gerrit.fd Code Review - hc2vpp.git/blob

   1 /*
   2  * Copyright (c) 2016 Cisco and/or its affiliates.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 package io.fd.honeycomb.v3po.translate.util.write;
  18
  19 import static com.google.common.base.Preconditions.checkArgument;
  20
  21 import io.fd.honeycomb.v3po.translate.util.RWUtils;
  22 import io.fd.honeycomb.v3po.translate.write.WriteContext;
  23 import io.fd.honeycomb.v3po.translate.write.WriteFailedException;
  24 import io.fd.honeycomb.v3po.translate.write.Writer;
  25 import javax.annotation.Nonnull;
  26 import javax.annotation.Nullable;
  27 import org.opendaylight.yangtools.yang.binding.DataObject;
  28 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  29 import org.slf4j.Logger;
  30 import org.slf4j.LoggerFactory;
  31
  32 public abstract class AbstractGenericWriter<D extends DataObject> implements Writer<D> {
  33
  34     private static final Logger LOG = LoggerFactory.getLogger(AbstractGenericWriter.class);
  35
  36     private final InstanceIdentifier<D> instanceIdentifier;
  37
  38     protected AbstractGenericWriter(final InstanceIdentifier<D> type) {
  39         this.instanceIdentifier = RWUtils.makeIidWildcarded(type);
  40     }
  41
  42     protected void writeCurrent(final InstanceIdentifier<D> id, final D data, final WriteContext ctx)
  43         throws WriteFailedException {
  44         LOG.debug("{}: Writing current: {} data: {}", this, id, data);
  45         writeCurrentAttributes(id, data, ctx);
  46         LOG.debug("{}: Current node written successfully", this);
  47     }
  48
  49     protected void updateCurrent(final InstanceIdentifier<D> id, final D dataBefore, final D dataAfter,
  50                                  final WriteContext ctx) throws WriteFailedException {
  51         LOG.debug("{}: Updating current: {} dataBefore: {}, datAfter: {}", this, id, dataBefore, dataAfter);
  52
  53         if (dataBefore.equals(dataAfter)) {
  54             LOG.debug("{}: Skipping current(no update): {}", this, id);
  55             // No change, ignore
  56             return;
  57         }
  58         updateCurrentAttributes(id, dataBefore, dataAfter, ctx);
  59         LOG.debug("{}: Current node updated successfully", this);
  60     }
  61
  62     protected void deleteCurrent(final InstanceIdentifier<D> id, final D dataBefore, final WriteContext ctx)
  63         throws WriteFailedException {
  64         LOG.debug("{}: Deleting current: {} dataBefore: {}", this, id, dataBefore);
  65         deleteCurrentAttributes(id, dataBefore, ctx);
  66     }
  67
  68     @SuppressWarnings("unchecked")
  69     @Override
  70     public void update(@Nonnull final InstanceIdentifier<? extends DataObject> id,
  71                        @Nullable final DataObject dataBefore,
  72                        @Nullable final DataObject dataAfter,
  73                        @Nonnull final WriteContext ctx) throws WriteFailedException {
  74         LOG.debug("{}: Updating : {}", this, id);
  75         LOG.trace("{}: Updating : {}, from: {} to: {}", this, id, dataBefore, dataAfter);
  76
  77         checkArgument(idPointsToCurrent(id), "Cannot handle data: %s. Only: %s can be handled by writer: %s",
  78                 id, getManagedDataObjectType(), this);
  79
  80         if (isWrite(dataBefore, dataAfter)) {
  81             writeCurrent((InstanceIdentifier<D>) id, castToManaged(dataAfter), ctx);
  82         } else if (isDelete(dataBefore, dataAfter)) {
  83             deleteCurrent((InstanceIdentifier<D>) id, castToManaged(dataBefore), ctx);
  84         } else {
  85             checkArgument(dataBefore != null && dataAfter != null, "No data to process");
  86             updateCurrent((InstanceIdentifier<D>) id, castToManaged(dataBefore), castToManaged(dataAfter), ctx);
  87         }
  88     }
  89
  90     private void checkDataType(@Nonnull final DataObject dataAfter) {
  91         checkArgument(getManagedDataObjectType().getTargetType().isAssignableFrom(dataAfter.getClass()));
  92     }
  93
  94     private D castToManaged(final DataObject data) {
  95         checkDataType(data);
  96         return getManagedDataObjectType().getTargetType().cast(data);
  97     }
  98
  99     private static boolean isWrite(final DataObject dataBefore,
 100                                     final DataObject dataAfter) {
 101         return dataBefore == null && dataAfter != null;
 102     }
 103
 104     private static boolean isDelete(final DataObject dataBefore,
 105                                     final DataObject dataAfter) {
 106         return dataAfter == null && dataBefore != null;
 107     }
 108
 109     private boolean idPointsToCurrent(final @Nonnull InstanceIdentifier<? extends DataObject> id) {
 110         return id.getTargetType().equals(getManagedDataObjectType().getTargetType());
 111     }
 112
 113     protected abstract void writeCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
 114                                                    @Nonnull final D data,
 115                                                    @Nonnull final WriteContext ctx) throws WriteFailedException;
 116
 117     protected abstract void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
 118                                                     @Nonnull final D dataBefore,
 119                                                     @Nonnull final WriteContext ctx) throws WriteFailedException;
 120
 121     protected abstract void updateCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
 122                                                     @Nonnull final D dataBefore,
 123                                                     @Nonnull final D dataAfter,
 124                                                     @Nonnull final WriteContext ctx) throws WriteFailedException;
 125
 126     @Nonnull
 127     @Override
 128     public InstanceIdentifier<D> getManagedDataObjectType() {
 129         return instanceIdentifier;
 130     }
 131
 132
 133     @Override
 134     public String toString() {
 135         return String.format("Writer[%s]", getManagedDataObjectType().getTargetType().getSimpleName());
 136     }
 137 }