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package com.google.inject.matcher;

import java.lang.annotation.Annotation;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Method;

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;

/**
 * Matcher implementations. Supports matching classes and methods.
 *
 */
public class Matchers {
    private static final Matcher ANY = new Any();

    private Matchers() {
    }

    /**
     * Returns a matcher which matches any input.
     */
    public static Matcher any() {
        return ANY;
    }

    /**
     * Inverts the given matcher.
     */
    public static  Matcher not(final Matcher p) {
        return new Not<>(p);
    }

    private static void checkForRuntimeRetention(
            Class annotationType) {
        Retention retention = annotationType.getAnnotation(Retention.class);
        checkArgument(retention != null && retention.value() == RetentionPolicy.RUNTIME,
                "Annotation %s is missing RUNTIME retention", annotationType.getSimpleName());
    }

    /**
     * Returns a matcher which matches elements (methods, classes, etc.)
     * with a given annotation.
     */
    public static Matcher annotatedWith(
            final Class annotationType) {
        return new AnnotatedWithType(annotationType);
    }

    /**
     * Returns a matcher which matches elements (methods, classes, etc.)
     * with a given annotation.
     */
    public static Matcher annotatedWith(
            final Annotation annotation) {
        return new AnnotatedWith(annotation);
    }

    /**
     * Returns a matcher which matches subclasses of the given type (as well as
     * the given type).
     */
    public static Matcher> subclassesOf(final Class superclass) {
        return new SubclassesOf(superclass);
    }

    /**
     * Returns a matcher which matches objects equal to the given object.
     */
    public static Matcher only(Object value) {
        return new Only(value);
    }

    /**
     * Returns a matcher which matches only the given object.
     */
    public static Matcher identicalTo(final Object value) {
        return new IdenticalTo(value);
    }

    /**
     * Returns a matcher which matches classes in the given package. Packages are specific to their
     * classloader, so classes with the same package name may not have the same package at runtime.
     */
    public static Matcher> inPackage(final Package targetPackage) {
        return new InPackage(targetPackage);
    }

    /**
     * Returns a matcher which matches classes in the given package and its subpackages. Unlike
     * {@link #inPackage(Package) inPackage()}, this matches classes from any classloader.
     */
    public static Matcher> inSubpackage(final String targetPackageName) {
        return new InSubpackage(targetPackageName);
    }

    /**
     * Returns a matcher which matches methods with matching return types.
     */
    public static Matcher returns(
            final Matcher> returnType) {
        return new Returns(returnType);
    }

    private static class Any extends AbstractMatcher {

        public boolean matches(Object o) {
            return true;
        }

        @Override
        public String toString() {
            return "any()";
        }

        public Object readResolve() {
            return any();
        }
    }

    private static class Not extends AbstractMatcher {
        final Matcher delegate;

        private Not(Matcher delegate) {
            this.delegate = checkNotNull(delegate, "delegate");
        }

        public boolean matches(T t) {
            return !delegate.matches(t);
        }

        @Override
        public boolean equals(Object other) {
            return other instanceof Not
                    && ((Not) other).delegate.equals(delegate);
        }

        @Override
        public int hashCode() {
            return -delegate.hashCode();
        }

        @Override
        public String toString() {
            return "not(" + delegate + ")";
        }
    }

    private static class AnnotatedWithType extends AbstractMatcher {
        private final Class annotationType;

        AnnotatedWithType(Class annotationType) {
            this.annotationType = checkNotNull(annotationType, "annotation type");
            checkForRuntimeRetention(annotationType);
        }

        public boolean matches(AnnotatedElement element) {
            return element.isAnnotationPresent(annotationType);
        }

        @Override
        public boolean equals(Object other) {
            return other instanceof AnnotatedWithType
                    && ((AnnotatedWithType) other).annotationType.equals(annotationType);
        }

        @Override
        public int hashCode() {
            return 37 * annotationType.hashCode();
        }

        @Override
        public String toString() {
            return "annotatedWith(" + annotationType.getSimpleName() + ".class)";
        }
    }

    private static class AnnotatedWith extends AbstractMatcher {
        private final Annotation annotation;

        public AnnotatedWith(Annotation annotation) {
            this.annotation = checkNotNull(annotation, "annotation");
            checkForRuntimeRetention(annotation.annotationType());
        }

        public boolean matches(AnnotatedElement element) {
            Annotation fromElement = element.getAnnotation(annotation.annotationType());
            return fromElement != null && annotation.equals(fromElement);
        }

