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     * Commercial use is permitted to the extent that the code/component(s)
011     * do NOT become part of another Open Source or Commercially developed
012     * licensed development library or toolkit without explicit permission.
013     *
014     * DirectJNgine is distributed in the hope that it will be useful,
015     * but WITHOUT ANY WARRANTY; without even the implied warranty of
016     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
017     * GNU General Public License for more details.
018     *
019     * You should have received a copy of the GNU General Public License
020     * along with DirectJNgine.  If not, see <http://www.gnu.org/licenses/>.
021     * 
022     * This software uses the ExtJs library (http://extjs.com), which is 
023     * distributed under the GPL v3 license (see http://extjs.com/license).
024     */
025    
026    package com.softwarementors.extjs.djn.gson;
027    
028    import com.google.gson.JsonParseException;
029    import com.softwarementors.extjs.djn.DirectJNgineException;
030    import com.softwarementors.extjs.djn.StringUtils;
031    import com.softwarementors.extjs.djn.api.RegisteredMethod;
032    import com.softwarementors.extjs.djn.router.processor.ResponseBase;
033    
034    public class JsonException extends DirectJNgineException {
035    
036      private JsonException( String message, Throwable cause ) {
037        super(message, cause);
038        
039        assert !StringUtils.isEmpty(message);
040        assert cause != null;
041      }
042      
043      public static JsonException forFailedConversionFromResponseToJson(ResponseBase response, Throwable ex) {
044        assert response != null;
045        assert ex != null;
046        
047        return new JsonException( "Failed attempt to convert a response to json. " + response.getFullLogDescription(), ex );
048      }
049    
050      public static JsonException forFailedConversionFromJsonStringToMethodParameters(RegisteredMethod method, String jsonParametersString,
051        Class<?>[] parameterTypes, JsonParseException ex) 
052      {
053        assert method != null;
054        assert jsonParametersString != null;
055        assert parameterTypes != null;
056        assert ex != null;
057        
058        StringBuilder typeNames = getCommaSeparatedTypeNames(parameterTypes);
059        return new JsonException( "Failed attempt to convert from a json string to java method parameters. Action='" + method.getActionName() + 
060            "', Method='" + method.getName() + "', Json string='" + 
061            jsonParametersString + "', ExpectedTypes='" + typeNames + "'", ex );
062      }
063    
064      private static StringBuilder getCommaSeparatedTypeNames(Class<?>[] parameterTypes) 
065      {
066        StringBuilder typeNames = new StringBuilder();
067        for( int i = 0; i < parameterTypes.length -1; i++  ) {
068          Class<?> type = parameterTypes[i];
069          typeNames.append( type.getName() + ", ");
070        }
071        if( parameterTypes.length > 0 ) {
072          typeNames.append( parameterTypes[parameterTypes.length-1].getName());
073        }
074        return typeNames;
075      }
076    }