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ByteCodeVisitor.java
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129 lines (113 loc) · 3.55 KB
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package act.util;
/*-
* #%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 act.asm.ClassVisitor;
import act.asm.ClassWriter;
import act.asm.Opcodes;
import org.osgl.$;
import org.osgl.util.E;
import java.util.Iterator;
import java.util.List;
/**
* Base class for all bytecode visitor, either detector or enhancer
*/
public class ByteCodeVisitor extends ClassVisitor implements Opcodes {
private $.Var<? extends ClassVisitor> _cv;
protected ByteCodeVisitor(ClassVisitor cv) {
super(ASM5, cv);
}
protected ByteCodeVisitor() {
super(ASM5);
}
public ByteCodeVisitor commitDownstream() {
if (null == _cv && null != cv && cv instanceof ByteCodeVisitor) {
((ByteCodeVisitor) cv).commitDownstream();
return this;
}
E.illegalStateIf(null == _cv || null != cv);
cv = _cv.get();
return this;
}
private ByteCodeVisitor setDownstream($.Var<? extends ClassVisitor> cv) {
E.illegalStateIf(null != this.cv);
_cv = cv;
return this;
}
public ByteCodeVisitor setDownstream(ClassVisitor cv) {
E.illegalStateIf(null != this.cv);
this.cv = cv;
return this;
}
public static ByteCodeVisitor chain($.Var<ClassWriter> cw, List<? extends ByteCodeVisitor> visitors) {
if (visitors.isEmpty()) {
return null;
}
Iterator<? extends ByteCodeVisitor> i = visitors.iterator();
ByteCodeVisitor v = i.next();
v.setDownstream(cw);
while (i.hasNext()) {
ByteCodeVisitor v0 = i.next();
v0.setDownstream(v);
v = v0;
}
return v;
}
public static ByteCodeVisitor chain(List<? extends ByteCodeVisitor> visitors) {
if (visitors.isEmpty()) {
return null;
}
Iterator<? extends ByteCodeVisitor> i = visitors.iterator();
ByteCodeVisitor v = i.next();
while (i.hasNext()) {
ByteCodeVisitor v0 = i.next();
v0.setDownstream(v);
v = v0;
}
return v;
}
public static ClassVisitor chain(ClassWriter cw, ByteCodeVisitor v0, ByteCodeVisitor... visitors) {
v0.setDownstream(cw);
int len = visitors.length;
if (0 == len) {
return v0;
}
for (int i = 0; i < len - 1; ++i) {
ByteCodeVisitor v = visitors[i];
v.setDownstream(v0);
v0 = v;
}
return v0;
}
public static boolean isConstructor(String methodName) {
return methodName.contains("<init>");
}
public static boolean isPublic(int access) {
return (ACC_PUBLIC & access) > 0;
}
public static boolean isPrivate(int access) {
return (ACC_PRIVATE & access) > 0;
}
public static boolean isStatic(int access) {
return (ACC_STATIC & access) > 0;
}
public static boolean isAbstract(int access) {
return (ACC_ABSTRACT & access) > 0;
}
}