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      * @param leafRefPath leafRefPath
  30      * @param contextNodeSchemaPath contextNodeSchemaPath
  31      * @param module module
  32      * @return LeafRefPath object
  33      */
  34     public static LeafRefPath createAbsoluteLeafRefPath(
  35             final LeafRefPath leafRefPath, final SchemaPath contextNodeSchemaPath,
  36             final Module module) {
  37
  38         if (leafRefPath.isAbsolute()) {
  39             return leafRefPath;
  40         }
  41
  42         final Deque<QNameWithPredicate> absoluteLeafRefTargetPathList = schemaPathToXPathQNames(
  43                 contextNodeSchemaPath, module);
  44
  45         final Iterable<QNameWithPredicate> leafRefTargetPathFromRoot = leafRefPath
  46                 .getPathFromRoot();
  47         final Iterator<QNameWithPredicate> leafRefTgtPathFromRootIterator = leafRefTargetPathFromRoot
  48                 .iterator();
  49
  50         while (leafRefTgtPathFromRootIterator.hasNext()) {
  51             final QNameWithPredicate qname = leafRefTgtPathFromRootIterator.next();
  52             if (qname.equals(QNameWithPredicate.UP_PARENT)) {
  53                 absoluteLeafRefTargetPathList.removeLast();
  54             } else {
  55                 absoluteLeafRefTargetPathList.add(qname);
  56             }
  57         }
  58
  59         return LeafRefPath.create(absoluteLeafRefTargetPathList, true);
  60     }
  61
  62     /**
  63      * @param currentNodePath
  64      * @param module
  65      * @param absoluteLeafRefTargetPathList
  66      */
  67     private static Deque<QNameWithPredicate> schemaPathToXPathQNames(
  68             final SchemaPath nodePath, final Module module) {
  69
  70         final Deque<QNameWithPredicate> xpath = new LinkedList<>();
  71
  72         final Iterator<QName> nodePathIterator = nodePath.getPathFromRoot()
  73                 .iterator();
  74
  75         DataNodeContainer currenDataNodeContainer = module;
  76         while (nodePathIterator.hasNext()) {
  77             final QName qname = nodePathIterator.next();
  78             final DataSchemaNode child = currenDataNodeContainer
  79                     .getDataChildByName(qname);
  80
  81             if (child instanceof DataNodeContainer) {
  82                 if (!(child instanceof ChoiceCaseNode)) {
  83                     final QNameWithPredicate newQName = new QNameWithPredicateBuilder(
  84                             qname.getModule(), qname.getLocalName()).build();
  85                     xpath.add(newQName);
  86                 }
  87                 currenDataNodeContainer = (DataNodeContainer) child;
  88             } else if (child instanceof ChoiceSchemaNode) {
  89                 if (nodePathIterator.hasNext()) {
  90                     currenDataNodeContainer = ((ChoiceSchemaNode) child)
  91                             .getCaseNodeByName(nodePathIterator.next());
  92                 } else {
  93                     break;
  94                 }
  95             } else if (child instanceof LeafSchemaNode
  96                     || child instanceof LeafListSchemaNode) {
  97
  98                 final QNameWithPredicate newQName = new QNameWithPredicateBuilder(
  99                         qname.getModule(), qname.getLocalName()).build();
 100                 xpath.add(newQName);
 101                 break;
 102
 103             } else if (child == null) {
 104                 throw new IllegalArgumentException("No child " + qname
 105                         + " found in node container " + currenDataNodeContainer
 106                         + " in module " + module.getName());
 107             } else {
 108                 throw new IllegalStateException(
 109                         "Illegal schema node type in the path: "
 110                                 + child.getClass());
 111             }
 112         }
 113
 114         return xpath;
 115     }
 116
 117     public static LeafRefPath schemaPathToLeafRefPath(final SchemaPath nodePath,
 118             final Module module) {
 119         final Deque<QNameWithPredicate> xpathQNames = schemaPathToXPathQNames(
 120                 nodePath, module);
 121         return LeafRefPath.create(xpathQNames, true);
 122     }
 123
 124 }