Java Locale Format format(int[] a)

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  5. format(int[] a)

Description

Formats the int array a for printing purposes.

License

Open Source License

Parameter

Parameter Description
a the int array to be formatted

Return

a String representing the int array a

Declaration 

public static String format(int[] a)

Method Source Code


//package com.java2s;
/*/*w  w w  .j a  v a2  s . c om*/
 This file is part of ELKI:
 Environment for Developing KDD-Applications Supported by Index-Structures
    
 Copyright (C) 2015
 Ludwig-Maximilians-Universit?t M?nchen
 Lehr- und Forschungseinheit f?r Datenbanksysteme
 ELKI Development Team
    
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU Affero General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.
    
 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU Affero General Public License for more details.
    
 You should have received a copy of the GNU Affero General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.NumberFormat;

import java.util.Collection;

import java.util.Iterator;

import java.util.Locale;

public class Main {
    /**
     * Number Formatter (2 digits) for output purposes.
     */
    public static final NumberFormat NF2 = NumberFormat.getInstance(Locale.US);
    /**
     * Whitespace. The string should cover the commonly used length.
     */
    private static final String WHITESPACE_BUFFER = "                                                                                ";
    /**
     * Length of the whitespace buffer.
     */
    private static final int WHITESPACE_BUFFER_LENGTH = WHITESPACE_BUFFER.length();

    /**
     * Formats the double array d with ', ' as separator and default precision.
     *
     * @param d the double array to be formatted
     * @return a String representing the double array d
     */
    public static String format(double[] d) {
        return d == null ? "null" : (d.length == 0) ? "" : //
                formatTo(new StringBuilder(), d, ", ").toString();
    }

    /**
     * Formats the double array d with the specified separator.
     *
     * @param d the double array to be formatted
     * @param sep separator between the single values of the array, e.g. ','
     * @return a String representing the double array d
     */
    public static String format(double[] d, String sep) {
        return d == null ? "null" : (d.length == 0) ? "" : //
                formatTo(new StringBuilder(), d, sep).toString();
    }

    /**
     * Formats the double array d with the specified number format.
     *
     * @param d the double array to be formatted
     * @param nf the number format to be used for formatting
     * @return a String representing the double array d
     */
    public static String format(double[] d, NumberFormat nf) {
        return format(d, " ", nf);
    }

    /**
     * Formats the double array d with the specified number format.
     *
     * @param d the double array to be formatted
     * @param sep separator between the single values of the array, e.g. ','
     * @param nf the number format to be used for formatting
     * @return a String representing the double array d
     */
    public static String format(double[] d, String sep, NumberFormat nf) {
        return d == null ? "null" : (d.length == 0) ? "" : //
                formatTo(new StringBuilder(), d, sep, nf).toString();
    }

    /**
     * Returns a string representation of this vector.
     *
     * @param w column width
     * @param d number of digits after the decimal
     * @return a string representation of this matrix
     */
    public static String format(double[] v, int w, int d) {
        DecimalFormat format = new DecimalFormat();
        format.setDecimalFormatSymbols(new DecimalFormatSymbols(Locale.US));
        format.setMinimumIntegerDigits(1);
        format.setMaximumFractionDigits(d);
        format.setMinimumFractionDigits(d);
        format.setGroupingUsed(false);

        int width = w + 1;
        StringBuilder msg = new StringBuilder();
        msg.append('\n'); // start on new line.
        for (int i = 0; i < v.length; i++) {
            String s = format.format(v[i]); // format the number
            int padding = Math.max(1, width - s.length()); // At _least_ 1
            // space
            for (int k = 0; k < padding; k++) {
                msg.append(' ');
            }
            msg.append(s);
        }
        // msg.append("\n");

        return msg.toString();
    }

    /**
     * Formats the float array d with the specified number format.
     *
     * @param d the float array to be formatted
     * @param sep separator between the single values of the array, e.g. ','
     * @param nf the number format to be used for formatting
     * @return a String representing the double array d
     */
    public static String format(float[] d, String sep, NumberFormat nf) {
        return (d == null) ? "null" : (d.length == 0) ? "" : //
                formatTo(new StringBuilder(), d, sep, nf).toString();
    }

    /**
     * Formats the float array d with the specified number format.
     *
     * @param d the float array to be formatted
     * @param sep separator between the single values of the array, e.g. ','
     * @param nf the number format to be used for formatting
     * @return a String representing the double array d
     */
    public static String format(float[] d, String sep) {
        return (d == null) ? "null" : (d.length == 0) ? "" : //
                formatTo(new StringBuilder(), d, sep).toString();
    }

