/*
 * 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
 *
 *  https://www.apache.org/licenses/LICENSE-2.0
 *
 * 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.meta;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.regex.Pattern;

import org.jooq.DSLContext;
import org.jooq.Result;

/**
 * A cache for {@link Pattern} instances.
 *
 * @author Lukas Eder
 */
final class Statements {

    private DSLContext                   ctx;
    private final Map<String, Result<?>> sqlCache;
    private final Map<String, Set<?>>    sqlCacheSingleColumnSet;

    Statements() {
        this.sqlCache = new HashMap<>();
        this.sqlCacheSingleColumnSet = new HashMap<>();
    }

    final void dslContext(DSLContext c) {
        this.ctx = c;
    }

    final Result<?> fetch(String sql) {
        return sqlCache.computeIfAbsent(sql, ctx::fetch);
    }

    final Set<?> fetchSet(String sql) {
        return sqlCacheSingleColumnSet.computeIfAbsent(sql, s -> fetch(s).intoSet(0));
    }

    @SuppressWarnings("unchecked")
    final <T> Set<T> fetchSet(String sql, Class<T> type) {
        return (Set<T>) sqlCacheSingleColumnSet.computeIfAbsent(sql, s -> fetch(s).intoSet(0, type));
    }
}
