InputTextSetBean.java

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package com.sun.faces.test.servlet30.facelets;

import java.io.Serializable;
import java.util.Arrays;
import java.util.Collection;
import java.util.Set;
import java.util.TreeSet;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;

@ManagedBean(name = "inputTextSetBean")
@SessionScoped
public class InputTextSetBean implements Serializable {

    protected Set<String> tags = new TreeSet<String>(Arrays.asList("seed"));

    public Set<String> getTags() {
        return tags;
    }

    public void setTags(Set<String> tags) {
        this.tags = tags;
    }

    public static class StringToSetConverter implements Converter {

        @Override
        public Object getAsObject(FacesContext ctx, UIComponent component, String value) {
            if (value == null) {
                return null;
            }
            Set<String> tagSet = new TreeSet<String>();
            for (String tag : value.split("\\s+")) {
                if (!tag.isEmpty()) {
                    tagSet.add(tag);
                }
            }
            return tagSet;
        }

        @Override
        public String getAsString(FacesContext ctx, UIComponent component, Object value) {
            if (value == null) {
                return "";
            }
            StringBuilder builder = new StringBuilder();
            @SuppressWarnings("unchecked")
            Collection<String> tags = (Collection<String>) value;
            for (String tag : tags) {
                builder.append(tag);
                builder.append(" ");
            }
            return builder.toString().trim();
        }
    }

    public String printTags() {
        if (tags.isEmpty()) {
            return "No tags";
        }
        StringBuilder builder = new StringBuilder();
        for (String tag : tags) {
            builder.append("'");
            builder.append(tag);
            builder.append("' ");
        }
        return builder.toString().trim();
    }

    public Converter getTagsConverter() {
        return new StringToSetConverter();
    }
}