org.babyfish.jimmer.sql.DraftPreProcessorManager Maven / Gradle / Ivy

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A revolutionary ORM framework for both java and kotlin
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package org.babyfish.jimmer.sql;

import org.apache.commons.lang3.reflect.TypeUtils;
import org.babyfish.jimmer.Draft;
import org.babyfish.jimmer.impl.util.TypeCache;
import org.babyfish.jimmer.meta.ImmutableProp;
import org.babyfish.jimmer.meta.ImmutableType;
import org.babyfish.jimmer.meta.TypedProp;
import org.babyfish.jimmer.runtime.ImmutableSpi;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.*;

class DraftPreProcessorManager {

    private final Map>> processorMap;

    private final TypeCache> cache =
            new TypeCache<>(this::create, true);

    DraftPreProcessorManager(Collection> processors) {
        Map>> processorMap = new HashMap<>();
        for (DraftPreProcessor processor : processors) {
            if (processor != null) {
                Map, Type> argTypeMap = TypeUtils
                        .getTypeArguments(
                                processor.getClass(),
                                DraftPreProcessor.class
                        );
                if (argTypeMap.isEmpty()) {
                    throw new IllegalArgumentException(
                            "Illegal draft processor type \"" +
                                    processor.getClass().getName() +
                                    "\", it extends \"" +
                                   DraftPreProcessor.class.getName() +
                                    "\" but the generic type arguments are not specified"
                    );
                }
                TypeVariable[] typeVariables = DraftPreProcessor.class.getTypeParameters();
                Type draftType = argTypeMap.get(typeVariables[0]);
                if (!(draftType instanceof Class) ||
                        !(((Class)draftType).isInterface()) ||
                        !Draft.class.isAssignableFrom((Class)draftType)) {
                    throw new IllegalArgumentException(
                            "Illegal draft processor type \"" +
                                    processor.getClass().getName() +
                                    "\", it extends \"" +
                                    DraftPreProcessor.class.getName() +
                                    "\" but its draft type \"" +
                                    draftType +
                                    "\" is not non-generic interface type extends " +
                                    "\"" +
                                    Draft.class.getName() +
                                    "\""
                    );
                }
                ImmutableType immutableType = ImmutableType.get((Class) draftType);
                Class entityType = immutableType.getJavaClass();
                if (!entityType.isInterface() || (
                                entityType.getAnnotation(Entity.class) == null &&
                                        entityType.getAnnotation(MappedSuperclass.class) == null
                        )
                ) {
                    throw new IllegalArgumentException(
                            "Illegal draft processor type \"" +
                                    processor.getClass().getName() +
                                    "\", it extends \"" +
                                    DraftPreProcessor.class.getName() +
                                    "\" but the processed entity type \"" +
                                    entityType +
                                    "\" is not interface type decorated by \"@" +
                                    Entity.class.getName() +
                                    "\" or \"@" +
                                    MappedSuperclass.class.getName() +
                                    "\""
                    );
                }
                processorMap
                        .computeIfAbsent(immutableType, it -> new ArrayList<>())
                        .add(processor);
            }
        }
        this.processorMap = processorMap;
    }

    public DraftPreProcessor get(ImmutableType type) {
        return cache.get(type);
    }

    @SuppressWarnings("unchecked")
    private DraftPreProcessor create(ImmutableType type) {
        List> processors = new ArrayList<>();
        Set allTypes = type.getAllTypes();
        for (ImmutableType t : allTypes) {
            List> list = processorMap.get(t);
            if (list != null) {
                processors.addAll(list);
            }
        }
        if (processors.isEmpty()) {
            return null;
        }

        return new DraftPreProcessor() {
            @Override
            public void beforeSave(@NotNull Draft draft) {
                for (DraftPreProcessor processor : processors) {
                    ((DraftPreProcessor)processor).beforeSave(draft);
                }
            }
        };
    }
}