com.strobel.assembler.metadata.annotations.AnnotationReader Maven / Gradle / Ivy
/*
* AnnotationReader.java
*
* Copyright (c) 2013 Mike Strobel
*
* This source code is based on Mono.Cecil from Jb Evain, Copyright (c) Jb Evain;
* and ILSpy/ICSharpCode from SharpDevelop, Copyright (c) AlphaSierraPapa.
*
* This source code is subject to terms and conditions of the Apache License, Version 2.0.
* A copy of the license can be found in the License.html file at the root of this distribution.
* By using this source code in any fashion, you are agreeing to be bound by the terms of the
* Apache License, Version 2.0.
*
* You must not remove this notice, or any other, from this software.
*/
package com.strobel.assembler.metadata.annotations;
import com.strobel.assembler.metadata.Buffer;
import com.strobel.assembler.metadata.IMetadataScope;
import com.strobel.assembler.metadata.TypeReference;
import com.strobel.core.ArrayUtilities;
import com.strobel.util.ContractUtils;
/**
* @author Mike Strobel
*/
public final class AnnotationReader {
public static CustomAnnotation read(final IMetadataScope scope, final Buffer input) {
final int typeToken = input.readUnsignedShort();
final int parameterCount = input.readUnsignedShort();
final TypeReference annotationType = scope.lookupType(typeToken);
final AnnotationParameter[] parameters = new AnnotationParameter[parameterCount];
readParameters(parameters, scope, input, true);
return new CustomAnnotation(annotationType, ArrayUtilities.asUnmodifiableList(parameters));
}
private static void readParameters(
final AnnotationParameter[] parameters,
final IMetadataScope scope,
final Buffer input,
final boolean namedParameter) {
for (int i = 0; i < parameters.length; i++) {
parameters[i] = new AnnotationParameter(
namedParameter ? scope.lookupConstant(input.readUnsignedShort())
: "value",
readElement(scope, input)
);
}
}
private static AnnotationElement readElement(final IMetadataScope scope, final Buffer input) {
final char tag = (char) input.readUnsignedByte();
final AnnotationElementType elementType = AnnotationElementType.forTag(tag);
switch (elementType) {
case Constant: {
Object constantValue = scope.lookupConstant(input.readUnsignedShort());
switch (tag) {
case 'B':
constantValue = ((Number)constantValue).byteValue();
break;
case 'C':
constantValue = (char)((Number)constantValue).intValue();
break;
case 'S':
constantValue = ((Number)constantValue).shortValue();
break;
case 'Z':
constantValue = ((Number)constantValue).intValue() == 0 ? Boolean.FALSE : Boolean.TRUE;
break;
}
return new ConstantAnnotationElement(constantValue);
}
case Enum: {
final TypeReference enumType = scope.lookupType(input.readUnsignedShort());
final String constantName = scope.lookupConstant(input.readUnsignedShort());
return new EnumAnnotationElement(enumType, constantName);
}
case Array: {
final AnnotationElement[] elements = new AnnotationElement[input.readUnsignedShort()];
for (int i = 0; i < elements.length; i++) {
elements[i] = readElement(scope, input);
}
return new ArrayAnnotationElement(elements);
}
case Class: {
final TypeReference type = scope.lookupType(input.readUnsignedShort());
return new ClassAnnotationElement(type);
}
case Annotation: {
final CustomAnnotation annotation = read(scope, input);
return new AnnotationAnnotationElement(annotation);
}
}
throw ContractUtils.unreachable();
}
}