uk.gov.gchq.gaffer.bitmap.serialisation.json.RoaringBitmapJsonDeserialiser Maven / Gradle / Ivy
/*
* Copyright 2017-2020 Crown Copyright
*
* 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 uk.gov.gchq.gaffer.bitmap.serialisation.json;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.TreeNode;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;
import com.fasterxml.jackson.databind.node.TextNode;
import org.roaringbitmap.RoaringBitmap;
import uk.gov.gchq.gaffer.bitmap.serialisation.RoaringBitmapSerialiser;
import java.io.IOException;
/**
* Custom deserialisation logic for {@link RoaringBitmap} instances.
*/
public class RoaringBitmapJsonDeserialiser extends JsonDeserializer {
private final RoaringBitmapSerialiser bitmapSerialiser = new RoaringBitmapSerialiser();
@Override
public RoaringBitmap deserialize(final JsonParser jsonParser, final DeserializationContext deserializationContext) throws IOException {
final TreeNode treeNode = jsonParser.getCodec().readTree(jsonParser);
final TreeNode bitmapObject = treeNode.get(RoaringBitmapConstants.BITMAP_WRAPPER_OBJECT_NAME);
if (null != bitmapObject) {
final TextNode jsonNodes = (TextNode) bitmapObject.get(RoaringBitmapConstants.BITMAP_VALUE_FIELD_NAME);
return (RoaringBitmap) bitmapSerialiser.deserialise(jsonNodes.binaryValue());
} else {
throw new IllegalArgumentException("Received null bitmap treenode");
}
}
}