001    /**
002     * Licensed to the Apache Software Foundation (ASF) under one
003     * or more contributor license agreements.  See the NOTICE file
004     * distributed with this work for additional information
005     * regarding copyright ownership.  The ASF licenses this file
006     * to you under the Apache License, Version 2.0 (the
007     * "License"); you may not use this file except in compliance
008     * with the License.  You may obtain a copy of the License at
009     *
010     *     http://www.apache.org/licenses/LICENSE-2.0
011     *
012     * Unless required by applicable law or agreed to in writing, software
013     * distributed under the License is distributed on an "AS IS" BASIS,
014     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015     * See the License for the specific language governing permissions and
016     * limitations under the License.
017     */
018    package org.apache.hadoop.hdfs.web.resources;
019    
020    import org.apache.hadoop.fs.permission.FsPermission;
021    
022    /** Permission parameter, use a Short to represent a FsPermission. */
023    public class PermissionParam extends ShortParam {
024      /** Parameter name. */
025      public static final String NAME = "permission";
026      /** Default parameter value. */
027      public static final String DEFAULT = NULL;
028    
029      private static final Domain DOMAIN = new Domain(NAME, 8);
030    
031      private static final short DEFAULT_PERMISSION = 0755;
032    
033      /** @return the default FsPermission. */
034      public static FsPermission getDefaultFsPermission() {
035        return new FsPermission(DEFAULT_PERMISSION);
036      }
037      
038      /**
039       * Constructor.
040       * @param value the parameter value.
041       */
042      public PermissionParam(final FsPermission value) {
043        super(DOMAIN, value == null? null: value.toShort(), null, null);
044      }
045    
046      /**
047       * Constructor.
048       * @param str a string representation of the parameter value.
049       */
050      public PermissionParam(final String str) {
051        super(DOMAIN, DOMAIN.parse(str), (short)0, (short)01777);
052      }
053    
054      @Override
055      public String getName() {
056        return NAME;
057      }
058    
059      /** @return the represented FsPermission. */
060      public FsPermission getFsPermission() {
061        final Short v = getValue();
062        return new FsPermission(v != null? v: DEFAULT_PERMISSION);
063      }
064    }