org.drools.guvnor.client.factmodel.AnnotationEditorPopup.java Source code

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Here is the source code for org.drools.guvnor.client.factmodel.AnnotationEditorPopup.java

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/*
 * Copyright 2010 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.drools.guvnor.client.factmodel;

import java.util.Collection;
import java.util.List;

import org.drools.guvnor.client.common.FormStylePopup;
import org.drools.guvnor.client.messages.Constants;

import com.google.gwt.core.client.GWT;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.Command;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.Grid;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.TextBox;
import com.google.gwt.user.client.ui.VerticalPanel;

/**
 * A pop-up editor for a single Fact annotation
 */
public class AnnotationEditorPopup {

    private static Constants constants = ((Constants) GWT.create(Constants.class));

    private final AnnotationMetaModel annotation;
    private final List<AnnotationMetaModel> annotations;

    private final TextBox txtName = new TextBox();
    private final TextBox txtKey = new TextBox();
    private final TextBox txtValue = new TextBox();

    private Command okCommand;

    public AnnotationEditorPopup(List<AnnotationMetaModel> annotations) {
        this(new AnnotationMetaModel(), annotations);
    }

    public AnnotationEditorPopup(AnnotationMetaModel annotation, List<AnnotationMetaModel> annotations) {
        this.annotation = annotation;
        this.annotations = annotations;
    }

    public AnnotationMetaModel getAnnotation() {
        return annotation;
    }

    public void setOkCommand(Command okCommand) {
        this.okCommand = okCommand;
    }

    public void show() {

        final FormStylePopup pop = new FormStylePopup();

        VerticalPanel vp = new VerticalPanel();

        Grid g = new Grid(2, 3);

        txtName.addKeyPressHandler(new NoSpaceKeyPressHandler());
        txtKey.addKeyPressHandler(new NoSpaceKeyPressHandler());
        g.setWidget(0, 0, new HTML("<b>Name</b>"));
        g.setWidget(1, 0, txtName);

        g.setWidget(0, 1, new HTML("<b>Key</b>"));
        g.setWidget(1, 1, txtKey);

        g.setWidget(0, 2, new HTML("<b>Value</b>"));
        g.setWidget(1, 2, txtValue);

        setControlValues(annotation);

        Button btnOK = new Button(constants.OK());

        btnOK.addClickHandler(new ClickHandler() {

            public void onClick(ClickEvent event) {
                if (doesTheNameExist()) {
                    Window.alert(constants.NameTakenForModel(txtName.getText()));
                    return;
                }

                if (annotationAlreadyHasAName() && annotationNameHasChanged()) {
                    if (isTheUserSureHeWantsToChangeTheName()) {
                        setNameAndClose();
                    }
                } else {
                    setNameAndClose();
                }
            }

            private boolean annotationAlreadyHasAName() {
                return annotation.name != null && annotation.name.length() > 0;
            }

            private boolean annotationNameHasChanged() {
                String oldName = annotation.name;
                String newName = txtName.getText();
                return !newName.equals(oldName);
            }

            private void setNameAndClose() {
                String name = txtName.getText();
                String key = txtKey.getText();
                if (key == null || key.length() == 0) {
                    //This is the default annotation key constructed by AnnotationDescr when none is provided
                    //e.g. @smurf( Pupa ) -> @smurf( value = Pupa ). We explicitly set it to keep the user
                    //experience consistent between what they enter and what is parsed.
                    key = "value";
                }
                String value = txtValue.getText();

                annotation.name = name;
                annotation.getValues().clear();
                annotation.getValues().put(key, value);

                okCommand.execute();

                pop.hide();
            }

            private boolean isTheUserSureHeWantsToChangeTheName() {
                return Window.confirm(constants.ModelNameChangeWarning());
            }

            private boolean doesTheNameExist() {
                for (AnnotationMetaModel a : annotations) {
                    if (a != annotation) {
                        if (a.name.equals(txtName.getText())) {
                            return true;
                        }
                    }
                }
                return false;
            }
        });

        vp.add(g);
        vp.add(btnOK);
        pop.addRow(vp);

        pop.show();
    }

    //This is a simplified annotation editor and thus we only
    //allow creation of a single key-value pair. The underlying
    //parser implementation allows for multiple key-value pairs
    //for the same annotation but it's implementation is incomplete.
    private void setControlValues(AnnotationMetaModel annotation) {
        String name = (annotation.name == null ? "" : annotation.name);
        String key = getFirstEntry(annotation.getValues().keySet());
        String value = getFirstEntry(annotation.getValues().values());
        txtName.setText(name);
        txtKey.setText(key);
        txtValue.setText(value);
    }

    private String getFirstEntry(Collection<String> values) {
        if (values.isEmpty()) {
            return "";
        }
        return values.iterator().next();
    }

}