hydrograph.ui.expression.editor.buttons.OperatorToolCombo.java Source code

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Here is the source code for hydrograph.ui.expression.editor.buttons.OperatorToolCombo.java

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/*******************************************************************************
 * Copyright 2017 Capital One Services, LLC and Bitwise, 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 hydrograph.ui.expression.editor.buttons;

import hydrograph.ui.expression.editor.PathConstant;
import hydrograph.ui.expression.editor.Messages;
import hydrograph.ui.expression.editor.message.CustomMessageBox;
import hydrograph.ui.expression.editor.util.ExpressionEditorUtil;
import hydrograph.ui.logging.factory.LogFactory;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.apache.commons.lang.StringUtils;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.StyledText;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.slf4j.Logger;

public class OperatorToolCombo extends Combo {

    private Logger LOGGER = LogFactory.INSTANCE.getLogger(OperatorToolCombo.class);
    private static final String ITEM_TEXT = "Operators";
    private StyledText expressionEditor;

    public OperatorToolCombo(Composite composite, int style, StyledText expressionEditor) {
        super(composite, style);
        this.expressionEditor = expressionEditor;
        this.add(ITEM_TEXT);
        this.select(0);
        setToolTipText(Messages.OPERATORS_TOOLTIP);

        loadDropDownItems();

        addSelectionListener();

        getParent().pack();

    }

    private void addSelectionListener() {
        this.addSelectionListener(new SelectionListener() {

            @Override
            public void widgetSelected(SelectionEvent e) {
                if (getData(getItem(getSelectionIndex())) != null) {
                    expressionEditor.insert((String) getData(getItem(getSelectionIndex())));
                }
                select(0);
            }

            @Override
            public void widgetDefaultSelected(SelectionEvent e) {
                setListVisible(true);
            }
        });
    }

    private void loadDropDownItems() {
        Properties properties = new Properties();
        InputStream inStream;
        try {
            inStream = ExpressionEditorUtil.INSTANCE.getPropertyFilePath(PathConstant.OPERATOR_CONFIG_FILE);
            properties.load(inStream);
            for (Object key : properties.keySet()) {
                if (key != null && properties.get(key) != null) {
                    String operatorName = StringUtils.replaceChars((String) key, '_', SWT.SPACE);
                    this.add(operatorName);
                    this.setData(operatorName, (String) properties.get(key));
                }
            }
        } catch (IOException | RuntimeException exception) {
            LOGGER.error("Exception occurred while loading property file.", exception);
            StringBuffer buffer = new StringBuffer();
            buffer.append(Messages.OPERATOR_FILE_NOT_FOUND);
            new CustomMessageBox(SWT.ICON_WARNING, buffer.toString(), Messages.WARNING).open();
        }
    }

    protected void checkSubclass() {
        // Allow subclassing 
    }

}