narya/src/java/com/threerings/util/Name.java

//
// $Id: Name.java,v 1.1 2004/03/06 14:55:03 mdb Exp $

package com.threerings.util;

import java.util.regex.Pattern;

import com.threerings.io.SimpleStreamableObject;

/**
 * Contains the name of an entity. Provides a means by which names can be
 * efficiently loosely compared rather than relying on humans to type
 * things exactly or the challenge of inserting code to normalize names
 * everywhere they are compared.
 */
public class Name extends SimpleStreamableObject
    implements Comparable
{
    /** A blank name for use in situations where it is needed.
     * <em>Note:</em> because names are used in distributed applications
     * you cannot assume that a reference check against blank is
     * sufficient. You must use <code>BLANK.equals(targetName)</code>. */
    public static final Name BLANK = new Name("");

    /** Creates a blank instance for unserialization. */
    public Name ()
    {
    }

    /**
     * Creates a name instance with the supplied name.
     */
    public Name (String name)
    {
        _name = (name == null) ? "" : name;
    }

    /**
     * Returns the normalized version of this name.
     */
    public String getNormal ()
    {
        if (_normal == null) {
            _normal = normalize(_name);
        }
        return _normal;
    }

    /**
     * Returns true if this name is valid. Derived classes can provide
     * more interesting requirements for name validity than the default
     * which is that it is non-blank.
     */
    public boolean isValid ()
    {
        return !blank();
    }

    /**
     * Returns true if this name is blank, false if it contains data.
     */
    public boolean blank ()
    {
        return blank(this);
    }

    /**
     * Returns the unprocessed name as a string.
     */
    public String toString ()
    {
        return _name;
    }

    // documentation inherited
    public int hashCode ()
    {
        return getNormal().hashCode();
    }

    // documentation inherited
    public boolean equals (Object other)
    {
        // we have to be of the same derived class but we don't want to
        // wig out if the classes were loaded from different class loaders
        if (other == null ||
            !other.getClass().getName().equals(getClass().getName())) {
            return false;
        } else {
            return getNormal().equals(((Name)other).getNormal());
        }
    }

    // documentation inherited
    public int compareTo (Object o)
    {
        if (o instanceof Name) {
            return getNormal().compareTo(((Name)o).getNormal());
        } else {
            return getClass().getName().compareTo(o.getClass().getName());
        }
    }

    /**
     * Returns true if this name is null or blank, false if it contains
     * useful data. This works on derived classes as well.
     */
    public static boolean blank (Name name)
    {
        return (name == null || name.toString().equals(BLANK.toString()));
    }

    /**
     * Returns a normalized version of the supplied name. The default
     * implementation is case and space insensitive.
     */
    protected String normalize (String name)
    {
        name = name.toLowerCase();
        name = _compactor.matcher(name).replaceAll("");
        return name;
    }

    /** The raw name text. */
    protected String _name;

    /** The normalized name text. */
    protected transient String _normal;

    /** Used to strip spaces from names. */
    protected static Pattern _compactor = Pattern.compile("\\s");
}