org.fuwjax.oss.inject.BindConstraint Maven / Gradle / Ivy

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/*
 * Copyright (C) 2015 fuwjax.org ([email protected])
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.fuwjax.oss.inject;

import org.fuwjax.oss.generic.AnnotatedDeclaration;
import org.fuwjax.oss.generic.GenericMember;
import org.fuwjax.oss.generic.GenericMember.MemberAccess;
import org.fuwjax.oss.util.ObjectAssist;
import org.fuwjax.oss.util.Types;
import sun.security.util.Cache;

import javax.inject.Qualifier;
import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedType;
import java.lang.reflect.Type;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
import java.util.Set;
import java.util.function.Predicate;
import java.util.stream.Collectors;

import static java.util.Arrays.asList;
import static java.util.stream.Collectors.toSet;
import static org.fuwjax.oss.generic.GenericMember.MemberAccess.PROTECTED;
import static org.fuwjax.oss.generic.GenericMember.MemberAccess.PUBLIC;

/**
 * Created by fuwjax on 2/26/15.
 */
public class BindConstraint extends ObjectAssist.Base implements Predicate {
    private final Type type;
    private final MemberAccess access;
    private final Set annotations;

    private BindConstraint(Type type, MemberAccess access, Annotation... annotations) {
        this(access, type, asList(annotations).stream().filter(BindConstraint::isQualified).collect(toSet()));
    }

    private BindConstraint(MemberAccess access, Type type, Set annotations) {
        super(type, annotations); // access intentionally omitted
        this.access = access;
        this.type = type;
        this.annotations = annotations;
    }

    private static boolean isQualified(Annotation annotation) {
        return annotation.annotationType().isAnnotationPresent(Qualifier.class);
    }

    BindConstraint(Type type, Annotation... annotations) {
        this(type, PUBLIC, annotations);
    }

    BindConstraint(AnnotatedDeclaration type){
        this(type.type(), PROTECTED, type.element().getAnnotations());
    }

    public Type type() {
        return type;
    }

    @Override
    public boolean test(GenericMember member) {
        if (!Types.isAssignable(member.returnType().type(), type)) {
            return false;
        }
        if (!access.test(member)) {
            return false;
        }
        for (Annotation annotation : annotations) {
            Annotation[] a = member.source().getAnnotationsByType(annotation.annotationType());
            if (!asList(a).contains(annotation)) {
                return false;
            }
        }
        return true;
    }
}