package org.argeo.osgi.a2;
   
   import java.util.Collections;
   import java.util.SortedMap;
   import java.util.TreeMap;
   
   import org.argeo.osgi.boot.OsgiBootUtils;
   import org.osgi.framework.Version;
   
  /**
   * A logical linear sequence of versions of a given {@link A2Component}. This is
   * typically a combination of major and minor version, indicating backward
   * compatibility.
   */
  public class A2Branch implements Comparable<A2Branch> {
  	private final A2Component component;
  	private final String id;
  
  	final SortedMap<Version, A2Module> modules = Collections.synchronizedSortedMap(new TreeMap<>());
  
  	public A2Branch(A2Component component, String id) {
  		this.component = component;
  		this.id = id;
  		component.branches.put(id, this);
  	}
  
  	A2Module getOrAddModule(Version version, Object locator) {
  		if (modules.containsKey(version)) {
  			A2Module res = modules.get(version);
  			if (OsgiBootUtils.isDebug() && !res.getLocator().equals(locator)) {
  				OsgiBootUtils.debug("Inconsistent locator " + locator + " (registered: " + res.getLocator() + ")");
  			}
  			return res;
  		} else
  			return new A2Module(this, version, locator);
  	}
  
  	A2Module last() {
  		return modules.get(modules.lastKey());
  	}
  
  	A2Module first() {
  		return modules.get(modules.firstKey());
  	}
  
  	A2Component getComponent() {
  		return component;
  	}
  
  	String getId() {
  		return id;
  	}
  
  	@Override
  	public int compareTo(A2Branch o) {
  		return id.compareTo(id);
  	}
  
  	@Override
  	public int hashCode() {
  		return id.hashCode();
  	}
  
  	@Override
  	public boolean equals(Object obj) {
  		if (obj instanceof A2Branch) {
  			A2Branch o = (A2Branch) obj;
  			return component.equals(o.component) && id.equals(o.id);
  		} else
  			return false;
  	}
  
  	@Override
  	public String toString() {
  		return getCoordinates();
  	}
  
  	public String getCoordinates() {
  		return component + ":" + id;
  	}
  
  	static String versionToBranchId(Version version) {
  		return version.getMajor() + "." + version.getMinor();
  	}
  }