com.github.romanqed.jeflect.fields.FieldAccessorFactory Maven / Gradle / Ivy

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A set of utilities designed to interact with reflection and speed up it.

There is a newer version: 5.0.0

package com.github.romanqed.jeflect.fields;

import com.github.romanqed.jeflect.DefineClassLoader;
import com.github.romanqed.jeflect.DefineLoader;
import com.github.romanqed.jeflect.DefineObjectFactory;
import com.github.romanqed.jeflect.ObjectFactory;

import java.lang.reflect.Field;
import java.util.Objects;

/**
 * A class representing a factory that creates
 * {@link FieldAccessor} instances for subsequent access to the field.
 * Access occurs at almost native speed, minus the time to call the proxy class method.
 */
public final class FieldAccessorFactory {
    private static final String ACCESSOR = "Accessor";
    private final ObjectFactory factory;

    public FieldAccessorFactory(ObjectFactory factory) {
        this.factory = Objects.requireNonNull(factory);
    }

    public FieldAccessorFactory(DefineLoader loader) {
        this(new DefineObjectFactory<>(loader));
    }

    public FieldAccessorFactory() {
        this(new DefineClassLoader());
    }

    /**
     * Creates a proxy implementation of the {@link FieldAccessor} interface for the specified field.
     *
     * @param field the target field
     * @return object of the generated proxy class implementing the {@link FieldAccessor} interface
     */
    public FieldAccessor packField(Field field) {
        var toHash = field.getDeclaringClass().getName() + field.getName();
        var name = ACCESSOR + toHash.hashCode();
        return factory.create(name, () -> FieldUtil.createAccessor(name, field));
    }
}