stack/core/src/main/java/org/apache/usergrid/corepersistence/pipeline/cursor/AbstractCursorSerializer.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.usergrid.corepersistence.pipeline.cursor;


import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;


/**
 * Abstract serializer other serializers should inherit from makes serialization easier
 */
public abstract class AbstractCursorSerializer<T> implements CursorSerializer<T> {


    /**
     * Intentionally protected.  Subclasses should be singletons
     */
    protected AbstractCursorSerializer() {

    }


    @Override
    public T fromJsonNode( final JsonNode node, final ObjectMapper objectMapper ) {
        try {
            final Class<? extends T> classType = getType();

             return objectMapper.treeToValue( node, classType );
        }
        catch ( JsonProcessingException e ) {
            throw new CursorParseException( "Unable to deserialize value", e );
        }
    }


    @Override
    public JsonNode toNode( final ObjectMapper objectMapper, final T value ) {
        return objectMapper.valueToTree( value );
    }


    protected abstract Class<? extends T> getType();
}