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Ladybug adds message based debugging and message based unit testing and system testing to your Java application. Call Ladybug at certain checkpoints in you code (either directly or using AOP) to generate tree based reports. Implement a rerun method to be able to rerun reports and optionally stub certain checkpoints for regression testing.

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/*
 * 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 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:
     * 
     * name
     * 
the name of the accessible entity
     * 
id
     * 
the identifier of the variable that is intended to store the result
     * 
     *
     * @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);
}