/*
* Copyright (c) 2003, 2005, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.tools.javac.code;
import java.util.LinkedHashMap;
import java.util.Map;
import javax.lang.model.element.AnnotationMirror;
import javax.lang.model.element.AnnotationValue;
import javax.lang.model.element.AnnotationValueVisitor;
import javax.lang.model.element.ExecutableElement;
import javax.lang.model.type.DeclaredType;
import com.sun.tools.javac.code.Symbol.*;
import com.sun.tools.javac.util.*;
import static com.sun.tools.javac.code.TypeTags.*;
/** An annotation value.
*
* <p><b>This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.</b>
*/
public abstract class Attribute implements AnnotationValue {
/** The type of the annotation element. */
public Type type;
public Attribute(Type type) {
this.type = type;
}
public abstract void accept(Visitor v);
public Object getValue() {
throw new UnsupportedOperationException();
}
public <R, P> R accept(AnnotationValueVisitor<R, P> v, P p) {
throw new UnsupportedOperationException();
}
/** The value for an annotation element of primitive type or String. */
public static class Constant extends Attribute {
public final Object value;
public void accept(Visitor v) { v.visitConstant(this); }
public Constant(Type type, Object value) {
super(type);
this.value = value;
}
public String toString() {
return Constants.format(value, type);
}
public Object getValue() {
return Constants.decode(value, type);
}
public <R, P> R accept(AnnotationValueVisitor<R, P> v, P p) {
if (value instanceof String)
return v.visitString((String) value, p);
if (value instanceof Integer) {
int i = (Integer) value;
switch (type.tag) {
case BOOLEAN: return v.visitBoolean(i != 0, p);
case CHAR: return v.visitChar((char) i, p);
case BYTE: return v.visitByte((byte) i, p);
case SHORT: return v.visitShort((short) i, p);
case INT: return v.visitInt(i, p);
}
}
switch (type.tag) {
case LONG: return v.visitLong((Long) value, p);
case FLOAT: return v.visitFloat((Float) value, p);
case DOUBLE: return v.visitDouble((Double) value, p);
}
throw new AssertionError("Bad annotation element value: " + value);
}
}
/** The value for an annotation element of type java.lang.Class,
* represented as a ClassSymbol.
*/
public static class Class extends Attribute {
public final Type type;
public void accept(Visitor v) { v.visitClass(this); }
public Class(Types types, Type type) {
super(makeClassType(types, type));
this.type = type;
}
static Type makeClassType(Types types, Type type) {
Type arg = type.isPrimitive()
? types.boxedClass(type).type
: types.erasure(type);
return new Type.ClassType(types.syms.classType.getEnclosingType(),
List.of(arg),
types.syms.classType.tsym);
}
public String toString() {
return type + ".class";
}
public Type getValue() {
return type;
}
public <R, P> R accept(AnnotationValueVisitor<R, P> v, P p) {
return v.visitType(type, p);
}
}
/** A compound annotation element value, the type of which is an
* attribute interface.
*/
public static class Compound extends Attribute implements AnnotationMirror {
/** The attributes values, as pairs. Each pair contains a
* reference to the accessing method in the attribute interface
* and the value to be returned when that method is called to
* access this attribute.
*/
public final List<Pair<MethodSymbol,Attribute>> values;
public Compound(Type type,
List<Pair<MethodSymbol,Attribute>> values) {
super(type);
this.values = values;
}
public void accept(Visitor v) { v.visitCompound(this); }
/**
* Returns a string representation of this annotation.
* String is of one of the forms:
* @com.example.foo(name1=val1, name2=val2)
* @com.example.foo(val)
* @com.example.foo
* Omit parens for marker annotations, and omit "value=" when allowed.
*/
public String toString() {
StringBuilder buf = new StringBuilder();
buf.append("@");
buf.append(type);
int len = values.length();
if (len > 0) {
buf.append('(');
boolean first = true;
for (Pair<MethodSymbol, Attribute> value : values) {
if (!first) buf.append(", ");
first = false;
Name name = value.fst.name;
if (len > 1 || name != name.table.value) {
buf.append(name);
buf.append('=');
}
buf.append(value.snd);
}
buf.append(')');
}
return buf.toString();
}
public Attribute member(Name member) {
for (Pair<MethodSymbol,Attribute> pair : values)
if (pair.fst.name == member) return pair.snd;
return null;
}
public Attribute.Compound getValue() {
return this;
}
public <R, P> R accept(AnnotationValueVisitor<R, P> v, P p) {
return v.visitAnnotation(this, p);
}
public DeclaredType getAnnotationType() {
return (DeclaredType) type;
}
public Map<MethodSymbol, Attribute> getElementValues() {
Map<MethodSymbol, Attribute> valmap =
new LinkedHashMap<MethodSymbol, Attribute>();
for (Pair<MethodSymbol, Attribute> value : values)
valmap.put(value.fst, value.snd);
return valmap;
}
}
/** The value for an annotation element of an array type.
*/
public static class Array extends Attribute {
public final Attribute[] values;
public Array(Type type, Attribute[] values) {
super(type);
this.values = values;
}
public void accept(Visitor v) { v.visitArray(this); }
public String toString() {
StringBuilder buf = new StringBuilder();
buf.append('{');
boolean first = true;
for (Attribute value : values) {
if (!first)
buf.append(", ");
first = false;
buf.append(value);
}
buf.append('}');
return buf.toString();
}
public List<Attribute> getValue() {
return List.from(values);
}
public <R, P> R accept(AnnotationValueVisitor<R, P> v, P p) {
return v.visitArray(getValue(), p);
}
}
/** The value for an annotation element of an enum type.
*/
public static class Enum extends Attribute {
public VarSymbol value;
public Enum(Type type, VarSymbol value) {
super(type);
assert value != null;
this.value = value;
}
public void accept(Visitor v) { v.visitEnum(this); }
public String toString() {
return value.enclClass() + "." + value; // qualified name
}
public VarSymbol getValue() {
return value;
}
public <R, P> R accept(AnnotationValueVisitor<R, P> v, P p) {
return v.visitEnumConstant(value, p);
}
}
public static class Error extends Attribute {
public Error(Type type) {
super(type);
}
public void accept(Visitor v) { v.visitError(this); }
public String toString() {
return "<error>";
}
public String getValue() {
return toString();
}
public <R, P> R accept(AnnotationValueVisitor<R, P> v, P p) {
return v.visitString(toString(), p);
}
}
/** A visitor type for dynamic dispatch on the kind of attribute value. */
public static interface Visitor {
void visitConstant(Attribute.Constant value);
void visitClass(Attribute.Class clazz);
void visitCompound(Attribute.Compound compound);
void visitArray(Attribute.Array array);
void visitEnum(Attribute.Enum e);
void visitError(Attribute.Error e);
}
}