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package com.google.inject.internal;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.base.Joiner.MapJoiner;
import com.google.common.base.Preconditions;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;
import com.google.inject.BindingAnnotation;
import com.google.inject.Key;
import com.google.inject.ScopeAnnotation;
import com.google.inject.TypeLiteral;
import com.google.inject.internal.util.Classes;
import com.google.inject.name.Named;
import com.google.inject.name.Names;
import javax.inject.Qualifier;
import java.lang.annotation.Annotation;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Member;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Arrays;
import java.util.Collection;
import java.util.Map;
/**
* Annotation utilities.
*
*/
public class Annotations {
private static final MapJoiner JOINER = Joiner.on(", ").withKeyValueSeparator("=");
private static final Function DEEP_TO_STRING_FN = new Function() {
@Override
public String apply(Object arg) {
String s = Arrays.deepToString(new Object[]{arg});
return s.substring(1, s.length() - 1); // cut off brackets
}
};
private static final LoadingCache, Annotation> cache =
CacheBuilder.newBuilder()
.weakKeys()
.build(new CacheLoader<>() {
@Override
public Annotation load(Class input) {
return generateAnnotationImpl(input);
}
});
private static final AnnotationChecker scopeChecker = new AnnotationChecker(
Arrays.asList(ScopeAnnotation.class, javax.inject.Scope.class));
private static final AnnotationChecker bindingAnnotationChecker = new AnnotationChecker(
Arrays.asList(BindingAnnotation.class, Qualifier.class));
/**
* Returns {@code true} if the given annotation type has no attributes.
*/
public static boolean isMarker(Class annotationType) {
return annotationType.getDeclaredMethods().length == 0;
}
public static boolean isAllDefaultMethods(Class annotationType) {
boolean hasMethods = false;
for (Method m : annotationType.getDeclaredMethods()) {
hasMethods = true;
if (m.getDefaultValue() == null) {
return false;
}
}
return hasMethods;
}
/**
* Generates an Annotation for the annotation class. Requires that the annotation is all
* optionals.
*/
@SuppressWarnings("unchecked")
public static T generateAnnotation(Class annotationType) {
Preconditions.checkState(
isAllDefaultMethods(annotationType), "%s is not all default methods", annotationType);
return (T) cache.getUnchecked(annotationType);
}
private static T generateAnnotationImpl(final Class annotationType) {
final Map members = resolveMembers(annotationType);
return annotationType.cast(Proxy.newProxyInstance(
annotationType.getClassLoader(),
new Class[]{annotationType},
(proxy, method, args) -> {
String name = method.getName();
switch (name) {
case "annotationType":
return annotationType;
case "toString":
return annotationToString(annotationType, members);
case "hashCode":
return annotationHashCode(annotationType, members);
case "equals":
return annotationEquals(annotationType, members, args[0]);
default:
return members.get(name);
}
}));
}
private static ImmutableMap resolveMembers(
Class annotationType) {
ImmutableMap.Builder result = ImmutableMap.builder();
for (Method method : annotationType.getDeclaredMethods()) {
result.put(method.getName(), method.getDefaultValue());
}
return result.build();
}
/**
* Implements {@link Annotation#equals}.
*/
private static boolean annotationEquals(Class type,
Map members, Object other) throws Exception {
if (!type.isInstance(other)) {
return false;
}
for (Method method : type.getDeclaredMethods()) {
String name = method.getName();
if (!Arrays.deepEquals(
new Object[]{method.invoke(other)}, new Object[]{members.get(name)})) {
return false;
}
}
return true;
}
/**
* Implements {@link Annotation#hashCode}.
*/
private static int annotationHashCode(Class type,
Map members) throws Exception {
int result = 0;
for (Method method : type.getDeclaredMethods()) {
String name = method.getName();
Object value = members.get(name);
result += (127 * name.hashCode()) ^ (Arrays.deepHashCode(new Object[]{value}) - 31);
}
return result;
}
/**
* Implements {@link Annotation#toString}.
*/
private static String annotationToString(Class type,
Map members) throws Exception {
StringBuilder sb = new StringBuilder().append("@").append(type.getName()).append("(");
JOINER.appendTo(sb, Maps.transformValues(members, DEEP_TO_STRING_FN));
return sb.append(")").toString();
}
/**
* Returns true if the given annotation is retained at runtime.
*/
public static boolean isRetainedAtRuntime(Class annotationType) {
Retention retention = annotationType.getAnnotation(Retention.class);
return retention != null && retention.value() == RetentionPolicy.RUNTIME;
}
/**
* Returns the scope annotation on {@code type}, or null if none is specified.
*/
public static Class findScopeAnnotation(
Errors errors, Class implementation) {
return findScopeAnnotation(errors, implementation.getAnnotations());
}
/**
* Returns the scoping annotation, or null if there isn't one.
