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 }