yang/yang-data-impl/src/main/java/org/opendaylight/yangtools/yang/data/impl/leafref/LeafRefUtils.java

   1 /*
   2  * Copyright (c) 2015 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8 package org.opendaylight.yangtools.yang.data.impl.leafref;
   9
  10 import java.util.Deque;
  11 import java.util.Iterator;
  12 import java.util.LinkedList;
  13 import org.opendaylight.yangtools.yang.common.QName;
  14 import org.opendaylight.yangtools.yang.model.api.ChoiceCaseNode;
  15 import org.opendaylight.yangtools.yang.model.api.ChoiceSchemaNode;
  16 import org.opendaylight.yangtools.yang.model.api.DataNodeContainer;
  17 import org.opendaylight.yangtools.yang.model.api.DataSchemaNode;
  18 import org.opendaylight.yangtools.yang.model.api.LeafListSchemaNode;
  19 import org.opendaylight.yangtools.yang.model.api.LeafSchemaNode;
  20 import org.opendaylight.yangtools.yang.model.api.Module;
  21 import org.opendaylight.yangtools.yang.model.api.SchemaPath;
  22
  23 public final class LeafRefUtils {
  24     private LeafRefUtils() {
  25         throw new UnsupportedOperationException();
  26     }
  27
  28     /**
  29      * Create an absolute leafref path.
  30      *
  31      * @param leafRefPath leafRefPath
  32      * @param contextNodeSchemaPath contextNodeSchemaPath
  33      * @param module module
  34      * @return LeafRefPath object
  35      */
  36     public static LeafRefPath createAbsoluteLeafRefPath(
  37             final LeafRefPath leafRefPath, final SchemaPath contextNodeSchemaPath,
  38             final Module module) {
  39
  40         if (leafRefPath.isAbsolute()) {
  41             return leafRefPath;
  42         }
  43
  44         final Deque<QNameWithPredicate> absoluteLeafRefTargetPathList = schemaPathToXPathQNames(
  45                 contextNodeSchemaPath, module);
  46         final Iterator<QNameWithPredicate> leafRefTgtPathFromRootIterator = leafRefPath.getPathFromRoot().iterator();
  47
  48         while (leafRefTgtPathFromRootIterator.hasNext()) {
  49             final QNameWithPredicate qname = leafRefTgtPathFromRootIterator.next();
  50             if (qname.equals(QNameWithPredicate.UP_PARENT)) {
  51                 absoluteLeafRefTargetPathList.removeLast();
  52             } else {
  53                 absoluteLeafRefTargetPathList.add(qname);
  54             }
  55         }
  56
  57         return LeafRefPath.create(absoluteLeafRefTargetPathList, true);
  58     }
  59
  60     private static Deque<QNameWithPredicate> schemaPathToXPathQNames(
  61             final SchemaPath nodePath, final Module module) {
  62
  63         final Deque<QNameWithPredicate> xpath = new LinkedList<>();
  64
  65         final Iterator<QName> nodePathIterator = nodePath.getPathFromRoot()
  66                 .iterator();
  67
  68         DataNodeContainer currenDataNodeContainer = module;
  69         while (nodePathIterator.hasNext()) {
  70             final QName qname = nodePathIterator.next();
  71             final DataSchemaNode child = currenDataNodeContainer
  72                     .getDataChildByName(qname);
  73
  74             if (child instanceof DataNodeContainer) {
  75                 if (!(child instanceof ChoiceCaseNode)) {
  76                     final QNameWithPredicate newQName = new QNameWithPredicateBuilder(
  77                             qname.getModule(), qname.getLocalName()).build();
  78                     xpath.add(newQName);
  79                 }
  80                 currenDataNodeContainer = (DataNodeContainer) child;
  81             } else if (child instanceof ChoiceSchemaNode) {
  82                 if (nodePathIterator.hasNext()) {
  83                     currenDataNodeContainer = ((ChoiceSchemaNode) child)
  84                             .getCaseNodeByName(nodePathIterator.next());
  85                 } else {
  86                     break;
  87                 }
  88             } else if (child instanceof LeafSchemaNode
  89                     || child instanceof LeafListSchemaNode) {
  90
  91                 final QNameWithPredicate newQName = new QNameWithPredicateBuilder(
  92                         qname.getModule(), qname.getLocalName()).build();
  93                 xpath.add(newQName);
  94                 break;
  95
  96             } else if (child == null) {
  97                 throw new IllegalArgumentException("No child " + qname
  98                         + " found in node container " + currenDataNodeContainer
  99                         + " in module " + module.getName());
 100             } else {
 101                 throw new IllegalStateException(
 102                         "Illegal schema node type in the path: "
 103                                 + child.getClass());
 104             }
 105         }
 106
 107         return xpath;
 108     }
 109
 110     public static LeafRefPath schemaPathToLeafRefPath(final SchemaPath nodePath, final Module module) {
 111         return LeafRefPath.create(schemaPathToXPathQNames(nodePath, module), true);
 112     }
 113 }