Proof-of-Concept for a Guice-based Parser

Guice-based Parser

import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;

import com.google.inject.AbstractModule;
import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Module;
import com.google.inject.name.Names;

public class Parser {
	public static Annotations parse(String annotationAsString) throws IOException{
		Annotations annotations = new Annotations();
		BufferedReader reader = new BufferedReader(new StringReader(annotationAsString));
		
		String s;
		Annotation annotation = null;
		Custom custom = null;
		Injector injector;
		ColorConverter colorConverter = new ColorConverter();
		List<Module> modules = new ArrayList<Module>();
		while((s = reader.readLine()) != null){
			if(s.startsWith("[") && (annotation != null || custom != null)){
				modules.add(colorConverter);
				injector = Guice.createInjector(modules.toArray(new Module[modules.size()]));
				if(annotation != null){
					injector.injectMembers(annotation);	
				}else{
					injector.injectMembers(custom);
				}
				
				modules.clear();
				annotation = null;
				injector = null;
			}
			if(s.startsWith("[TEXT]")){
				annotation = new TextAnnotation();
				annotations.annotations.add(annotation);
			}else if(s.startsWith("[CUSTOM]")){
				custom = new Custom();
				annotations.custom = custom;
			}else{ //parse Line
				int index = s.indexOf("=");
				if(index < 1){
					continue;
				}
				final String key = s.substring(0, index).trim();
				final String value = s.substring(index+1).trim();
				
				modules.add(new AbstractModule() {
					@Override
					protected void configure() {
						bindConstant().annotatedWith(Names.named(key.toUpperCase())).to(value);
					}
				});				
			}
		}
		
		if(annotation != null || custom != null){
			modules.add(colorConverter);
			injector = Guice.createInjector(modules.toArray(new Module[modules.size()]));
			if(annotation != null){
				injector.injectMembers(annotation);	
			}else{
				injector.injectMembers(custom);
			}
			
			modules.clear();
			annotation = null;
			injector = null;
		}
		
		return annotations;
	}

	public static void main(String[] args) throws IOException {
		StringBuilder builder = new StringBuilder();
		builder.append("[TEXT]\r\n");
		builder.append("CUSTOMPROPERTY = 1\r\n");
		builder.append("X = 177\r\n");
		builder.append("Y = 149\r\n");
		builder.append("WIDTH = 145\r\n");
		builder.append("HEIGHT = 151\r\n");
		builder.append("PAGE = 1\r\n");
		builder.append("EDIT = 1\r\n");
		builder.append("TEXT = Checker\r\n");
		builder.append("FONTHEIGHT = 44790\r\n");
		builder.append("COLOR = 0, 0, 0\r\n");
		builder.append("FILLCOLOR = 0, 255, 0\r\n");
		builder.append("TRANSPARENT = 0\r\n");
		builder.append("[TEXT]\r\n");
		builder.append("CUSTOMPROPERTY = 2\r\n");
		builder.append("X = 35\r\n");
		builder.append("Y = 354\r\n");
		builder.append("WIDTH = 315\r\n");
		builder.append("HEIGHT = 151\r\n");
		builder.append("PAGE = 1\r\n");
		builder.append("EDIT = 1\r\n");
		builder.append("TEXT = Mehrzeilige Notiz&lt;N&gt;und das nach dem Umbruch&lt;N&gt;Oder doch nicht?\r\n");
		builder.append("FONTHEIGHT = 44790\r\n");
		builder.append("COLOR = 128, 128, 128\r\n");
		builder.append("FILLCOLOR = 255, 255, 0\r\n");
		builder.append("TRANSPARENT = 0\r\n");
		builder.append("[CUSTOM]\r\n");
		builder.append("FRAMES = |1|2|3|\r\n");

		Annotations annotations = parse(builder.toString());
		System.out.println(annotations.toString());
	}
}