106 lines
3.5 KiB
Java
106 lines
3.5 KiB
Java
/*
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* Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.beans.decoder;
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/**
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* This is base class that simplifies access to entities (fields or properties).
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* The {@code name} attribute specifies the name of the accessible entity.
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* The element defines getter if it contains no argument
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* or setter if it contains one argument.
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*
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* @since 1.7
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*
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* @author Sergey A. Malenkov
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*/
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abstract class AccessorElementHandler extends ElementHandler {
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private String name;
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private ValueObject value;
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/**
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* Parses attributes of the element.
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* The following attributes are supported:
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* <dl>
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* <dt>name
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* <dd>the name of the accessible entity
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* <dt>id
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* <dd>the identifier of the variable that is intended to store the result
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* </dl>
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*
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* @param name the attribute name
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* @param value the attribute value
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*/
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@Override
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public void addAttribute(String name, String value) {
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if (name.equals("name")) { // NON-NLS: the attribute name
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this.name = value;
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} else {
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super.addAttribute(name, value);
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}
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}
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/**
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* Adds the argument that is used to set the value of this element.
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*
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* @param argument the value of the element that contained in this one
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*/
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@Override
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protected final void addArgument(Object argument) {
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if (this.value != null) {
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throw new IllegalStateException("Could not add argument to evaluated element");
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}
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setValue(this.name, argument);
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this.value = ValueObjectImpl.VOID;
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}
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/**
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* Returns the value of this element.
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*
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* @return the value of this element
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*/
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@Override
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protected final ValueObject getValueObject() {
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if (this.value == null) {
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this.value = ValueObjectImpl.create(getValue(this.name));
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}
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return this.value;
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}
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/**
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* Returns the value of the entity with specified {@code name}.
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*
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* @param name the name of the accessible entity
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* @return the value of the specified entity
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*/
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protected abstract Object getValue(String name);
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/**
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* Sets the new value for the entity with specified {@code name}.
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*
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* @param name the name of the accessible entity
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* @param value the new value for the specified entity
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*/
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protected abstract void setValue(String name, Object value);
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}
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