JMeter example source code file (JLabeledRadio.java)

This example JMeter source code file (JLabeledRadio.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - JMeter tags/keywords

abstractbutton, arraylist, awt, buttongroup, buttongroup, changeevent, enumeration, enumeration, event, gui, jlabel, jlabeledradio, jlabeledradio, jradiobutton, list, string, string, swing, util

The JMeter JLabeledRadio.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.jorphan.gui;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.LinkedList;
import java.util.List;

import javax.swing.AbstractButton;
import javax.swing.ButtonGroup;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;

/**
 * JLabeledRadio will create a set of Radio buttons with a label.
 * 
 * @see org.apache.jmeter.gui.util.JLabeledRadioI18N for a version that is better suited to
 * multi-language use.
 */
public class JLabeledRadio extends JPanel implements JLabeledField, ActionListener {

    private static final long serialVersionUID = 240L;

    private final JLabel mLabel = new JLabel();

    private final ButtonGroup bGroup = new ButtonGroup();

    private final ArrayList<ChangeListener> mChangeListeners = new ArrayList(3);

    /**
     *
     */
    public JLabeledRadio() {
        super();
        this.add(mLabel);
    }

    public JLabeledRadio(String label, String[] items) {
        mLabel.setText(label);
        init(items, null);
    }

    public JLabeledRadio(String label, String[] items, String selectedItem) {
        mLabel.setText(label);
        init(items, selectedItem);
    }

    /**
     * Method is responsible for creating the JRadioButtons and adding them to
     * the ButtonGroup.
     *
     * @param items
     */
    private void init(String[] items, String selected) {
        this.add(mLabel);
        for (int idx = 0; idx < items.length; idx++) {
            JRadioButton btn = new JRadioButton(items[idx]);
            btn.setActionCommand(items[idx]);
            btn.addActionListener(this);
            // add the button to the button group
            this.bGroup.add(btn);
            // add the button
            this.add(btn);
            if (selected != null && selected.equals(items[idx])) {
                btn.setSelected(true);
            }
        }
    }

    /**
     * setItems will set the radio button items. The implementation first
     * removes the old JRadioButton, then it creates new ones.
     *
     * @param items
     */
    public void setItems(String[] items) {
        Enumeration<AbstractButton> en = this.bGroup.getElements();
        while (en.hasMoreElements()) {
            AbstractButton comp = en.nextElement();
            this.bGroup.remove(comp);
            this.remove(comp);
        }
        init(items, null);
    }

    /**
     * The implementation will get the Text value from the selected radio button
     * in the JButtonGroup.
     */
    public String getText() {
        return this.bGroup.getSelection().getActionCommand();
    }

    /**
     * The implementation will iterate through the radio buttons and find the
     * match. It then sets it to selected and sets all other radion buttons as
     * not selected.
     */
    public void setText(String text) {
        Enumeration<AbstractButton> en = this.bGroup.getElements();
        while (en.hasMoreElements()) {
            AbstractButton jrb = en.nextElement();
            if (jrb.getText().equals(text)) {
                this.bGroup.setSelected(jrb.getModel(), true);
            } else {
                this.bGroup.setSelected(jrb.getModel(), false);
            }
        }
    }

    /**
     * {@inheritDoc}
     */
    public void setLabel(String pLabel) {
        this.mLabel.setText(pLabel);
    }

    /**
     * {@inheritDoc}
     */
    public void addChangeListener(ChangeListener pChangeListener) {
        this.mChangeListeners.add(pChangeListener);
    }

    /**
     * Notify all registered change listeners that the text in the text field
     * has changed.
     */
    private void notifyChangeListeners() {
        ChangeEvent ce = new ChangeEvent(this);
        for (int index = 0; index < mChangeListeners.size(); index++) {
            mChangeListeners.get(index).stateChanged(ce);
        }
    }

    /**
     * Method will return all the label and JRadioButtons. ButtonGroup is
     * excluded from the list.
     */
    public List<JComponent> getComponentList() {
        List<JComponent> comps = new LinkedList();
        comps.add(mLabel);
        Enumeration<AbstractButton> en = this.bGroup.getElements();
        while (en.hasMoreElements()) {
            comps.add(en.nextElement());
        }
        return comps;
    }

    /**
     * When a radio button is clicked, an ActionEvent is triggered.
     */
    public void actionPerformed(ActionEvent e) {
        this.notifyChangeListeners();
    }

}