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* 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,
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*
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package com.sun.beans.decoder;
This class is intended to handle <null> element. This element specifies null
value. It should not contain body or inner elements. For example:<null/>
is equivalent to null
in Java code. The following attribute is supported:
- id
- the identifier of the variable that is intended to store the result
Author: Sergey A. Malenkov Since: 1.7
/**
* This class is intended to handle <null> element.
* This element specifies {@code null} value.
* It should not contain body or inner elements.
* For example:<pre>
* <null/></pre>
* is equivalent to {@code null} in Java code.
* <p>The following attribute is supported:
* <dl>
* <dt>id
* <dd>the identifier of the variable that is intended to store the result
* </dl>
*
* @since 1.7
*
* @author Sergey A. Malenkov
*/
class NullElementHandler extends ElementHandler implements ValueObject {
Returns the value of this element.
Returns: the value of this element
/**
* Returns the value of this element.
*
* @return the value of this element
*/
@Override
protected final ValueObject getValueObject() {
return this;
}
Returns null
as a value of <null> element. This method should be overridden in those handlers that extend behavior of this element. Returns: null
by default
/**
* 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 void
state of this value object. Returns: false
always
/**
* Returns {@code void} state of this value object.
*
* @return {@code false} always
*/
public final boolean isVoid() {
return false;
}
}