Spring Framework example source code file (CustomBooleanEditor.java)

This example Spring Framework source code file (CustomBooleanEditor.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 - Spring Framework tags/keywords

bean, custombooleaneditor, custombooleaneditor, illegalargumentexception, illegalargumentexception, invalid, javabean, string, string, value_0, value_1, value_false, value_false, value_no, value_true, value_yes

The Spring Framework CustomBooleanEditor.java source code

/*
 * Copyright 2002-2007 the original author or authors.
 *
 * 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.springframework.beans.propertyeditors;

import java.beans.PropertyEditorSupport;

import org.springframework.util.StringUtils;

/**
 * Property editor for Boolean/boolean properties.
 *
 * <p>This is not meant to be used as system PropertyEditor but rather as
 * locale-specific Boolean editor within custom controller code, to parse
 * UI-caused boolean strings into boolean properties of beans and check
 * them in the UI form.
 *
 * <p>In web MVC code, this editor will typically be registered with
 * <code>binder.registerCustomEditor calls in an implementation
 * of BaseCommandController's <code>initBinder method.
 *
 * @author Juergen Hoeller
 * @since 10.06.2003
 * @see org.springframework.validation.DataBinder#registerCustomEditor
 * @see org.springframework.web.servlet.mvc.BaseCommandController#initBinder
 */
public class CustomBooleanEditor extends PropertyEditorSupport {

	public static final String VALUE_TRUE = "true";
	public static final String VALUE_FALSE = "false";

	public static final String VALUE_ON = "on";
	public static final String VALUE_OFF = "off";

	public static final String VALUE_YES = "yes";
	public static final String VALUE_NO = "no";

	public static final String VALUE_1 = "1";
	public static final String VALUE_0 = "0";


	private final String trueString;

	private final String falseString;

	private final boolean allowEmpty;


	/**
	 * Create a new CustomBooleanEditor instance, with "true"/"on"/"yes"
	 * and "false"/"off"/"no" as recognized String values.
	 * <p>The "allowEmpty" parameter states if an empty String should
	 * be allowed for parsing, i.e. get interpreted as null value.
	 * Else, an IllegalArgumentException gets thrown in that case.
	 * @param allowEmpty if empty strings should be allowed
	 */
	public CustomBooleanEditor(boolean allowEmpty) {
		this(null, null, allowEmpty);
	}

	/**
	 * Create a new CustomBooleanEditor instance,
	 * with configurable String values for true and false.
	 * <p>The "allowEmpty" parameter states if an empty String should
	 * be allowed for parsing, i.e. get interpreted as null value.
	 * Else, an IllegalArgumentException gets thrown in that case.
	 * @param trueString the String value that represents true:
	 * for example, "true" (VALUE_TRUE), "on" (VALUE_ON),
	 * "yes" (VALUE_YES) or some custom value
	 * @param falseString the String value that represents false:
	 * for example, "false" (VALUE_FALSE), "off" (VALUE_OFF),
	 * "no" (VALUE_NO) or some custom value
	 * @param allowEmpty if empty strings should be allowed
	 * @see #VALUE_TRUE
	 * @see #VALUE_FALSE
	 * @see #VALUE_ON
	 * @see #VALUE_OFF
	 * @see #VALUE_YES
	 * @see #VALUE_NO
	 */
	public CustomBooleanEditor(String trueString, String falseString, boolean allowEmpty) {
		this.trueString = trueString;
		this.falseString = falseString;
		this.allowEmpty = allowEmpty;
	}

	public void setAsText(String text) throws IllegalArgumentException {
		String input = (text != null ? text.trim() : null);
		if (this.allowEmpty && !StringUtils.hasLength(input)) {
			// Treat empty String as null value.
			setValue(null);
		}
		else if (this.trueString != null && input.equalsIgnoreCase(this.trueString)) {
			setValue(Boolean.TRUE);
		}
		else if (this.falseString != null && input.equalsIgnoreCase(this.falseString)) {
			setValue(Boolean.FALSE);
		}
		else if (this.trueString == null &&
				(input.equalsIgnoreCase(VALUE_TRUE) || input.equalsIgnoreCase(VALUE_ON) ||
				input.equalsIgnoreCase(VALUE_YES) || input.equals(VALUE_1))) {
			setValue(Boolean.TRUE);
		}
		else if (this.falseString == null &&
				(input.equalsIgnoreCase(VALUE_FALSE) || input.equalsIgnoreCase(VALUE_OFF) ||
				input.equalsIgnoreCase(VALUE_NO) || input.equals(VALUE_0))) {
			setValue(Boolean.FALSE);
		}
		else {
			throw new IllegalArgumentException("Invalid boolean value [" + text + "]");
		}
	}

	public String getAsText() {
		if (Boolean.TRUE.equals(getValue())) {
			return (this.trueString != null ? this.trueString : VALUE_TRUE);
		}
		else if (Boolean.FALSE.equals(getValue())) {
			return (this.falseString != null ? this.falseString : VALUE_FALSE);
		}
		else {
			return "";
		}
	}

}