nl.nn.xmldecoder.NullElementHandler Maven / Gradle / Ivy
/*
* Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package nl.nn.xmldecoder;
/**
* This class is intended to handle <null> element.
* This element specifies {@code null} value.
* It should not contain body or inner elements.
* For example:
* <null/>
* is equivalent to {@code null} in Java code.
* The following atribute is supported:
*
* - id
*
- the identifier of the variable that is intended to store the result
*
*
* @since 1.7
*
* @author Sergey A. Malenkov
*/
class NullElementHandler extends ElementHandler implements ValueObject {
/**
* Returns the value of this element.
*
* @return the value of this element
*/
@Override
protected final ValueObject getValueObject() {
return this;
}
/**
* Returns {@code null}
* as a value of <null> element.
* This method should be overridden in those handlers
* that extend behavior of this element.
*
* @return {@code null} by default
*/
public Object getValue() {
return null;
}
/**
* Returns {@code void} state of this value object.
*
* @return {@code false} always
*/
public final boolean isVoid() {
return false;
}
}