*/
public static Class findScopeAnnotation(Errors errors, Annotation[] annotations) {
Class found = null;
for (Annotation annotation : annotations) {
Class annotationType = annotation.annotationType();
if (isScopeAnnotation(annotationType)) {
if (found != null) {
errors.duplicateScopeAnnotations(found, annotationType);
} else {
found = annotationType;
}
}
}
return found;
}
static boolean containsComponentAnnotation(Annotation[] annotations) {
for (Annotation annotation : annotations) {
// TODO(user): Should we scope this down to dagger.Component?
if (annotation.annotationType().getSimpleName().equals("Component")) {
return true;
}
}
return false;
}
private static final boolean QUOTE_MEMBER_VALUES = determineWhetherToQuote();
public static String memberValueString(String value) {
return QUOTE_MEMBER_VALUES ? "\"" + value + "\"" : value;
}
@Retention(RUNTIME)
private @interface TestAnnotation {
String value();
}
@TestAnnotation("determineWhetherToQuote")
private static boolean determineWhetherToQuote() {
try {
String annotation = Annotations.class
.getDeclaredMethod("determineWhetherToQuote")
.getAnnotation(TestAnnotation.class)
.toString();
return annotation.contains("\"determineWhetherToQuote\"");
} catch (NoSuchMethodException e) {
throw new AssertionError(e);
}
}
public static boolean isScopeAnnotation(Class annotationType) {
return scopeChecker.hasAnnotations(annotationType);
}
/**
* Adds an error if there is a misplaced annotations on {@code type}. Scoping
* annotations are not allowed on abstract classes or interfaces.
*/
public static void checkForMisplacedScopeAnnotations(
Class type, Object source, Errors errors) {
if (Classes.isConcrete(type)) {
return;
}
Class scopeAnnotation = findScopeAnnotation(errors, type);
if (scopeAnnotation != null
// We let Dagger Components through to aid migrations.
&& !containsComponentAnnotation(type.getAnnotations())) {
errors.withSource(type).scopeAnnotationOnAbstractType(scopeAnnotation, type, source);
}
}
/**
* Gets a key for the given type, member and annotations.
*/
public static Key getKey(TypeLiteral type, Member member, Annotation[] annotations,
Errors errors) throws ErrorsException {
int numErrorsBefore = errors.size();
Annotation found = findBindingAnnotation(errors, member, annotations);
errors.throwIfNewErrors(numErrorsBefore);
return found == null ? Key.get(type) : Key.get(type, found);
}
/**
* Returns the binding annotation on {@code member}, or null if there isn't one.
*/
public static Annotation findBindingAnnotation(Errors errors, Member member, Annotation[] annotations) {
Annotation found = null;
for (Annotation annotation : annotations) {
Class annotationType = annotation.annotationType();
if (isBindingAnnotation(annotationType)) {
if (found != null) {
errors.duplicateBindingAnnotations(member, found.annotationType(), annotationType);
} else {
found = annotation;
}
}
}
return found;
}
/**
* Returns true if annotations of the specified type are binding annotations.
*/
public static boolean isBindingAnnotation(Class annotationType) {
return bindingAnnotationChecker.hasAnnotations(annotationType);
}
/**
* If the annotation is an instance of {@code javax.inject.Named}, canonicalizes to
* com.google.guice.name.Named. Returns the given annotation otherwise.
*/
public static Annotation canonicalizeIfNamed(Annotation annotation) {
if (annotation instanceof javax.inject.Named) {
return Names.named(((javax.inject.Named) annotation).value());
} else {
return annotation;
}
}
/**
* If the annotation is the class {@code javax.inject.Named}, canonicalizes to
* com.google.guice.name.Named. Returns the given annotation class otherwise.
*/
public static Class canonicalizeIfNamed(
Class annotationType) {
if (annotationType == javax.inject.Named.class) {
return Named.class;
} else {
return annotationType;
}
}
/**
* Returns the name the binding should use. This is based on the annotation. If the annotation has
* an instance and is not a marker annotation, we ask the annotation for its toString. If it was a
* marker annotation or just an annotation type, we use the annotation's name. Otherwise, the name
* is the empty string.
*/
public static String nameOf(Key key) {
Annotation annotation = key.getAnnotation();
Class annotationType = key.getAnnotationType();
if (annotation != null && !isMarker(annotationType)) {
return key.getAnnotation().toString();
} else if (key.getAnnotationType() != null) {
return "@" + key.getAnnotationType().getName();
} else {
return "";
}
}
/**
* Checks for the presence of annotations. Caches results because Android doesn't.
*/
static class AnnotationChecker {
private final Collection> annotationTypes;
/**
* Returns true if the given class has one of the desired annotations.
*/
private CacheLoader, Boolean> hasAnnotations =
new CacheLoader<>() {
@Override
public Boolean load(Class annotationType) {
for (Annotation annotation : annotationType.getAnnotations()) {
if (annotationTypes.contains(annotation.annotationType())) {
return true;
}
}
return false;
}
};
final LoadingCache, Boolean> cache =
CacheBuilder.newBuilder().weakKeys().build(hasAnnotations);
/**
* Constructs a new checker that looks for annotations of the given types.
*/
AnnotationChecker(Collection> annotationTypes) {
this.annotationTypes = annotationTypes;
}
/**
* Returns true if the given type has one of the desired annotations.
*/
boolean hasAnnotations(Class annotated) {
return cache.getUnchecked(annotated);
}
}
}