        @Override
        public boolean equals(Object other) {
            return other instanceof AnnotatedWith
                    && ((AnnotatedWith) other).annotation.equals(annotation);
        }

        @Override
        public int hashCode() {
            return 37 * annotation.hashCode();
        }

        @Override
        public String toString() {
            return "annotatedWith(" + annotation + ")";
        }
    }

    private static class SubclassesOf extends AbstractMatcher> {
        private final Class superclass;

        SubclassesOf(Class superclass) {
            this.superclass = checkNotNull(superclass, "superclass");
        }

        @Override
        public boolean matches(Class subclass) {
            return superclass.isAssignableFrom(subclass);
        }

        @Override
        public boolean equals(Object other) {
            return other instanceof SubclassesOf
                    && ((SubclassesOf) other).superclass.equals(superclass);
        }

        @Override
        public int hashCode() {
            return 37 * superclass.hashCode();
        }

        @Override
        public String toString() {
            return "subclassesOf(" + superclass.getSimpleName() + ".class)";
        }
    }

    private static class Only extends AbstractMatcher {
        private final Object value;

        public Only(Object value) {
            this.value = checkNotNull(value, "value");
        }

        public boolean matches(Object other) {
            return value.equals(other);
        }

        @Override
        public boolean equals(Object other) {
            return other instanceof Only
                    && ((Only) other).value.equals(value);
        }

        @Override
        public int hashCode() {
            return 37 * value.hashCode();
        }

        @Override
        public String toString() {
            return "only(" + value + ")";
        }
    }

    private static class IdenticalTo extends AbstractMatcher {
        private final Object value;

        public IdenticalTo(Object value) {
            this.value = checkNotNull(value, "value");
        }

        public boolean matches(Object other) {
            return value == other;
        }

        @Override
        public boolean equals(Object other) {
            return other instanceof IdenticalTo
                    && ((IdenticalTo) other).value == value;
        }

        @Override
        public int hashCode() {
            return 37 * System.identityHashCode(value);
        }

        @Override
        public String toString() {
            return "identicalTo(" + value + ")";
        }
    }

    private static class InPackage extends AbstractMatcher> {
        private final transient Package targetPackage;
        private final String packageName;

        public InPackage(Package targetPackage) {
            this.targetPackage = checkNotNull(targetPackage, "package");
            this.packageName = targetPackage.getName();
        }

        public boolean matches(Class c) {
            return c.getPackage().equals(targetPackage);
        }

        @Override
        public boolean equals(Object other) {
            return other instanceof InPackage
                    && ((InPackage) other).targetPackage.equals(targetPackage);
        }

        @Override
        public int hashCode() {
            return 37 * targetPackage.hashCode();
        }

        @Override
        public String toString() {
            return "inPackage(" + targetPackage.getName() + ")";
        }

        public Object readResolve() {
            return inPackage(getClass().getClassLoader().getDefinedPackage(packageName));
        }
    }

    private static class InSubpackage extends AbstractMatcher> {
        private final String targetPackageName;

        InSubpackage(String targetPackageName) {
            this.targetPackageName = targetPackageName;
        }

        @Override
        public boolean matches(Class c) {
            String classPackageName = c.getPackage().getName();
            return classPackageName.equals(targetPackageName)
                    || classPackageName.startsWith(targetPackageName + ".");
        }

        @Override
        public boolean equals(Object other) {
            return other instanceof InSubpackage
                    && ((InSubpackage) other).targetPackageName.equals(targetPackageName);
        }

        @Override
        public int hashCode() {
            return 37 * targetPackageName.hashCode();
        }

        @Override
        public String toString() {
            return "inSubpackage(" + targetPackageName + ")";
        }
    }

    private static class Returns extends AbstractMatcher {
        private final Matcher> returnType;

        public Returns(Matcher> returnType) {
            this.returnType = checkNotNull(returnType, "return type matcher");
        }

        public boolean matches(Method m) {
            return returnType.matches(m.getReturnType());
        }

        @Override
        public boolean equals(Object other) {
            return other instanceof Returns
                    && ((Returns) other).returnType.equals(returnType);
        }

        @Override
        public int hashCode() {
            return 37 * returnType.hashCode();
        }

        @Override
        public String toString() {
            return "returns(" + returnType + ")";
        }
    }
}
    

    

    

            

    

            



    
    






    
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