package com.matthewmitchell.peercoinj.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();
}
}