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Posted to dev@tapestry.apache.org by Apache Wiki <wi...@apache.org> on 2007/06/26 05:29:36 UTC
[Tapestry Wiki] Update of "Tapestry5OutputLocaleNumber" by MarcusVeloso

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The following page has been changed by MarcusVeloso:
http://wiki.apache.org/tapestry/Tapestry5OutputLocaleNumber

The comment on the change is:
Initial changes.

New page:
Creating a new component for formatting (numbers) according to locale, using literals (integer, decimal or currency). It's based on Output component.

=== MyOutput.java ===
{{{
package org.example.hilo.components;

import java.text.DecimalFormat;
import java.text.Format;
import java.text.NumberFormat;
import java.util.Locale;

import org.apache.tapestry.ComponentResources;
import org.apache.tapestry.MarkupWriter;
import org.apache.tapestry.annotations.Inject;
import org.apache.tapestry.annotations.Parameter;
import org.apache.tapestry.annotations.Service;
import org.apache.tapestry.ioc.internal.util.InternalUtils;
import org.apache.tapestry.ioc.services.ThreadLocale;

/** component that formats a value and outputs it. */
public class MyOutput
{
    @Parameter(required = true)
    private Object _value;

    @Parameter(required = true)
    private Object _format;

    @Parameter("componentResources.elementName")
    private String _elementName;

    @Inject
    private ComponentResources _resources;

    @Inject
    @Service("ThreadLocale")
    private ThreadLocale _threadLocale;

    private Locale _localeDefault = _threadLocale.getLocale().getDefault();
	
    boolean beginRender(MarkupWriter writer)
    {
    	String formatted = null;
    	
        if (_format instanceof String)
        {
        	if (_format.toString().equalsIgnoreCase("integer"))

        		formatted = integer().format(_value);

        	else if (_format.toString().equalsIgnoreCase("decimal"))

        		formatted = decimal().format(_value);

        	else if (_format.toString().equalsIgnoreCase("currency"))

        		formatted = currency().format(_value);
        	
        	else
        		
        		formatted = "unknown literal format";
        }
   
        else {
        
        	formatted = ((Format)_format).format(_value);
        }

        if (InternalUtils.isNonBlank(formatted))
        {
            if (_elementName != null)
            {
                writer.element(_elementName);

                _resources.renderInformalParameters(writer);
            }

            writer.write(formatted);

            if (_elementName != null) writer.end();
        }

        return false;
    }

    public NumberFormat integer()
    { 
        NumberFormat fmt = NumberFormat.getInstance(_localeDefault);
        fmt.setMaximumFractionDigits(0);
        return fmt;
    }
    
    public DecimalFormat decimal()
    { 
    	return (DecimalFormat)NumberFormat.getInstance(_localeDefault);
    }
    
    public DecimalFormat currency()
    {
        DecimalFormat fmt = (DecimalFormat)
        	NumberFormat.getCurrencyInstance(_localeDefault);
        fmt.setDecimalSeparatorAlwaysShown(true);
        fmt.setMaximumFractionDigits(2);
        fmt.setMinimumFractionDigits(2);
        return fmt;
    }
}
}}}

[[BR]]
Done. Now we need some page for test, something like:

=== TestOutputLocaleNumber.java ===
{{{
package org.example.hilo.pages;

public class TestOutputLocaleNumber
{
	private float _valor=12345.6789f;

	public float getValor() {
		return _valor;
	}

}
}}}

=== TestOutputLocaleNumber.html ===
{{{
<html xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd">
	<head>
		<title>Output Locale Number</title>
	</head>

	<body>
	<center>

	<h1>Output Locale Number</h1>

	<form t:type="Form">

		<p>Number is 12345.6789</p>

		<p>using expansion results<br/>
			${valor}</p>

		<p>using format="literal:integer" results<br/>
			<span t:type="MyOutput" value="valor" format="literal:integer"/></p>

		<p>using format="literal:decimal" results<br/>
			<span t:type="MyOutput" value="valor" format="literal:decimal"/></p>

		<p>using format="literal:currency" results<br/>
			<span t:type="MyOutput" value="valor" format="literal:currency"/></p>

		<p>using format="someFormat" acts exactly like in Output component</p>

	</form>
	
	</center>
	</body>
</html>
}}}

[[BR]]
As you can see here, we can extend components and learn a little more about Tapestry 5. Thank you Howard!
[[BR]]

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