passwordeditor.java

来自「测试工具」· Java 代码 · 共 125 行

/*
 * 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.jmeter.testbeans.gui;

import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.beans.PropertyEditorSupport;

import javax.swing.JPasswordField;

/**
 * This class implements a property editor for non-null String properties that
 * supports custom editing (i.e.: provides a GUI component) based on a text
 * field.
 * <p>
 * The provided GUI is a simple password field.
 * 
 */
public class PasswordEditor extends PropertyEditorSupport implements ActionListener, FocusListener {

	private JPasswordField textField;

	/**
	 * Value on which we started the editing. Used to avoid firing
	 * PropertyChanged events when there's not been such change.
	 */
	private String initialValue = "";

	protected PasswordEditor() {
		super();

		textField = new JPasswordField();
		textField.addActionListener(this);
		textField.addFocusListener(this);
	}

	public String getAsText() {
		return new String(textField.getPassword());
	}

	public void setAsText(String value) {
		initialValue = value;
		textField.setText(value);
	}

	public Object getValue() {
		return getAsText();
	}

	public void setValue(Object value) {
		if (value instanceof String)
			setAsText((String) value);
		else
			throw new IllegalArgumentException();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.beans.PropertyEditor#getCustomEditor()
	 */
	public Component getCustomEditor() {
		return textField;
	}
    
    public boolean supportsCustomEditor() {
        return true;
    }

	/*
	 * (non-Javadoc) Avoid needlessly firing PropertyChanged events.
	 */
	public void firePropertyChange() {
		String newValue = getAsText();

		if (initialValue.equals(newValue))
			return;
		initialValue = newValue;

		super.firePropertyChange();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.awt.event.ActionListener#actionPerformed(java.awt.event.ActionEvent)
	 */
	public void actionPerformed(ActionEvent e) {
		firePropertyChange();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.awt.event.FocusListener#focusGained(java.awt.event.FocusEvent)
	 */
	public void focusGained(FocusEvent e) {
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.awt.event.FocusListener#focusLost(java.awt.event.FocusEvent)
	 */
	public void focusLost(FocusEvent e) {
		firePropertyChange();
	}
}