190 lines
6.6 KiB
Java
190 lines
6.6 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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import com.sun.beans.finder.FieldFinder;
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import java.lang.reflect.Field;
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/**
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* This class is intended to handle <field> element.
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* This element simplifies access to the fields.
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* If the {@code class} attribute is specified
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* this element accesses static field of specified class.
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* This element defines getter if it contains no argument.
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* It returns the value of the field in this case.
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* For example:<pre>
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* <field name="TYPE" class="java.lang.Long"/></pre>
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* is equivalent to {@code Long.TYPE} in Java code.
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* This element defines setter if it contains one argument.
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* It does not return the value of the field in this case.
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* For example:<pre>
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* <field name="id"><int>0</int></field></pre>
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* is equivalent to {@code id = 0} in Java code.
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* <p>The following attributes are supported:
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* <dl>
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* <dt>name
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* <dd>the field name
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* <dt>class
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* <dd>the type is used for static fields only
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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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* @since 1.7
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*
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* @author Sergey A. Malenkov
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*/
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final class FieldElementHandler extends AccessorElementHandler {
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private Class<?> type;
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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 field name
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* <dt>class
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* <dd>the type is used for static fields only
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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("class")) { // NON-NLS: the attribute name
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this.type = getOwner().findClass(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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* Tests whether the value of this element can be used
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* as an argument of the element that contained in this one.
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*
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* @return {@code true} if the value of this element should be used
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* as an argument of the element that contained in this one,
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* {@code false} otherwise
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*/
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@Override
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protected boolean isArgument() {
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return super.isArgument() && (this.type != null); // only static accessor can be used an argument
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}
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/**
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* Returns the context of the field.
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* The context of the static field is the class object.
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* The context of the non-static field is the value of the parent element.
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*
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* @return the context of the field
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*/
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@Override
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protected Object getContextBean() {
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return (this.type != null)
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? this.type
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: super.getContextBean();
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}
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/**
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* Returns the value of the field with specified {@code name}.
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*
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* @param name the name of the field
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* @return the value of the specified field
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*/
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@Override
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protected Object getValue(String name) {
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try {
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return getFieldValue(getContextBean(), name);
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}
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catch (Exception exception) {
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getOwner().handleException(exception);
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}
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return null;
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}
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/**
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* Sets the new value for the field with specified {@code name}.
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*
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* @param name the name of the field
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* @param value the new value for the specified field
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*/
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@Override
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protected void setValue(String name, Object value) {
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try {
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setFieldValue(getContextBean(), name, value);
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}
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catch (Exception exception) {
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getOwner().handleException(exception);
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}
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}
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/**
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* Performs the search of the field with specified {@code name}
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* in specified context and returns its value.
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*
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* @param bean the context bean that contains field
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* @param name the name of the field
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* @return the value of the field
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* @throws IllegalAccessException if the field is not accesible
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* @throws NoSuchFieldException if the field is not found
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*/
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static Object getFieldValue(Object bean, String name) throws IllegalAccessException, NoSuchFieldException {
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return findField(bean, name).get(bean);
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}
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/**
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* Performs the search of the field with specified {@code name}
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* in specified context and updates its value.
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*
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* @param bean the context bean that contains field
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* @param name the name of the field
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* @param value the new value for the field
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* @throws IllegalAccessException if the field is not accesible
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* @throws NoSuchFieldException if the field is not found
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*/
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private static void setFieldValue(Object bean, String name, Object value) throws IllegalAccessException, NoSuchFieldException {
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findField(bean, name).set(bean, value);
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}
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/**
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* Performs the search of the field
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* with specified {@code name} in specified context.
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*
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* @param bean the context bean that contains field
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* @param name the name of the field
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* @return field object that represents found field
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* @throws NoSuchFieldException if the field is not found
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*/
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private static Field findField(Object bean, String name) throws NoSuchFieldException {
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return (bean instanceof Class<?>)
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? FieldFinder.findStaticField((Class<?>) bean, name)
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: FieldFinder.findField(bean.getClass(), name);
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}
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}
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