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

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Here is the source code for com.cloudera.hadoop.hdfs.nfs.nfs4.handlers.CREATEHandler.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.Bitmap;
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.Attribute;
import com.cloudera.hadoop.hdfs.nfs.nfs4.requests.CREATERequest;
import com.cloudera.hadoop.hdfs.nfs.nfs4.responses.CREATEResponse;
import com.google.common.collect.ImmutableMap;
import org.apache.log4j.Logger;

public class CREATEHandler extends OperationRequestHandler<CREATERequest, CREATEResponse> {

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

    @Override
    protected CREATEResponse doHandle(NFS4Handler server, Session session, CREATERequest request)
            throws NFS4Exception, IOException {
        if (session.getCurrentFileHandle() == null) {
            throw new NFS4Exception(NFS4ERR_NOFILEHANDLE);
        }
        if (request.getType() != NFS4_DIR) {
            throw new UnsupportedOperationException(
                    "Create files of  type " + request.getType() + " is not supported.");
        }
        if ("".equals(request.getName())) {
            throw new NFS4Exception(NFS4ERR_INVAL);
        }
        Path parent = server.getPath(session.getCurrentFileHandle());
        Path path = new Path(parent, request.getName());
        FileSystem fs = session.getFileSystem();
        if (!fs.exists(parent)) {
            throw new NFS4Exception(NFS4ERR_STALE, "Parent " + parent + " does not exist");
        }
        if (fs.exists(path)) {
            throw new NFS4Exception(NFS4ERR_EXIST, "Path " + path + " already exists.");
        }
        long parentModTimeBefore = fs.getFileStatus(parent).getModificationTime();
        if (!fs.mkdirs(path)) {
            throw new NFS4Exception(NFS4ERR_IO);
        }
        long parentModTimeAfter = fs.getFileStatus(parent).getModificationTime();
        FileStatus fileStatus = fs.getFileStatus(path);
        ImmutableMap<Integer, Attribute> requestAttrs = request.getAttrValues();
        // TODO Handlers should have annotations so that setAttrs can throw an
        // error if they require the stateID to be set. 
        Bitmap responseAttrs = Attribute.setAttrs(server, session, request.getAttrs(), requestAttrs, fs, fileStatus,
                null);
        session.setCurrentFileHandle(server.createFileHandle(path));
        CREATEResponse response = createResponse();
        response.setChangeInfo(ChangeInfo.newChangeInfo(true, parentModTimeBefore, parentModTimeAfter));
        response.setStatus(NFS4_OK);
        response.setAttrs(responseAttrs);
        return response;
    }

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