mirror of git://gcc.gnu.org/git/gcc.git
112 lines
4.1 KiB
Java
112 lines
4.1 KiB
Java
/* gnu.java.beans.decoder.SimpleHandler
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Copyright (C) 2004 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.beans.decoder;
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import java.beans.ExceptionListener;
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import org.xml.sax.Attributes;
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/** XML element handler that is specialized on tags that contains a simple string in their
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* body which has to be parsed in a specific way.
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* <p>All of these tags have in common that they do not accept attributes. A warning is
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* send to the parser's ExceptionListener when one or more attributes exist.</p>
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*
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* @author Robert Schuster
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*/
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abstract class SimpleHandler extends AbstractElementHandler
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{
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private ObjectContext context;
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/**
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* @param PersistenceParser
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*/
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SimpleHandler(ElementHandler parent)
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{
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super(parent, false);
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// SimpleHandler do not accept any subelements
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}
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protected final Context startElement(Attributes attributes, ExceptionListener exceptionListener)
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throws AssemblyException
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{
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// note: simple elements should not have any attributes. We inform
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// the user of this syntactical but uncritical problem by sending
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// an IllegalArgumentException for each unneccessary attribute
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int size = attributes.getLength();
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for (int i = 0; i < size; i++) {
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String attributeName = attributes.getQName(i);
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Exception e =
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new IllegalArgumentException(
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"Unneccessary attribute '"
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+ attributeName
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+ "' discarded.");
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exceptionListener.exceptionThrown(e);
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}
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return context = new ObjectContext();
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}
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public void endElement(String characters)
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throws AssemblyException, AssemblyException
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{
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// reports the number when the character data can be parsed
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try
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{
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context.setObject(parse(characters));
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}
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catch (NumberFormatException nfe)
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{
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throw new AssemblyException(nfe);
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}
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}
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/** Returns an object that is created from the given characters. If the string is
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* converted into a number a NumberFormatException is cathed and reported
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* appropriately.
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*
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* @param characters A string of characters that has to be processed in some way.
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* @return An Object instance generated from the given data.
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* @throws AssemblerException When the string was invalid.
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* @throws NumberFormatException When the string could not be parsed into a number.
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*/
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protected abstract Object parse(String characters)
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throws AssemblyException, NumberFormatException;
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}
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