misc/rosetta/src/main/java/org/onap/aaf/misc/rosetta/InJson.java

   1 /**
   2  * ============LICENSE_START====================================================
   3  * org.onap.aaf
   4  * ===========================================================================
   5  * Copyright (c) 2018 AT&T Intellectual Property. All rights reserved.
   6  * ===========================================================================
   7  * Licensed under the Apache License, Version 2.0 (the "License");
   8  * you may not use this file except in compliance with the License.
   9  * You may obtain a copy of the License at
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  * ============LICENSE_END====================================================
  19  *
  20  */
  21
  22 package org.onap.aaf.misc.rosetta;
  23
  24 import java.io.IOException;
  25 import java.io.Reader;
  26
  27 import org.onap.aaf.misc.env.Env;
  28 import org.onap.aaf.misc.env.TimeTaken;
  29 import org.onap.aaf.misc.rosetta.InJson.State;
  30
  31 public class InJson implements Parse<Reader, State> {
  32     public Parsed<State> parse(Reader r, Parsed<State> parsed) throws ParseException {
  33         // First things first, if there's a "leftover" event, process that immediately
  34         State state = (State)parsed.state;
  35         if (state.unsent > 0) {
  36             parsed.event = state.unsent;
  37             state.unsent = 0;
  38             return parsed;
  39         }
  40
  41         int ch;
  42         char c;
  43         StringBuilder sb = parsed.sb;
  44         boolean inQuotes = false, escaped = false;
  45         boolean go = true;
  46         try {
  47             // Gather data from Reader, looking for special characters when not in Quotes
  48             while (go && (ch=r.read())>=0) {
  49                 if (state.braces>=0 || ch==Parse.START_OBJ) { // ignore garbage/whitespace before content
  50                     c=(char)ch;
  51                     // Character is a quote.
  52                     if (c=='"') {
  53                         if (inQuotes) {
  54                             if (escaped) {  // if escaped Quote, add to data.
  55                                 sb.append(c);
  56                                 escaped = false;
  57                             } else {
  58                                 inQuotes = false;
  59                             }
  60                         } else {
  61                             parsed.isString=true;
  62                             inQuotes = true;
  63                         }
  64                     } else { // Not a Quote
  65                         if (inQuotes) {
  66                             if (c=='\\') {
  67                                 if (escaped) {
  68                                     sb.append("\\\\");
  69                                     escaped = false;
  70                                 } else {
  71                                     escaped = true;
  72                                 }
  73                             } else {
  74                                 sb.append(c);
  75                             }
  76                         } else {
  77                             switch(c) {
  78                                 case ':':
  79                                     parsed.dataIsName();
  80                                     parsed.isString = false;
  81                                     break;
  82                                 case Parse.START_OBJ:
  83                                     if (state.braces++ == 0) {
  84                                         parsed.event = START_DOC;
  85                                         state.unsent = c;
  86                                     } else {
  87                                         parsed.event = c;
  88                                     }
  89                                     go = false;
  90                                     break;
  91                                 case Parse.END_OBJ:
  92                                     if (--state.braces == 0) {
  93                                         parsed.event = c;
  94                                         state.unsent = END_DOC;
  95                                     } else {
  96                                         parsed.event = c;
  97                                     }
  98                                     go = false;
  99                                     break;
 100                                 // These three end the data gathering, and send it along with the event that is ending the data gathering
 101                                 case Parse.NEXT:
 102                                     if (parsed.name.startsWith("__")) {
 103                                         parsed.event = Parse.ATTRIB;
 104                                         parsed.name = parsed.name.substring(2);
 105                                     } else {
 106                                         parsed.event = c;
 107                                     }
 108                                     go = false;
 109                                     break;
 110                                 case Parse.START_ARRAY:
 111                                 case Parse.END_ARRAY:
 112                                     parsed.event = c;
 113                                     go = false;
 114                                     break;
 115
 116                                 // The Escape Sequence, for Quote marks within Quotes
 117                                 case '\\':
 118                                 // Ignore these, unless within quotes, at which point data-gather
 119                                 case ' ':
 120                                 case '\b':
 121                                 case '\f':
 122                                 case '\n':
 123                                 case '\r':
 124                                 case '\t':
 125                                     break;
 126                                 // Normal data... gather it
 127                                 default:
 128                                     sb.append(c);
 129                             }
 130                         }
 131                     }
 132                 }
 133             }
 134             return parsed;
 135         } catch (IOException e) {
 136             throw new ParseException(e);
 137         }
 138     }
 139
 140     public static class State {
 141         public int braces = 0;
 142         public char unsent = 0;
 143     }
 144
 145 //    @Override
 146     public Parsed<State> newParsed() {
 147         return new Parsed<State>(new State()); // no State needed
 148     }
 149
 150 //    @Override
 151     public TimeTaken start(Env env) {
 152         return env.start("Rosetta JSON In", Env.JSON);
 153     }
 154 }