com.github.leeonky.dal.extensions.MetaProperties Maven / Gradle / Ivy

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package com.github.leeonky.dal.extensions;

import com.github.leeonky.dal.DAL;
import com.github.leeonky.dal.runtime.*;
import com.github.leeonky.util.BeanClass;
import com.github.leeonky.util.NoSuchAccessorException;

import java.util.Set;

import static com.github.leeonky.dal.runtime.Order.BUILD_IN;
import static java.lang.String.format;

@Order(BUILD_IN)
public class MetaProperties implements Extension {
    private static Object size(MetaData metaData) {
        Data data = metaData.data();
        if (data.isList())
            return data.list().size();
        throw new IllegalStateException(format("Invalid meta property `size` for: %s", data.dumpAll()));
    }

    private static Object throw_(MetaData metaData) {
        Throwable error = metaData.catchError();
        if (error == null)
            throw new AssertionError("Expecting an error to be thrown, but nothing was thrown");
        return error;
    }

    private static Object object_(MetaData metaData) {
        return metaData.data().instance() == null ? null : new OriginalJavaObject(metaData.data());
    }

    private static Object keys(MetaData metaData) {
        return metaData.data().fieldNames();
    }

    @Override
    public void extend(DAL dal) {
        dal.getRuntimeContextBuilder()
                .registerMetaProperty("size", MetaProperties::size)
                .registerMetaProperty("throw", MetaProperties::throw_)
                .registerMetaProperty("object", MetaProperties::object_)
                .registerMetaProperty("keys", MetaProperties::keys)
                .registerPropertyAccessor(OriginalJavaObject.class, new PropertyAccessor() {
                    @Override
                    public Object getValue(OriginalJavaObject javaObject, Object property) {
                        return javaObject.getValue(property);
                    }

                    @Override
                    public Set