Java ClassLoader Load getReader(final String name, final String encoding)

Description

get Reader

License

Apache License

Declaration

public static Reader getReader(final String name, final String encoding) throws IOException 

Method Source Code

//package com.java2s;
/*/*from   w w w.  java2 s . c  o m*/
 * Copyright 2016 Christoph B?hme
 *
 * 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.
 */

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;

import java.net.URL;

public class Main {
    public static Reader getReader(final String name) throws FileNotFoundException {
        return new InputStreamReader(getStream(name));
    }

    public static Reader getReader(final File file) throws FileNotFoundException {
        return new InputStreamReader(getStream(file));
    }

    public static Reader getReader(final String name, final String encoding) throws IOException {
        return new InputStreamReader(getStream(name), encoding);
    }

    public static Reader getReader(final File file, final String encoding) throws IOException {
        return new InputStreamReader(getStream(file), encoding);
    }

    /**
     * First attempts to open open {@code name} as a file. On fail attempts to
     * open resource with name {@code name}. On fail attempts to open {@code name}
     * as a URL.
     *
     * @param name name of the file or resource to open
     * @return an input stream for reading the opened file or resource
     * @throws FileNotFoundException if all attempts fail
     */
    public static InputStream getStream(final String name) throws FileNotFoundException {
        if (name == null) {
            throw new IllegalArgumentException("'name' must not be null");
        }
        final File file = new File(name);
        if (file.exists()) {
            return getStream(file);
        }

        InputStream stream = Thread.currentThread().getContextClassLoader().getResourceAsStream(name);
        if (stream != null) {
            return stream;
        }

        try {
            stream = new URL(name).openStream();
        } catch (final IOException e) {
            throwFileNotFoundException(name, e);
        }
        if (stream == null) {
            throwFileNotFoundException(name, null);
        }

        return stream;

    }

    public static InputStream getStream(final File file) throws FileNotFoundException {
        return new FileInputStream(file);
    }

    private static void throwFileNotFoundException(final String name, final Throwable t)
            throws FileNotFoundException {
        final FileNotFoundException e = new FileNotFoundException("No file, resource or URL found: " + name);
        if (t != null) {
            e.initCause(t);
        }
        throw e;
    }
}

Related

1. getPath(final String fileName)
2. getPath(String resoureLocation)
3. getProhibitedProxyInterfaces()
4. getProperties(String bundleName, String fileName)
5. getProperty(String propertyName)
6. getRootPath()
7. getSimpleName(String fqcn)
8. getSourcesPath()
9. getSSTable(String version, int generation)