/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
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 *  https://www.apache.org/licenses/LICENSE-2.0
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 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Other licenses:
 * -----------------------------------------------------------------------------
 * Commercial licenses for this work are available. These replace the above
 * Apache-2.0 license and offer limited warranties, support, maintenance, and
 * commercial database integrations.
 *
 * For more information, please visit: https://www.jooq.org/legal/licensing
 *
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 */

package org.jooq.impl;

import static org.jooq.SortOrder.DESC;
import static org.jooq.impl.Tools.allMatch;
import static org.jooq.impl.Tools.anyMatch;

import java.util.List;

import org.jooq.Field;
import org.jooq.SortField;
import org.jooq.SortOrder;

/**
 * @author Lukas Eder
 */
final class SortFieldList extends QueryPartList<SortField<?>> {

    SortFieldList() {
        this(emptyList());
    }

    SortFieldList(List<SortField<?>> wrappedList) {
        super(wrappedList);
    }

    final void addAll(Field<?>... fields) {
        addAll(Tools.map(fields, f -> f.asc()));
    }

    @Override
    final boolean canAdd(SortField<?> e) {
        return super.canAdd(e) && !(e instanceof NoField);
    }

    /**
     * Whether the {@link SortField}s in this list are uniformly sorted, e.g.
     * all {@link SortOrder#ASC} or all {@link SortOrder#DESC}.
     */
    final boolean uniform() {
        return allMatch(this, f -> (f.getOrder() == DESC) == (get(0).getOrder() == DESC));
    }

    /**
     * Whether any of the {@link SortField}s in this list contains a
     * <code>NULLS FIRST</code> or <code>NULLS LAST</code> clause.
     */
    final boolean nulls() {
        return anyMatch(this, f -> f.$nullOrdering() != null);
    }

    final List<Field<?>> fields() {
        return Tools.map(this, f -> f.$field());
    }
}
