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// This Source Code is in the Public Domain per: http://unlicense.org package org.litesoft.GWT.client.widgets.datatables; import java.util.*; import org.litesoft.GWT.client.*; import org.litesoft.bo.views.*; import org.litesoft.core.util.*; import com.google.gwt.gen2.table.client.TableModelHelper.*; public class DeferredListTableModel<RowType extends IViewObject> extends ListTableModel<RowType> implements FetchRowsDataProviderCallBack<RowType> { private VoDataProvider<RowType> mDataProvider; public DeferredListTableModel( VoDataProvider<RowType> pDataProvider ) { mDataProvider = pDataProvider; } @Override public void success( ImmutableArrayList<RowType> pRows ) { requestResponse( pRows ); } @Override public void tooMany( long pCount ) { AlertManager.alert( this.getClass().getName(), "Too Many Rows", "" + pCount + " is Too Many Rows" ); requestResponse( null ); } @Override public void error( String pError ) { AlertManager.alert( this.getClass().getName(), "Error Fetching Data", pError + "\noccured when attempting to fetch the table data" ); requestResponse( null ); } protected void requestResponse( ArrayList<RowType> pList ) { if ( pList != null ) // Stupid Generics will not let me use a ?: { Collections.sort( mNewList = new ArrayList<RowType>( pList ) ); } else { mNewList = Collections.emptyList(); } updateTable(); } protected void updateTable() { if ( (mNewList != null) && (mAsyncPending != null) ) { clear(); addAll( mNewList ); mNewList = null; updateRowCount(); super.requestRows( mAsyncPending.getRequest(), mAsyncPending.getCallback() ); mAsyncPending = null; } } private List<RowType> mNewList = null; private AsyncPending<RowType> mAsyncPending = null; @Override public void requestRows( Request pRequest, Callback<RowType> pCallback ) { mAsyncPending = new AsyncPending<RowType>( pRequest, pCallback ); if ( mDataProvider != null ) { mDataProvider.requestAllRows( this ); } else { updateTable(); } } private static class AsyncPending<RowType> { private Request mRequest; private Callback<RowType> mCallback; private AsyncPending( Request pRequest, Callback<RowType> pCallback ) { mRequest = pRequest; mCallback = pCallback; } public Request getRequest() { return mRequest; } public Callback<RowType> getCallback() { return mCallback; } } } |