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POJava string templatizer / formatter with named arguments
 

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  1. POJava string templatizer / formatter with named arguments
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    <p>Is there a standard or at least widespread implementation of something like <code>String.format</code>, but with named arguments?</p> <p>I'd like to format a templatized string in a way like that:</p> <pre><code>Map&lt;String, Object&gt; args = new HashMap&lt;String, Object&gt;(); args.put("PATH", "/usr/bin"); args.put("file", "foo"); String s = someHypotheticalMethod("#{PATH}/ls #{file}"); // "/usr/bin/ls foo" </code></pre> <p>Technically, it's almost the same as:</p> <pre><code>String[] args = new String[] { "/usr/bin", "foo" }; String s = String.format("%1$s/ls %2$s", args); // "/usr/bin/ls foo" </code></pre> <p>but with named arguments.</p> <p>I'm aware of:</p> <ul> <li><a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/lang/String.html">String.format</a></li> <li><a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Formatter.html">Formatter</a></li> <li><a href="http://docs.oracle.com/javase/1.4.2/docs/api/java/text/MessageFormat.html">MessageFormat</a></li> </ul> <p>but all of them use ordered or at least numbered arguments, not named ones. I know it's trivial to implement one, but is there a mechanism I'm looking for in standard Java libraries or at least in Apache Commons / Guava / something similar, without bringing in high-profile template engines?</p> <p><strong>NOTE</strong>: I'm not really interested in full-blown template engines, with features like some imperative / functional logic, flow control, modifiers, sub-templates / inclusions, iterators, etc. Generally the following method is a working 4-line implementation - that's all I need:</p> <pre><code>public static String interpolate(String format, Map&lt;String, ? extends Object&gt; args) { String out = format; for (String arg : args.keySet()) { out = Pattern.compile(Pattern.quote("#{" + arg + "}")). matcher(out). replaceAll(args.get(arg).toString()); } return out; } </code></pre>
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    1. COAny reason you aren't just using "#" + args.get("PATH") + "/ls #" + args.get("file") ?
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      1. USCharles
    2. COI have a bunch of template files, I have a map of arguments and I need to get filled-in strings from every of these template files.
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