litesoft
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/* * Copyright 2008 Google Inc. * * Licensed under the Apache License, Version 2.0 (the "License"); you may not * use this file except in compliance with the License. You may obtain a copy of * the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations under * the License. */ package com.google.gwt.gen2.table.client; import java.util.*; import com.google.gwt.gen2.table.client.TableModelHelper.*; /** * A {@link MutableTableModel} used when the data source can be accessed * synchronously. */ public abstract class ClientTableModel extends MutableTableModel<List<Object>> { /** * Convenience class to support custom iterators. */ private abstract static class StubIterator<E> implements Iterator<E> { int index; E next; boolean done = false; protected abstract E computeNext(); public boolean hasNext() { if ( done ) { return false; } if ( next == null ) { next = computeNext(); if ( next == null ) { done = true; return false; } } return true; } public E next() { if ( !hasNext() ) { throw new NoSuchElementException(); } else { E accum = next; next = null; return accum; } } public void remove() { throw new UnsupportedOperationException(); } } private class ColumnIterator extends StubIterator<Object> { private int row = 0; @Override public Object computeNext() { return getCell( row, index++ ); } } /** * An iterator over the rows of of client data. */ private class RowIterator extends StubIterator<List<Object>> { private int max; public RowIterator( Request request ) { index = request.getStartRow(); if ( request.getNumRows() == -1 ) { max = Integer.MAX_VALUE; } else { max = request.getNumRows() + index; } } @Override protected List<Object> computeNext() { // Reset column iterator rather than creating new one. final ColumnIterator colIt = new ColumnIterator(); colIt.index = 0; colIt.row = index++; colIt.done = false; colIt.next = null; // Now check for next. if ( colIt.hasNext() && colIt.row < max ) { List<Object> next = new ArrayList<Object>(); while ( colIt.hasNext() ) { next.add( colIt.next() ); } return next; } else { return null; } } } /** * Get the value for a given cell. Return null if no more values are * available. * * @param rowNum the row index * @param colNum the column index * * @return the value at the given row and column */ public abstract Object getCell( int rowNum, int colNum ); @Override public void requestRows( Request request, Callback<List<Object>> callback ) { final RowIterator rowIter = new RowIterator( request ); Response<List<Object>> response = new Response<List<Object>>() { @Override public Iterator<List<Object>> getRowValues() { return rowIter; } }; callback.onRowsReady( request, response ); } } |