org.kie.guvnor.guided.rule.client.widget.ActionSetFieldWidget.java Source code

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/*
 * Copyright 2012 JBoss 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 org.kie.guvnor.guided.rule.client.widget;

import com.google.gwt.event.dom.client.ChangeEvent;
import com.google.gwt.event.dom.client.ChangeHandler;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.event.shared.EventBus;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.HorizontalPanel;
import com.google.gwt.user.client.ui.Image;
import com.google.gwt.user.client.ui.ListBox;
import com.google.gwt.user.client.ui.Widget;
import org.drools.guvnor.models.commons.shared.rule.ActionFieldValue;
import org.drools.guvnor.models.commons.shared.rule.ActionInsertFact;
import org.drools.guvnor.models.commons.shared.rule.ActionSetField;
import org.drools.guvnor.models.commons.shared.rule.ActionUpdateField;
import org.kie.guvnor.commons.ui.client.resources.HumanReadable;
import org.kie.guvnor.commons.ui.client.popups.errors.ErrorPopup;
import org.kie.guvnor.datamodel.model.DropDownData;
import org.kie.guvnor.datamodel.model.FieldAccessorsAndMutators;
import org.kie.guvnor.datamodel.oracle.DataModelOracle;
import org.kie.guvnor.guided.rule.client.editor.ActionValueEditor;
import org.kie.guvnor.guided.rule.client.editor.RuleModeller;
import org.kie.guvnor.guided.rule.client.editor.events.TemplateVariablesChangedEvent;
import org.kie.guvnor.guided.rule.client.resources.i18n.Constants;
import org.kie.guvnor.guided.rule.client.resources.images.GuidedRuleEditorImages508;
import org.kie.guvnor.guided.rule.client.util.FieldNatureUtil;
import org.uberfire.client.common.ClickableLabel;
import org.uberfire.client.common.DirtyableFlexTable;
import org.uberfire.client.common.FormStylePopup;
import org.uberfire.client.common.SmallLabel;

/**
 * This widget is for setting fields on a bound fact or global variable.
 */
public class ActionSetFieldWidget extends RuleModellerWidget {

    final private ActionSetField model;
    final private DirtyableFlexTable layout;
    private boolean isBoundFact = false;
    private String[] fieldCompletions;
    private String variableClass;
    private boolean readOnly;

    private boolean isFactTypeKnown;

    public ActionSetFieldWidget(RuleModeller mod, EventBus eventBus, ActionSetField set, Boolean readOnly) {
        super(mod, eventBus);
        this.model = set;
        this.layout = new DirtyableFlexTable();

        layout.setStyleName("model-builderInner-Background");

        DataModelOracle completions = this.getModeller().getSuggestionCompletions();

        if (completions.isGlobalVariable(set.getVariable())) {
            this.fieldCompletions = completions.getFieldCompletionsForGlobalVariable(set.getVariable());
            this.variableClass = completions.getGlobalVariable(set.getVariable());
        } else {
            String type = mod.getModel().getLHSBindingType(set.getVariable());
            if (type != null) {
                this.fieldCompletions = completions.getFieldCompletions(FieldAccessorsAndMutators.MUTATOR, type);
                this.variableClass = type;
                this.isBoundFact = true;
            } else {
                ActionInsertFact patternRhs = mod.getModel().getRHSBoundFact(set.getVariable());
                if (patternRhs != null) {
                    this.fieldCompletions = completions.getFieldCompletions(FieldAccessorsAndMutators.MUTATOR,
                            patternRhs.getFactType());
                    this.variableClass = patternRhs.getFactType();
                    this.isBoundFact = true;
                }
            }
        }

        if (this.variableClass == null) {
            readOnly = true;
            ErrorPopup.showMessage(Constants.INSTANCE.CouldNotFindTheTypeForVariable0(set.getVariable()));
        }

        this.isFactTypeKnown = completions.isFactTypeRecognized(this.variableClass);
        if (readOnly == null) {
            this.readOnly = !this.isFactTypeKnown;
        } else {
            this.readOnly = readOnly;
        }

        if (this.readOnly) {
            layout.addStyleName("editor-disabled-widget");
        }

        doLayout();

        initWidget(this.layout);
    }

    private void doLayout() {
        layout.clear();

        for (int i = 0; i < model.getFieldValues().length; i++) {
            ActionFieldValue val = model.getFieldValues()[i];

            layout.setWidget(i, 0, getSetterLabel());
            layout.setWidget(i, 1, fieldSelector(val));
            layout.setWidget(i, 2, valueEditor(val));
            final int idx = i;
            Image remove = GuidedRuleEditorImages508.INSTANCE.DeleteItemSmall();
            remove.addClickHandler(new ClickHandler() {

                public void onClick(ClickEvent event) {
                    if (Window.confirm(Constants.INSTANCE.RemoveThisItem())) {
                        model.removeField(idx);
                        setModified(true);
                        getModeller().refreshWidget();

