org.ibatis.cglib.BulkBeanX Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of jbatis Show documentation
Show all versions of jbatis Show documentation
The jBATIS persistence framework will help you to significantly reduce the amount of Java code that you normally need to access a relational database. iBATIS simply maps JavaBeans to SQL statements using a very simple XML descriptor.
The newest version!
/*
* Copyright 2003 The Apache Software Foundation
*
* 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 org.ibatis.cglib;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import org.ibatis.asm.ClassWriter;
import org.ibatis.asm.Label;
import org.ibatis.asm.MethodEmitter;
import org.ibatis.asm.Opcodes;
import org.ibatis.asm.Type;
/**
* @author Song Sun
*/
public abstract class BulkBeanX implements Opcodes {
final int size;
protected BulkBeanX(int size) {
this.size = size;
}
public abstract void getPropertyValues(Object bean, Object[] values);
public abstract void setPropertyValues(Object bean, Object[] values);
public Object[] getPropertyValues(Object bean) {
Object[] values = new Object[size];
getPropertyValues(bean, values);
return values;
}
public static BulkBeanX create(final Class target, Object key, String[] propertyNames, Method[] getters, Method[] setters,
Field[] fields) throws Exception {
// CLoader cl = new CLoader(target);
Type beanType = Type.getType(target);
// String cn = "package." + target.getName() + "BulkBean" + seqNo++;
String cn = NamingPolicy.SIMPLE.getClassName(target.getName(), "BulkBean", key, new Predicate() {
public boolean evaluate(Object arg) {
try {
target.getClassLoader().loadClass((String) arg);
} catch (Exception e) {
return false;
}
return true;
}
});
Type goal = Type.getObjectType(cn.replace('.', '/'));
Type BULK_BEAN = Type.getType(BulkBeanX.class);
ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
cw.visit(V1_5, ACC_PUBLIC | ACC_SUPER | ACC_SYNTHETIC, goal.getInternalName(), null,
BULK_BEAN.getInternalName(), null);
cw.visitSource("", null);
{
MethodEmitter e = cw.visitMethodX(false, ACC_PUBLIC, "", "()V", null, null);
e.start_method();
Label start = e.mark();
e.load_local(goal, 0);
e.push(propertyNames.length);
e.invoke_constructor(BULK_BEAN, "(I)V");
e.return_void();
Label end = e.mark();
e.mark_local("this", goal, start, end, 0);
e.end_method();
}
{
MethodEmitter e = cw.visitMethodX(false, ACC_PUBLIC, "getPropertyValues",
"(Ljava/lang/Object;[Ljava/lang/Object;)V", null, null);
e.start_method();
Label start = e.mark();
e.load_local(T_Object, 1);
e.checkcast(beanType);
e.store_local(beanType, 3);
Label bean = e.mark();
Type oarray = T_Object.getArrayType(1);
for (int i = 0; i < propertyNames.length; i++) {
if (fields[i] != null) {
Field f = fields[i];
Type owner = Type.getType(f.getDeclaringClass());
Type type = Type.getType(f.getType());
e.load_local(oarray, 2);
e.push(i);
if ((f.getModifiers() & ACC_STATIC) == 0) {
e.load_local(beanType, 3);
e.getfield(owner, f.getName(), type);
} else {
e.getstatic(owner, f.getName(), type);
}
e.box(type);
e.aastore();
} else {
Method m = getters[i];
e.load_local(oarray, 2);
e.push(i);
if ((m.getModifiers() & ACC_STATIC) == 0) {
e.load_local(beanType, 3);
}
e.invoke_method(m);
e.box(Type.getType(m.getReturnType()));
e.aastore();
}
}
e.return_value(T_void);
Label end = e.mark();
e.mark_local("this", goal, start, end, 0);
e.mark_local("obj", T_Object, start, end, 1);
e.mark_local("values", oarray, start, end, 2);
e.mark_local("bean", beanType, bean, end, 3);
e.end_method();
}
{
MethodEmitter e = cw.visitMethodX(false, ACC_PUBLIC, "setPropertyValues",
"(Ljava/lang/Object;[Ljava/lang/Object;)V", null, null);
e.start_method();
Label start = e.mark();
e.load_local(T_Object, 1);
e.checkcast(beanType);
e.store_local(beanType, 3);
Type oarray = T_Object.getArrayType(1);
for (int i = 0; i < propertyNames.length; i++) {
if (fields[i] != null) {
Field f = fields[i];
Type owner = Type.getType(f.getDeclaringClass());
Type type = Type.getType(f.getType());
if ((f.getModifiers() & ACC_STATIC) == 0) {
e.load_local(beanType, 3);
}
e.load_local(oarray, 2);
e.aaload(i);
if (type.isPrimitive()) {
e.checkcast(type.toReferenceType());
// ## unbox the null value
e.unbox_or_zero(type);
} else {
e.checkcast(type);
}
if ((f.getModifiers() & ACC_STATIC) == 0) {
e.putfield(owner, f.getName(), type);
} else {
e.putstatic(owner, f.getName(), type);
}
} else {
Method m = setters[i];
Type atype = Type.getType(m.getParameterTypes()[0]);
if ((m.getModifiers() & ACC_STATIC) == 0) {
e.load_local(beanType, 3);
}
e.load_local(oarray, 2);
e.aaload(i);
if (atype.isPrimitive()) {
e.checkcast(atype.toReferenceType());
// ## unbox the null value
e.unbox_or_zero(atype);
} else {
e.checkcast(atype);
}
e.invoke_method(m);
}
}
e.return_value(T_void);
Label end = e.mark();
e.mark_local("this", goal, start, end, 0);
e.mark_local("obj", T_Object, start, end, 1);
e.mark_local("values", oarray, start, end, 2);
e.mark_local("bean", beanType, start, end, 2);
e.end_method();
}
cw.visitEnd();
byte[] bs = cw.toByteArray();
/*-
OutputStream os = null;
try {
File file = new File("f:/" + cn + ".class");
file.getParentFile().mkdirs();
os = new BufferedOutputStream(new FileOutputStream(file));
os.write(bs);
} catch (Exception e) {
} finally {
if (os != null) {
try {
os.close();
} catch (IOException e) {
}
}
}
//*/
// Class clazz = cl.newClass(bs, 0, bs.length);
Class clazz = ReflectUtil.defineClass(cn, bs, target.getClassLoader());
/*-
synchronized (beans) {
BulkBeanX bx = (BulkBeanX) beans.get(clazz);
if (bx != null) {
return bx;
}
}
*/
return (BulkBeanX) clazz.getConstructor().newInstance();
}
}