Source Code Cross Referenced for GridDataSource.java in  » Web-Framework » Tapestry » org » apache » tapestry » grid » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Framework » Tapestry » org.apache.tapestry.grid 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        // Copyright 2007 The Apache Software Foundation
02:        //
03:        // Licensed under the Apache License, Version 2.0 (the "License");
04:        // you may not use this file except in compliance with the License.
05:        // You may obtain a copy of the License at
06:        //
07:        //     http://www.apache.org/licenses/LICENSE-2.0
08:        //
09:        // Unless required by applicable law or agreed to in writing, software
10:        // distributed under the License is distributed on an "AS IS" BASIS,
11:        // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12:        // See the License for the specific language governing permissions and
13:        // limitations under the License.
14:
15:        package org.apache.tapestry.grid;
16:
17:        import org.apache.tapestry.beaneditor.PropertyModel;
18:        import org.apache.tapestry.corelib.components.Grid;
19:
20:        /**
21:         * Defines how a {@link Grid} components (and its sub-components) gain access to the row data that
22:         * is displayed on the page. In many cases, this is just a wrapper around a simple List, but the
23:         * abstractions exist to support access to a large data set that is accessible in sections.
24:         */
25:        public interface GridDataSource {
26:            /** Returns the number of rows available in the data source. */
27:            int getAvailableRows();
28:
29:            /**
30:             * Invoked to allow the source to prepare to present values. This gives the source a chance to
31:             * pre-fetch data (when appropriate) and informs the source of the desired sort order.
32:             * 
33:             * @param startIndex
34:             *            the starting index to be retrieved
35:             * @param endIndex
36:             *            the ending index to be retrieved
37:             * @param sortModel
38:             *            the property model that defines what data will be used for sorting, or null if no
39:             *            sorting is required (in which case, whatever natural order is provided by the
40:             *            underlying data source will be used)
41:             * @param ascending
42:             *            if true, then sort ascending, else decending
43:             */
44:            void prepare(int startIndex, int endIndex, PropertyModel sortModel,
45:                    boolean ascending);
46:
47:            /** Returns the row value at the provided index. This method will be invoked in sequential order. */
48:            Object getRowValue(int index);
49:
50:            /**
51:             * Returns the type of value in the rows, or null if not known. This value is used to create a
52:             * default {@link GridDataModel} when no such model is provided.
53:             * 
54:             * @return the row type, or null
55:             */
56:            Class getRowType();
57:        }
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