117 lines
3.9 KiB
Java
117 lines
3.9 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 class is intended to handle <string> element.
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* This element specifies {@link String} values.
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* The result value is created from text of the body of this element.
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* For example:<pre>
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* <string>description</string></pre>
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* is equivalent to {@code "description"} in Java code.
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* The value of inner element is calculated
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* before adding to the string using {@link String#valueOf(Object)}.
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* Note that all characters are used including whitespaces (' ', '\t', '\n', '\r').
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* So the value of the element<pre>
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* <string><true></string></pre>
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* is not equal to the value of the element<pre>
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* <string>
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* <true>
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* </string></pre>
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* <p>The following attribute is supported:
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* <dl>
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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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public class StringElementHandler extends ElementHandler {
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private StringBuilder sb = new StringBuilder();
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private ValueObject value = ValueObjectImpl.NULL;
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/**
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* Adds the character that contained in this element.
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*
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* @param ch the character
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*/
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@Override
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public final void addCharacter(char ch) {
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if (this.sb == null) {
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throw new IllegalStateException("Could not add chararcter to evaluated string element");
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}
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this.sb.append(ch);
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}
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/**
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* Adds the string value of the argument to the string 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.sb == null) {
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throw new IllegalStateException("Could not add argument to evaluated string element");
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}
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this.sb.append(argument);
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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.sb != null) {
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try {
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this.value = ValueObjectImpl.create(getValue(this.sb.toString()));
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}
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catch (RuntimeException exception) {
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getOwner().handleException(exception);
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}
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finally {
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this.sb = null;
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}
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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 text of the body of this element.
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* This method evaluates value from text of the body,
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* and should be overridden in those handlers
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* that extend behavior of this element.
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*
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* @param argument the text of the body
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* @return evaluated value
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*/
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protected Object getValue(String argument) {
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return argument;
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}
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}
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