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HSQLDB example source code file (HsqlNameManager.java)

This example HSQLDB source code file (HsqlNameManager.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - HSQLDB tags/keywords

a, hsqlname, hsqlname, hsqlnamemanager, hsqlnamemanager, string, string, stringbuffer, stringbuffer, sys_, sys_ct_, sys_idx_, sys_ref_, z

The HSQLDB HsqlNameManager.java source code

/* Copyright (c) 2001-2008, The HSQL Development Group
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of the HSQL Development Group nor the names of its
 * contributors may be used to endorse or promote products derived from this
 * software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */


package org.hsqldb;

import org.hsqldb.lib.StringConverter;

/**
 * Provides Name Management for SQL objects. <p>
 *
 * This class now includes the HsqlName class introduced in 1.7.1 and improves
 * auto-naming with multiple databases in the engine.<p>
 *
 * Methods check user defined names and issue system generated names
 * for SQL objects.<p>
 *
 * This class does not deal with the type of the SQL object for which it
 * is used.<p>
 *
 * Some names beginning with SYS_ are reserved for system generated names.
 * These are defined in isReserveName(String name) and created by the
 * makeAutoName(String type) factory method<p>
 *
 * sysNumber is used to generate system-generated names. It is
 * set to the largest integer encountered in names that use the
 * SYS_xxxxxxx_INTEGER format. As the DDL is processed before any ALTER
 * command, any new system generated name will have a larger integer suffix
 * than all the existing names.
 *
 * @author fredt@users
 * @version 1.8.0
 * @since 1.7.2
 */
public class HsqlNameManager {

    private static HsqlNameManager staticManager = new HsqlNameManager();

    static {
        staticManager.serialNumber = Integer.MIN_VALUE;
    }

    private int serialNumber = 1;    // 0 is reserved in lookups
    private int sysNumber    = 0;

    static HsqlName newHsqlSystemObjectName(String name) {
        return new HsqlName(staticManager, name);
    }

    public HsqlName newHsqlName(String name, boolean isquoted) {
        return new HsqlName(this, name, isquoted);
    }

    HsqlName newHsqlName(String prefix, String name, boolean isquoted) {
        return new HsqlName(this, prefix, name, isquoted);
    }

    HsqlName newHsqlName(String name) {
        return new HsqlName(this, name);
    }

    /**
     * Auto names are used for autogenerated indexes or anonymous constraints.
     * Also the name of a pseudo-column is the autoname ""
     */
    public HsqlName newAutoName(String type) {
        return newAutoName(type, null);
    }

    /**
     * Auto names are used for autogenerated indexes or anonymous constraints.
     */
    HsqlName newAutoName(String type, String namepart) {

        StringBuffer sbname = new StringBuffer();

        if (type != null) {
            if (type.length() != 0) {
                sbname.append("SYS_");
                sbname.append(type);
                sbname.append('_');

                if (namepart != null) {
                    sbname.append(namepart);
                    sbname.append('_');
                }

                sbname.append(++sysNumber);
            }
        } else {
            sbname.append(namepart);
        }

        return new HsqlName(this, sbname.toString());
    }

    void resetNumbering() {
        sysNumber    = 0;
        serialNumber = 0;
    }

    public static class HsqlName {

        HsqlNameManager   manager;
        public String     name;
        boolean           isNameQuoted;
        public String     statementName;
        public HsqlName   schema;
        private final int hashCode;

        private HsqlName(HsqlNameManager man) {
            manager  = man;
            hashCode = manager.serialNumber++;
        }

        private HsqlName(HsqlNameManager man, String name, boolean isquoted) {

            this(man);

            rename(name, isquoted);
        }

        private HsqlName(HsqlNameManager man, String prefix, String name,
                         boolean isquoted) {

            this(man);

            rename(prefix, name, isquoted);
        }

        private HsqlName(HsqlNameManager man, String name) {

            this(man);

            this.name = this.statementName = name;
        }

        public void rename(String name, boolean isquoted) {

            this.name          = name;
            this.statementName = name;
            this.isNameQuoted  = isquoted;

            if (isNameQuoted) {
                statementName = StringConverter.toQuotedString(name, '"',
                        true);
            }

            if (name.startsWith("SYS_")) {
                int length = sysPrefixLength(name);

                if (length > 0) {
                    try {
                        int temp = Integer.parseInt(name.substring(length));

                        if (temp > manager.sysNumber) {
                            manager.sysNumber = temp;
                        }
                    } catch (NumberFormatException e) {}
                }
            }
        }

        void rename(String prefix, String name, boolean isquoted) {

            StringBuffer sbname = new StringBuffer(prefix);

            sbname.append('_');
            sbname.append(name);
            rename(sbname.toString(), isquoted);
        }

        public boolean equals(Object other) {

            if (other instanceof HsqlName) {
                return hashCode == ((HsqlName) other).hashCode;
            }

            return false;
        }

        /**
         * hash code for this object is its unique serial number.
         */
        public int hashCode() {
            return hashCode;
        }

        /**
         * "SYS_IDX_" is used for auto-indexes on referring FK columns or
         * unique constraints.
         * "SYS_PK_" is for the primary key constraints
         * "SYS_CT_" is for unique and check constraints
         * "SYS_REF_" is for FK constraints in referenced tables
         * "SYS_FK_" is for FK constraints in referencing tables
         *
         */
        static final String[] sysPrefixes = new String[] {
            "SYS_IDX_", "SYS_PK_", "SYS_REF_", "SYS_CT_", "SYS_FK_",
        };

        static int sysPrefixLength(String name) {

            for (int i = 0; i < sysPrefixes.length; i++) {
                if (name.startsWith(sysPrefixes[i])) {
                    return sysPrefixes[i].length();
                }
            }

            return 0;
        }

        static boolean isReservedName(String name) {
            return sysPrefixLength(name) > 0;
        }

        boolean isReservedName() {
            return isReservedName(name);
        }

        public String toString() {

            return getClass().getName() + super.hashCode()
                   + "[this.hashCode()=" + this.hashCode + ", name=" + name
                   + ", name.hashCode()=" + name.hashCode()
                   + ", isNameQuoted=" + isNameQuoted + "]";
        }

        public int compareTo(Object o) {
            return hashCode - o.hashCode();
        }

        /**
         * Returns true if the identifier consists of all uppercase letters
         * digits and underscore, beginning with a letter and is not in the
         * keyword list.
         */
        static boolean isRegularIdentifier(String name) {

            for (int i = 0, length = name.length(); i < length; i++) {
                int c = name.charAt(i);

                if (c >= 'A' && c <= 'Z') {
                    continue;
                } else if (c == '_' && i > 0) {
                    continue;
                } else if (c >= '0' && c <= '9') {
                    continue;
                }

                return false;
            }

            return !Token.isKeyword(name);
        }
    }
}

Other HSQLDB examples (source code examples)

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