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Ness JDBI support

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/**
 * Copyright (C) 2012 Ness Computing, Inc.
 *
 * 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
 *
 * 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 com.nesscomputing.jdbi.mapper;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import org.apache.commons.lang3.StringUtils;
import org.skife.jdbi.v2.tweak.ResultSetMapper;

/**
 * A result set mapper that allows efficient retrieval of fields using a prefix (i.e. if multiple elements
 * are returned from a query.
 */
public abstract class PrefixResultSetMapper implements ResultSetMapper
{
    private final String prefix;

    private final Map fieldNameCache = new ConcurrentHashMap();

    protected PrefixResultSetMapper(final String prefix)
    {
        this.prefix = StringUtils.isBlank(prefix) ? null : prefix;
    }

    protected String buildName(final String fieldName)
    {
        if (prefix == null) {
            return fieldName;
        }

        if (fieldNameCache.containsKey(fieldName)) {
            return fieldNameCache.get(fieldName);
        }
        else {
            final String result = prefix + fieldName;
            fieldNameCache.put(fieldName, result);
            return result;
        }
    }
}