restconf/restconf-nb-rfc8040/src/main/java/org/opendaylight/restconf/nb/rfc8040/rests/utils/DeleteDataTransactionUtil.java

   1 /*
   2  * Copyright (c) 2016 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.restconf.nb.rfc8040.rests.utils;
   9
  10 import com.google.common.util.concurrent.FluentFuture;
  11 import javax.ws.rs.core.Response;
  12 import javax.ws.rs.core.Response.Status;
  13 import org.opendaylight.mdsal.common.api.CommitInfo;
  14 import org.opendaylight.mdsal.common.api.LogicalDatastoreType;
  15 import org.opendaylight.restconf.common.errors.RestconfDocumentedException;
  16 import org.opendaylight.restconf.common.errors.RestconfError.ErrorTag;
  17 import org.opendaylight.restconf.common.errors.RestconfError.ErrorType;
  18 import org.opendaylight.restconf.nb.rfc8040.rests.transactions.RestconfStrategy;
  19 import org.opendaylight.yangtools.yang.data.api.YangInstanceIdentifier;
  20 import org.slf4j.Logger;
  21 import org.slf4j.LoggerFactory;
  22
  23 /**
  24  * Util class for delete specific data in config DS.
  25  */
  26 public final class DeleteDataTransactionUtil {
  27     private static final Logger LOG = LoggerFactory.getLogger(DeleteDataTransactionUtil.class);
  28     private static final String DELETE_TX_TYPE = "DELETE";
  29
  30     private DeleteDataTransactionUtil() {
  31         throw new UnsupportedOperationException("Util class.");
  32     }
  33
  34     /**
  35      * Delete data from DS via transaction.
  36      *
  37      * @param strategy object that perform the actual DS operations
  38      * @return {@link Response}
  39      */
  40     public static Response deleteData(final RestconfStrategy strategy, final YangInstanceIdentifier path) {
  41         strategy.prepareReadWriteExecution();
  42         checkItemExists(strategy, LogicalDatastoreType.CONFIGURATION, path, DELETE_TX_TYPE);
  43         strategy.delete(LogicalDatastoreType.CONFIGURATION, path);
  44         final FluentFuture<? extends CommitInfo> future = strategy.commit();
  45         final ResponseFactory response = new ResponseFactory(Status.NO_CONTENT);
  46         //This method will close transactionChain if any
  47         FutureCallbackTx.addCallback(future, DELETE_TX_TYPE, response, strategy.getTransactionChain());
  48         return response.build();
  49     }
  50
  51     /**
  52      * Check if items already exists at specified {@code path}. Throws {@link RestconfDocumentedException} if
  53      * data does NOT already exists.
  54      *
  55      * @param strategy      Object that perform the actual DS operations
  56      * @param store         Datastore
  57      * @param path          Path to be checked
  58      * @param operationType Type of operation (READ, POST, PUT, DELETE...)
  59      */
  60     private static void checkItemExists(final RestconfStrategy strategy,
  61                                         final LogicalDatastoreType store, final YangInstanceIdentifier path,
  62                                         final String operationType) {
  63         final FluentFuture<Boolean> future = strategy.exists(store, path);
  64         final FutureDataFactory<Boolean> response = new FutureDataFactory<>();
  65
  66         FutureCallbackTx.addCallback(future, operationType, response);
  67
  68         if (!response.result) {
  69             // close transaction
  70             strategy.cancel();
  71             // throw error
  72             LOG.trace("Operation via Restconf was not executed because data at {} does not exist", path);
  73             throw new RestconfDocumentedException(
  74                     "Data does not exist", ErrorType.PROTOCOL, ErrorTag.DATA_MISSING, path);
  75         }
  76     }
  77 }