001    /*
002     * Copyright © 2008, 2009 Pedro Agulló Soliveres.
003     * 
004     * This file is part of DirectJNgine.
005     *
006     * DirectJNgine is free software: you can redistribute it and/or modify
007     * it under the terms of the GNU General Public License as published by
008     * the Free Software Foundation, either version 3 of the License.
009     *
010     * DirectJNgine is distributed in the hope that it will be useful,
011     * but WITHOUT ANY WARRANTY; without even the implied warranty of
012     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013     * GNU General Public License for more details.
014     *
015     * You should have received a copy of the GNU General Public License
016     * along with DirectJNgine.  If not, see <http://www.gnu.org/licenses/>.
017     * 
018     * This software uses the ExtJs library (http://extjs.com), which is 
019     * distributed under the GPL v3 license (see http://extjs.com/license).
020     */
021    
022    package com.softwarementors.extjs.djn.router;
023    
024    import com.google.gson.JsonParseException;
025    import com.softwarementors.extjs.djn.DirectJNgineException;
026    import com.softwarementors.extjs.djn.StringUtils;
027    import com.softwarementors.extjs.djn.config.RegisteredMethod;
028    
029    public class JsonException extends DirectJNgineException {
030    
031      private JsonException( String message, Throwable cause ) {
032        super(message, cause);
033        
034        assert !StringUtils.isEmpty(message);
035        assert cause != null;
036      }
037      
038      public static JsonException forFailedConversionFromResponseToJson(ResponseBase response, Throwable ex) {
039        assert response != null;
040        assert ex != null;
041        
042        return new JsonException( "Failed attempt to convert a response to json. " + response.getFullLogDescription(), ex );
043      }
044    
045      public static JsonException forFailedConversionFromJsonStringToMethodParameters(RegisteredMethod method, String jsonParametersString,
046        Class<?>[] parameterTypes, JsonParseException ex) 
047      {
048        assert method != null;
049        assert jsonParametersString != null;
050        assert parameterTypes != null;
051        assert ex != null;
052        
053        StringBuilder typeNames = getCommaSeparatedTypeNames(parameterTypes);
054        return new JsonException( "Failed attempt to convert from a json string to java method parameters. Action='" + method.getActionName() + 
055            "', Method='" + method.getName() + "', Json string='" + 
056            jsonParametersString + "', ExpectedTypes='" + typeNames + "'", ex );
057      }
058    
059      private static StringBuilder getCommaSeparatedTypeNames(Class<?>[] parameterTypes) 
060      {
061        StringBuilder typeNames = new StringBuilder();
062        for( int i = 0; i < parameterTypes.length -1; i++  ) {
063          Class<?> type = parameterTypes[i];
064          typeNames.append( type.getName() + ", ");
065        }
066        if( parameterTypes.length > 0 ) {
067          typeNames.append( parameterTypes[parameterTypes.length-1].getName());
068        }
069        return typeNames;
070      }
071    }