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sphere-common

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package io.sphere.sdk.search.model;

import io.sphere.sdk.models.Base;

import javax.annotation.Nullable;
import java.util.Optional;
import java.util.function.Function;

import static io.sphere.sdk.utils.IterableUtils.toStream;
import static java.util.Objects.requireNonNull;
import static java.util.stream.Collectors.joining;

abstract class SearchModelExpression extends Base {
    private final SearchModel searchModel;
    private final Function typeSerializer;
    @Nullable
    protected final String alias;

    protected SearchModelExpression(final SearchModel searchModel, final Function typeSerializer, @Nullable final String alias) {
        this.searchModel = requireNonNull(searchModel);
        this.typeSerializer = requireNonNull(typeSerializer);
        this.alias = alias;
    }

    public final String expression() {
        return attributePath() + Optional.ofNullable(value()).orElse("") + Optional.ofNullable(alias).map(a -> " as " + a).orElse("");
    }

    public final String attributePath() {
        return toStream(searchModel.buildPath()).collect(joining("."));
    }

    public final String resultPath() {
        return Optional.ofNullable(alias).orElse(attributePath());
    }

    @Nullable
    protected String alias() {
        return alias;
    }

    @Nullable
    protected abstract String value();

    protected Function serializer() {
        return typeSerializer;
    }

    @Override
    public String toString() {
        return expression();
    }

    @Override
    public final int hashCode() {
        return expression().hashCode();
    }
}