/*
* Copyright by the original author or authors.
*
* 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 org.bitcoinj.utils;
import com.google.common.collect.Maps;
import com.google.protobuf.ByteString;
import javax.annotation.Nullable;
import java.util.HashMap;
import java.util.Map;
import static com.google.common.base.Preconditions.checkNotNull;
/**
* A simple implementation of {@link TaggableObject} that just uses a lazily created hashmap that is
* synchronized on this objects Java monitor.
*/
public class BaseTaggableObject implements TaggableObject {
@Nullable protected Map<String, ByteString> tags;
/** {@inheritDoc} */
@Override
@Nullable
public synchronized ByteString maybeGetTag(String tag) {
if (tags == null)
return null;
else
return tags.get(tag);
}
/** {@inheritDoc} */
@Override
public ByteString getTag(String tag) {
ByteString b = maybeGetTag(tag);
if (b == null)
throw new IllegalArgumentException("Unknown tag " + tag);
return b;
}
/** {@inheritDoc} */
@Override
public synchronized void setTag(String tag, ByteString value) {
checkNotNull(tag);
checkNotNull(value);
if (tags == null)
tags = new HashMap<String, ByteString>();
tags.put(tag, value);
}
/** {@inheritDoc} */
@Override
public synchronized Map<String, ByteString> getTags() {
if (tags != null)
return Maps.newHashMap(tags);
else
return Maps.newHashMap();
}
}