PropagateEvaluationExceptionHandler.java
- /*
- * $Source$
- * $Revision$
- *
- * Copyright (C) 2000 Tim Joyce
- *
- * Part of Melati (http://melati.org), a framework for the rapid
- * development of clean, maintainable web applications.
- *
- * Melati is free software; Permission is granted to copy, distribute
- * and/or modify this software under the terms either:
- *
- * a) the GNU General Public License as published by the Free Software
- * Foundation; either version 2 of the License, or (at your option)
- * any later version,
- *
- * or
- *
- * b) any version of the Melati Software License, as published
- * at http://melati.org
- *
- * You should have received a copy of the GNU General Public License and
- * the Melati Software License along with this program;
- * if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA to obtain the
- * GNU General Public License and visit http://melati.org to obtain the
- * Melati Software License.
- *
- * Feel free to contact the Developers of Melati (http://melati.org),
- * if you would like to work out a different arrangement than the options
- * outlined here. It is our intention to allow Melati to be used by as
- * wide an audience as possible.
- *
- * This program 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.
- *
- * Contact details for copyright holder:
- *
- * Tim Joyce <timj At paneris.org>
- */
- package org.melati.template.webmacro;
- import org.webmacro.PropertyException;
- import org.webmacro.Context;
- import org.webmacro.Broker;
- import org.webmacro.engine.EvaluationExceptionHandler;
- import org.webmacro.engine.Variable;
- import org.webmacro.util.Settings;
- /**
- * An implementation of EvaluationExceptionHandler which throws an exception
- * whenever it is called.
- *
- * This will generally cause the exception to be
- * displayed to the user -- useful for debugging.
- *
- * Modified to allow #if ($null).
- *
- * @author Tim Joyce
- * @since 2001-11-05
- */
- public class PropagateEvaluationExceptionHandler
- implements EvaluationExceptionHandler {
- /**
- * Constructor.
- */
- public PropagateEvaluationExceptionHandler() {
- }
- /**
- * Forced upon us by the interface, but unused.
- */
- @Override
- public void init(Broker b, Settings config) {
- }
- @Override
- public void evaluate(Variable variable,
- Context context,
- Exception problem)
- throws PropertyException {
- if (problem instanceof PropertyException.NoSuchVariableException
- || problem instanceof PropertyException.NullValueException
- || problem instanceof PropertyException.NullToStringException)
- return;
- if (problem instanceof PropertyException)
- throw (PropertyException) problem;
- else
- throw new PropertyException("Error evaluating variable "
- + variable.getVariableName() + ": "
- + problem, problem);
- }
- /**
- * {@inheritDoc}
- * @see org.webmacro.engine.EvaluationExceptionHandler#expand(
- * org.webmacro.engine.Variable, org.webmacro.Context, java.lang.Exception)
- */
- public String expand(Variable variable,
- Context context,
- Exception problem)
- throws PropertyException {
- if (problem instanceof PropertyException)
- throw (PropertyException) problem;
- else
- throw new PropertyException("Error evaluating variable "
- + variable.getVariableName() + ": "
- + problem, problem);
- }
- /**
- * {@inheritDoc}
- * @see org.webmacro.engine.EvaluationExceptionHandler#warningString(java.lang.String)
- */
- public String warningString(String warningText) throws PropertyException {
- throw new PropertyException("Evaluation warning: " + warningText);
- }
- /**
- * {@inheritDoc}
- *
- * I do not believe that this can be exercised, without a bug in webmacro.
- * @see org.webmacro.engine.EvaluationExceptionHandler#errorString(java.lang.String)
- */
- public String errorString(String errorText) throws PropertyException {
- throw new PropertyException("Evaluation error: " + errorText);
- }
- }