misc/rosetta/src/main/java/org/onap/aaf/misc/rosetta/marshal/ObjMarshal.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.marshal;
  23
  24 import java.util.Iterator;
  25
  26 import org.onap.aaf.misc.rosetta.Ladder;
  27 import org.onap.aaf.misc.rosetta.Marshal;
  28 import org.onap.aaf.misc.rosetta.ParseException;
  29 import org.onap.aaf.misc.rosetta.Parsed;
  30
  31 /**
  32  * Object Marshal
  33  * Assumes has Fields and other Objects
  34  * s
  35  * @author Jonathan
  36  *
  37  * @param <T>
  38  */
  39 public abstract class ObjMarshal<T> extends Marshal<T> {
  40         // Note: Not Using List or ArrayList, because there is no "Peek" concept in their iterator.
  41         private Marshal<T>[] pml;
  42         private int end=0;
  43
  44         /**
  45          * @param pm
  46          */
  47         @SuppressWarnings("unchecked")
  48         protected void add(Marshal<T> pm) {
  49                 if(pml==null) {
  50                         pml = new Marshal[Ladder.DEFAULT_INIT_SIZE];
  51                 } else if(end>pml.length) {
  52                         Object temp[] = pml;
  53                         pml = new Marshal[pml.length+Ladder.DEFAULT_INIT_SIZE];
  54                         System.arraycopy(temp, 0, pml, 0, pml.length);
  55                 }
  56                 pml[end]=pm;
  57                 ++end;
  58         }
  59
  60         /* (non-Javadoc)
  61          * @see org.onap.aaf.misc.rosetta.Parse#parse(java.lang.Object, org.onap.aaf.misc.rosetta.Parsed)
  62          */
  63         @SuppressWarnings("unchecked")
  64         @Override
  65         public Parsed<State> parse(T in, Parsed<State> parsed) throws ParseException {
  66                 Ladder<Iterator<?>> ladder = parsed.state.ladder;
  67                 Iterator<Marshal<T>> iter = (Iterator<Marshal<T>>)ladder.peek();
  68                 if(iter==null) {
  69                         if(pml.length>0) {
  70                                 ladder.push(new FieldsIterator());
  71                                 parsed.event = START_OBJ;
  72                         } else {
  73                                 ladder.push(DONE_ITERATOR);
  74                         }
  75                 } else if (DONE_ITERATOR.equals(iter)) {
  76                 } else {
  77                         FieldsIterator fields = (FieldsIterator)iter;
  78                         ladder.ascend(); // look at field info
  79                                 Iterator<?> currFieldIter = ladder.peek();
  80                                 Marshal<T> marshal;
  81                                 if(currFieldIter==null) {
  82                                         marshal=fields.next();
  83                                 } else if(!DONE_ITERATOR.equals(currFieldIter)) {
  84                                         marshal=fields.peek();
  85                                         if(marshal==null && fields.hasNext())marshal=fields.next();
  86                                 } else if(fields.hasNext()) {
  87                                         marshal=fields.next();
  88                                         ladder.push(null);
  89                                 } else {
  90                                         marshal=null;
  91                                 }
  92
  93                                 if(marshal!=null)
  94                                         parsed = marshal.parse(in, parsed);
  95                         ladder.descend();
  96                         if(marshal==null || parsed.event==NONE) {
  97                                 parsed.event = END_OBJ;
  98                                 ladder.push(DONE_ITERATOR);
  99                         }
 100                 }
 101                 return parsed; // if unchanged, then it will end process
 102         }
 103
 104         private class FieldsIterator implements Iterator<Marshal<T>> {
 105                 private int idx = -1;
 106
 107                 @Override
 108                 public boolean hasNext() {
 109                         return idx<end;
 110                 }
 111
 112                 @Override
 113                 public Marshal<T> next() {
 114                         return pml[++idx];
 115                 }
 116
 117                 public Marshal<T> peek() {
 118                         return idx<0?null:pml[idx];
 119                 }
 120
 121                 @Override
 122                 public void remove() {
 123                         pml[idx]=null;
 124                 }
 125
 126         }
 127
 128 }