Source Code Cross Referenced for ResultSetIterator.java in  » Library » Apache-beehive-1.0.2-src » org » apache » beehive » controls » system » jdbc » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache beehive 1.0.2 src » org.apache.beehive.controls.system.jdbc 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Licensed to the Apache Software Foundation (ASF) under one or more
003:         * contributor license agreements.  See the NOTICE file distributed with
004:         * this work for additional information regarding copyright ownership.
005:         * The ASF licenses this file to You under the Apache License, Version 2.0
006:         * (the "License"); you may not use this file except in compliance with
007:         * the License.  You may obtain a copy of the License at
008:         *
009:         *     http://www.apache.org/licenses/LICENSE-2.0
010:         *
011:         * Unless required by applicable law or agreed to in writing, software
012:         * distributed under the License is distributed on an "AS IS" BASIS,
013:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014:         * See the License for the specific language governing permissions and
015:         * limitations under the License.
016:         *
017:         * $Header:$
018:         */
019:        package org.apache.beehive.controls.system.jdbc;
020:
021:        import org.apache.beehive.controls.api.ControlException;
022:        import org.apache.beehive.controls.api.context.ControlBeanContext;
023:
024:        import java.lang.reflect.Method;
025:        import java.sql.ResultSet;
026:        import java.sql.SQLException;
027:        import java.util.Calendar;
028:        import java.util.NoSuchElementException;
029:
030:        /**
031:         * Used by DefaultIteratorResultSetMapper for mapping a ResultSet to an Iterator type.
032:         */
033:        public class ResultSetIterator implements  java.util.Iterator {
034:
035:            private final Class _returnClass;
036:            private final ResultSet _rs;
037:            private final RowMapper _rowMapper;
038:
039:            private boolean _primed = false;
040:
041:            /**
042:             * Create a new ResultSetIterator.
043:             * @param context A ControlBeanContext.
044:             * @param method The annotated method.
045:             * @param rs The ResultSet to map.
046:             * @param cal A Calendar instance for mapping date/time values.
047:             */
048:            ResultSetIterator(ControlBeanContext context, Method method,
049:                    ResultSet rs, Calendar cal) {
050:                _rs = rs;
051:
052:                JdbcControl.SQL methodSQL = (JdbcControl.SQL) context
053:                        .getMethodPropertySet(method, JdbcControl.SQL.class);
054:                _returnClass = methodSQL.iteratorElementType();
055:
056:                if (_returnClass == null) {
057:                    throw new ControlException(
058:                            "Invalid return class declared for Iterator:"
059:                                    + _returnClass.getName());
060:                }
061:
062:                _rowMapper = RowMapperFactory.getRowMapper(rs, _returnClass,
063:                        cal);
064:            }
065:
066:            /**
067:             * Does this iterater have more elements?
068:             * @return true if there is another element
069:             */
070:            public boolean hasNext() {
071:                if (_primed) {
072:                    return true;
073:                }
074:
075:                try {
076:                    _primed = _rs.next();
077:                } catch (SQLException sqle) {
078:                    return false;
079:                }
080:                return _primed;
081:            }
082:
083:            /**
084:             * Get the next element in the iteration.
085:             * @return The next element in the iteration.
086:             */
087:            public Object next() {
088:                try {
089:                    if (!_primed) {
090:                        _primed = _rs.next();
091:                        if (!_primed) {
092:                            throw new NoSuchElementException();
093:                        }
094:                    }
095:                    // reset upon consumption
096:                    _primed = false;
097:                    return _rowMapper.mapRowToReturnType();
098:                } catch (SQLException e) {
099:                    // Since Iterator interface is locked, all we can do
100:                    // is put the real exception inside an expected one.
101:                    NoSuchElementException xNoSuch = new NoSuchElementException(
102:                            "ResultSet exception: " + e);
103:                    xNoSuch.initCause(e);
104:                    throw xNoSuch;
105:                }
106:            }
107:
108:            /**
109:             * Remove is currently not supported.
110:             */
111:            public void remove() {
112:                throw new UnsupportedOperationException("remove not supported");
113:            }
114:        }
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