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net.sf.cglib.beans.BeanMapEmitter 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.beans;
import java.beans.*;
import java.util.*;
import net.sf.cglib.core.*;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.Label;
import org.objectweb.asm.Type;
class BeanMapEmitter extends ClassEmitter {
private static final Type BEAN_MAP =
TypeUtils.parseType("net.sf.cglib.beans.BeanMap");
private static final Type FIXED_KEY_SET =
TypeUtils.parseType("net.sf.cglib.beans.FixedKeySet");
private static final Signature CSTRUCT_OBJECT =
TypeUtils.parseConstructor("Object");
private static final Signature CSTRUCT_STRING_ARRAY =
TypeUtils.parseConstructor("String[]");
private static final Signature BEAN_MAP_GET =
TypeUtils.parseSignature("Object get(Object, Object)");
private static final Signature BEAN_MAP_PUT =
TypeUtils.parseSignature("Object put(Object, Object, Object)");
private static final Signature KEY_SET =
TypeUtils.parseSignature("java.util.Set keySet()");
private static final Signature NEW_INSTANCE =
new Signature("newInstance", BEAN_MAP, new Type[]{ Constants.TYPE_OBJECT });
private static final Signature GET_PROPERTY_TYPE =
TypeUtils.parseSignature("Class getPropertyType(String)");
public BeanMapEmitter(ClassVisitor v, String className, Class type, int require) {
super(v);
begin_class(Constants.V1_2, Constants.ACC_PUBLIC, className, BEAN_MAP, null, Constants.SOURCE_FILE);
EmitUtils.null_constructor(this);
EmitUtils.factory_method(this, NEW_INSTANCE);
generateConstructor();
Map getters = makePropertyMap(ReflectUtils.getBeanGetters(type));
Map setters = makePropertyMap(ReflectUtils.getBeanSetters(type));
Map allProps = new HashMap();
allProps.putAll(getters);
allProps.putAll(setters);
if (require != 0) {
for (Iterator it = allProps.keySet().iterator(); it.hasNext();) {
String name = (String)it.next();
if ((((require & BeanMap.REQUIRE_GETTER) != 0) && !getters.containsKey(name)) ||
(((require & BeanMap.REQUIRE_SETTER) != 0) && !setters.containsKey(name))) {
it.remove();
getters.remove(name);
setters.remove(name);
}
}
}
generateGet(type, getters);
generatePut(type, setters);
String[] allNames = getNames(allProps);
generateKeySet(allNames);
generateGetPropertyType(allProps, allNames);
end_class();
}
private Map makePropertyMap(PropertyDescriptor[] props) {
Map names = new HashMap();
for (int i = 0; i < props.length; i++) {
names.put(((PropertyDescriptor)props[i]).getName(), props[i]);
}
return names;
}
private String[] getNames(Map propertyMap) {
return (String[])propertyMap.keySet().toArray(new String[propertyMap.size()]);
}
private void generateConstructor() {
CodeEmitter e = begin_method(Constants.ACC_PUBLIC, CSTRUCT_OBJECT, null);
e.load_this();
e.load_arg(0);
e.super_invoke_constructor(CSTRUCT_OBJECT);
e.return_value();
e.end_method();
}
private void generateGet(Class type, final Map getters) {
final CodeEmitter e = begin_method(Constants.ACC_PUBLIC, BEAN_MAP_GET, null);
e.load_arg(0);
e.checkcast(Type.getType(type));
e.load_arg(1);
e.checkcast(Constants.TYPE_STRING);
EmitUtils.string_switch(e, getNames(getters), Constants.SWITCH_STYLE_HASH, new ObjectSwitchCallback() {
public void processCase(Object key, Label end) {
PropertyDescriptor pd = (PropertyDescriptor)getters.get(key);
MethodInfo method = ReflectUtils.getMethodInfo(pd.getReadMethod());
e.invoke(method);
e.box(method.getSignature().getReturnType());
e.return_value();
}
public void processDefault() {
e.aconst_null();
e.return_value();
}
});
e.end_method();
}
private void generatePut(Class type, final Map setters) {
final CodeEmitter e = begin_method(Constants.ACC_PUBLIC, BEAN_MAP_PUT, null);
e.load_arg(0);
e.checkcast(Type.getType(type));
e.load_arg(1);
e.checkcast(Constants.TYPE_STRING);
EmitUtils.string_switch(e, getNames(setters), Constants.SWITCH_STYLE_HASH, new ObjectSwitchCallback() {
public void processCase(Object key, Label end) {
PropertyDescriptor pd = (PropertyDescriptor)setters.get(key);
if (pd.getReadMethod() == null) {
e.aconst_null();
} else {
MethodInfo read = ReflectUtils.getMethodInfo(pd.getReadMethod());
e.dup();
e.invoke(read);
e.box(read.getSignature().getReturnType());
}
e.swap(); // move old value behind bean
e.load_arg(2); // new value
MethodInfo write = ReflectUtils.getMethodInfo(pd.getWriteMethod());
e.unbox(write.getSignature().getArgumentTypes()[0]);
e.invoke(write);
e.return_value();
}
public void processDefault() {
// fall-through
}
});
e.aconst_null();
e.return_value();
e.end_method();
}
private void generateKeySet(String[] allNames) {
// static initializer
declare_field(Constants.ACC_STATIC | Constants.ACC_PRIVATE, "keys", FIXED_KEY_SET, null);
CodeEmitter e = begin_static();
e.new_instance(FIXED_KEY_SET);
e.dup();
EmitUtils.push_array(e, allNames);
e.invoke_constructor(FIXED_KEY_SET, CSTRUCT_STRING_ARRAY);
e.putfield("keys");
e.return_value();
e.end_method();
// keySet
e = begin_method(Constants.ACC_PUBLIC, KEY_SET, null);
e.load_this();
e.getfield("keys");
e.return_value();
e.end_method();
}
private void generateGetPropertyType(final Map allProps, String[] allNames) {
final CodeEmitter e = begin_method(Constants.ACC_PUBLIC, GET_PROPERTY_TYPE, null);
e.load_arg(0);
EmitUtils.string_switch(e, allNames, Constants.SWITCH_STYLE_HASH, new ObjectSwitchCallback() {
public void processCase(Object key, Label end) {
PropertyDescriptor pd = (PropertyDescriptor)allProps.get(key);
EmitUtils.load_class(e, Type.getType(pd.getPropertyType()));
e.return_value();
}
public void processDefault() {
e.aconst_null();
e.return_value();
}
});
e.end_method();
}
}
