/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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
 *
 *     http://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.
 */

package org.apache.shardingsphere.driver.jdbc.adapter.executor;

import java.sql.SQLException;
import java.util.Collection;
import java.util.LinkedList;

/**
 * Force execute template.
 *
 * @param <T> type of targets to be executed
 */
public final class ForceExecuteTemplate<T> {
    
    /**
     * Force execute.
     * 
     * @param targets targets to be executed
     * @param callback force execute callback
     * @throws SQLException throw SQL exception after all targets are executed
     */
    public void execute(final Collection<T> targets, final ForceExecuteCallback<T> callback) throws SQLException {
        Collection<SQLException> exceptions = new LinkedList<>();
        for (T each : targets) {
            try {
                callback.execute(each);
            } catch (final SQLException ex) {
                exceptions.add(ex);
            }
        }
        throwSQLExceptionIfNecessary(exceptions);
    }
    
    private void throwSQLExceptionIfNecessary(final Collection<SQLException> exceptions) throws SQLException {
        if (exceptions.isEmpty()) {
            return;
        }
        SQLException ex = new SQLException("");
        exceptions.forEach(ex::setNextException);
        throw ex;
    }
}
