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.impl.write;
  18
  19 import static com.google.common.base.Preconditions.checkArgument;
  20
  21 import io.fd.honeycomb.v3po.translate.write.WriteContext;
  22 import io.fd.honeycomb.v3po.translate.write.WriteFailedException;
  23 import io.fd.honeycomb.v3po.translate.write.Writer;
  24 import javax.annotation.Nonnull;
  25 import javax.annotation.Nullable;
  26 import org.opendaylight.yangtools.yang.binding.DataObject;
  27 import org.opendaylight.yangtools.yang.binding.InstanceIdentifier;
  28 import org.slf4j.Logger;
  29 import org.slf4j.LoggerFactory;
  30
  31 abstract class AbstractCompositeWriter<D extends DataObject> implements Writer<D> {
  32
  33     private static final Logger LOG = LoggerFactory.getLogger(AbstractCompositeWriter.class);
  34
  35     private final InstanceIdentifier<D> instanceIdentifier;
  36
  37     AbstractCompositeWriter(final InstanceIdentifier<D> type) {
  38         this.instanceIdentifier = type;
  39     }
  40
  41     protected void writeCurrent(final InstanceIdentifier<D> id, final D data, final WriteContext ctx)
  42         throws WriteFailedException {
  43         LOG.debug("{}: Writing current: {} data: {}", this, id, data);
  44         writeCurrentAttributes(id, data, ctx);
  45         LOG.debug("{}: Current node written successfully", this);
  46     }
  47
  48     protected void updateCurrent(final InstanceIdentifier<D> id, final D dataBefore, final D dataAfter,
  49                                  final WriteContext ctx) throws WriteFailedException {
  50         LOG.debug("{}: Updating current: {} dataBefore: {}, datAfter: {}", this, id, dataBefore, dataAfter);
  51
  52         if (dataBefore.equals(dataAfter)) {
  53             LOG.debug("{}: Skipping current(no update): {}", this, id);
  54             // No change, ignore
  55             return;
  56         }
  57         updateCurrentAttributes(id, dataBefore, dataAfter, ctx);
  58         LOG.debug("{}: Current node updated successfully", this);
  59     }
  60
  61     protected void deleteCurrent(final InstanceIdentifier<D> id, final D dataBefore, final WriteContext ctx)
  62         throws WriteFailedException {
  63         LOG.debug("{}: Deleting current: {} dataBefore: {}", this, id, dataBefore);
  64         deleteCurrentAttributes(id, dataBefore, ctx);
  65     }
  66
  67     @SuppressWarnings("unchecked")
  68     @Override
  69     public void update(@Nonnull final InstanceIdentifier<? extends DataObject> id,
  70                        @Nullable final DataObject dataBefore,
  71                        @Nullable final DataObject dataAfter,
  72                        @Nonnull final WriteContext ctx) throws WriteFailedException {
  73         LOG.debug("{}: Updating : {}", this, id);
  74         LOG.trace("{}: Updating : {}, from: {} to: {}", this, id, dataBefore, dataAfter);
  75
  76         checkArgument(idPointsToCurrent(id), "Cannot handle data: %s. Only: %s can be handled by writer: %s",
  77                 id, getManagedDataObjectType(), this);
  78
  79         if (isWrite(dataBefore, dataAfter)) {
  80             writeCurrent((InstanceIdentifier<D>) id, castToManaged(dataAfter), ctx);
  81         } else if (isDelete(dataBefore, dataAfter)) {
  82             deleteCurrent((InstanceIdentifier<D>) id, castToManaged(dataBefore), ctx);
  83         } else {
  84             checkArgument(dataBefore != null && dataAfter != null, "No data to process");
  85             updateCurrent((InstanceIdentifier<D>) id, castToManaged(dataBefore), castToManaged(dataAfter), ctx);
  86         }
  87     }
  88
  89     private void checkDataType(@Nonnull final DataObject dataAfter) {
  90         checkArgument(getManagedDataObjectType().getTargetType().isAssignableFrom(dataAfter.getClass()));
  91     }
  92
  93     private D castToManaged(final DataObject data) {
  94         checkDataType(data);
  95         return getManagedDataObjectType().getTargetType().cast(data);
  96     }
  97
  98     private static boolean isWrite(final DataObject dataBefore,
  99                                     final DataObject dataAfter) {
 100         return dataBefore == null && dataAfter != null;
 101     }
 102
 103     private static boolean isDelete(final DataObject dataBefore,
 104                                     final DataObject dataAfter) {
 105         return dataAfter == null && dataBefore != null;
 106     }
 107
 108     private boolean idPointsToCurrent(final @Nonnull InstanceIdentifier<? extends DataObject> id) {
 109         return id.getTargetType().equals(getManagedDataObjectType().getTargetType());
 110     }
 111
 112     protected abstract void writeCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
 113                                                    @Nonnull final D data,
 114                                                    @Nonnull final WriteContext ctx) throws WriteFailedException;
 115
 116     protected abstract void deleteCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
 117                                                     @Nonnull final D dataBefore,
 118                                                     @Nonnull final WriteContext ctx) throws WriteFailedException;
 119
 120     protected abstract void updateCurrentAttributes(@Nonnull final InstanceIdentifier<D> id,
 121                                                     @Nonnull final D dataBefore,
 122                                                     @Nonnull final D dataAfter,
 123                                                     @Nonnull final WriteContext ctx) throws WriteFailedException;
 124
 125     @Nonnull
 126     @Override
 127     public InstanceIdentifier<D> getManagedDataObjectType() {
 128         return instanceIdentifier;
 129     }
 130
 131
 132     @Override
 133     public String toString() {
 134         return String.format("Writer[%s]", getManagedDataObjectType().getTargetType().getSimpleName());
 135     }
 136 }