VariablesEditorWidgetViewImpl.java

/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * 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.kie.workbench.common.stunner.bpmn.client.forms.fields.variablesEditor;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;
import javax.enterprise.context.Dependent;
import javax.enterprise.event.Event;
import javax.inject.Inject;

import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.Style;
import com.google.gwt.dom.client.TableCellElement;
import com.google.gwt.dom.client.TableElement;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.HasValue;
import org.gwtbootstrap3.client.ui.Button;
import org.gwtbootstrap3.client.ui.constants.IconType;
import org.jboss.errai.bus.client.api.BusErrorCallback;
import org.jboss.errai.bus.client.api.base.MessageBuilder;
import org.jboss.errai.bus.client.api.messaging.Message;
import org.jboss.errai.common.client.api.RemoteCallback;
import org.jboss.errai.ui.client.widget.ListWidget;
import org.jboss.errai.ui.client.widget.Table;
import org.jboss.errai.ui.shared.api.annotations.DataField;
import org.jboss.errai.ui.shared.api.annotations.EventHandler;
import org.jboss.errai.ui.shared.api.annotations.Templated;
import org.kie.workbench.common.stunner.bpmn.client.forms.fields.i18n.StunnerFormsClientFieldsConstants;
import org.kie.workbench.common.stunner.bpmn.client.forms.fields.model.VariableRow;
import org.kie.workbench.common.stunner.bpmn.client.forms.util.ListBoxValues;
import org.kie.workbench.common.stunner.bpmn.client.forms.util.StringUtils;
import org.kie.workbench.common.stunner.bpmn.service.DataTypesService;
import org.uberfire.workbench.events.NotificationEvent;

@Dependent
@Templated("VariablesEditorWidget.html#widget")
public class VariablesEditorWidgetViewImpl extends Composite implements VariablesEditorWidgetView,
                                                                        HasValue<String> {

    ListBoxValues dataTypeListBoxValues;

    private String sVariables;

    private Presenter presenter;

    @Inject
    @DataField
    protected Button addVarButton;

    @DataField
    private final TableElement table = Document.get().createTableElement();

    @DataField
    protected TableCellElement nameth = Document.get().createTHElement();

    @DataField
    protected TableCellElement datatypeth = Document.get().createTHElement();

    List<String> dataTypes;
    List<String> dataTypeDisplayNames;

    /**
     * The list of variableRows that currently exist.
     */
    @Inject
    @DataField
    @Table(root = "tbody")
    protected ListWidget<VariableRow, VariableListItemWidgetViewImpl> variableRows;

    @Inject
    protected Event<NotificationEvent> notification;

    @Override
    public String getValue() {
        return sVariables;
    }

    @Override
    public void setValue(final String value) {
        setValue(value,
                 false);
    }

    @Override
    public void setValue(final String value,
                         final boolean fireEvents) {
        if (dataTypes == null) {
            getDataTypes(value,
                         fireEvents);
        } else {
            doSetValue(value,
                       fireEvents,
                       false);
        }
    }

    protected void doSetValue(final String value,
                              final boolean fireEvents,
                              final boolean initializeView) {
        String oldValue = sVariables;
        sVariables = value;
        if (initializeView) {
            initView();
        }
        if (fireEvents) {
            ValueChangeEvent.fireIfNotEqual(this,
                                            oldValue,
                                            sVariables);
        }
    }

    protected void setDataTypes(final List<String> dataTypes,
                                final List<String> dataTypeDisplayNames) {
        this.dataTypes = dataTypes;
        this.dataTypeDisplayNames = dataTypeDisplayNames;
        presenter.setDataTypes(dataTypes,
                               dataTypeDisplayNames);
    }

    protected void getDataTypes(final String value,
                                final boolean fireEvents) {
        final List<String> simpleDataTypes = new ArrayList<String>(Arrays.asList("Boolean",
                                                                                 "Float",
                                                                                 "Integer",
                                                                                 "Object",
                                                                                 "String"));
        final List<String> simpleDataTypeDisplayNames = new ArrayList<String>(Arrays.asList("Boolean",
                                                                                            "Float",
                                                                                            "Integer",
                                                                                            "Object",
                                                                                            "String"));
        MessageBuilder.createCall(
                new RemoteCallback<List<String>>() {
                    public void callback(final List<String> serverDataTypes) {
                        List<List<String>> mergedDataTypes = mergeDataTypes(simpleDataTypes,
                                                                            simpleDataTypeDisplayNames,
                                                                            serverDataTypes);
                        setDataTypes(mergedDataTypes.get(0),
                                     mergedDataTypes.get(1));
                        doSetValue(value,
                                   fireEvents,
                                   true);
                    }