    /**
     * Formats the float array f with ',' as separator and default precision.
     *
     * @param f the float array to be formatted
     * @return a String representing the float array f
     */
    public static String format(float[] f) {
        return (f == null) ? "null" : (f.length == 0) ? "" : //
                formatTo(new StringBuilder(), f, ", ").toString();
    }

    /**
     * Formats the int array a for printing purposes.
     * 
     * @param a the int array to be formatted
     * @param sep the separator between the single values of the array, e.g. ','
     * @return a String representing the int array a
     */
    public static String format(int[] a, String sep) {
        return (a == null) ? "null" : (a.length == 0) ? "" : //
                formatTo(new StringBuilder(), a, sep).toString();
    }

    /**
     * Formats the int array a for printing purposes.
     *
     * @param a the int array to be formatted
     * @return a String representing the int array a
     */
    public static String format(int[] a) {
        return (a == null) ? "null" : (a.length == 0) ? "" : //
                formatTo(new StringBuilder(), a, ", ").toString();
    }

    /**
     * Formats the long array a for printing purposes.
     *
     * @param a the long array to be formatted
     * @return a String representing the long array a
     */
    public static String format(long[] a) {
        return (a == null) ? "null" : (a.length == 0) ? "" : //
                formatTo(new StringBuilder(), a, ", ").toString();
    }

    /**
     * Formats the byte array a for printing purposes.
     *
     * @param a the byte array to be formatted
     * @return a String representing the byte array a
     */
    public static String format(byte[] a) {
        return (a == null) ? "null" : (a.length == 0) ? "" : //
                formatTo(new StringBuilder(), a, ", ").toString();
    }

    /**
     * Formats the boolean array b with ',' as separator.
     *
     * @param b the boolean array to be formatted
     * @param sep separator between the single values of the array, e.g. ','
     * @return a String representing the boolean array b
     */
    public static String format(boolean[] b, final String sep) {
        return (b == null) ? "null" : (b.length == 0) ? "" : //
                formatTo(new StringBuilder(), b, ", ").toString();
    }

    /**
     * Formats the boolean b.
     *
     * @param b the boolean to be formatted
     * @return a String representing of the boolean b
     */
    public static String format(final boolean b) {
        return b ? "1" : "0";
    }

    /**
     * Formats the double array d with ',' as separator and 2 fraction digits.
     *
     * @param d the double array to be formatted
     * @return a String representing the double array d
     */
    public static String format(double[][] d) {
        return d == null ? "null" : (d.length == 0) ? "[]" : //
                formatTo(new StringBuilder().append("[\n"), d, " [", "]\n", ", ", NF2).append(']').toString();
    }

    /**
     * Formats the array of double arrays d with 'the specified separators and
     * fraction digits.
     *
     * @param d the double matrix to be formatted
     * @param pre Row prefix (e.g. " [")
     * @param pos Row postfix (e.g. "]\n")
     * @param csep Separator for columns (e.g. ", ")
     * @param nf the number format to use
     * @return a String representing the double array d
     */
    public static String format(double[][] d, String pre, String pos, String csep, NumberFormat nf) {
        return d == null ? "null" : (d.length == 0) ? "" : //
                formatTo(new StringBuilder(), d, pre, pos, csep, nf).toString();
    }

    /**
     * Returns a string representation of this matrix.
     *
     * @param w column width
     * @param d number of digits after the decimal
     * @param pre Row prefix (e.g. " [")
     * @param pos Row postfix (e.g. "]\n")
     * @param csep Column separator (e.g. ", ")
     * @return a string representation of this matrix
     */
    public static String format(double[][] m, int w, int d, String pre, String pos, String csep) {
        DecimalFormat format = new DecimalFormat();
        format.setDecimalFormatSymbols(new DecimalFormatSymbols(Locale.US));
        format.setMinimumIntegerDigits(1);
        format.setMaximumFractionDigits(d);
        format.setMinimumFractionDigits(d);
        format.setGroupingUsed(false);

        StringBuilder msg = new StringBuilder();
        for (int i = 0; i < m.length; i++) {
            double[] row = m[i];
            msg.append(pre);
            for (int j = 0; j < row.length; j++) {
                if (j > 0) {
                    msg.append(csep);
                }
                String s = format.format(row[j]); // format the number
                whitespace(msg, w - s.length());
                msg.append(s);
            }
            msg.append(pos);
        }
        return msg.toString();
    }

    /**
     * Returns a string representation of this matrix. In each line the specified
     * String <code>pre</code> is prefixed.
     *
     * @param pre the prefix of each line
     * @return a string representation of this matrix
     */
    public static String format(double[][] m, String pre) {
        StringBuilder output = new StringBuilder();
        output.append(pre).append("[\n").append(pre);
        for (int i = 0; i < m.length; i++) {
            double[] row = m[i];
            output.append(" [");
            formatTo(output, row, ", ");
            output.append("]\n").append(pre);
        }
        output.append("]\n");
        return output.toString();
    }

