com.cloudera.hadoop.hdfs.nfs.nfs4.handlers.REMOVEHandler.java Source code

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Here is the source code for com.cloudera.hadoop.hdfs.nfs.nfs4.handlers.REMOVEHandler.java

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/**
 * Copyright 2011 The Apache Software Foundation
 *
 * 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 com.cloudera.hadoop.hdfs.nfs.nfs4.handlers;

import static com.cloudera.hadoop.hdfs.nfs.nfs4.Constants.*;

import java.io.IOException;

import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

import com.cloudera.hadoop.hdfs.nfs.nfs4.ChangeInfo;
import com.cloudera.hadoop.hdfs.nfs.nfs4.NFS4Exception;
import com.cloudera.hadoop.hdfs.nfs.nfs4.NFS4Handler;
import com.cloudera.hadoop.hdfs.nfs.nfs4.Session;
import com.cloudera.hadoop.hdfs.nfs.nfs4.attrs.ChangeID;
import com.cloudera.hadoop.hdfs.nfs.nfs4.requests.REMOVERequest;
import com.cloudera.hadoop.hdfs.nfs.nfs4.responses.REMOVEResponse;
import org.apache.log4j.Logger;

public class REMOVEHandler extends OperationRequestHandler<REMOVERequest, REMOVEResponse> {

    protected static final Logger LOGGER = Logger.getLogger(REMOVEHandler.class);

    @Override
    protected REMOVEResponse doHandle(NFS4Handler server, Session session, REMOVERequest request)
            throws NFS4Exception, IOException {
        if (session.getCurrentFileHandle() == null) {
            throw new NFS4Exception(NFS4ERR_NOFILEHANDLE);
        }
        if ("".equals(request.getName())) {
            throw new NFS4Exception(NFS4ERR_INVAL);
        }
        Path parentPath = server.getPath(session.getCurrentFileHandle());
        Path path = new Path(parentPath, request.getName());
        FileSystem fs = session.getFileSystem();
        if (!fs.exists(path)) {
            throw new NFS4Exception(NFS4ERR_NOENT);
        }
        REMOVEResponse response = createResponse();
        ChangeInfo changeInfo = new ChangeInfo();
        FileStatus parentStatus = fs.getFileStatus(parentPath);
        ChangeID changeIDBefore = new ChangeID();
        changeIDBefore.setChangeID(parentStatus.getModificationTime());
        changeInfo.setChangeIDBefore(changeIDBefore);

        fs.delete(path, false);

        parentStatus = fs.getFileStatus(parentPath);
        ChangeID changeIDAfter = new ChangeID();
        changeIDAfter.setChangeID(parentStatus.getModificationTime());
        changeInfo.setChangeIDAfter(changeIDAfter);
        changeInfo.setAtomic(true);
        response.setChangeInfo(changeInfo);
        response.setStatus(NFS4_OK);
        return response;
    }

    @Override
    protected REMOVEResponse createResponse() {
        return new REMOVEResponse();
    }
}