chengfan | c58d4be | 2016-09-20 10:33:12 +0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2016-present Open Networking Laboratory |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.onosproject.protocol.restconf.server.utils.parser.json; |
| 18 | |
| 19 | import com.fasterxml.jackson.databind.node.JsonNodeType; |
| 20 | import org.onosproject.protocol.restconf.server.utils.exceptions.YdtParseException; |
| 21 | import org.onosproject.protocol.restconf.server.utils.parser.api.JsonBuilder; |
| 22 | import org.onosproject.yms.ydt.YdtContext; |
| 23 | import org.onosproject.yms.ydt.YdtListener; |
| 24 | |
| 25 | import static com.google.common.base.Strings.isNullOrEmpty; |
| 26 | |
| 27 | /** |
| 28 | * Represents implementation of codec YDT listener. |
| 29 | */ |
| 30 | public class YdtToJsonListener implements YdtListener { |
| 31 | |
| 32 | private static final String EMPTY = ""; |
| 33 | private JsonBuilder jsonBuilder; |
| 34 | //the root name of the json |
| 35 | //the input YdtContext is usually a total tree of a YANG resource |
| 36 | //this property is used to mark the start of the request node. |
| 37 | private String rootName; |
| 38 | //the parse state |
| 39 | private boolean isBegin; |
| 40 | |
| 41 | /** |
| 42 | * Creates a listener for the process of a Ydt, the listener will try to |
| 43 | * transfer the Ydt to a JSON Object. |
| 44 | * |
| 45 | * @param rootName the name of a specific YdtContext begin to process |
| 46 | * @param jsonBuilder the JSON builder to build a JSON object |
| 47 | */ |
| 48 | public YdtToJsonListener(String rootName, JsonBuilder jsonBuilder) { |
| 49 | this.jsonBuilder = jsonBuilder; |
| 50 | this.rootName = rootName; |
| 51 | this.isBegin = isNullOrEmpty(rootName); |
| 52 | } |
| 53 | |
| 54 | @Override |
| 55 | public void enterYdtNode(YdtContext ydtContext) { |
| 56 | String name = ydtContext.getName(); |
| 57 | |
Henry Yu | 7dbfc20 | 2016-10-24 16:00:37 -0400 | [diff] [blame] | 58 | if (!isBegin && name != null && name.equals(rootName)) { |
chengfan | c58d4be | 2016-09-20 10:33:12 +0800 | [diff] [blame] | 59 | isBegin = true; |
| 60 | } |
| 61 | if (!isBegin) { |
| 62 | return; |
| 63 | } |
| 64 | |
| 65 | switch (ydtContext.getYdtType()) { |
| 66 | |
| 67 | case SINGLE_INSTANCE_NODE: |
| 68 | jsonBuilder.addNodeTopHalf(name, JsonNodeType.OBJECT); |
| 69 | break; |
| 70 | case MULTI_INSTANCE_NODE: |
| 71 | YdtContext preNode = ydtContext.getPreviousSibling(); |
| 72 | if (preNode == null || !preNode.getName().equals(name)) { |
| 73 | jsonBuilder.addNodeTopHalf(name, JsonNodeType.ARRAY); |
| 74 | } |
| 75 | jsonBuilder.addNodeTopHalf(EMPTY, JsonNodeType.OBJECT); |
| 76 | break; |
| 77 | case SINGLE_INSTANCE_LEAF_VALUE_NODE: |
| 78 | jsonBuilder.addNodeWithValueTopHalf(name, ydtContext.getValue()); |
| 79 | break; |
| 80 | case MULTI_INSTANCE_LEAF_VALUE_NODE: |
| 81 | jsonBuilder.addNodeWithSetTopHalf(name, ydtContext.getValueSet()); |
| 82 | break; |
| 83 | default: |
| 84 | throw new YdtParseException("unknown Ydt type " + |
| 85 | ydtContext.getYdtType()); |
| 86 | } |
| 87 | |
| 88 | } |
| 89 | |
| 90 | @Override |
| 91 | public void exitYdtNode(YdtContext ydtContext) { |
| 92 | |
| 93 | if (!isBegin) { |
| 94 | return; |
| 95 | } |
| 96 | |
| 97 | String curName = ydtContext.getName(); |
| 98 | YdtContext nextNode = ydtContext.getNextSibling(); |
| 99 | switch (ydtContext.getYdtType()) { |
| 100 | |
| 101 | case SINGLE_INSTANCE_NODE: |
| 102 | jsonBuilder.addNodeBottomHalf(JsonNodeType.OBJECT); |
| 103 | break; |
| 104 | case MULTI_INSTANCE_NODE: |
| 105 | if (nextNode == null || !nextNode.getName().equals(curName)) { |
| 106 | jsonBuilder.addNodeBottomHalf(JsonNodeType.OBJECT); |
| 107 | jsonBuilder.addNodeBottomHalf(JsonNodeType.ARRAY); |
| 108 | } else { |
| 109 | jsonBuilder.addNodeBottomHalf(JsonNodeType.OBJECT); |
| 110 | } |
| 111 | break; |
| 112 | case SINGLE_INSTANCE_LEAF_VALUE_NODE: |
| 113 | jsonBuilder.addNodeBottomHalf(JsonNodeType.STRING); |
| 114 | break; |
| 115 | case MULTI_INSTANCE_LEAF_VALUE_NODE: |
| 116 | jsonBuilder.addNodeBottomHalf(JsonNodeType.ARRAY); |
| 117 | break; |
| 118 | default: |
| 119 | throw new YdtParseException("Unknown Ydt type " + |
| 120 | ydtContext.getYdtType()); |
| 121 | } |
| 122 | if (curName.equals(rootName) && |
| 123 | (nextNode == null || !nextNode.getName().equals(rootName))) { |
| 124 | isBegin = false; |
| 125 | } |
| 126 | } |
| 127 | } |