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This is the core library for Active Objects. It is generic and can be embedded in any environment. As such it is generic and won't contain all connection pooling, etc.

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/*
 * Copyright 2007 Daniel Spiewak
 *
 * 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 net.java.ao.schema;

import java.util.List;
import java.util.Objects;

import static net.java.ao.schema.UnderScoreUtils.camelCaseToUnderScore;

/**
 * Imposes an underscore word-separation convention upon field names.
 * This will convert field in the following way:
 *
 * 
 * 
 * 
 * 
 * 
 * 
 *
 * 
 * 
 * 
 * 
 * 
 *
 * 
 * 
 * 
 * 
 * 
 *
 * 
 * 
 * 
 * 
 * 
 *
 * 
 * 
 * 
 * 
 * 
 * Method Name Returns Entity? Field Name
getFirstName false first_name
setLastName false last_name
getCompany true company_id
isCool false cool
 *
 * This converter allows for both all-lowercase and all-uppercase
 * field name conventions.  For example, depending on the configuration,
 * getLastName may convert to "LAST_NAME".
 *
 * This converter is all that is required to emulate the ActiveRecord
 * field name conversion.
 *
 * @author Daniel Spiewak
 */
public final class UnderscoreFieldNameConverter extends AbstractFieldNameConverter {
    private final Case fieldNameCase;

    /**
     * Creates a new field name converter in which all field names will
     * be either fully uppercase or fully lowercase.
     *
     * @param fieldNameCase the case to use for field names
     */
    public UnderscoreFieldNameConverter(Case fieldNameCase) {
        this.fieldNameCase = Objects.requireNonNull(fieldNameCase, "fieldNameCase can't be null");
    }

    public UnderscoreFieldNameConverter(Case fieldNameCase, List fieldNameResolvers) {
        super(fieldNameResolvers);
        this.fieldNameCase = Objects.requireNonNull(fieldNameCase, "fieldNameCase can't be null");
    }

    @Override
    public String convertName(String name) {
        return fieldNameCase.apply(camelCaseToUnderScore(name));
    }
}

Method Name	Returns Entity?	Field Name
getFirstName	`false`	first_name
setLastName	`false`	last_name
getCompany	`true`	company_id
isCool	`false`	cool