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-/* gnu.java.beans.decoder.SimpleHandler
- Copyright (C) 2004 Free Software Foundation, Inc.
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Classpath 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 for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-package gnu.java.beans.decoder;
-
-import java.beans.ExceptionListener;
-
-import org.xml.sax.Attributes;
-
-/** XML element handler that is specialized on tags that contains a simple string in their
- * body which has to be parsed in a specific way.
- * <p>All of these tags have in common that they do not accept attributes. A warning is
- * send to the parser's ExceptionListener when one or more attributes exist.</p>
- *
- * @author Robert Schuster
- */
-abstract class SimpleHandler extends AbstractElementHandler
-{
- private ObjectContext context;
-
- /**
- * @param PersistenceParser
- */
- SimpleHandler(ElementHandler parent)
- {
- super(parent, false);
-
- // SimpleHandler do not accept any subelements
- }
-
- protected final Context startElement(Attributes attributes, ExceptionListener exceptionListener)
- throws AssemblyException
- {
-
- // note: simple elements should not have any attributes. We inform
- // the user of this syntactical but uncritical problem by sending
- // an IllegalArgumentException for each unneccessary attribute
- int size = attributes.getLength();
- for (int i = 0; i < size; i++) {
- String attributeName = attributes.getQName(i);
- Exception e =
- new IllegalArgumentException(
- "Unneccessary attribute '"
- + attributeName
- + "' discarded.");
- exceptionListener.exceptionThrown(e);
- }
-
- return context = new ObjectContext();
- }
-
- public void endElement(String characters)
- throws AssemblyException, AssemblyException
- {
- // reports the number when the character data can be parsed
- try
- {
- context.setObject(parse(characters));
- }
- catch (NumberFormatException nfe)
- {
- throw new AssemblyException(nfe);
- }
- }
-
- /** Returns an object that is created from the given characters. If the string is
- * converted into a number a NumberFormatException is cathed and reported
- * appropriately.
- *
- * @param characters A string of characters that has to be processed in some way.
- * @return An Object instance generated from the given data.
- * @throws AssemblerException When the string was invalid.
- * @throws NumberFormatException When the string could not be parsed into a number.
- */
- protected abstract Object parse(String characters)
- throws AssemblyException, NumberFormatException;
-}
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