Strings.java Source code

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Here is the source code for Strings.java

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/*
 * LingPipe v. 3.9
 * Copyright (C) 2003-2010 Alias-i
 *
 * This program is licensed under the Alias-i Royalty Free License
 * Version 1 WITHOUT ANY WARRANTY, without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the Alias-i
 * Royalty Free License Version 1 for more details.
 *
 * You should have received a copy of the Alias-i Royalty Free License
 * Version 1 along with this program; if not, visit
 * http://alias-i.com/lingpipe/licenses/lingpipe-license-1.txt or contact
 * Alias-i, Inc. at 181 North 11th Street, Suite 401, Brooklyn, NY 11211,
 * +1 (718) 290-9170.
 */

//package com.aliasi.util;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

import java.text.DecimalFormat;

/**
 * Static utility methods for processing strings, characters and
 * string buffers.
 *
 * @author  Bob Carpenter
 * @version 4.0.1
 * @since   LingPipe1.0
 * @see     java.lang.Character
 * @see     java.lang.String
 * @see     java.lang.StringBuilder
 */
public class Strings {

    /**
     * Returns a hash code for a character sequence that is equivalent
     * to the hash code generated for a its string yield.  Recall that
     * the interface {@link CharSequence} does not refine the definition
     * of equality beyond that of {@link Object#equals(Object)}.
     *
     * <P>The return result is the same as would be produced by:
     *
     * <pre>
     *    hashCode(cSeq) = cSeq.toString().hashCode()</pre>
     *
     * Recall that the {@link CharSequence} interface requires its
     * {@link CharSequence#toString()} to return a string
     * corresponding to its characters as returned by
     * <code>charAt(0),...,charAt(length()-1)</code>.  This value
     * can be defined directly by inspecting the hash code for strings:
     *
     * <pre>
     *      int h = 0;
     *      for (int i = 0; i < cSeq.length(); ++i)
     *          h = 31*h + cSeq.charAt(i);
     *      return h;</pre>
     *
     * @param cSeq The character sequence.
     * @return The hash code for the specified character sequence.
     */
    public static int hashCode(CharSequence cSeq) {
        if (cSeq instanceof String)
            return cSeq.hashCode();
        int h = 0;
        for (int i = 0; i < cSeq.length(); ++i)
            h = 31 * h + cSeq.charAt(i);
        return h;
    }
}