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BeanUtils library is a Java bean copy utility with powerful functionality and high performance.
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/*
BeanUtils Version 1.0.0
Created by yangtu222 on 2017.08.05
Distributed under the permissive zlib License
Get the latest version from here:
https://github.com/yangtu222/BeanUtils
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
package com.tuyang.beanutils.internal.utils;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.util.Collection;
import java.util.Deque;
import java.util.Iterator;
import java.util.List;
import java.util.Queue;
import java.util.Set;
import com.tuyang.beanutils.BeanCopyUtils;
import com.tuyang.beanutils.annotation.CopyFeature;
import com.tuyang.beanutils.config.BeanCopyConfig;
import com.tuyang.beanutils.exception.BeanCopyException;
import com.tuyang.beanutils.internal.dump.BeanCopyDump;
public class InstanceUtils {
@SuppressWarnings("rawtypes")
public static Collection newCollection(Class clazz) {
BeanCopyConfig config = BeanCopyConfig.instance();
if ( !PropertyUtils.isInterfaceType(clazz, Collection.class) ) {
throw new BeanCopyException("Invalid collection type for " + clazz.getSimpleName() );
}
Class paramClazz = clazz;
while( clazz != null ) {
if( clazz.isInterface() ) {
if( clazz.equals(List.class) ) {
return (Collection) newInstance(config.getListClass());
}
if( clazz.equals(Set.class) ) {
return (Collection) newInstance(config.getSetClass() );
}
if( clazz.equals(Deque.class) ) {
return (Collection) newInstance(config.getDequeClass() );
}
if( clazz.equals(Queue.class) ) {
return (Collection) newInstance(config.getQueueClass() );
}
}
Class[] interfaces = clazz.getInterfaces();
for( Class interfaceClass : interfaces ) {
if( interfaceClass.equals(List.class) ) {
return (Collection) newInstance(config.getListClass());
}
if( interfaceClass.equals(Set.class) ) {
return (Collection) newInstance(config.getSetClass() );
}
if( clazz.equals(Deque.class) ) {
return (Collection) newInstance(config.getDequeClass() );
}
if( clazz.equals(Queue.class) ) {
return (Collection) newInstance(config.getQueueClass() );
}
}
clazz = clazz.getSuperclass();
}
throw new BeanCopyException("Cannot new instance for collection for " + paramClazz.getSimpleName() );
}
@SuppressWarnings({ "rawtypes", "unchecked" })
public static T newInstance( Class targetClass ) {
T targetObject = null;
try {
targetObject = targetClass.newInstance();
} catch (Exception e) {
}
if( targetObject == null ) {
try {
Constructor con = targetClass.getDeclaredConstructor();
con.setAccessible(true);
targetObject = (T) con.newInstance();
}catch (Exception e) {
throw new BeanCopyException( "beanCopy new instance", e);
}
}
return targetObject;
}
@SuppressWarnings({ "unchecked", "rawtypes" })
public static Collection unsafeCopyCollection(Object sourceObject, Class targetClass, Class optionClass,
Class collectionClass, CopyFeature[] features ) {
if( sourceObject == null )
return null;
boolean enumThrowsException = true;
boolean useObjectToStringCopy = false;
for( CopyFeature feature :features ) {
if(feature == CopyFeature.IGNORE_ENUM_CONVERT_EXCEPTION ) {
enumThrowsException = false;
}else if( feature == CopyFeature.ENABLE_JAVA_BEAN_TO_STRING ) {
useObjectToStringCopy = true;
}
}
if( sourceObject instanceof Collection ) {
Collection sourceList = (Collection) sourceObject;
Collection dataList = (Collection) InstanceUtils.newCollection(collectionClass);
if( targetClass.equals(String.class) && useObjectToStringCopy ) {
for( Object sourceObj : sourceList ) {
dataList.add((T) (sourceObj != null ? sourceObj.toString() : null) );
}
return dataList;
}
else if( targetClass.isEnum() ) {
for( Object sourceObj : sourceList ) {
dataList.add( getEnumValue(sourceObj, targetClass, enumThrowsException) );
