impl/src/main/java/org/apache/geronimo/config/cdi/ConfigInjectionBean.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.geronimo.config.cdi;

import org.eclipse.microprofile.config.inject.ConfigProperty;

import javax.enterprise.context.Dependent;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.InjectionPoint;
import javax.enterprise.inject.spi.PassivationCapable;
import javax.enterprise.util.AnnotationLiteral;
import java.lang.annotation.Annotation;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;

/**
 * @author <a href="mailto:struberg@yahoo.de">Mark Struberg</a>
 */
public abstract class ConfigInjectionBean<T> implements Bean<T>, PassivationCapable {

    private final static Set<Annotation> QUALIFIERS = new HashSet<>();
    static {
        QUALIFIERS.add(new ConfigPropertyLiteral());
    }

    private final Class rawType;
    private final Set<Type> types;
    private final String id;
    private final boolean alternative;

    ConfigInjectionBean(Type type) {
        this(type,false);
    }

    ConfigInjectionBean(Type type, boolean alternative) {
        this.types = new HashSet<>();
        this.types.add(type);
        this.rawType = getRawType(type);
        this.id = "ConfigInjectionBean_" + type.toString();
        this.alternative = alternative;
    }

    private Class getRawType(Type type) {
        if (type instanceof Class) {
            return (Class) type;
        }
        else if (type instanceof ParameterizedType) {
            ParameterizedType paramType = (ParameterizedType) type;

            return (Class) paramType.getRawType();
        }

        throw new UnsupportedOperationException("No idea how to handle " + type);
    }

    @Override
    public Set<InjectionPoint> getInjectionPoints() {
        return Collections.emptySet();
    }

    @Override
    public Class<?> getBeanClass() {
        return rawType;
    }

    @Override
    public boolean isNullable() {
        return false;
    }

    @Override
    public void destroy(T instance, CreationalContext<T> context) {
        // no-op
    }

    @Override
    public Set<Type> getTypes() {
        return types;
    }

    @Override
    public Set<Annotation> getQualifiers() {
        return QUALIFIERS;
    }

    @Override
    public Class<? extends Annotation> getScope() {
        return Dependent.class;
    }

    @Override
    public String getName() {
        return null;
    }

    @Override
    public Set<Class<? extends Annotation>> getStereotypes() {
        return Collections.emptySet();
    }

    @Override
    public boolean isAlternative() {
        return alternative;
    }

    @Override
    public String getId() {
        return id;
    }

    private static class ConfigPropertyLiteral extends AnnotationLiteral<ConfigProperty> implements ConfigProperty {
        @Override
        public String name() {
            return "";
        }

        @Override
        public String defaultValue() {
            return "";
        }
    }
}