public static IJSONPair findByPath(IJSONDocument document, String[] segments) {
   IJSONNode parent = document.getFirstChild();
   IJSONPair pair = null;
   for (int i = 0; i < segments.length; i++) {
     pair = findByPath(parent, segments[i]);
     if (pair != null) {
       parent = pair.getValue();
     }
   }
   return pair;
 }
 public static Object getValue(IStructuredDocument document, IJSONPath path) {
   IJSONModel model = null;
   try {
     model = (IJSONModel) StructuredModelManager.getModelManager().getModelForRead(document);
     IJSONPair pair = findByPath(model.getDocument(), path.getSegments());
     if (pair != null) {
       IJSONValue value = pair.getValue();
       return getValue(value);
     }
   } finally {
     if (model != null) {
       model.releaseFromRead();
     }
   }
   return null;
 }
  private static int getEndOffset(IJSONNode parent, boolean inside) {
    if (parent == null) {
      return 0;
    }
    switch (parent.getNodeType()) {
      case IJSONNode.OBJECT_NODE:
        if (parent.hasChildNodes()) {
          IJSONNode lastChild = parent.getLastChild();
          boolean childInside =
              inside
                  && (isSimpleValue(lastChild)
                      || (lastChild.getNodeType() == IJSONNode.PAIR_NODE
                          && isSimpleValue(((IJSONPair) lastChild).getValue())));
          return getEndOffset(lastChild, childInside);
        }
        return parent.getStartOffset() + (inside ? 1 : 0);
      case IJSONNode.PAIR_NODE:
        if (!inside) {
          return parent.getEndOffset();
        }

        IJSONPair pair = (IJSONPair) parent;
        IJSONValue value = (IJSONValue) pair.getValue();
        if (value != null) {
          return getEndOffset(value, false);
        }
        return pair.getEndOffset();
      case IJSONNode.VALUE_BOOLEAN_NODE:
      case IJSONNode.VALUE_NULL_NODE:
      case IJSONNode.VALUE_NUMBER_NODE:
      case IJSONNode.VALUE_STRING_NODE:
        return parent.getStartOffset()
            + parent.getFirstStructuredDocumentRegion().getFirstRegion().getLength();
      default:
        return parent.getEndOffset();
    }
  }
  public static void setValue(IStructuredDocument document, IJSONPath path, Object value) {
    IJSONModel model = null;
    try {
      model = (IJSONModel) StructuredModelManager.getModelManager().getModelForEdit(document);
      IJSONNode parent = model.getDocument().getFirstChild();
      String[] segments = path.getSegments();
      String name = null;
      int replaceOffset = 0;
      int replaceLength = 0;
      boolean isArray = false;
      int startIndex = NO_START_INDEX;
      StringBuilder newContent = new StringBuilder();
      for (int i = 0; i < segments.length; i++) {
        name = segments[i];
        isArray = isArray(path, i);
        IJSONPair node = findByPath(parent, name);
        if (node != null) {
          parent = node;
          IJSONNode jsonValue = node.getValue();
          if (isObject(jsonValue)) {
            parent = jsonValue;
            replaceOffset = getEndOffset(parent, true);
          } else {
            if (jsonValue != null) {
              replaceOffset = jsonValue.getStartOffset();
              replaceLength =
                  isArray(jsonValue)
                      ? jsonValue.getEndStructuredDocumentRegion().getEndOffset()
                          - jsonValue.getFirstStructuredDocumentRegion().getStartOffset()
                      : jsonValue.getFirstStructuredDocumentRegion().getFirstRegion().getLength();
            }
          }
        } else {
          if (isObjectOrArray(parent)) {
            replaceOffset = getEndOffset(parent, true);
            if (parent.hasChildNodes()) {
              newContent.append(",");
            }
          } else {
            newContent.append(isArray ? "[" : "{");
            if (startIndex == NO_START_INDEX) {
              startIndex = i - 1;
            }
          }
          newLineAndIndent(i, newContent);
          newContent.append("\"");
          newContent.append(name);
          newContent.append("\": ");
          parent = null;
        }
      }

      addValue(value, newContent);

      if (startIndex != NO_START_INDEX) {
        // close JSON object or Array
        for (int i = segments.length - 1; i > startIndex; i--) {
          if (i == -1) {
            newLineAndIndent(0, newContent);
            newContent.append("}");
          } else {
            name = segments[i];
            isArray = isArray(path, i);
            newLineAndIndent(i - 1, newContent);
            newContent.append(isArray ? "]" : "}");
          }
        }
      }
      document.replaceText(document, replaceOffset, replaceLength, newContent.toString());
    } finally {
      if (model != null) {
        model.releaseFromEdit();
      }
    }
  }