/*
* 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 com.sun.beans.decoder;
/**
* This is base class that simplifies access to entities (fields or properties).
* The {@code name} attribute specifies the name of the accessible entity.
* The element defines getter if it contains no argument
* or setter if it contains one argument.
*
* @since 1.7
*
* @author Sergey A. Malenkov
*/
abstract class AccessorElementHandler extends ElementHandler {
private String name;
private ValueObject value;
/**
* Parses attributes of the element.
* The following atributes are supported:
* <dl>
* <dt>name
* <dd>the name of the accessible entity
* <dt>id
* <dd>the identifier of the variable that is intended to store the result
* </dl>
*
* @param name the attribute name
* @param value the attribute value
*/
@Override
public void addAttribute(String name, String value) {
if (name.equals("name")) { // NON-NLS: the attribute name
this.name = value;
} else {
super.addAttribute(name, value);
}
}
/**
* Adds the argument that is used to set the value of this element.
*
* @param argument the value of the element that contained in this one
*/
@Override
protected final void addArgument(Object argument) {
if (this.value != null) {
throw new IllegalStateException("Could not add argument to evaluated element");
}
setValue(this.name, argument);
this.value = ValueObjectImpl.VOID;
}
/**
* Returns the value of this element.
*
* @return the value of this element
*/
@Override
protected final ValueObject getValueObject() {
if (this.value == null) {
this.value = ValueObjectImpl.create(getValue(this.name));
}
return this.value;
}
/**
* Returns the value of the entity with specified {@code name}.
*
* @param name the name of the accessible entity
* @return the value of the specified entity
*/
protected abstract Object getValue(String name);
/**
* Sets the new value for the entity with specified {@code name}.
*
* @param name the name of the accessible entity
* @param value the new value for the specified entity
*/
protected abstract void setValue(String name, Object value);
}