/* * Copyright 2004 original author or authors. * * 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 org.extremecomponents.base;import java.util.Collection;import java.util.HashMap;import java.util.Map;import javax.servlet.jsp.PageContext;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.extremecomponents.table.cell.Cell;import org.extremecomponents.table.core.AutoGenerateColumns;import org.extremecomponents.table.core.ParameterRegistry;import org.extremecomponents.table.handler.ColumnHandler;import org.extremecomponents.table.handler.ExportHandler;import org.extremecomponents.table.handler.FilterHandler;import org.extremecomponents.table.handler.FormHandler;import org.extremecomponents.table.handler.PaginationHandler;import org.extremecomponents.table.handler.TableHandler;/** * org.extremecomponents.core.model.BaseModel.java - *  * @author phorn */public abstract class BaseModel {    private static Log logger = LogFactory.getLog(BaseModel.class);    private PageContext pageContext;    private ParameterRegistry registry = new ParameterRegistry(this);    private ExportHandler exportHandler = new ExportHandler(this);    private FilterHandler filterHandler = new FilterHandler(this);    private PaginationHandler pageHandler = new PaginationHandler(this);    private FormHandler formHandler = new FormHandler();    private ColumnHandler columnHandler = new ColumnHandler(this);    private TableHandler tableHandler = new TableHandler(this);    //cache out some objects    private Map cellCache = new HashMap();    private Map callbacks = new HashMap();        //cache this out    AutoGenerateColumns autoGenerateColumns;    public BaseModel(PageContext pageContext) {        this.pageContext = pageContext;    }    /**     * Access to the Servlet pageContext()     */    public PageContext getPageContext() {        return pageContext;    }    /**     * A simple implementation of a cache for the Cell definitions.     */    public Cell getCachedCell(Class classDefinition) {        Cell cell = (Cell) cellCache.get(classDefinition);        if (cell == null) {            try {                Object object = classDefinition.newInstance();                cell = (Cell) object;                cellCache.put(classDefinition, cell);                if (logger.isDebugEnabled()) {                    logger.debug("Cache the Cell [" + classDefinition + "]");                }            } catch (Exception e) {                logger.error("Model.build()", e);            }        }        return cell;    }    /**     * Return the proper callback. The trick here is that could return the same     * class for different callbacks. This is a feature so that do not have to     * make different classes for each individual callback.     */    public Object getCallback(String callbackClassName)            throws Exception {        Object result = callbacks.get(callbackClassName);        if (result != null) {            return result;        }        Class classDefinition = Class.forName(callbackClassName);        result = classDefinition.newInstance();        callbacks.put(callbackClassName, result);        return result;    }    public Map getCellCache() {        return cellCache;    }    public ParameterRegistry getRegistry() {        return registry;    }    public ColumnHandler getColumnHandler() {        return columnHandler;    }    public TableHandler getTableHandler() {        return tableHandler;    }    public ExportHandler getExportHandler() {        return exportHandler;    }    public FilterHandler getFilterHandler() {        return filterHandler;    }    public PaginationHandler getPaginationHandler() {        return pageHandler;    }    public FormHandler getFormHandler() {        return formHandler;    }    public AutoGenerateColumns getAutoGenerateColumns() {        return autoGenerateColumns;    }    public void setAutoGenerateColumns(AutoGenerateColumns autoGenerateColumns) {        this.autoGenerateColumns = autoGenerateColumns;    }    public void destroy() {        exportHandler.destroy();        exportHandler = null;        filterHandler.destroy();        filterHandler = null;        formHandler.destroy();        formHandler = null;        columnHandler.destroy();        columnHandler = null;        tableHandler.destroy();        tableHandler = null;        autoGenerateColumns = null;    }    public abstract Collection execute()            throws Exception;    public abstract BaseSortHandler getSortHandler();    public abstract BaseViewHandler getViewHandler();    public abstract BaseProperties getProperties();    public abstract BaseResourceBundle getResourceBundle();}