEnum(name, (Number) null, false);
}
static final Enum createEnum(Number value) {
return createEnum((String) null, value, true);
}
static final Enum createEnum(String name, Number value) {
return createEnum(name, value, true);
}
private static Enum createEnum(String name, Number value, boolean withValue) {
String enumClassName = null;
Class enumClass;
Enum enumObject;
try {
enumClassName = getCallerClassName();
enumClass = ClassLoaderUtil.loadClass(enumClassName);
enumObject = (Enum) enumClass.newInstance();
enumObject.setName(StringUtil.trimToNull(name));
} catch (ClassNotFoundException var8) {
throw new RuntimeException("Could not find enum class " + enumClassName, var8);
} catch (Exception var9) {
throw new RuntimeException("Could not instantiate enum instance of class "
+ enumClassName, var9);
}
if (withValue && value == null) {
throw new NullPointerException("The Enum value must not be null");
} else {
Enum.EnumType enumType = EnumUtil.getEnumType(enumClass);
boolean flagMode = enumObject instanceof Flags;
if (withValue) {
enumObject.value = enumType.setValue(value, flagMode);
} else {
enumObject.value = enumType.getNextValue(flagMode);
}
enumType.enumList.add(enumObject);
if (!enumType.valueMap.containsKey(enumObject.value)) {
enumType.valueMap.put(enumObject.value, enumObject);
}
if (enumObject.name != null && !enumType.nameMap.containsKey(enumObject.name)) {
enumType.nameMap.put(enumObject.name, enumObject);
}
return enumObject;
}
}
private static String getCallerClassName() {
StackTraceElement[] callers = (new Throwable()).getStackTrace();
String enumClass = Enum.class.getName();
for (int i = 0; i < callers.length; ++i) {
StackTraceElement caller = callers[i];
String className = caller.getClassName();
String methodName = caller.getMethodName();
if (!enumClass.equals(className) && "".equals(methodName)) {
return className;
}
}
throw new RuntimeException("Cannot get Enum-class name");
}
public String getName() {
if (this.name == null) {
Class enumClass = this.ensureClassLoaded();
Enum.EnumType enumType = EnumUtil.getEnumType(enumClass);
enumType.populateNames(enumClass);
}
return this.name;
}
private Enum setName(String name) {
if (this.name != null) {
throw new IllegalStateException("Enum name already set: " + this.name);
} else {
this.name = name;
return this;
}
}
public Number getValue() {
return this.value;
}
public byte byteValue() {
return (byte) this.intValue();
}
public short shortValue() {
return (short) this.intValue();
}
public int compareTo(Object otherEnum) {
if (!this.getClass().equals(otherEnum.getClass())) {
throw new RuntimeException(MessageFormat.format(
"Could not compare object of \"{0}\" with object of \"{1}\"", new Object[] {
this.getClass().getName(), otherEnum.getClass().getName() }));
} else {
return ((Comparable) this.value).compareTo(((Enum) otherEnum).value);
}
}
public boolean equals(Object obj) {
return obj == this ? true
: (obj != null && this.getClass().equals(obj.getClass()) ? this.value
.equals(((Enum) obj).value) : false);
}
public int hashCode() {
return this.getClass().hashCode() ^ this.value.hashCode();
}
public String toString() {
return this.getName();
}
public Class ensureClassLoaded() {
Class enumClass = this.getClass();
synchronized (enumClass) {
return enumClass;
}
}
protected Object writeReplace() throws ObjectStreamException {
this.getName();
return this;
}
protected Object readResolve() throws ObjectStreamException {
Class enumClass = this.ensureClassLoaded();
Enum.EnumType enumType = EnumUtil.getEnumType(enumClass);
Enum enumObject = (Enum) enumType.nameMap.get(this.getName());
if (enumObject == null) {
enumType.populateNames(enumClass);
enumObject = (Enum) enumType.nameMap.get(this.getName());
}
if (enumObject == null) {
throw new InvalidClassException("Enum name \"" + this.getName()
+ "\" not found in class " + enumClass.getName());
} else if (!enumObject.value.equals(this.value)) {
throw new InvalidClassException("Enum value \"" + this.value
+ "\" does not match in class " + enumClass.getName());
} else {
return enumObject;
}
}
protected abstract static class EnumType {
private Number value;
final Map nameMap = Collections.synchronizedMap(new HashMap());
final Map valueMap = Collections.synchronizedMap(new HashMap());
final List enumList = new ArrayList();
protected EnumType() {
}
final Number setValue(Number value, boolean flagMode) {
this.value = value;
return value;
}
final Number getNextValue(boolean flagMode) {
this.value = this.getNextValue(this.value, flagMode);
if (flagMode && this.isZero(this.value)) {
throw new UnsupportedOperationException("The flag value is out of range");
} else {
return this.value;
}
}
final void populateNames(Class enumClass) {
Field[] fields = enumClass.getFields();
for (int i = 0; i < fields.length; ++i) {
Field field = fields[i];
int modifier = field.getModifiers();
if (Modifier.isPublic(modifier) && Modifier.isFinal(modifier)
&& Modifier.isStatic(modifier)) {
try {
Object value = field.get((Object) null);
Iterator j = this.valueMap.values().iterator();
while (j.hasNext()) {
Enum enumObject = (Enum) j.next();
if (value == enumObject && enumObject.name == null) {
enumObject.name = field.getName();
this.nameMap.put(enumObject.name, enumObject);
break;
}
}
} catch (IllegalAccessException var9) {
throw new RuntimeException(var9);
}
}
}
}
protected abstract Class getUnderlyingClass();
protected abstract Number getNextValue(Number var1, boolean var2);
protected abstract boolean isZero(Number var1);
}
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