org.jspresso.framework.model.persistence.hibernate.dialect.Oracle10gDialect.java Source code

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Here is the source code for org.jspresso.framework.model.persistence.hibernate.dialect.Oracle10gDialect.java

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/*
 * Copyright (c) 2005-2016 Vincent Vandenschrick. All rights reserved.
 *
 *  This file is part of the Jspresso framework.
 *
 *  Jspresso is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  Jspresso is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with Jspresso.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.jspresso.framework.model.persistence.hibernate.dialect;

import java.sql.Types;
import java.util.HashSet;
import java.util.Set;
import java.util.StringTokenizer;

import org.apache.commons.lang3.RandomStringUtils;

/**
 * Customized Oracle 10g dialect.
 *
 * @author Vincent Vandenschrick
 */
public class Oracle10gDialect extends org.hibernate.dialect.Oracle10gDialect {

    // /**
    // * Maps dates differently.
    // * <p>
    // * {@inheritDoc}
    // */
    // @Override
    // protected void registerDateTimeTypeMappings() {
    // registerColumnType(Types.DATE, "date");
    // registerColumnType(Types.TIME, "date");
    // registerColumnType(Types.TIMESTAMP, "date");
    // }

    /**
     * Maps integers differently.
     * <p>
     * {@inheritDoc}
     */
    @Override
    protected void registerNumericTypeMappings() {
        super.registerNumericTypeMappings();
        registerColumnType(Types.INTEGER, "number($p,0)");
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void registerCharacterTypeMappings() {
        super.registerCharacterTypeMappings();
        registerColumnType(Types.VARCHAR, "clob");
    }

    /**
     * {@inheritDoc}
     */
    @Override
    protected void registerLargeObjectTypeMappings() {
        super.registerLargeObjectTypeMappings();
        registerColumnType(Types.VARBINARY, "blob");
    }

    /**
     * Eliminates duplicate aliases.
     * <p>
     * {@inheritDoc}
     */
    @Override
    public String transformSelectString(String select) {
        return eliminateDuplicateColumnAliases(select);
    }

    private String eliminateDuplicateColumnAliases(String sql) {
        Set<String> usedAliases = new HashSet<>();
        String[] aliasesSplit = sql.split(" as ");
        StringBuilder buff = new StringBuilder(aliasesSplit[0]);
        if (aliasesSplit.length > 1) {
            for (int i = 1; i < aliasesSplit.length; i++) {
                StringTokenizer aliasTokenizer = new StringTokenizer(aliasesSplit[i], ", ", true);
                String alias = aliasTokenizer.nextToken();
                int offset = aliasesSplit[i].indexOf(alias) + alias.length();
                while (usedAliases.contains(alias)) {
                    alias = alias.substring(0, alias.length() - 2)
                            + RandomStringUtils.randomAlphanumeric(1).toLowerCase() + "_";
                }
                usedAliases.add(alias);
                buff.append(" as ");
                buff.append(alias);
                buff.append(aliasesSplit[i].substring(offset));
            }
        }
        return buff.toString();
    }
}