    /**
     * returns String-representation of Matrix.
     *
     * @param nf NumberFormat to specify output precision
     * @return String representation of this Matrix in precision as specified by
     *         given NumberFormat
     */
    public static String format(double[][] m, NumberFormat nf) {
        return formatTo(new StringBuilder().append("[\n"), m, " [", "]\n", ", ", nf).append("]").toString();
    }

    /**
     * Formats the String collection with the specified separator.
     *
     * @param d the String collection to format
     * @param sep separator between the single values of the array, e.g. ' '
     * @return a String representing the String Collection d
     */
    public static String format(Collection<String> d, String sep) {
        if (d == null) {
            return "null";
        }
        if (d.isEmpty()) {
            return "";
        }
        if (d.size() == 1) {
            return d.iterator().next();
        }
        StringBuilder buffer = new StringBuilder();
        Iterator<String> it = d.iterator();
        buffer.append(it.next());
        while (it.hasNext()) {
            buffer.append(sep);
            buffer.append(it.next());
        }
        return buffer.toString();
    }

    /**
     * Formats the string array d with the specified separator.
     *
     * @param d the string array to be formatted
     * @param sep separator between the single values of the array, e.g. ','
     * @return a String representing the string array d
     */
    public static String format(String[] d, String sep) {
        StringBuilder buffer = new StringBuilder();
        for (int i = 0; i < d.length; i++) {
            if (i > 0) {
                buffer.append(sep).append(d[i]);
            } else {
                buffer.append(d[i]);
            }
        }
        return buffer.toString();
    }

    /**
     * Formats the double array d with the default number format.
     *
     * @param buf String builder to append to
     * @param d the double array to be formatted
     * @param sep separator between the single values of the array, e.g. ','
     * @return Output buffer buf
     */
    public static StringBuilder formatTo(StringBuilder buf, double[] d, String sep) {
        if (d == null) {
            return buf.append("null");
        }
        if (d.length == 0) {
            return buf;
        }
        buf.append(d[0]);
        for (int i = 1; i < d.length; i++) {
            buf.append(sep);
            buf.append(d[i]);
        }
        return buf;
    }

    /**
     * Formats the double array d with the specified number format.
     *
     * @param buf String builder to append to
     * @param d the double array to be formatted
     * @param sep separator between the single values of the array, e.g. ','
     * @param nf the number format to be used for formatting
     * @return Output buffer buf
     */
    public static StringBuilder formatTo(StringBuilder buf, double[] d, String sep, NumberFormat nf) {
        if (d == null) {
            return buf.append("null");
        }
        if (d.length == 0) {
            return buf;
        }
        buf.append(nf.format(d[0]));
        for (int i = 1; i < d.length; i++) {
            buf.append(sep);
            buf.append(nf.format(d[i]));
        }
        return buf;
    }

    /**
     * Formats the float array d with the default number format.
     *
     * @param buf String builder to append to
     * @param d the float array to be formatted
     * @param sep separator between the single values of the array, e.g. ','
     * @return Output buffer buf
     */
    public static StringBuilder formatTo(StringBuilder buf, float[] d, String sep) {
        if (d == null) {
            return buf.append("null");
        }
        if (d.length == 0) {
            return buf;
        }
        buf.append(d[0]);
        for (int i = 1; i < d.length; i++) {
            buf.append(sep);
            buf.append(d[i]);
        }
        return buf;
    }

    /**
     * Formats the float array d with the specified number format.
     *
     * @param buf String builder to append to
     * @param d the float array to be formatted
     * @param sep separator between the single values of the array, e.g. ','
     * @param nf the number format to be used for formatting
     * @return Output buffer buf
     */
    public static StringBuilder formatTo(StringBuilder buf, float[] d, String sep, NumberFormat nf) {
        if (d == null) {
            return buf.append("null");
        }
        if (d.length == 0) {
            return buf;
        }
        buf.append(nf.format(d[0]));
        for (int i = 1; i < d.length; i++) {
            buf.append(sep);
            buf.append(nf.format(d[i]));
        }
        return buf;
    }

    /**
     * Formats the int array d.
     *
     * @param buf String builder to append to
     * @param d the int array to be formatted
     * @param sep separator between the single values of the array, e.g. ','
     * @return Output buffer buf
     */
    public static StringBuilder formatTo(StringBuilder buf, int[] d, String sep) {
        if (d == null) {
            return buf.append("null");
        }
        if (d.length == 0) {
            return buf;
        }
        buf.append(d[0]);
        for (int i = 1; i < d.length; i++) {
            buf.append(sep);
            buf.append(d[i]);
        }
        return buf;
    }

