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package net.java.ao.schema;

import java.util.Objects;

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

/**
 * Imposes an underscore word-separation convention on table
 * names.  This will convert entity names in the following way:
 *
 * 
 * 
 * 
 * 
 * 
 *
 * 
 * 
 * 
 * 
 *
 * 
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 * 
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 * Entity Name Table Name
Person person
LicenseRegistration license_registration
Volume4 volume_4
Company company
 *
 * This converter allows for both all-lowercase and all-uppercase
 * table name conventions.  For example, depending on the configuration,
 * LicenseRegistration may convert to "LICENSE_REGISTRATION".
 *
 * This converter, coupled with {@link PluralizedTableNameConverter} is
 * all that is required to emulate the ActiveRecord table name conversion.
 */
public final class UnderscoreTableNameConverter extends CanonicalClassNameTableNameConverter {
    private final Case tableNameCase;

    public UnderscoreTableNameConverter(Case tableNameCase) {
        this.tableNameCase = Objects.requireNonNull(tableNameCase, "tableNameCase can't be null");
    }

    @Override
    protected String getName(String entityClassCanonicalName) {
        return tableNameCase.apply(camelCaseToUnderScore(convertSimpleClassName(entityClassCanonicalName)));
    }
}

Entity Name	Table Name
`Person`	person
`LicenseRegistration`	license_registration
`Volume4`	volume_4
`Company`	company