org.fuwjax.oss.generic.Spec Maven / Gradle / Ivy

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Healthy Dependency Injection
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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.generic;

import org.fuwjax.oss.util.Members;
import org.fuwjax.oss.util.Streams;
import org.fuwjax.oss.util.Types;
import org.fuwjax.oss.util.collection.ListDecorator;

import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Set;
import java.util.TreeSet;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.stream.Stream;

/**
 * Created by fuwjax on 2/18/15.
 */
public class Spec {
    private static ConcurrentMap specs = new ConcurrentHashMap<>();
    private final Type type;

    public static Spec of(final Type type) {
        if (Types.isInstantiable(type)) {
            return specs.computeIfAbsent(type, Spec::new);
        }
        throw new IllegalArgumentException("Type is not instantiable: " + type);
    }

    private List members;

    private Spec(Type type) {
        this.type = type;
        if (type instanceof Class) {
            members = new ArrayList<>();
            Class cls = (Class) type;
            Arrays.asList(cls.getDeclaredConstructors()).forEach(c -> members.add(new ConstructorMember(c)));
            Arrays.asList(cls.getDeclaredMethods()).forEach(m -> members.add(new MethodMember(m)));
            Arrays.asList(cls.getDeclaredFields()).forEach(f -> members.add(new GetFieldMember(f)));
            Arrays.asList(cls.getDeclaredFields()).forEach(f -> members.add(new SetFieldMember(f)));
            for (Class sup = cls.getSuperclass(); sup != null; sup = sup.getSuperclass()) {
                Arrays.asList(sup.getDeclaredMethods()).stream().filter(Members::isNotStatic).forEach(m -> members.add(new MethodMember(m)));
                Arrays.asList(sup.getDeclaredFields()).stream().filter(Members::isNotStatic).forEach(f -> members.add(new GetFieldMember(f)));
                Arrays.asList(sup.getDeclaredFields()).stream().filter(Members::isNotStatic).forEach(f -> members.add(new SetFieldMember(f)));
            }
        } else {
            ParameterizedType p = (ParameterizedType) type;
            Spec raw = of(p.getRawType());
            members = new ListDecorator<>(raw.members, m -> new ResolvedMember(m, p));
        }
    }

    public Stream members() {
        return members.stream();
    }

    @Override
    public String toString() {
        return type.toString();
    }
}