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/*
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* Angkor Web Framework
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*
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* Distributable under LGPL license.
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* See terms of license at gnu.org.
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*/
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package com.tirsen.angkor.widget;
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import com.tirsen.angkor.RenderContext;
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import com.tirsen.angkor.Component;
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import java.io.IOException;
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import java.text.Format;
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import java.text.MessageFormat;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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/**
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* Displays text to the user.
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*
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* Has the following functionality:
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* <li> fetches data from a list of {@link ValueModel}s.
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* <li> the data is formated according to a {@link Format}.
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* <li> if the format is not a {@link MessageFormat} only the data from the first model is used.
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* <li> if the format is {@link MessageFormat} all values are fetched from all models.
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* <li> if setting the as text it is specified according to the syntax of {@link MessageFormat}.
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* <li> renders the format in a SPAN-tag with the correct id so it can easily be accessed while testing.
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*
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* <br>
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*
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* Future functionality:
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* <li> support for fonts.
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* <li> support for rendering of png-images with the text according to a specified font
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* on the server (as a truetype-file or an os-font).
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* <li> support for cascading style sheets.
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*
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* <!-- $Id: TextLabel.java,v 1.6 2002/10/13 19:59:23 tirsen Exp $ -->
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*
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* @author $Author: tirsen $
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* @version $Revision: 1.6 $
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*/
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public class TextLabel extends Component
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{
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private static final MessageFormat CONSTANT_FORMAT = new MessageFormat("{0}");
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private List models;
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private Format format = CONSTANT_FORMAT;
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public TextLabel()
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{
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}
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public TextLabel(String label)
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{
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setLabel(label);
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}
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public TextLabel(ValueModel model)
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{
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setModel(model);
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}
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public TextLabel(String label, ValueModel model)
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{
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setLabel(label);
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setModel(model);
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}
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public void setLabel(String label)
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{
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format = new MessageFormat(label);
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}
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/**
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* Sets a single model to fetch data from.
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*/
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public void setModel(ValueModel model)
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{
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this.models = new ArrayList(1);
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addModel(model);
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}
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/**
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* Adds a model.
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* If the format is not a {@link MessageFormat} only the first model is used.
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*/
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public void addModel(ValueModel model)
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{
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if (models == null) models = new ArrayList(1);
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models.add(model);
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}
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/**
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* Gets the text formatted correctly and with the values fetched from the models.
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*/
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public String getFormattedText()
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{
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String display;
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if (models != null && !models.isEmpty())
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{
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if (format instanceof MessageFormat)
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{
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Object[] values;
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values = new Object[models.size()];
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Iterator it = models.iterator();
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for (int i = 0; it.hasNext(); i++)
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{
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ValueModel model = (ValueModel) it.next();
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values[i] = model.getValue();
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}
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display = format.format(values);
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}
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else
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{
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// this is not exactly 100% good design, might need some refactoring
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// if we don't have a message-format format the string with only the first models value
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Object value = ((ValueModel) models.get(0)).getValue();
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display = format.format(value);
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}
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}
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else
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{
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display = format.format(null);
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}
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return display;
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}
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/**
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* Sets a custom format. For example a currency format or a date format.
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*/
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public void setFormat(Format format)
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{
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this.format = format;
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}
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public Format getFormat()
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{
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return format;
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}
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public String toString()
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{
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return getClass().getName() + "[" + format.toString() + "]";
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}
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public void render(RenderContext context) throws IOException
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{
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if (isVisible())
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{
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context.startTag("SPAN id = \"" + uniqueId(context) + "\"");
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context.println(getFormattedText());
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context.endTag("SPAN");
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}
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}
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}
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