GeomConverter/src/org/lcsim/geometry/util

diff -N DetectorLocator.java
--- /dev/null	1 Jan 1970 00:00:00 -0000
+++ DetectorLocator.java	25 Jan 2010 22:27:43 -0000	1.1
@@ -0,0 +1,120 @@

+/*
+ * DetectorLocator.java
+ *
+ * Created on July 17, 2005, 6:53 PM
+ *
+ */
+
+package org.lcsim.geometry.util;
+
+import org.lcsim.conditions.*;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.InputStream;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.List;
+import org.lcsim.geometry.Detector;
+import org.lcsim.geometry.GeometryReader;
+import org.lcsim.util.cache.FileCache;
+
+/**
+ *
+ * @author jeremym
+ *
+ */
+abstract public class DetectorLocator
+{    
+    static final public String MASTER_TAGLIST_URL = "http://lcsim.org/detectors/taglist.txt";    
+    
+    public static Detector getCurrentDetector()
+    {
+        return findDetector(ConditionsManager.defaultInstance().getDetector());
+    }
+    
+    /**
+     * 
+     * Static utility function to lookup a Detector by name and run number.
+     *  
+     * @param detName name of detector to lookup
+     * @param runNum run number
+     * @param mgr ConditionsManager, which is allowed to be null
+     * SIDE EFFECT: Sets the state of the default ConditionsManager if mgr param is null. 
+     */
+    public static Detector findDetector(String detName, int runNum, ConditionsManager mgr)
+    {
+        Detector detector = null;
+        try {
+
+            /* Set reference to default condMgr if null. */
+            if ( mgr == null ) mgr = ConditionsManager.defaultInstance();
+            
+            /* Set the detector in the conditions manager. */
+            mgr.setDetector(detName,0);
+        
+            /* Get detector object by using GeometryReader. */
+            RawConditions conditions = mgr.getRawConditions("compact.xml");
+            InputStream in = conditions.getInputStream();
+            GeometryReader reader = new GeometryReader();
+            detector = (Detector) reader.read(in);
+        }
+        catch (Exception e)
+        {
+            throw new RuntimeException("Problem while locating detector " + detName, e);
+        }
+            
+        return detector;
+    }
+
+    /* Version of above with default run number and conditions manager. */
+    public static Detector findDetector(String detName)
+    {
+        return findDetector(detName, 0, ConditionsManager.defaultInstance() );
+    }
+    
+    public static List<String> getDetectorNameList()
+    {
+        File file;
+        FileCache cache;
+        BufferedReader reader;
+        ArrayList<String> detList = new ArrayList<String>();
+        try {
+            cache = new FileCache ();
+            file = cache.getCachedFile (new URL (MASTER_TAGLIST_URL) );
+            reader = new BufferedReader (new FileReader (file));
+            
+            for (;;)
+            {
+                String line = reader.readLine();
+                if (line == null) break;
+                detList.add (line.trim ());
+            }
+        
+            reader.close ();
+        }
+        catch (Exception e)
+        {
+            throw new RuntimeException("Error fetching master detector list.", e);
+        }                
+        
+        return detList;
+    }
+  
+    /** 
+     * SIDEEFFECT: ConditionsManager will have conditions for last detector found.
+     */
+    private static void cacheDetectors(List<String> names)
+    {
+        for ( String n : names )
+        {
+            Detector det = findDetector(n);            
+        }
+    }
+    
+    public static void cacheDetectors()
+    {
+        cacheDetectors( getDetectorNameList() );
+    }
+}