com.github.fabriciofx.cactoos.jdbc.result.ResultSetAsRows Maven / Gradle / Ivy

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/*
 * The MIT License (MIT)
 *
 * Copyright (C) 2018-2022 Fabrício Barros Cabral
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.github.fabriciofx.cactoos.jdbc.result;

import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import org.cactoos.Scalar;
import org.cactoos.scalar.Sticky;
import org.cactoos.scalar.Unchecked;

/**
 * Rows as ResultSet.
 *
 * @since 0.1
 */
public final class ResultSetAsRows implements Iterable> {
    /**
     * Rows.
     */
    private final Scalar>> rows;

    /**
     * Ctor.
     * @param rst A ResultSet
     */
    public ResultSetAsRows(final ResultSet rst) {
        this.rows = new Sticky<>(
            () -> {
                final List> rws = new LinkedList<>();
                final ResultSetMetaData rsmd = rst.getMetaData();
                final int cols = rsmd.getColumnCount();
                while (rst.next()) {
                    final Map fields = new LinkedHashMap<>();
                    for (int idx = 1; idx <= cols; ++idx) {
                        final String name = rsmd.getColumnName(idx)
                            .toLowerCase(Locale.ENGLISH);
                        final Object data = rst.getObject(idx);
                        fields.put(name, data);
                    }
                    rws.add(fields);
                }
                return rws;
            }
        );
    }

    @Override
    public Iterator> iterator() {
        return new Unchecked<>(this.rows).value().iterator();
    }
}