Java Formatter Usage append(final CharSequence seq, final Formatter formatter, final int flags, final int width, final int precision)

Description

Handles the common Formattable operations of truncate-pad-append, with no ellipsis on precision overflow, and padding width underflow with spaces.

License

Apache License

Parameter

Parameter	Description
seq	the string to handle, not null
formatter	the destination formatter, not null
flags	the flags for formatting, see Formattable
width	the width of the output, see Formattable
precision	the precision of the output, see Formattable

Return

the formatter instance, not null

Declaration

public static Formatter append(final CharSequence seq, final Formatter formatter, final int flags,
        final int width, final int precision) 

Method Source Code

//package com.java2s;
/*/*from w  ww .  j ava  2 s  . c  om*/
 * 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.
 */

import java.util.Formattable;
import java.util.Formatter;
import static java.util.FormattableFlags.LEFT_JUSTIFY;

public class Main {
    /**
     * A format that simply outputs the value as a string.
     */
    private static final String SIMPLEST_FORMAT = "%s";

    /**
     * Handles the common {@code Formattable} operations of truncate-pad-append,
     * with no ellipsis on precision overflow, and padding width underflow with
     * spaces.
     *
     * @param seq  the string to handle, not null
     * @param formatter  the destination formatter, not null
     * @param flags  the flags for formatting, see {@code Formattable}
     * @param width  the width of the output, see {@code Formattable}
     * @param precision  the precision of the output, see {@code Formattable}
     * @return the {@code formatter} instance, not null
     */
    public static Formatter append(final CharSequence seq, final Formatter formatter, final int flags,
            final int width, final int precision) {
        return append(seq, formatter, flags, width, precision, ' ', null);
    }

    /**
     * Handles the common {@link Formattable} operations of truncate-pad-append,
     * with no ellipsis on precision overflow.
     *
     * @param seq  the string to handle, not null
     * @param formatter  the destination formatter, not null
     * @param flags  the flags for formatting, see {@code Formattable}
     * @param width  the width of the output, see {@code Formattable}
     * @param precision  the precision of the output, see {@code Formattable}
     * @param padChar  the pad character to use
     * @return the {@code formatter} instance, not null
     */
    public static Formatter append(final CharSequence seq, final Formatter formatter, final int flags,
            final int width, final int precision, final char padChar) {
        return append(seq, formatter, flags, width, precision, padChar, null);
    }

    /**
     * Handles the common {@link Formattable} operations of truncate-pad-append,
     * padding width underflow with spaces.
     *
     * @param seq  the string to handle, not null
     * @param formatter  the destination formatter, not null
     * @param flags  the flags for formatting, see {@code Formattable}
     * @param width  the width of the output, see {@code Formattable}
     * @param precision  the precision of the output, see {@code Formattable}
     * @param ellipsis  the ellipsis to use when precision dictates truncation, null or
     *  empty causes a hard truncation
     * @return the {@code formatter} instance, not null
     */
    public static Formatter append(final CharSequence seq, final Formatter formatter, final int flags,
            final int width, final int precision, final CharSequence ellipsis) {
        return append(seq, formatter, flags, width, precision, ' ', ellipsis);
    }

    /**
     * Handles the common {@link Formattable} operations of truncate-pad-append.
     *
     * @param seq  the string to handle, not null
     * @param formatter  the destination formatter, not null
     * @param flags  the flags for formatting, see {@code Formattable}
     * @param width  the width of the output, see {@code Formattable}
     * @param precision  the precision of the output, see {@code Formattable}
     * @param padChar  the pad character to use
     * @param ellipsis  the ellipsis to use when precision dictates truncation, null or
     *  empty causes a hard truncation
     * @return the {@code formatter} instance, not null
     */
    public static Formatter append(final CharSequence seq, final Formatter formatter, final int flags,
            final int width, final int precision, final char padChar, final CharSequence ellipsis) {
        if (!(ellipsis == null || precision < 0 || ellipsis.length() <= precision)) {
            throw new IllegalArgumentException(String.format("Specified ellipsis '%1$s' exceeds precision of %2$s",
                    ellipsis, Integer.valueOf(precision)));
        }
        final StringBuilder buf = new StringBuilder(seq);
        if (precision >= 0 && precision < seq.length()) {
            final CharSequence _ellipsis;
            if (ellipsis == null) {
                _ellipsis = "";
            } else {
                _ellipsis = ellipsis;
            }
            buf.replace(precision - _ellipsis.length(), seq.length(), _ellipsis.toString());
        }
        final boolean leftJustify = (flags & LEFT_JUSTIFY) == LEFT_JUSTIFY;
        for (int i = buf.length(); i < width; i++) {
            buf.insert(leftJustify ? i : 0, padChar);
        }
        formatter.format(buf.toString());
        return formatter;
    }

    /**
     * Get the default formatted representation of the specified
     * {@code Formattable}.
     *
     * @param formattable  the instance to convert to a string, not null
     * @return the resulting string, not null
     */
    public static String toString(final Formattable formattable) {
        return String.format(SIMPLEST_FORMAT, formattable);
    }
}

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3. assertion(final boolean test, final String fmt, final Object... params)
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5. byteArray2Hex(byte[] hash)