Source Code Cross Referenced for OJBIterator.java in  » Database-ORM » db-ojb » org » apache » ojb » broker » accesslayer » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database ORM » db ojb » org.apache.ojb.broker.accesslayer 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        package org.apache.ojb.broker.accesslayer;
02:
03:        /* Copyright 2002-2005 The Apache Software Foundation
04:         *
05:         * Licensed under the Apache License, Version 2.0 (the "License");
06:         * you may not use this file except in compliance with the License.
07:         * You may obtain a copy of the License at
08:         *
09:         *     http://www.apache.org/licenses/LICENSE-2.0
10:         *
11:         * Unless required by applicable law or agreed to in writing, software
12:         * distributed under the License is distributed on an "AS IS" BASIS,
13:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14:         * See the License for the specific language governing permissions and
15:         * limitations under the License.
16:         */
17:
18:        import java.util.Iterator;
19:
20:        import org.apache.ojb.broker.PersistenceBrokerException;
21:
22:        /**
23:         * A {@link Iterator} extension internaly used by OJB to handle query results.
24:         *
25:         * <p>
26:         * NOTE: OJB is very strict in handling <tt>OJBIterator</tt> instances. <tt>OJBIterator</tt> is
27:         * bound very closely to the used {@link org.apache.ojb.broker.PersistenceBroker} instance.
28:         * Thus if you do a
29:         * <br/> - {@link org.apache.ojb.broker.PersistenceBroker#close}
30:         * <br/> - {@link org.apache.ojb.broker.PersistenceBroker#commitTransaction}
31:         * <br/> - {@link org.apache.ojb.broker.PersistenceBroker#abortTransaction}
32:         * <br/>
33:         * call, the current <tt>OJBIterator</tt> instance resources will be cleaned up automatic
34:         * and invalidate current instance.
35:         * </p>
36:         *
37:         * @version $Id: OJBIterator.java,v 1.9.2.2 2005/12/21 22:22:58 tomdz Exp $
38:         */
39:        public interface OJBIterator extends Iterator {
40:            /**
41:             * @return the size of the iterator, aka the number of rows in this iterator.
42:             */
43:            int size() throws PersistenceBrokerException;
44:
45:            /**
46:             * @return the unlimited size of the iterator,
47:             * fullSize() may differ from size() for PagingIterator
48:             */
49:            int fullSize() throws PersistenceBrokerException;
50:
51:            /**
52:             * Moves the cursor to the given row number in the iterator.
53:             * If the row number is positive, the cursor moves to the given row number with
54:             * respect to the beginning of the iterator. The first row is row 1, the second is row 2, and so on.
55:             * @param row the row to move to in this iterator, by absolute number
56:             */
57:            boolean absolute(int row) throws PersistenceBrokerException;
58:
59:            /**
60:             * Moves the cursor a relative number of rows, either positive or negative. Attempting to move beyond the first/last
61:             * row in the iterator positions the cursor before/after the the first/last row. Calling relative(0) is valid,
62:             * but does not change the cursor position.
63:             * @param row the row to move to in this iterator, by relative number
64:             */
65:            boolean relative(int row) throws PersistenceBrokerException;
66:
67:            /**
68:             * Release all internally used Database resources of the iterator.
69:             * Clients must call this methods explicitely if the iterator is not
70:             * exhausted by the client application. If the Iterator is exhauseted
71:             * this method will be called implicitely.
72:             */
73:            public void releaseDbResources();
74:
75:            /**
76:             * Do not fire any PBLifeCycleEvent when reading next item. 
77:             */
78:            public void disableLifeCycleEvents();
79:        }
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