                        //Signal possible change in Template variables
                        TemplateVariablesChangedEvent tvce = new TemplateVariablesChangedEvent(
                                getModeller().getModel());
                        getEventBus().fireEventFromSource(tvce, getModeller().getModel());
                    }
                }
            });
            if (!this.readOnly) {
                layout.setWidget(i, 3, remove);
            }

        }

        if (model.getFieldValues().length == 0) {
            HorizontalPanel h = new HorizontalPanel();
            h.add(getSetterLabel());
            if (!this.readOnly) {
                Image image = GuidedRuleEditorImages508.INSTANCE.Edit();
                image.setAltText(Constants.INSTANCE.AddFirstNewField());
                image.setTitle(Constants.INSTANCE.AddFirstNewField());
                image.addClickHandler(new ClickHandler() {

                    public void onClick(ClickEvent sender) {
                        showAddFieldPopup(sender);
                    }
                });
                h.add(image);
            }
            layout.setWidget(0, 0, h);
        }

        //layout.setWidget( 0, 1, inner );

    }

    private Widget getSetterLabel() {

        ClickHandler clk = new ClickHandler() {

            public void onClick(ClickEvent event) {
                //Widget w = (Widget)event.getSource();
                showAddFieldPopup(event);

            }
        };
        String modifyType = "set";
        if (this.model instanceof ActionUpdateField) {
            modifyType = "modify";
        }

        String type = this.getModeller().getModel().getLHSBindingType(model.getVariable());

        String descFact = (type != null) ? type + " <b>[" + model.getVariable() + "]</b>" : model.getVariable();

        String sl = Constants.INSTANCE.setterLabel(HumanReadable.getActionDisplayName(modifyType), descFact);
        return new ClickableLabel(sl, clk, !this.readOnly);//HumanReadable.getActionDisplayName(modifyType) + " value of <b>[" + model.variable + "]</b>", clk);
    }

    protected void showAddFieldPopup(ClickEvent w) {
        final DataModelOracle completions = this.getModeller().getSuggestionCompletions();
        final FormStylePopup popup = new FormStylePopup(GuidedRuleEditorImages508.INSTANCE.Wizard(),
                Constants.INSTANCE.AddAField());

        final ListBox box = new ListBox();
        box.addItem("...");

        for (int i = 0; i < fieldCompletions.length; i++) {
            box.addItem(fieldCompletions[i]);
        }

        box.setSelectedIndex(0);

        popup.addAttribute(Constants.INSTANCE.AddField(), box);
        box.addChangeHandler(new ChangeHandler() {

            public void onChange(ChangeEvent event) {
                String fieldName = box.getItemText(box.getSelectedIndex());

                String fieldType = completions.getFieldType(variableClass, fieldName);
                model.addFieldValue(new ActionFieldValue(fieldName, "", fieldType));
                setModified(true);
                getModeller().refreshWidget();
                popup.hide();
            }
        });

        popup.show();

    }

    private Widget valueEditor(final ActionFieldValue val) {
        DataModelOracle completions = this.getModeller().getSuggestionCompletions();
        String type = "";
        if (completions.isGlobalVariable(this.model.getVariable())) {
            type = completions.getGlobalVariable(this.model.getVariable());
        } else {
            type = this.getModeller().getModel().getLHSBindingType(this.model.getVariable());
            /*
             * to take in account if the using a rhs bound variable
             */
            if (type == null && !this.readOnly) {
                type = this.getModeller().getModel().getRHSBoundFact(this.model.getVariable()).getFactType();
            }
        }

        DropDownData enums = completions.getEnums(type, val.getField(),
                FieldNatureUtil.toMap(this.model.getFieldValues()));
        ActionValueEditor actionValueEditor = new ActionValueEditor(val, enums, this.getModeller(),
                this.getEventBus(), val.getType(), this.readOnly);
        actionValueEditor.setOnChangeCommand(new Command() {

            public void execute() {
                setModified(true);
            }
        });
        return actionValueEditor;
    }

    private Widget fieldSelector(final ActionFieldValue val) {
        return new SmallLabel(val.getField());
    }

    /**
     * This returns true if the values being set are on a fact.
     */
    public boolean isBoundFact() {
        return isBoundFact;
    }

    public boolean isDirty() {
        return layout.hasDirty();
    }

    @Override
    public boolean isReadOnly() {
        return this.readOnly;
    }

    @Override
    public boolean isFactTypeKnown() {
        return this.isFactTypeKnown;
    }

}