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/*
* Javassist, a Java-bytecode translator toolkit.
* Copyright (C) 2004 Bill Burke. All Rights Reserved.
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. Alternatively, the contents of this file may be used under
* the terms of the GNU Lesser General Public License Version 2.1 or later,
* or the Apache License Version 2.0.
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*/
package javassist.bytecode.annotation;
import java.io.IOException;
import java.lang.reflect.Method;
import javassist.ClassPool;
import javassist.bytecode.ConstPool;
import javassist.bytecode.Descriptor;
/**
* Enum constant value.
*
* @author <a href="mailto:bill@jboss.org">Bill Burke</a>
* @author Shigeru Chiba
*/
public class EnumMemberValue extends MemberValue {
int typeIndex, valueIndex;
/**
* Constructs an enum constant value. The initial value is specified
* by the constant pool entries at the given indexes.
*
* @param type the index of a CONSTANT_Utf8_info structure
* representing the enum type.
* @param value the index of a CONSTANT_Utf8_info structure.
* representing the enum value.
*/
public EnumMemberValue(int type, int value, ConstPool cp) {
super('e', cp);
this.typeIndex = type;
this.valueIndex = value;
}
/**
* Constructs an enum constant value.
* The initial value is not specified.
*/
public EnumMemberValue(ConstPool cp) {
super('e', cp);
typeIndex = valueIndex = 0;
}
@Override
Object getValue(ClassLoader cl, ClassPool cp, Method m)
throws ClassNotFoundException
{
try {
return getType(cl).getField(getValue()).get(null);
}
catch (NoSuchFieldException e) {
throw new ClassNotFoundException(getType() + "." + getValue());
}
catch (IllegalAccessException e) {
throw new ClassNotFoundException(getType() + "." + getValue());
}
}
@Override
Class<?> getType(ClassLoader cl) throws ClassNotFoundException {
return loadClass(cl, getType());
}
/**
* Obtains the enum type name.
*
* @return a fully-qualified type name.
*/
public String getType() {
return Descriptor.toClassName(cp.getUtf8Info(typeIndex));
}
/**
* Changes the enum type name.
*
* @param typename a fully-qualified type name.
*/
public void setType(String typename) {
typeIndex = cp.addUtf8Info(Descriptor.of(typename));
}
/**
* Obtains the name of the enum constant value.
*/
public String getValue() {
return cp.getUtf8Info(valueIndex);
}
/**
* Changes the name of the enum constant value.
*/
public void setValue(String name) {
valueIndex = cp.addUtf8Info(name);
}
@Override
public String toString() {
return getType() + "." + getValue();
}
/**
* Writes the value.
*/
@Override
public void write(AnnotationsWriter writer) throws IOException {
writer.enumConstValue(cp.getUtf8Info(typeIndex), getValue());
}
/**
* Accepts a visitor.
*/
@Override
public void accept(MemberValueVisitor visitor) {
visitor.visitEnumMemberValue(this);
}
}
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