001 /* 002 * Copyright © 2008, 2012 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 Lesser 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 Lesser General Public License for more details. 018 * 019 * You should have received a copy of the GNU Lesser 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 java.lang.reflect.Type; 029 030 import com.google.gson.JsonParseException; 031 import com.softwarementors.extjs.djn.DirectJNgineException; 032 import com.softwarementors.extjs.djn.StringUtils; 033 import com.softwarementors.extjs.djn.api.RegisteredStandardMethod; 034 import com.softwarementors.extjs.djn.router.processor.ResponseData; 035 036 public class JsonException extends DirectJNgineException { 037 private static final long serialVersionUID = 4992911540391211769L; 038 039 private JsonException( String message, Throwable cause ) { 040 super(message, cause); 041 042 assert !StringUtils.isEmpty(message); 043 assert cause != null; 044 } 045 046 public static JsonException forFailedConversionFromResponseToJson(ResponseData response, Throwable ex) { 047 assert response != null; 048 assert ex != null; 049 050 return new JsonException( "Failed attempt to convert a response to json. " + response.getFullLogDescription(), ex ); 051 } 052 053 public static JsonException forFailedConversionFromJsonStringToMethodParameters(RegisteredStandardMethod method, String jsonParametersString, 054 Class<?>[] parameterTypes, Type[] gsonParameterTypes, JsonParseException ex) 055 { 056 assert method != null; 057 assert jsonParametersString != null; 058 assert parameterTypes != null; 059 assert ex != null; 060 061 StringBuilder typeNames = getCommaSeparatedTypeNames(parameterTypes, gsonParameterTypes); 062 return new JsonException( "Failed attempt to convert from a json string to java method parameters. Method='" + method.getFullName() + "', Json string='" + 063 jsonParametersString + "', ExpectedTypes='" + typeNames + "'", ex ); 064 } 065 066 private static StringBuilder getCommaSeparatedTypeNames(Class<?>[] parameterTypes, Type[] gsonParameterTypes) 067 { 068 StringBuilder typeNames = new StringBuilder(); 069 boolean hasGsonParametersTypes = gsonParameterTypes != null; 070 for( int i = 0; i < parameterTypes.length; i++ ) { 071 Class<?> type = parameterTypes[i]; 072 typeNames.append( type.getName() ); 073 if( hasGsonParametersTypes) { 074 assert gsonParameterTypes != null; 075 076 Type gsonType = gsonParameterTypes[i]; 077 if( gsonType != null) { 078 typeNames.append( " ::GENERIC= "); 079 typeNames.append( gsonType.toString()); 080 typeNames.append( ":: "); 081 } 082 } 083 084 boolean atEnd = i == parameterTypes.length - 1; 085 if( !atEnd ) { 086 typeNames.append( ", "); 087 } 088 } 089 090 return typeNames; 091 } 092 }