com.cloudera.flume.handlers.avro.AvroEventAdaptor.java Source code

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Here is the source code for com.cloudera.flume.handlers.avro.AvroEventAdaptor.java

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/**
 * Licensed to Cloudera, Inc. under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  Cloudera, Inc. 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 com.cloudera.flume.handlers.avro;

import java.nio.ByteBuffer;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import org.apache.commons.lang.NotImplementedException;
import org.apache.commons.lang.StringEscapeUtils;
import com.cloudera.flume.core.Event;
import com.cloudera.flume.core.EventImpl;
import com.google.common.base.Preconditions;

/**
 * This wraps a Avro generated AvroFlumeEvent with a Flume Event interface.
 */
class AvroEventAdaptor extends Event {
    AvroFlumeEvent evt = null;

    AvroEventAdaptor(AvroFlumeEvent evt) {
        super();
        this.evt = evt;
    }

    @Override
    public byte[] getBody() {
        return evt.body.array();
    }

    @Override
    public Priority getPriority() {
        return convert(evt.priority);
    }

    @Override
    public long getTimestamp() {
        return evt.timestamp;
    }

    public static Priority convert(com.cloudera.flume.handlers.avro.Priority p) {
        Preconditions.checkNotNull(p, "Prioirity argument must be valid.");
        switch (p) {
        case FATAL:
            return Priority.FATAL;
        case ERROR:
            return Priority.ERROR;
        case WARN:
            return Priority.WARN;
        case INFO:
            return Priority.INFO;
        case DEBUG:
            return Priority.DEBUG;
        case TRACE:
            return Priority.TRACE;
        default:
            throw new IllegalStateException("Unknown value " + p);
        }
    }

    public static com.cloudera.flume.handlers.avro.Priority convert(Priority p) {
        Preconditions.checkNotNull(p, "Argument must not be null.");
        switch (p) {
        case FATAL:
            return com.cloudera.flume.handlers.avro.Priority.FATAL;
        case ERROR:
            return com.cloudera.flume.handlers.avro.Priority.ERROR;
        case WARN:
            return com.cloudera.flume.handlers.avro.Priority.WARN;
        case INFO:
            return com.cloudera.flume.handlers.avro.Priority.INFO;
        case DEBUG:
            return com.cloudera.flume.handlers.avro.Priority.DEBUG;
        case TRACE:
            return com.cloudera.flume.handlers.avro.Priority.TRACE;
        default:
            throw new IllegalStateException("Unknown value " + p);
        }
    }

    @Override
    public String toString() {
        String mbody = StringEscapeUtils.escapeJava(new String(getBody()));
        return "[" + getPriority().toString() + " " + new Date(getTimestamp()) + "] " + mbody;
    }

    @Override
    public long getNanos() {
        return evt.nanos;
    }

    @Override
    public String getHost() {
        return evt.host.toString();
    }

    public static AvroFlumeEvent convert(Event e) {
        AvroFlumeEvent tempAvroEvt = new AvroFlumeEvent();

        tempAvroEvt.timestamp = e.getTimestamp();
        tempAvroEvt.priority = convert(e.getPriority());
        ByteBuffer bbuf = ByteBuffer.wrap(e.getBody());

        tempAvroEvt.body = bbuf;
        tempAvroEvt.nanos = e.getNanos();
        tempAvroEvt.host = e.getHost();

        tempAvroEvt.fields = new HashMap<CharSequence, ByteBuffer>();
        for (String s : e.getAttrs().keySet()) {
            // wrap a ByteBuffer around e.getAttrs().get(s)
            // also note that e.getAttrs().get(s) is immutable
            ByteBuffer temp = ByteBuffer.wrap(e.getAttrs().get(s));
            tempAvroEvt.fields.put(s, temp);
        }
        return tempAvroEvt;
    }

    /**
     * This returns the FlumEvent corresponding to the AvroEvent passed in the
     * constructor of this object.
     */
    public Event toFlumeEvent() {
        Preconditions.checkNotNull(evt, "AvroFlumeEvent is not initialized");
        return new EventImpl(this.getBody(), this.getTimestamp(), this.getPriority(), this.getNanos(),
                this.getHost(), this.getAttrs());
    }

    @Override
    public byte[] get(String attr) {
        return evt.fields.get(attr).array();
    }

    @Override
    public Map<String, byte[]> getAttrs() {
        if (evt.fields == null) {
            return Collections.<String, byte[]>emptyMap();
        }
        HashMap<String, byte[]> tempMap = new HashMap<String, byte[]>();
        for (CharSequence u : evt.fields.keySet()) {
            tempMap.put(u.toString(), evt.fields.get(u).array());
        }
        return tempMap;
    }

    @Override
    public void set(String attr, byte[] value) {
        if (evt.fields.get(attr) != null) {
            throw new IllegalArgumentException("Event already had an event with attribute " + attr);
        }
        ByteBuffer bbuf = ByteBuffer.wrap(value);
        evt.fields.put(attr, bbuf);
    }

    @Override
    public void hierarchicalMerge(String prefix, Event e) {
        throw new NotImplementedException();
    }

    @Override
    public void merge(Event e) {
        throw new NotImplementedException();
    }
}