Source Code Cross Referenced for Query.java in  » Database-Client » squirrel-sql-2.6.5a » net » sourceforge » squirrel_sql » plugins » favs » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database Client » squirrel sql 2.6.5a » net.sourceforge.squirrel_sql.plugins.favs 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        package net.sourceforge.squirrel_sql.plugins.favs;
002:
003:        /*
004:         * Copyright (C) 2001 Colin Bell
005:         * colbell@users.sourceforge.net
006:         *
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License
009:         * as published by the Free Software Foundation; either version 2
010:         * of the License, or any later version.
011:         *
012:         * This program is distributed in the hope that it will be useful,
013:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
014:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
015:         * GNU General Public License for more details.
016:         *
017:         * You should have received a copy of the GNU General Public License
018:         * along with this program; if not, write to the Free Software
019:         * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
020:         */
021:        import java.io.Serializable;
022:
023:        import net.sourceforge.squirrel_sql.client.util.IdentifierFactory;
024:        import net.sourceforge.squirrel_sql.fw.id.IHasIdentifier;
025:        import net.sourceforge.squirrel_sql.fw.id.IIdentifier;
026:        import net.sourceforge.squirrel_sql.fw.persist.IValidatable;
027:
028:        /**
029:         * This class represents a query that can be saved and restored.
030:         */
031:        final class Query implements  Cloneable, Serializable, IHasIdentifier,
032:                IValidatable {
033:
034:            private static final long serialVersionUID = 1L;
035:
036:            private static final String EMPTY_STRING = "";
037:
038:            public interface IPropertyNames {
039:                String DESCRIPTION = "Description";
040:                String ID = "Identifier";
041:                String NAME = "Name";
042:                String SQL = "Sql";
043:            }
044:
045:            /** The <CODE>IIdentifier</CODE> that uniquely identifies this object. */
046:            private IIdentifier _id;
047:
048:            /** Name. */
049:            private String _name;
050:
051:            /** Description for this query. */
052:            @SuppressWarnings("unused")
053:            private String _description;
054:
055:            /** SQL. */
056:            private String _sql;
057:
058:            /**
059:             * Default ctor.
060:             */
061:            public Query() {
062:                this (IdentifierFactory.getInstance().createIdentifier(),
063:                        EMPTY_STRING, EMPTY_STRING, EMPTY_STRING);
064:            }
065:
066:            /**
067:             * Ctor specifying this objects attributes.
068:             *
069:             * @param	id			Uniquely identifies this object.
070:             * @param	name		Name of thi query.
071:             * @param	description	The description of this alias.
072:             * @param	sql			The SQL to execute.
073:             */
074:            public Query(IIdentifier id, String name, String description,
075:                    String sql) {
076:                super ();
077:                _id = id != null ? id : IdentifierFactory.getInstance()
078:                        .createIdentifier();
079:                _name = getString(name);
080:                _description = getString(description);
081:                _sql = getString(sql);
082:            }
083:
084:            /**
085:             * Two <CODE>Query</CODE> objects are considered equal if their ID's are
086:             * identical unless their ID's are
087:             *
088:             * @return	<CODE>true</CODE> if this object is equal to the passed one.
089:             */
090:            public boolean equals(Object rhs) {
091:                boolean rc = false;
092:                if (rhs != null && rhs.getClass().equals(getClass())) {
093:                    rc = ((Query) rhs).getIdentifier().equals(getIdentifier());
094:                }
095:                return rc;
096:            }
097:
098:            /**
099:             * Return a copy of this object.
100:             */
101:            public Object clone() {
102:                try {
103:                    return super .clone();
104:                } catch (CloneNotSupportedException ex) {
105:                    throw new InternalError(ex.getMessage()); // Impossible.
106:                }
107:            }
108:
109:            public synchronized int hashCode() {
110:                return getIdentifier().hashCode();
111:            }
112:
113:            public String toString() {
114:                return getName();
115:            }
116:
117:            /**
118:             * Returns <CODE>true</CODE> if this object is valid.<P>
119:             * Implementation for <CODE>IPersistable</CODE>.
120:             */
121:            public synchronized boolean isValid() {
122:                return _name.trim().length() > 0 && _sql.trim().length() > 0;
123:            }
124:
125:            public IIdentifier getIdentifier() {
126:                return _id;
127:            }
128:
129:            public String getName() {
130:                return _name;
131:            }
132:
133:            private String getString(String data) {
134:                return data != null ? data.trim() : "";
135:            }
136:        }
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