org.primefaces.component.datatable.feature.SelectionFeature Maven / Gradle / Ivy

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PrimeFaces is one of the most popular UI libraries in Java EE Ecosystem and widely used by software companies, world renowned brands, banks, financial institutions, insurance companies, universities and more.

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/**
 * Copyright 2009-2018 PrimeTek.
 *
 * 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.primefaces.component.datatable.feature;

import java.io.IOException;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import javax.el.ValueExpression;
import javax.faces.FacesException;
import javax.faces.context.FacesContext;

import org.primefaces.component.datatable.DataTable;
import org.primefaces.component.datatable.DataTableRenderer;
import org.primefaces.component.datatable.TableState;
import org.primefaces.util.ComponentUtils;

public class SelectionFeature implements DataTableFeature {

    private final static String ALL_SELECTOR = "@all";

    public void decode(FacesContext context, DataTable table) {
        String clientId = table.getClientId(context);
        Map params = context.getExternalContext().getRequestParameterMap();
        String selection = params.get(clientId + "_selection");
        Object originalValue = table.getValue();
        Object filteredValue = table.getFilteredValue();
        boolean isFiltered = (filteredValue != null);

        if (isFiltered) {
            table.setValue(null);
        }

        if (table.isSingleSelectionMode()) {
            decodeSingleSelection(table, selection);
        }
        else {
            decodeMultipleSelection(context, table, selection);
        }

        if (isFiltered) {
            table.setValue(originalValue);
        }

        if (table.isMultiViewState()) {
            TableState ts = table.getTableState(true);
            table.findSelectedRowKeys();
            ts.setRowKeys(table.getSelectedRowKeys());
        }
    }

    void decodeSingleSelection(DataTable table, String selection) {
        if (ComponentUtils.isValueBlank(selection)) {
            table.setSelection(null);
        }
        else {
            table.setSelection(table.getRowData(selection));
        }
    }

    void decodeMultipleSelection(FacesContext context, DataTable table, String selection) {
        ValueExpression selectionByVE = table.getValueExpression(DataTable.PropertyKeys.selection.toString());
        Class clazz = selectionByVE == null ? null : selectionByVE.getType(context.getELContext());
        boolean isArray = clazz == null ? false : clazz.isArray();

        if (clazz != null && !isArray && !List.class.isAssignableFrom(clazz)) {
            throw new FacesException("Multiple selection reference must be an Array or a List for datatable " + table.getClientId());
        }

        if (ComponentUtils.isValueBlank(selection)) {
            if (isArray) {
                table.setSelection(Array.newInstance(clazz.getComponentType(), 0));
            }
            else {
                table.setSelection(new ArrayList