TagsCollector.java

package openeye.logic;

import com.google.common.base.Splitter;
import com.google.common.collect.Iterables;
import com.google.common.collect.Sets;
import java.util.Map;
import java.util.Set;
import net.minecraft.launchwrapper.Launch;

public class TagsCollector {

	private static final String ELEMENT_NAME = "openeye.tags";
	private static final Splitter TAG_SPLITTER = Splitter.on(',');

	private Set<String> tags;

	public Set<String> getTags() {
		if (tags == null) {
			tags = Sets.newHashSet();
			addBlackboardTags(tags);
			addEnvTags(tags);
			addArgsTags(tags);
			addConfigTags(tags);
		}
		return tags;
	}

	private static void addConfigTags(Set<String> result) {
		if (Config.tags != null) result.addAll(Config.tags);
	}

	private static void addArgsTags(Set<String> result) {
		@SuppressWarnings("unchecked")
		Map<String, String> args = (Map<String, String>)Launch.blackboard.get("launchArgs");
		String tags = args.get(ELEMENT_NAME);
		if (tags != null) Iterables.addAll(result, TAG_SPLITTER.split(tags));
	}

	private static void addEnvTags(Set<String> result) {
		Map<String, String> env = System.getenv();
		if (env.containsKey(ELEMENT_NAME)) {
			String tags = env.get(ELEMENT_NAME);
			Iterables.addAll(result, TAG_SPLITTER.split(tags));
		}
	}

	@SuppressWarnings("unchecked")
	private static void addBlackboardTags(Set<String> result) {
		Object tags = Launch.blackboard.get(ELEMENT_NAME);
		if (tags instanceof Set) result.addAll((Set<String>)tags);
	}

}