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package org.nd4j.autodiff.samediff.array;

import lombok.NonNull;
import org.nd4j.autodiff.samediff.ArrayHolder;
import org.nd4j.linalg.api.ndarray.INDArray;

import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

/**
 * A simple {@link ArrayHolder} that uses a simple {@code Map} internally.
 * No thread safety guarantees
 *
 * @author Alex Black
 */
public class SingleThreadArrayHolder implements ArrayHolder {

    private final Map map = new HashMap<>();

    @Override
    public boolean hasArray(@NonNull String name) {
        return map.containsKey(name);
    }

    @Override
    public INDArray getArray(@NonNull String name) {
        return map.get(name);
    }

    @Override
    public void setArray(@NonNull String name, @NonNull INDArray array) {
        map.put(name, array);
    }

    @Override
    public INDArray removeArray(@NonNull String name) {
        return map.remove(name);
    }

    @Override
    public int size() {
        return map.size();
    }

    @Override
    public void initFrom(ArrayHolder arrayHolder) {
        map.clear();
        Collection names = arrayHolder.arrayNames();
        for (String n : names) {
            map.put(n, arrayHolder.getArray(n));
        }
    }

    @Override
    public Collection arrayNames() {
        return Collections.unmodifiableCollection(map.keySet());
    }

    @Override
    public void rename(String from, String to) {
        INDArray arr = map.remove(from);
        map.put(to, arr);
    }
}