com.kylinolap.dict.lookup.FileTable.java Source code

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Here is the source code for com.kylinolap.dict.lookup.FileTable.java

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/*
 * Copyright 2013-2014 eBay Software Foundation
 *
 * Licensed 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.kylinolap.dict.lookup;

import java.io.IOException;

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

import com.kylinolap.common.util.HadoopUtil;

/**
 * @author yangli9
 * 
 */
public class FileTable implements ReadableTable {

    String path;
    String delim;
    int nColumns;

    public FileTable(String path, int nColumns) {
        this(path, ReadableTable.DELIM_AUTO, nColumns);
    }

    public FileTable(String path, String delim, int nColumns) {
        this.path = path;
        this.delim = delim;
        this.nColumns = nColumns;
    }

    @Override
    public String getColumnDelimeter() {
        return delim;
    }

    @Override
    public TableReader getReader() throws IOException {
        return new FileTableReader(path, delim, nColumns);
    }

    @Override
    public TableSignature getSignature() throws IOException {
        FileSystem fs = HadoopUtil.getFileSystem(path);
        FileStatus status = fs.getFileStatus(new Path(path));
        return new TableSignature(path, status.getLen(), status.getModificationTime());
    }

    @Override
    public String toString() {
        return path;
    }
}