                    ;
                },
                new BusErrorCallback() {
                    public boolean error(final Message message,
                                         final Throwable t) {
                        notification.fire(new NotificationEvent(StunnerFormsClientFieldsConstants.INSTANCE.Error_retrieving_datatypes(),
                                                                NotificationEvent.NotificationType.ERROR));
                        setDataTypes(simpleDataTypes,
                                     simpleDataTypeDisplayNames);
                        doSetValue(value,
                                   fireEvents,
                                   true);
                        return false;
                    }
                },
                DataTypesService.class).getDataTypeNames();
    }

    private List<List<String>> mergeDataTypes(final List<String> simpleDataTypes,
                                              final List<String> simpleDataTypeDisplayNames,
                                              final List<String> serverDataTypes) {
        List<List<String>> results = new ArrayList<List<String>>(2);
        List<String> allDataTypes = new ArrayList<String>();
        List<String> allDataTypeDisplayNames = new ArrayList<String>();
        allDataTypes.addAll(simpleDataTypes);
        allDataTypeDisplayNames.addAll(simpleDataTypeDisplayNames);

        // Create sorted map with DataTypeDisplayNames as the keys
        Map<String, String> mapServerDataTypeDisplayNames = new TreeMap<String, String>();
        for (String serverDataType : serverDataTypes) {
            mapServerDataTypeDisplayNames.put(StringUtils.createDataTypeDisplayName(serverDataType),
                                              serverDataType);
        }

        // Add DataTypes in order sorted by DataTypeDisplayNames
        for (Map.Entry<String, String> entry : mapServerDataTypeDisplayNames.entrySet()) {
            allDataTypes.add(entry.getValue());
            allDataTypeDisplayNames.add(entry.getKey());
        }

        results.add(allDataTypes);
        results.add(allDataTypeDisplayNames);

        return results;
    }

    @Override
    public void doSave() {
        String newValue = presenter.serializeVariables(getVariableRows());
        setValue(newValue,
                 true);
    }

    protected void initView() {
        List<VariableRow> arrVariableRows = presenter.deserializeVariables(sVariables);
        setVariableRows(arrVariableRows);
    }

    @Override
    public HandlerRegistration addValueChangeHandler(final ValueChangeHandler<String> handler) {
        return addHandler(handler,
                          ValueChangeEvent.getType());
    }

    /**
     * Tests whether a VariableRow name occurs more than once in the list of rows
     * @param name
     * @return
     */
    public boolean isDuplicateName(final String name) {
        return presenter.isDuplicateName(name);
    }

    @Override
    public void init(final Presenter presenter) {
        this.presenter = presenter;
        addVarButton.setIcon(IconType.PLUS);
        nameth.setInnerText("Name");
        datatypeth.setInnerText("Data Type");
    }

    @Override
    public int getVariableRowsCount() {
        return variableRows.getValue().size();
    }

    @Override
    public void setTableDisplayStyle() {
        table.getStyle().setDisplay(Style.Display.TABLE);
    }

    @Override
    public void setNoneDisplayStyle() {
        table.getStyle().setDisplay(Style.Display.NONE);
    }

    @Override
    public void setVariableRows(final List<VariableRow> rows) {
        variableRows.setValue(rows);
        for (int i = 0; i < getVariableRowsCount(); i++) {
            VariableListItemWidgetView widget = getVariableWidget(i);
            widget.setDataTypes(dataTypeListBoxValues);
            widget.setParentWidget(presenter);
        }
    }

    @Override
    public List<VariableRow> getVariableRows() {
        return variableRows.getValue();
    }

    @Override
    public VariableListItemWidgetView getVariableWidget(final int index) {
        return variableRows.getComponent(index);
    }

    public void setVariablesDataTypes(final ListBoxValues dataTypeListBoxValues) {
        this.dataTypeListBoxValues = dataTypeListBoxValues;
        for (int i = 0; i < getVariableRowsCount(); i++) {
            getVariableWidget(i).setDataTypes(dataTypeListBoxValues);
        }
    }

    @EventHandler("addVarButton")
    public void handleAddVarButton(final ClickEvent e) {
        presenter.addVariable();
    }

    public void removeVariable(final VariableRow variableRow) {
        presenter.removeVariable(variableRow);
        if (getVariableRows().isEmpty()) {
            setNoneDisplayStyle();
        }
    }
}