org.apache.drill.exec.store.ClassPathFileSystem.java Source code

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Here is the source code for org.apache.drill.exec.store.ClassPathFileSystem.java

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/**
 * 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 org.apache.drill.exec.store;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;

import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.fs.permission.FsPermission;
import org.apache.hadoop.util.Progressable;

import com.google.common.io.Resources;

public class ClassPathFileSystem extends FileSystem {
    static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(ClassPathFileSystem.class);

    static final String ERROR_MSG = "ClassPathFileSystem is read only.";

    private Path working;

    @Override
    public FSDataOutputStream append(Path arg0, int arg1, Progressable arg2) throws IOException {
        throw new IOException(ERROR_MSG);
    }

    @Override
    public FSDataOutputStream create(Path arg0, FsPermission arg1, boolean arg2, int arg3, short arg4, long arg5,
            Progressable arg6) throws IOException {
        throw new IOException(ERROR_MSG);
    }

    @Override
    public boolean delete(Path arg0) throws IOException {
        throw new IOException(ERROR_MSG);
    }

    @Override
    public boolean delete(Path arg0, boolean arg1) throws IOException {
        throw new IOException(ERROR_MSG);
    }

    private String getFileName(Path path) {
        String file = path.toUri().getPath();
        if (file.charAt(0) == '/') {
            file = file.substring(1);
        }
        return file;
    }

    @Override
    public FileStatus getFileStatus(Path arg0) throws IOException {
        String file = getFileName(arg0);
        URL url;

        try {
            url = Resources.getResource(file);
        } catch (IllegalArgumentException e) {
            throw new FileNotFoundException(String.format("Unable to find path %s.", arg0.toString()));
        }

        return new FileStatus(Resources.asByteSource(url).size(), false, 1, 8096, System.currentTimeMillis(), arg0);
    }

    @Override
    public URI getUri() {
        try {
            return new URI("classpath:///");
        } catch (URISyntaxException e) {
            throw new RuntimeException(e);
        }
    }

    @Override
    public Path getWorkingDirectory() {
        return working;
    }

    @Override
    public FileStatus[] listStatus(Path arg0) throws IOException {
        throw new UnsupportedOperationException("ClassPathFileSystem doesn't currently support listing files.");
    }

    @Override
    public boolean mkdirs(Path arg0, FsPermission arg1) throws IOException {
        throw new IOException(ERROR_MSG);
    }

    @Override
    public FSDataInputStream open(Path arg0, int arg1) throws IOException {
        String file = getFileName(arg0);
        URL url = Resources.getResource(file);
        if (url == null) {
            throw new IOException(String.format("Unable to find path %s.", arg0.getName()));
        }
        ResourceInputStream ris = new ResourceInputStream(Resources.toByteArray(url));
        return new FSDataInputStream(ris);
    }

    @Override
    public boolean rename(Path arg0, Path arg1) throws IOException {
        throw new IOException(ERROR_MSG);
    }

    @Override
    public void setWorkingDirectory(Path arg0) {
        this.working = arg0;
    }

    public static void main(String[] args) throws Exception {
        URI uri = new URI("classpath:///");
    }
}