diff options
Diffstat (limited to 'infra/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/read/AbstractGenericReader.java')
-rw-r--r-- | infra/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/read/AbstractGenericReader.java | 90 |
1 files changed, 90 insertions, 0 deletions
diff --git a/infra/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/read/AbstractGenericReader.java b/infra/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/read/AbstractGenericReader.java new file mode 100644 index 000000000..9bfbc2450 --- /dev/null +++ b/infra/translate-utils/src/main/java/io/fd/honeycomb/v3po/translate/util/read/AbstractGenericReader.java @@ -0,0 +1,90 @@ +/* + * Copyright (c) 2016 Cisco and/or its affiliates. + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at: + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package io.fd.honeycomb.v3po.translate.util.read; + +import static com.google.common.base.Preconditions.checkArgument; + +import com.google.common.annotations.Beta; +import com.google.common.base.Optional; +import io.fd.honeycomb.v3po.translate.read.ReadContext; +import io.fd.honeycomb.v3po.translate.read.ReadFailedException; +import io.fd.honeycomb.v3po.translate.read.Reader; +import io.fd.honeycomb.v3po.translate.util.RWUtils; +import javax.annotation.Nonnull; +import org.opendaylight.yangtools.concepts.Builder; +import org.opendaylight.yangtools.yang.binding.DataObject; +import org.opendaylight.yangtools.yang.binding.InstanceIdentifier; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +@Beta +public abstract class AbstractGenericReader<D extends DataObject, B extends Builder<D>> implements Reader<D, B> { + + private static final Logger LOG = LoggerFactory.getLogger(AbstractGenericReader.class); + + private final InstanceIdentifier<D> instanceIdentifier; + + protected AbstractGenericReader(final InstanceIdentifier<D> managedDataObjectType) { + this.instanceIdentifier = RWUtils.makeIidWildcarded(managedDataObjectType); + } + + @Nonnull + @Override + public final InstanceIdentifier<D> getManagedDataObjectType() { + return instanceIdentifier; + } + + /** + * @param id {@link InstanceIdentifier} pointing to current node. In case of keyed list, key must be present. + * + */ + protected Optional<D> readCurrent(@Nonnull final InstanceIdentifier<D> id, + @Nonnull final ReadContext ctx) throws ReadFailedException { + LOG.debug("{}: Reading current: {}", this, id); + final B builder = getBuilder(id); + // Cache empty value to determine if anything has changed later TODO cache in a field + final D emptyValue = builder.build(); + + LOG.trace("{}: Reading current attributes", this); + readCurrentAttributes(id, builder, ctx); + + // Need to check whether anything was filled in to determine if data is present or not. + final D built = builder.build(); + final Optional<D> read = built.equals(emptyValue) + ? Optional.absent() + : Optional.of(built); + + LOG.debug("{}: Current node read successfully. Result: {}", this, read); + return read; + } + + @Nonnull + @Override + @SuppressWarnings("unchecked") + public Optional<? extends DataObject> read(@Nonnull final InstanceIdentifier<? extends DataObject> id, + @Nonnull final ReadContext ctx) + throws ReadFailedException { + LOG.trace("{}: Reading : {}", this, id); + checkArgument(id.getTargetType().equals(getManagedDataObjectType().getTargetType())); + return readCurrent((InstanceIdentifier<D>) id, ctx); + } + + @Override + public String toString() { + return String.format("Reader[%s]", getManagedDataObjectType().getTargetType().getSimpleName()); + } +} |