Java Byte Array to String by Charset getNumberOfBytesPerCharacter(final String charsetName)

Description

Returns the number of bytes per character in the given charset.

License

Apache License

Parameter

Parameter	Description
charsetName	a charset name.

Return

the number of fixed-width bytes per character in the charset or -1 if charset is variable-width.

Declaration

public static int getNumberOfBytesPerCharacter(final String charsetName) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;

public class Main {
    /**/*  w ww.  jav a2  s .c om*/
     * Returns the number of bytes per character in the given charset.
     * 
     * @param charsetName a charset name.
     * @return the number of fixed-width bytes per character in the charset or -1 if charset is variable-width.
     */
    public static int getNumberOfBytesPerCharacter(final String charsetName) {
        if (!isFixedWith(charsetName)) {
            return -1;
        }

        final Charset charset = Charset.forName(charsetName);
        final CharsetEncoder encoder = charset.newEncoder();
        return (int) encoder.maxBytesPerChar();
    }

    /**
     * Returns whether the given charset is fixed-width.
     * 
     * @param charsetName a charset name.
     * @return true if the charset is fixed-width, false if the charset is variable-width.
     */
    public static boolean isFixedWith(final String charsetName) {
        checkNotNull(charsetName, "Argument charsetName must not be null.");
        checkArgument(Charset.isSupported(charsetName), "Charset '%s' is not supported.", charsetName);

        final Charset charset = Charset.forName(charsetName);
        final CharsetEncoder encoder = charset.newEncoder();
        return encoder.averageBytesPerChar() == encoder.maxBytesPerChar();
    }
}

Related

1. getBytesUnchecked(String string, String charsetName)
2. getBytesUnchecked(String string, String charsetName)
3. getChars(byte[] data, String charset)
4. getContentAsString(byte[] content, Charset charset)
5. getMaxBytes(String string, int maxBytes, Charset charSet)
6. getPrefixWithMaxBytes(String string, int maxBytes, Charset charSet)
7. getRowId(final byte[] rowId, final Charset charset, final boolean base64encodeValues)
8. getString(@Nonnull byte[] b, @Nonnegative int bufferSize, @Nonnegative int offset, @Nonnull Charset charset)
9. getString(byte[] bytes, String charset)