ray.j.greenwell
059d557ec9
If Java were invented today, you can be damn sure the array classes would have reasonable hashCode(), equals(), and toString() implementations, instead of falling back to Object's. git-svn-id: https://samskivert.googlecode.com/svn/trunk@2969 6335cc39-0255-0410-8fd6-9bcaacd3b74c
96 lines
2.9 KiB
Java
96 lines
2.9 KiB
Java
//
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// $Id$
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//
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// samskivert library - useful routines for java programs
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// Copyright (C) 2001-2010 Michael Bayne, et al.
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//
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// This library is free software; you can redistribute it and/or modify it
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// under the terms of the GNU Lesser General Public License as published
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// by the Free Software Foundation; either version 2.1 of the License, or
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// (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package com.samskivert.util;
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/**
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* Formats a message and an array of alternating key value pairs like so:
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*
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* <pre>message [key=value, key=value, key=value]</pre>
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*/
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public class LogBuilder
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{
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/**
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* Creates a log builder with no message and no initial key value pairs.
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*/
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public LogBuilder ()
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{
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this("");
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}
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/**
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* Creates a log builder with the given message and key value pairs.
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*/
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public LogBuilder (Object message, Object... args)
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{
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_log = new StringBuilder().append(message);
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append(args);
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}
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/**
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* Adds the given key value pairs to the log.
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*/
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public LogBuilder append (Object... args)
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{
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if (args != null && args.length > 1) {
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for (int ii = 0, nn = args.length - (args.length % 2); ii < nn; ii += 2) {
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if (_hasArgs) {
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_log.append(", ");
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} else {
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if (_log.length() > 0) {
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// only need a space if we have a message
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_log.append(' ');
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}
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_log.append('[');
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_hasArgs = true;
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}
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_log.append(args[ii]).append('=');
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try {
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Object arg = args[ii + 1];
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_log.append(((arg == null) || !arg.getClass().isArray())
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? arg : ArrayUtil.toString(arg));
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} catch (Throwable t) {
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_log.append("<toString() failure: ").append(t).append('>');
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}
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}
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}
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return this;
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}
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/**
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* Returns the formatted log message. Does not reset the buffer. You can continue to append
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* arguments and call {@link #toString} again.
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*/
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@Override public String toString ()
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{
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if (_hasArgs) {
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try {
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return _log.append(']').toString();
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} finally {
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_log.setLength(_log.length() - 1);
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}
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}
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return _log.toString();
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}
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protected boolean _hasArgs;
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protected StringBuilder _log;
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}
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