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package act.controller.bytecode;
/*-
* #%L
* ACT Framework
* %%
* Copyright (C) 2014 - 2017 ActFramework
* %%
* 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.
* #L%
*/
import static act.asm.tree.AbstractInsnNode.*;
import act.app.ActionContext;
import act.asm.*;
import act.asm.tree.*;
import act.controller.meta.*;
import act.util.AsmTypes;
import org.osgl.logging.LogManager;
import org.osgl.logging.Logger;
import org.osgl.mvc.result.Result;
import org.osgl.util.*;
import java.util.*;
public class HandlerEnhancer extends MethodVisitor implements Opcodes {
private static final Logger logger = LogManager.get(HandlerEnhancer.class);
private static final String RESULT_CLASS = Result.class.getName();
private HandlerMethodMetaInfo info;
private MethodVisitor next;
private int paramIdShift = 0;
private Set skipNaming = new HashSet<>();
private Map overriddenNames = new HashMap<>();
private boolean notAction;
public HandlerEnhancer(final MethodVisitor mv, HandlerMethodMetaInfo meta, final int access, final String name, final String desc, final String signature, final String[] exceptions) {
super(ASM5, new MethodNode(access, name, desc, signature, exceptions));
if (logger.isTraceEnabled()) {
logger.trace("enhance handler: " + meta.fullName());
}
this.info = meta;
this.next = mv;
}
@Override
public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
if ("Lact/controller/NotAction;".equals(desc)) {
notAction = true;
}
return super.visitAnnotation(desc, visible);
}
@Override
public AnnotationVisitor visitParameterAnnotation(final int parameter, String desc, boolean visible) {
if ("Ljavax/inject/Named;".equals(desc)) {
skipNaming.add(parameter);
} else if ("Lorg/osgl/mvc/annotation/Param;".equals(desc)) {
return new AnnotationVisitor(ASM5, super.visitParameterAnnotation(parameter, desc, visible)) {
@Override
public void visit(String name, Object value) {
if ("value".equals(name)) {
overriddenNames.put(parameter, S.string(value));
}
super.visit(name, value);
}
};
}
return super.visitParameterAnnotation(parameter, desc, visible);
}
@Override
public void visitLocalVariable(String name, String desc, String signature, Label start, Label end, int index) {
if (!"this".equals(name)) {
int paramId = index;
if (!info.isStatic()) {
paramId--;
}
paramId -= paramIdShift;
if (paramId < info.paramCount()) {
HandlerParamMetaInfo param = info.param(paramId);
param.name(name);
if (Type.getType(long.class).equals(param.type()) || Type.getType(double.class).equals(param.type())) {
paramIdShift++;
}
}
LocalVariableMetaInfo local = new LocalVariableMetaInfo(index, name, desc, start, end);
info.addLocal(local);
}
super.visitLocalVariable(name, desc, signature, start, end, index);
}
@Override
public void visitLineNumber(int line, Label start) {
super.visitLineNumber(line, start);
AsmContext.line(line);
}
@Override
public void visitEnd() {
if (notAction) {
super.visitEnd();
return;
}
MethodNode mn = (MethodNode) mv;
addParamAnnotations();
transform(mn);
mn.accept(next);
}
private void addParamAnnotations() {
int sz = info.paramCount();
for (int i = 0; i < sz; ++i) {
if (!skipNaming.contains(i)) {
String name = overriddenNames.get(i);
if (null == name) name = info.param(i).name();
AnnotationVisitor av = mv.visitParameterAnnotation(i, "Ljavax/inject/Named;", true);
av.visit("value", name);
}
}
}
private void transform(MethodNode mn) {
new Transformer(mn, info).doIt();
}
private static class Transformer {
MethodNode mn;
InsnList instructions;
private HandlerMethodMetaInfo meta;
List
