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EnvMatcher.java
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122 lines (107 loc) · 3.61 KB
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package act.app.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.Act;
import act.asm.AnnotationVisitor;
import act.exception.EnvNotMatchException;
import act.sys.Env;
import act.util.ByteCodeVisitor;
import org.osgl.util.E;
/**
* Detect if a class has `Env` annotations and check if
* the class's `Env` annotation matches current running environment
*/
public class EnvMatcher extends ByteCodeVisitor {
public EnvMatcher() {
}
@Override
public AnnotationVisitor visitAnnotation(String desc, boolean visible) {
AnnotationVisitor av = super.visitAnnotation(desc, visible);
if (desc.startsWith("Lact/sys/Env$")) {
return new EnvAnnotationVisitor(av, desc);
}
return av;
}
private static class EnvAnnotationVisitor extends AnnotationVisitor {
enum Type {
Profile() {
@Override
boolean matches(EnvAnnotationVisitor visitor) {
return Env.profileMatches(visitor.value, visitor.except);
}
}, Group() {
@Override
boolean matches(EnvAnnotationVisitor visitor) {
return Env.groupMatches(visitor.value, visitor.except);
}
}, Mode() {
@Override
boolean matches(EnvAnnotationVisitor visitor) {
return Env.modeMatches(Act.Mode.valueOf(visitor.value), visitor.except);
}
};
abstract boolean matches(EnvAnnotationVisitor visitor);
}
private Type type;
private String value;
private boolean except;
public EnvAnnotationVisitor(AnnotationVisitor av, String desc) {
super(ASM5, av);
initType(desc);
}
@Override
public void visit(String name, Object value) {
if ("value".equals(name)) {
this.value = value.toString();
} else if ("except".equals(name)) {
this.except = Boolean.parseBoolean(value.toString());
}
super.visit(name, value);
}
@Override
public void visitEnum(String name, String desc, String value) {
if ("value".equals(name)) {
this.value = value;
}
super.visitEnum(name, desc, value);
}
private void initType(String desc) {
if (desc.contains("Profile")) {
type = Type.Profile;
} else if (desc.contains("Mode")) {
type = Type.Mode;
} else if (desc.contains("Group")) {
type = Type.Group;
} else {
throw E.unexpected("Unknown Env annotation: %s", desc);
}
}
@Override
public void visitEnd() {
if (!matches()) {
throw new EnvNotMatchException();
}
super.visitEnd();
}
private boolean matches() {
return type.matches(this);
}
}
}