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/*
 * Copyright 2017-2020 original authors
 *
 * 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.
 */
package io.micronaut.jdbc.metadata;

import javax.sql.DataSource;

/**
 * A base {@link DataSourcePoolMetadata} implementation.
 *
 * @param  the data source type
 * @author Stephane Nicoll
 * @author Christian Oestreich
 * @since 2.0.0
 */
public abstract class AbstractDataSourcePoolMetadata implements DataSourcePoolMetadata {

    private final T dataSource;

    /**
     * Create an instance with the data source to use.
     *
     * @param dataSource the data source
     */
    protected AbstractDataSourcePoolMetadata(T dataSource) {
        this.dataSource = dataSource;
    }

    @Override
    public Float getUsage() {
        Integer maxSize = getMax();
        Integer currentSize = getActive();
        if (maxSize == null || currentSize == null) {
            return null;
        }
        if (maxSize < 0) {
            return -1F;
        }
        if (currentSize == 0) {
            return 0F;
        }
        return (float) currentSize / (float) maxSize;
    }

    /**
     * {@inheritDoc}
     */
    public T getDataSource() {
        return this.dataSource;
    }
}