}
return dataList;
}
return (Collection) BeanCopyUtils.copyCollection((Collection)sourceObject, targetClass, optionClass);
} else if( sourceObject.getClass().isArray() ) {
BeanCopyDump.beginDump();
int count = Array.getLength(sourceObject);
Collection dataList = (Collection) InstanceUtils.newCollection(collectionClass);
if( targetClass.equals(String.class) && useObjectToStringCopy ) {
for( int i =0; i< count ; i++ ) {
Object newInst = Array.get(sourceObject, i);
dataList.add( (T)( newInst != null ? newInst.toString() : null) );
}
}
else if( targetClass.isEnum() ) {
for( int i =0; i< count ; i++ ) {
Object newInst = Array.get(sourceObject, i);
dataList.add( getEnumValue(newInst, targetClass, enumThrowsException) );
}
}
else if( PropertyUtils.isPrimitive( sourceObject.getClass().getComponentType() ) ) {
for( int i =0; i< count ; i++ ) {
T newInst = (T) Array.get(sourceObject, i);
dataList.add(newInst);
}
} else {
for( int i =0; i< count ; i++ ) {
T newInst = (T) BeanCopyUtils.copyBean( Array.get(sourceObject, i) , targetClass, optionClass);
dataList.add(newInst);
}
}
BeanCopyDump.endDump();
return dataList;
}
return null;
}
@SuppressWarnings({ "unchecked", "rawtypes" })
private static T getEnumValue(Object sourceObj, Class targetClass, boolean enumThrowsException) {
if( sourceObj == null )
return null;
if( enumThrowsException ) {
Class target = targetClass;
return (T) Enum.valueOf(target, sourceObj.toString());
}
Enum[] enums = (Enum[])targetClass.getEnumConstants();
for( Enum enumKey : enums ) {
if( enumKey.name().equals(sourceObj.toString())) {
return (T) enumKey;
}
}
return null;
}
public static Object unsafeCopyArray(Object sourceObject, Class targetClassType, Class optionClass, CopyFeature[] features ) {
if( sourceObject == null )
return null;
boolean enumThrowsException = true;
boolean useObjectToStringCopy = false;
for( CopyFeature feature :features ) {
if(feature == CopyFeature.IGNORE_ENUM_CONVERT_EXCEPTION ) {
enumThrowsException = false;
}else if( feature == CopyFeature.ENABLE_JAVA_BEAN_TO_STRING ) {
useObjectToStringCopy = true;
}
}
if( sourceObject instanceof Collection ) {
BeanCopyDump.beginDump();
Collection collection = (Collection) sourceObject;
Object retObject = Array.newInstance(targetClassType, collection.size());
Iterator it = collection.iterator();
int i =0;
if( targetClassType.equals(String.class) && useObjectToStringCopy ) {
while( it.hasNext() ) {
Array.set(retObject, i++, it.next().toString() );
}
}
else if( targetClassType.isEnum() ) {
for( Object sourceObj : collection ) {
Array.set(retObject, i++, getEnumValue(sourceObj, targetClassType, enumThrowsException) );
}
}
else if( PropertyUtils.isPrimitive(targetClassType)) {
while( it.hasNext() ) {
Array.set(retObject, i++, it.next() );
}
}
else {
while( it.hasNext() ) {
Object newInst = BeanCopyUtils.copyBean(it.next(), targetClassType, optionClass);
Array.set(retObject, i++, newInst);
}
}
BeanCopyDump.endDump();
return retObject;
} else if( sourceObject.getClass().isArray() ) {
BeanCopyDump.beginDump();
int count = Array.getLength(sourceObject);
Object retObject = Array.newInstance(targetClassType, count );
if( targetClassType.equals(String.class) && useObjectToStringCopy ) {
for( int i =0; i< count; i++ ) {
Array.set(retObject, i, Array.get(sourceObject, i) != null ? Array.get(sourceObject, i).toString() : null );
}
}
else if( targetClassType.isEnum() ) {
for( int i =0; i< count ; i++ ) {
Object newInst = getEnumValue(Array.get(sourceObject, i), targetClassType, enumThrowsException);
Array.set(retObject, i, newInst);
}
}
else {
for( int i =0; i< count ; i++ ) {
Object newInst = BeanCopyUtils.copyBean( Array.get(sourceObject, i), targetClassType, optionClass);
Array.set(retObject, i, newInst);
}
}
BeanCopyDump.endDump();
return retObject;
}
return null;
}
}