package org.apache.velocity.runtime.parser.node;
/*
* Copyright 2000-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License")
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import org.apache.velocity.runtime.RuntimeLogger;
import org.apache.velocity.runtime.log.Log;
import org.apache.velocity.runtime.log.RuntimeLoggerLog;
import org.apache.velocity.util.introspection.Introspector;
/**
* Handles discovery and valuation of a
* boolean object property, of the
* form public boolean is<property> when executed.
*
* We do this separately as to preserve the current
* quasi-broken semantics of get<as is property>
* get< flip 1st char> get("property") and now followed
* by is<Property>
*
* @author <a href="geirm@apache.org">Geir Magnusson Jr.</a>
* @version $Id: BooleanPropertyExecutor.java 440724 2006-09-06 14:32:36Z henning $
*/
public class BooleanPropertyExecutor extends PropertyExecutor
{
public BooleanPropertyExecutor(final Log log, final Introspector introspector,
final Class clazz, final String property)
{
super(log, introspector, clazz, property);
}
/**
* @deprecated RuntimeLogger is deprecated. Use the other constructor.
*/
public BooleanPropertyExecutor(final RuntimeLogger rlog, final Introspector introspector,
final Class clazz, final String property)
{
super(new RuntimeLoggerLog(rlog), introspector, clazz, property);
}
protected void discover(final Class clazz, final String property)
{
try
{
Object [] params = {};
StringBuffer sb = new StringBuffer("is");
sb.append(property);
setMethod(getIntrospector().getMethod(clazz, sb.toString(), params));
if (!isAlive())
{
/*
* now the convenience, flip the 1st character
*/
char c = sb.charAt(2);
if (Character.isLowerCase(c))
{
sb.setCharAt(2, Character.toUpperCase(c));
}
else
{
sb.setCharAt(2, Character.toLowerCase(c));
}
setMethod(getIntrospector().getMethod(clazz, sb.toString(), params));
}
if (isAlive())
{
if (getMethod().getReturnType() != Boolean.TYPE)
{
setMethod(null); // That case is rare but not unknown
}
}
}
/**
* pass through application level runtime exceptions
*/
catch( RuntimeException e )
{
throw e;
}
catch(Exception e)
{
log.error("While looking for boolean property getter for '" + property + "':", e);
}
}
}