Source Code Cross Referenced for JDBCQlQueryMetaData.java in  » EJB-Server-JBoss-4.2.1 » server » org » jboss » ejb » plugins » cmp » jdbc » metadata » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » EJB Server JBoss 4.2.1 » server » org.jboss.ejb.plugins.cmp.jdbc.metadata 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * JBoss, Home of Professional Open Source.
003:         * Copyright 2006, Red Hat Middleware LLC, and individual contributors
004:         * as indicated by the @author tags. See the copyright.txt file in the
005:         * distribution for a full listing of individual contributors.
006:         *
007:         * This is free software; you can redistribute it and/or modify it
008:         * under the terms of the GNU Lesser General Public License as
009:         * published by the Free Software Foundation; either version 2.1 of
010:         * the License, or (at your option) any later version.
011:         *
012:         * This software 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 GNU
015:         * Lesser General Public License for more details.
016:         *
017:         * You should have received a copy of the GNU Lesser General Public
018:         * License along with this software; if not, write to the Free
019:         * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
021:         */
022:        package org.jboss.ejb.plugins.cmp.jdbc.metadata;
023:
024:        import java.lang.reflect.Method;
025:
026:        import org.jboss.metadata.QueryMetaData;
027:
028:        /**
029:         * Immutable class which contains information about an EJB QL query.
030:         *
031:         * @author <a href="mailto:dain@daingroup.com">Dain Sundstrom</a>
032:         * @version $Revision: 57209 $
033:         */
034:        public final class JDBCQlQueryMetaData implements  JDBCQueryMetaData {
035:            /**
036:             * The method to which this query is bound.
037:             */
038:            private final Method method;
039:
040:            /**
041:             * The ejb-ql fro the query.
042:             */
043:            private final String ejbQl;
044:
045:            /**
046:             * Should the query return Local or Remote beans.
047:             */
048:            private final boolean resultTypeMappingLocal;
049:
050:            /**
051:             * Read ahead meta data.
052:             */
053:            private final JDBCReadAheadMetaData readAhead;
054:
055:            private final Class compiler;
056:
057:            private final boolean lazyResultSetLoading;
058:
059:            /**
060:             * Constructs a JDBCQlQueryMetaData which is defined by the queryMetaData
061:             * and is invoked by the specified method.
062:             *
063:             * @param queryMetaData the metadata about this query which was loaded
064:             *                      from the ejb-jar.xml file
065:             * @param method        the method which invokes this query
066:             */
067:            public JDBCQlQueryMetaData(QueryMetaData queryMetaData,
068:                    Method method, Class qlCompiler,
069:                    boolean lazyResultSetLoading) {
070:                this .method = method;
071:                this .readAhead = JDBCReadAheadMetaData.DEFAULT;
072:                ejbQl = queryMetaData.getEjbQl();
073:                resultTypeMappingLocal = (queryMetaData.getResultTypeMapping() == QueryMetaData.LOCAL);
074:
075:                compiler = qlCompiler;
076:                this .lazyResultSetLoading = lazyResultSetLoading;
077:            }
078:
079:            /**
080:             * Constructs a JDBCQlQueryMetaData with data from the jdbcQueryMetaData
081:             * and additional data from the xml element
082:             */
083:            public JDBCQlQueryMetaData(JDBCQlQueryMetaData defaults,
084:                    JDBCReadAheadMetaData readAhead, Class compiler,
085:                    boolean lazyResultSetLoading) {
086:                this .method = defaults.getMethod();
087:                this .readAhead = readAhead;
088:                this .ejbQl = defaults.getEjbQl();
089:                this .resultTypeMappingLocal = defaults.resultTypeMappingLocal;
090:                this .compiler = compiler;
091:                this .lazyResultSetLoading = lazyResultSetLoading;
092:            }
093:
094:            /**
095:             * Constructs a JDBCQlQueryMetaData with data from the jdbcQueryMetaData
096:             * and additional data from the xml element
097:             */
098:            public JDBCQlQueryMetaData(JDBCQlQueryMetaData jdbcQueryMetaData,
099:                    Method method, JDBCReadAheadMetaData readAhead) {
100:                this .method = method;
101:                this .readAhead = readAhead;
102:                ejbQl = jdbcQueryMetaData.getEjbQl();
103:                resultTypeMappingLocal = jdbcQueryMetaData.resultTypeMappingLocal;
104:                compiler = jdbcQueryMetaData.compiler;
105:                lazyResultSetLoading = jdbcQueryMetaData.lazyResultSetLoading;
106:            }
107:
108:            // javadoc in parent class
109:            public Method getMethod() {
110:                return method;
111:            }
112:
113:            public Class getQLCompilerClass() {
114:                return compiler;
115:            }
116:
117:            /**
118:             * Gets the EJB QL query which will be invoked.
119:             *
120:             * @return the ejb ql String for this query
121:             */
122:            public String getEjbQl() {
123:                return ejbQl;
124:            }
125:
126:            // javadoc in parent class
127:            public boolean isResultTypeMappingLocal() {
128:                return resultTypeMappingLocal;
129:            }
130:
131:            /**
132:             * Gets the read ahead metadata for the query.
133:             *
134:             * @return the read ahead metadata for the query.
135:             */
136:            public JDBCReadAheadMetaData getReadAhead() {
137:                return readAhead;
138:            }
139:
140:            public boolean isLazyResultSetLoading() {
141:                return lazyResultSetLoading;
142:            }
143:
144:            /**
145:             * Compares this JDBCQlQueryMetaData against the specified object. Returns
146:             * true if the objects are the same. Two JDBCQlQueryMetaData are the same
147:             * if they are both invoked by the same method.
148:             *
149:             * @param o the reference object with which to compare
150:             * @return true if this object is the same as the object argument;
151:             *         false otherwise
152:             */
153:            public boolean equals(Object o) {
154:                if (o instanceof  JDBCQlQueryMetaData) {
155:                    return ((JDBCQlQueryMetaData) o).method.equals(method);
156:                }
157:                return false;
158:            }
159:
160:            /**
161:             * Returns a hashcode for this JDBCQlQueryMetaData. The hashcode is computed
162:             * by the method which invokes this query.
163:             *
164:             * @return a hash code value for this object
165:             */
166:            public int hashCode() {
167:                return method.hashCode();
168:            }
169:
170:            /**
171:             * Returns a string describing this JDBCQlQueryMetaData. The exact details
172:             * of the representation are unspecified and subject to change, but the
173:             * following may be regarded as typical:
174:             * <p/>
175:             * "[JDBCQlQueryMetaData: method=public org.foo.User
176:             * findByName(java.lang.String)]"
177:             *
178:             * @return a string representation of the object
179:             */
180:            public String toString() {
181:                return "[JDBCQlQueryMetaData : method=" + method + "]";
182:            }
183:        }
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