eagle-core/eagle-query/eagle-entity-base/src/main/java/org/apache/eagle/log/entity/meta/Qualifier.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.eagle.log.entity.meta;

import org.apache.hadoop.io.Writable;
import com.fasterxml.jackson.annotation.JsonIgnore;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

public class Qualifier implements Writable {
    private static final Logger LOG = LoggerFactory.getLogger(Qualifier.class);

    private String displayName;
    private String qualifierName;
    private EntitySerDeser<Object> serDeser;

    @JsonIgnore
    public EntitySerDeser<Object> getSerDeser() {
        return serDeser;
    }

    public void setSerDeser(EntitySerDeser<Object> serDeser) {
        this.serDeser = serDeser;
    }

    public String getDisplayName() {
        return displayName;
    }

    public void setDisplayName(String displayName) {
        this.displayName = displayName;
    }

    public String getQualifierName() {
        return qualifierName;
    }

    public void setQualifierName(String qualifierName) {
        this.qualifierName = qualifierName;
    }

    @Override
    public String toString() {
        StringBuffer sb = new StringBuffer();
        sb.append("displayName:");
        sb.append(displayName);
        sb.append(",");
        sb.append("qualifierName:");
        sb.append(qualifierName);
        sb.append(",");
        sb.append("serDeser class:");
        sb.append(serDeser.getClass().getName());
        return sb.toString();
    }

    @Override
    public void write(DataOutput out) throws IOException {
        out.writeUTF(displayName);
        out.writeUTF(qualifierName);
        out.writeUTF(serDeser.getClass().getName());
    }

    private static final Map<String, EntitySerDeser> _entitySerDeserCache = new HashMap<String, EntitySerDeser>();

    @Override
    public void readFields(DataInput in) throws IOException {
        displayName = in.readUTF();
        qualifierName = in.readUTF();
        String serDeserClassName = in.readUTF();

        EntitySerDeser _cached = _entitySerDeserCache.get(serDeserClassName);
        if (_cached != null) {
            this.serDeser = _cached;
        } else {
            try {
                if (LOG.isDebugEnabled()) {
                    LOG.debug("Creating new instance for " + serDeserClassName);
                }
                Class serDeserClass = Class.forName(serDeserClassName);
                this.serDeser = (EntitySerDeser)serDeserClass.newInstance();
                _entitySerDeserCache.put(serDeserClassName, this.serDeser);
            } catch (Exception e) {
                if (LOG.isDebugEnabled()) {
                    LOG.warn("Class not found for " + serDeserClassName + ": " + e.getMessage(), e);
                }
            }
        }
    }
}