    /**
     * Formats the long array d.
     *
     * @param buf String builder to append to
     * @param d the long array to be formatted
     * @param sep separator between the single values of the long array, e.g. ','
     * @return Output buffer buf
     */
    public static StringBuilder formatTo(StringBuilder buf, long[] d, String sep) {
        if (d == null) {
            return buf.append("null");
        }
        if (d.length == 0) {
            return buf;
        }
        buf.append(d[0]);
        for (int i = 1; i < d.length; i++) {
            buf.append(sep);
            buf.append(d[i]);
        }
        return buf;
    }

    /**
     * Formats the short array d.
     *
     * @param buf String builder to append to
     * @param d the int array to be formatted
     * @param sep separator between the single values of the array, e.g. ','
     * @return Output buffer buf
     */
    public static StringBuilder formatTo(StringBuilder buf, short[] d, String sep) {
        if (d == null) {
            return buf.append("null");
        }
        if (d.length == 0) {
            return buf;
        }
        buf.append(d[0]);
        for (int i = 1; i < d.length; i++) {
            buf.append(sep);
            buf.append(d[i]);
        }
        return buf;
    }

    /**
     * Formats the byte array d.
     *
     * @param buf String builder to append to
     * @param d the byte array to be formatted
     * @param sep separator between the single values of the array, e.g. ','
     * @return Output buffer buf
     */
    public static StringBuilder formatTo(StringBuilder buf, byte[] d, String sep) {
        if (d == null) {
            return buf.append("null");
        }
        if (d.length == 0) {
            return buf;
        }
        buf.append(d[0]);
        for (int i = 1; i < d.length; i++) {
            buf.append(sep);
            buf.append(d[i]);
        }
        return buf;
    }

    /**
     * Formats the boolean array d.
     *
     * @param buf String builder to append to
     * @param d the boolean array to be formatted
     * @param sep separator between the single values of the array, e.g. ','
     * @return Output buffer buf
     */
    public static StringBuilder formatTo(StringBuilder buf, boolean[] d, String sep) {
        if (d == null) {
            return buf.append("null");
        }
        if (d.length == 0) {
            return buf;
        }
        buf.append(d[0]);
        for (int i = 1; i < d.length; i++) {
            buf.append(sep);
            buf.append(format(d[i]));
        }
        return buf;
    }

    /**
     * Format a boolean value as string "true" or "false".
     *
     * @param buf Buffer to append to
     * @param b Boolean to Format
     * @return Same buffer
     */
    public static StringBuilder formatTo(StringBuilder buf, boolean b) {
        return buf.append(b ? "true" : "false");
    }

    /**
     * Formats the array of double arrays d with the specified separators and
     * fraction digits.
     *
     * @param buf Output buffer
     * @param d the double array to be formatted
     * @param pre Row prefix (e.g. " [")
     * @param pos Row postfix (e.g. "]\n")
     * @param csep Separator for columns (e.g. ", ")
     * @param nf the number format to use
     * @return Output buffer buf
     */
    public static StringBuilder formatTo(StringBuilder buf, double[][] d, String pre, String pos, String csep,
            NumberFormat nf) {
        if (d == null) {
            return buf.append("null");
        }
        if (d.length == 0) {
            return buf;
        }
        for (int i = 0; i < d.length; i++) {
            buf.append(pre);
            formatTo(buf, d[i], csep, nf);
            buf.append(pos);
        }
        return buf;
    }

    /**
     * Returns a string with the specified number of whitespace.
     *
     * @param n the number of whitespace characters
     * @return a string with the specified number of blanks
     */
    public static String whitespace(int n) {
        if (n < WHITESPACE_BUFFER_LENGTH) {
            return WHITESPACE_BUFFER.substring(0, n);
        }
        char[] buf = new char[n];
        for (int i = 0; i < n; i++) {
            buf[i] = WHITESPACE_BUFFER.charAt(0);
        }
        return new String(buf);
    }

    /**
     * Returns a string with the specified number of whitespace.
     *
     * @param n the number of whitespace characters
     * @return a string with the specified number of blanks
     */
    public static StringBuilder whitespace(StringBuilder buf, int n) {
        while (n >= WHITESPACE_BUFFER_LENGTH) {
            buf.append(WHITESPACE_BUFFER);
            n -= WHITESPACE_BUFFER_LENGTH;
        }
        return n > 0 ? buf.append(WHITESPACE_BUFFER, 0, n) : buf;
    }
}

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