net.sf.cglib.proxy.LazyLoaderGenerator Maven / Gradle / Ivy
/*
* Copyright 2003,2004 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 net.sf.cglib.proxy;
import java.util.*;
import net.sf.cglib.core.*;
import org.objectweb.asm.Label;
import org.objectweb.asm.Type;
class LazyLoaderGenerator implements CallbackGenerator {
public static final LazyLoaderGenerator INSTANCE = new LazyLoaderGenerator();
private static final Signature LOAD_OBJECT =
TypeUtils.parseSignature("Object loadObject()");
private static final Type LAZY_LOADER =
TypeUtils.parseType("net.sf.cglib.proxy.LazyLoader");
public void generate(ClassEmitter ce, Context context, List methods) {
Set indexes = new HashSet();
for (Iterator it = methods.iterator(); it.hasNext();) {
MethodInfo method = (MethodInfo)it.next();
if (TypeUtils.isProtected(method.getModifiers())) {
// ignore protected methods
} else {
int index = context.getIndex(method);
indexes.add(new Integer(index));
CodeEmitter e = context.beginMethod(ce, method);
e.load_this();
e.dup();
e.invoke_virtual_this(loadMethod(index));
e.checkcast(method.getClassInfo().getType());
e.load_args();
e.invoke(method);
e.return_value();
e.end_method();
}
}
for (Iterator it = indexes.iterator(); it.hasNext();) {
int index = ((Integer)it.next()).intValue();
String delegate = "CGLIB$LAZY_LOADER_" + index;
ce.declare_field(Constants.ACC_PRIVATE, delegate, Constants.TYPE_OBJECT, null);
CodeEmitter e = ce.begin_method(Constants.ACC_PRIVATE |
Constants.ACC_SYNCHRONIZED |
Constants.ACC_FINAL,
loadMethod(index),
null);
e.load_this();
e.getfield(delegate);
e.dup();
Label end = e.make_label();
e.ifnonnull(end);
e.pop();
e.load_this();
context.emitCallback(e, index);
e.invoke_interface(LAZY_LOADER, LOAD_OBJECT);
e.dup_x1();
e.putfield(delegate);
e.mark(end);
e.return_value();
e.end_method();
}
}
private Signature loadMethod(int index) {
return new Signature("CGLIB$LOAD_PRIVATE_" + index,
Constants.TYPE_OBJECT,
Constants.TYPES_EMPTY);
}
public void generateStatic(CodeEmitter e, Context context, List methods) { }
}