com.yahoo.io.reader.NamedReader Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of vespajlib Show documentation

Library for use in Java components of Vespa. Shared code which do not fit anywhere else.

There is a newer version: 8.409.18

// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.io.reader;

import com.yahoo.api.annotations.Beta;

import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
import java.nio.CharBuffer;
import java.util.List;

/**
 * A reader with a name. All reader methods are delegated to the wrapped reader.
 *
 * @author bratseth
 */
@Beta
public class NamedReader extends Reader {

    private final String name;
    private final Reader reader;

    public NamedReader(String name, Reader reader) {
        this.name = name;
        this.reader = reader;
    }

    public String getName() { return name; }

    public Reader getReader() { return reader; }

    /** Returns the name */
    @Override
    public String toString() {
        return name;
    }

    // The rest is reader method implementations which delegates to the wrapped reader
    public static Reader nullReader() { return new NamedReader("nullReader", Reader.nullReader()); }
    @Override
    public int read(CharBuffer charBuffer) throws IOException { return reader.read(charBuffer); }
    @Override
    public int read() throws IOException { return reader.read(); }
    @Override
    public int read(char[] chars) throws IOException { return reader.read(chars); }
    @Override
    public int read(char[] chars, int i, int i1) throws IOException { return reader.read(chars,i,i1); }
    @Override
    public long skip(long l) throws IOException { return reader.skip(l); }
    @Override
    public boolean ready() throws IOException { return reader.ready(); }
    @Override
    public boolean markSupported() { return reader.markSupported(); }
    @Override
    public void mark(int i) throws IOException { reader.mark(i); }
    @Override
    public void reset() throws IOException { reader.reset(); }
    @Override
    public void close() throws IOException { reader.close(); }
    @Override
    public long transferTo(Writer out) throws IOException { return reader.transferTo(out); }

    /** Convenience method for closing a list of readers. Does nothing if the given reader list is null. */
    public static void closeAll(List readers) {
        if (readers==null) return;
        for (Reader reader : readers) {
            try {
                reader.close();
            }
            catch (IOException e) {
                // Nothing to do about it
            }
        }
    }

}