ActionFieldValueEditor.java

/*
 * Copyright 2014 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.drools.workbench.screens.guided.dtree.client.widget.popups;

import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Style;
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.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.uibinder.client.UiHandler;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.SimplePanel;
import com.google.gwt.user.client.ui.Widget;
import org.drools.workbench.models.datamodel.oracle.DataType;
import org.drools.workbench.models.datamodel.oracle.ModelField;
import org.drools.workbench.models.guided.dtree.shared.model.nodes.ActionFieldValue;
import org.drools.workbench.screens.guided.dtree.client.resources.i18n.GuidedDecisionTreeConstants;
import org.drools.workbench.screens.guided.dtree.client.widget.utils.ValueUtilities;
import org.gwtbootstrap3.client.ui.Button;
import org.gwtbootstrap3.client.ui.FormGroup;
import org.gwtbootstrap3.client.ui.ListBox;
import org.kie.workbench.common.widgets.client.datamodel.AsyncPackageDataModelOracle;
import org.uberfire.client.callbacks.Callback;
import org.uberfire.mvp.ParameterizedCommand;

public class ActionFieldValueEditor extends Composite {

    interface ActionFieldValueEditorBinder
            extends
            UiBinder<Widget, ActionFieldValueEditor> {

    }

    private static ActionFieldValueEditorBinder uiBinder = GWT.create( ActionFieldValueEditorBinder.class );

    private final String className;
    private final ActionFieldValue afv;
    private final List<ActionFieldValue> afvs;
    private final AsyncPackageDataModelOracle oracle;
    private final ParameterizedCommand<ActionFieldValue> onDeleteCallback;

    private final ValueEditorFactory valueEditorFactory = new ValueEditorFactory() {
        @Override
        protected Map<String, String> getCurrentValueMap() {
            if ( afvs == null ) {
                return Collections.EMPTY_MAP;
            }
            final Map<String, String> currentValueMap = new HashMap<String, String>();
            for ( ActionFieldValue afv : afvs ) {
                currentValueMap.put( afv.getFieldName(),
                                     ValueUtilities.convertNodeValue( afv.getValue() ) );
            }
            return currentValueMap;
        }
    };

    @UiField
    ListBox fieldListBox;

    @UiField
    FormGroup valueHolder;

    @UiField
    Button removeFieldValueButton;

    public ActionFieldValueEditor( final String className,
                                   final ActionFieldValue afv,
                                   final List<ActionFieldValue> afvs,
                                   final AsyncPackageDataModelOracle oracle,
                                   final ParameterizedCommand<ActionFieldValue> onDeleteCallback ) {
        initWidget( uiBinder.createAndBindUi( this ) );

        this.className = className;
        this.afv = afv;
        this.afvs = afvs;
        this.oracle = oracle;
        this.onDeleteCallback = onDeleteCallback;

        initializeFieldNames( afv );
    }

    private void initializeFieldNames( final ActionFieldValue afv ) {
        fieldListBox.clear();
        fieldListBox.setEnabled( false );

        oracle.getFieldCompletions( className,
                                    new Callback<ModelField[]>() {
                                        @Override
                                        public void callback( final ModelField[] modelFields ) {
                                            fieldListBox.setEnabled( modelFields.length > 0 );
                                            if ( modelFields.length == 0 ) {
                                                fieldListBox.addItem( GuidedDecisionTreeConstants.INSTANCE.noFields() );
                                                return;
                                            }

                                            //Add them to the ListBox
                                            int selectedIndex = -1;
                                            for ( ModelField modelField : modelFields ) {
                                                final String fieldName = modelField.getName();
                                                if ( !fieldName.equals( DataType.TYPE_THIS ) ) {
                                                    fieldListBox.addItem( fieldName );
                                                    if ( afv.getFieldName().equals( fieldName ) ) {
                                                        selectedIndex = fieldListBox.getItemCount() - 1;
                                                    }
                                                }

                                            }

                                            fieldListBox.addChangeHandler( new ChangeHandler() {
                                                @Override
                                                public void onChange( final ChangeEvent event ) {
                                                    final String fieldName = fieldListBox.getItemText( fieldListBox.getSelectedIndex() );
                                                    afv.setFieldName( fieldName );
                                                    afv.setValue( null );
                                                    initialiseValue();
                                                }
                                            } );

                                            fieldListBox.setSelectedIndex( selectedIndex );
                                            if ( selectedIndex == -1 ) {
                                                fieldListBox.setSelectedIndex( 0 );
                                                final String fieldName = fieldListBox.getItemText( 0 );
                                                afv.setFieldName( fieldName );
                                            }
                                            initialiseValue();
                                        }
                                    } );
    }

    private void initialiseValue() {
        final Widget editor = valueEditorFactory.getValueEditor( className,
                                                                 afv.getFieldName(),
                                                                 afv,
                                                                 oracle,
                                                                 false );
        valueHolder.clear();
        if ( editor != null ) {
            valueHolder.add( editor );
        }
    }

    @UiHandler("removeFieldValueButton")
    void onRemoveFieldValueButtonClick( final ClickEvent event ) {
        onDeleteCallback.execute( afv );
    }

}