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