Optimized list of dependency files - using cache

src/com/elphel/vdt/core/tools/params/Tool.java

@@ -128,6 +128,7 @@ public class Tool extends Context implements Cloneable, Inheritable {
     // TODO: Compare dependFiles with literary result of other tools, if match - these are states, not files
     private List<Parameter> dependStates; // snapshot names
     private List<Parameter> dependFiles;
+    private List<String> dependFilesCache = null; // list of resolved file relative paths calculated earlier 
     
     private Map <String,String> dependStatesTimestamps;
     private Map <String,String> dependFilesTimestamps;
@@ -251,6 +252,7 @@ public class Tool extends Context implements Cloneable, Inheritable {
         result=null;
         dependStates=null;
         dependFiles=null;
+        dependFilesCache=null;
 		DEBUG_PRINT("Created tool"+name+" disabledString = "+disabledString);
         pinned=false;
         openState=null;
@@ -669,27 +671,31 @@ public class Tool extends Context implements Cloneable, Inheritable {
     			}
     		}
     	}
+    	dependFilesCache = null; //invalidate, will be recreated
     }
-    public List<String> getDependFiles(){
-    	DEBUG_PRINT("------ getDependFiles()");
+    public List<String> getDependFiles(boolean rebuild){
+    	if (rebuild || (dependFilesCache == null)) {
+	    	DEBUG_PRINT("------ getDependFiles(rebuild="+rebuild+"), rebuilding");
 	    	setTreeReparse(true); // Set actual dependence    	
 	    	if ((dependFiles == null) || (dependFiles.size()==0)) return null;
-    	List<String> list = new ArrayList<String>();
+	    	dependFilesCache = new ArrayList<String>();
 	    	for (Iterator<Parameter> iter= dependFiles.iterator(); iter.hasNext();) {
 	    		List<String> vList=iter.next().getValue(new FormatProcessor(this)); // null for topFormatProcessor
 	    		if (vList!=null) {
 	    			for (String item:vList){
 	    				if ((item!=null) && (item.trim().length()>0)){
-    					list.add(item.trim());
+	    					dependFilesCache.add(item.trim());
 	    				}
 	    			}
-//    			list.addAll(vList);
 	    		}
 	    	}
-    	for (String item:list){
+    	} else {
+	    	DEBUG_PRINT("------ getDependFiles(rebuild="+rebuild+"), using cache");
+    	}
+    	for (String item:dependFilesCache){
     		DEBUG_PRINT("-----> "+getName()+".getDependFiles()->"+item);
     	}
-    	return list;
+    	return dependFilesCache;
     }
 
     public List<String> getDependStates(){

src/com/elphel/vdt/core/tools/params/ToolSequence.java

@@ -1721,7 +1721,8 @@ java.lang.NullPointerException
     private  Map <String,String> makeDependFiles(Tool tool, boolean failOnMissing){
     	DEBUG_PRINT("++++++ makeDependFiles("+tool.getName()+")");
     	Map <String,String> depFiles=new Hashtable<String,String>();
-    	List<String> dependFileNames=tool.getDependFiles(); // files on which this tool depends - make cached version
+    	// Use depend files cache if available
+    	List<String> dependFileNames=tool.getDependFiles(false); // files on which this tool depends - make cached version
     	if (dependFileNames!=null) {
     		IProject project = SelectedResourceManager.getDefault().getSelectedProject(); // should not be null when we got here
     		for (String depFile: dependFileNames){