// Copyright 2017 JanusGraph 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.janusgraph.diskstorage.indexing;
import com.google.common.base.Preconditions;
import org.janusgraph.diskstorage.EntryMetaData;
import org.janusgraph.diskstorage.MetaAnnotatable;
import org.janusgraph.diskstorage.MetaAnnotated;
import org.apache.commons.lang.StringUtils;
import java.util.Map;
/**
* An index entry is a key-value pair (or field-value pair).
*
* @author Matthias Broecheler (me@matthiasb.com)
*/
public class IndexEntry implements MetaAnnotated, MetaAnnotatable {
public final String field;
public final Object value;
public IndexEntry(final String field, final Object value) {
this(field, value, null);
}
public IndexEntry(final String field, final Object value, Map<EntryMetaData, Object> metadata) {
Preconditions.checkNotNull(field);
Preconditions.checkNotNull(value);
Preconditions.checkArgument(StringUtils.isNotBlank(field));
this.field = field;
this.value = value;
if (metadata == null || metadata == EntryMetaData.EMPTY_METADATA)
return;
for (Map.Entry<EntryMetaData, Object> e : metadata.entrySet())
setMetaData(e.getKey(), e.getValue());
}
//########## META DATA ############
//copied from StaticArrayEntry
private Map<EntryMetaData,Object> metadata = EntryMetaData.EMPTY_METADATA;
@Override
public synchronized Object setMetaData(EntryMetaData key, Object value) {
if (metadata == EntryMetaData.EMPTY_METADATA)
metadata = new EntryMetaData.Map();
return metadata.put(key,value);
}
@Override
public boolean hasMetaData() {
return !metadata.isEmpty();
}
@Override
public Map<EntryMetaData,Object> getMetaData() {
return metadata;
}
}