Use generated Util class to get the RPC Async interface.

[online-glom:gwt-glom.git] / src / main / java / org / glom / web / server / LibGlomServiceImpl.java

package org.glom.web.server;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import org.glom.libglom.Document;
import org.glom.libglom.ExampleRowVector;
import org.glom.libglom.Field;
import org.glom.libglom.FieldVector;
import org.glom.libglom.Glom;
import org.glom.libglom.LayoutGroupVector;
import org.glom.libglom.LayoutItem;
import org.glom.libglom.LayoutItemVector;
import org.glom.libglom.RowDataVector;
import org.glom.libglom.StringVector;
import org.glom.web.client.GlomDocument;
import org.glom.web.client.GlomTable;
import org.glom.web.client.LibGlomService;

import com.google.gwt.user.server.rpc.RemoteServiceServlet;

@SuppressWarnings("serial")
public class LibGlomServiceImpl extends RemoteServiceServlet implements LibGlomService {
        private Document document;

        public LibGlomServiceImpl() {
                Glom.libglom_init();
                // FIXME Need to call Glom.libglom_deinit()
                document = new Document();
                document.set_file_uri("file://" + Glom.GLOM_EXAMPLE_FILE_DIR + File.separator + "example_music_collection.glom");
                int error = 0;
                @SuppressWarnings("unused")
                boolean retval = document.load(error);
                // FIXME handle error condition
        }

        /*
         * FIXME I think Swig is generating long on 64-bit machines and int on
         * 32-bit machines - need to keep this constant
         * http://stackoverflow.com/questions/1590831/safely-casting-long-to-int-in-java
         */
        public static int safeLongToInt(long l) {
                if (l < Integer.MIN_VALUE || l > Integer.MAX_VALUE) {
                        throw new IllegalArgumentException(l + " cannot be cast to int without changing its value.");
                }
                return (int) l;
        }

        public GlomDocument getGlomDocument() {
                GlomDocument glomDocument = new GlomDocument();

                // set visible title
                glomDocument.setTitle(document.get_database_title());

                // set array of GlomTables and the default table index
                StringVector tableNames = document.get_table_names();
                GlomTable[] tables = new GlomTable[safeLongToInt(tableNames.size())];
                for (int i = 0; i < tableNames.size(); i++) {
                        String tableName = tableNames.get(i);
                        GlomTable glomTable = new GlomTable();
                        glomTable.setName(tableName);
                        glomTable.setTitle(document.get_table_title(tableName));
                        tables[i] = glomTable;
                        if (tableName.equals(document.get_default_table())) {
                                glomDocument.setDefaultTableIndex(i);
                        }
                }
                glomDocument.setTables(tables);
                return glomDocument;

        }

        public String[] getLayoutListHeaders(String table) {
                LayoutGroupVector layoutList = document.get_data_layout_groups("list", table);
                LayoutItemVector layoutItems = layoutList.get(0).get_items();
                String[] headers = new String[safeLongToInt(layoutItems.size())];
                for (int i = 0; i < layoutItems.size(); i++) {
                        headers[i] = layoutItems.get(i).get_title_or_name();
                }
                return headers;
        }

        /*
         * This is a big hack just get the Layout List widget working. Next steps
         * will be adding the example data to a db so that it can be queried from it
         * rather than from the example data API as I'm doing now.
         */
        public List<String[]> getTableData(int start, int length, String table) {
                LayoutGroupVector layoutList = document.get_data_layout_groups("list", table);
                LayoutItemVector layoutItems = layoutList.get(0).get_items();
                ExampleRowVector rows = document.get_table_example_data(table);

                /*
                 * deal with the case when the requested number of rows is larger than
                 * the number of rows in the data
                 */
                int displayLength = Math.min(safeLongToInt(rows.size()), length);

                List<String[]> rowsList = new ArrayList<String[]>(displayLength);
                for (int i = start; i < displayLength; i++) {
                        RowDataVector row = rows.get(i);

                        String[] rowArray = new String[safeLongToInt(layoutItems.size())];
                        for (int j = 0; j < layoutItems.size(); j++) {
                                LayoutItem layoutItem = layoutItems.get(j);
                                String fieldName = layoutItem.get_layout_display_name();
                                if (fieldName.contains("::")) {
                                        // implement this when querying data from a db
                                        rowArray[j] = "Not Implemented";
                                } else {

                                        /*
                                         * need to find the field that the layoutItem is referring
                                         * to so we can put the example data in the layout list
                                         * order
                                         */
                                        FieldVector fields = document.get_table_fields(table);
                                        Field field = null;
                                        int k = 0;
                                        for (; k < fields.size(); k++) {
                                                field = fields.get(k);
                                                if (fieldName.equals(field.get_name()))
                                                        break;
                                        }
                                        rowArray[j] = Glom.get_text_for_gda_value(field.get_glom_type(), row.get(k));
                                }
                        }
                        rowsList.add(rowArray);
                }
                return rowsList;

        }

}