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A Hypermedia as the Engine of Application State (HATEOAS) library

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package au.com.mountainpass.hyperstate.server.serialization;

import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.MessageSource;
import org.springframework.context.i18n.LocaleContextHolder;
import org.springframework.stereotype.Component;

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;

@Component
public class MessageSourceAwareSerializer extends JsonSerializer {

  @Autowired
  private MessageSource messageSource;

  public MessageSourceAwareSerializer() {
  }

  public String interpolate(final CharSequence value) {
    final Pattern patt = Pattern.compile("\\{(.*?)\\}");
    final Matcher m = patt.matcher(value);
    final StringBuffer sb = new StringBuffer(value.length());
    while (m.find()) {
      final String code = m.group(1);
      m.appendReplacement(sb, Matcher
          .quoteReplacement(messageSource.getMessage(code, null, LocaleContextHolder.getLocale())));
    }
    m.appendTail(sb);
    return sb.toString();
  }

  @Override
  public void serialize(final String value, final JsonGenerator jgen,
      final SerializerProvider provider) throws IOException, JsonProcessingException {
    if (messageSource == null) {
      jgen.writeString(value);
    } else {
      jgen.writeString(interpolate(value));
    }
  }
}