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 import java.util.NoSuchElementException;
  26
  27 import org.onap.aaf.misc.rosetta.Ladder;
  28 import org.onap.aaf.misc.rosetta.Marshal;
  29 import org.onap.aaf.misc.rosetta.ParseException;
  30 import org.onap.aaf.misc.rosetta.Parsed;
  31
  32 /**
  33  * Object Marshal
  34  * Assumes has Fields and other Objects
  35  * s
  36  * @author Jonathan
  37  *
  38  * @param <T>
  39  */
  40 public abstract class ObjMarshal<T> extends Marshal<T> {
  41         // Note: Not Using List or ArrayList, because there is no "Peek" concept in their iterator.
  42         private Marshal<T>[] pml;
  43         private int end=0;
  44
  45         /**
  46          * @param pm
  47          */
  48         @SuppressWarnings("unchecked")
  49         protected void add(Marshal<T> pm) {
  50                 if(pml==null) {
  51                         pml = new Marshal[Ladder.DEFAULT_INIT_SIZE];
  52                 } else if(end>pml.length) {
  53                         Object temp[] = pml;
  54                         pml = new Marshal[pml.length+Ladder.DEFAULT_INIT_SIZE];
  55                         System.arraycopy(temp, 0, pml, 0, pml.length);
  56                 }
  57                 pml[end]=pm;
  58                 ++end;
  59         }
  60
  61         /* (non-Javadoc)
  62          * @see org.onap.aaf.misc.rosetta.Parse#parse(java.lang.Object, org.onap.aaf.misc.rosetta.Parsed)
  63          */
  64         @SuppressWarnings("unchecked")
  65         @Override
  66         public Parsed<State> parse(T in, Parsed<State> parsed) throws ParseException {
  67                 Ladder<Iterator<?>> ladder = parsed.state.ladder;
  68                 Iterator<Marshal<T>> iter = (Iterator<Marshal<T>>)ladder.peek();
  69                 if(iter==null) {
  70                         if(pml.length>0) {
  71                                 ladder.push(new FieldsIterator());
  72                                 parsed.event = START_OBJ;
  73                         } else {
  74                                 ladder.push(DONE_ITERATOR);
  75                         }
  76                 } else if (!DONE_ITERATOR.equals(iter)) {
  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                         if(!hasNext()) {
 115                                 throw new NoSuchElementException();
 116                         }
 117                         return pml[++idx];
 118                 }
 119
 120                 public Marshal<T> peek() {
 121                         return idx<0?null:pml[idx];
 122                 }
 123
 124                 @Override
 125                 public void remove() {
 126                         pml[idx]=null;
 127                 }
 128
 129         }
 130
 131 }