Use Groovy to find path of a file in a directory tree

FindFile.groovy

import groovy.transform.TypeChecked


/**
 * search file according to its name in directory and subdirectories
 */
@TypeChecked
class FileFind {
	String basePath; // for unit testing		

	/**
	 * 
	 * Find a file within a hierarchy given a path.
	 * 
	 * @param basePath  which folder to start the search
	 * @param targetPath the name or a sub path
	 * @return the path where the file was found
	 */
	public String find(String basePath, String targetPath){
		def result = ''
		String curPath = basePath + File.separator + targetPath
		
		if(new File(curPath).exists()){
			result = curPath;
		}else{
			result = searchUp(basePath, targetPath)			
			if(!result){
				result = searchDown(basePath, targetPath)				
			}			
		}
		
		result
	}
	
	/**
	 * 
	 * @param targetPath the name or a sub path
	 * @return the path where the file was found
	 */
	public String find(String targetPath){
		def result = ''
		String curDir = getCurrentPath()		
		find(curDir, targetPath)		
	}	
	
	/** depth first recursive search of sub directories */
	def searchDown(String startDir, String targetPath){
		def result = "";
		File curDir = new File("$startDir")
		
		try{
			curDir.eachDirRecurse { File cur ->				
				def fp = new File(cur.path + File.separator + targetPath)				
				if(fp.exists()){
					result = fp
					throw BREAK
				}
			}
		}catch(BreakClosureException ex){
			// 
		}

		result		
	}
	
	/** Search for path in parent directories  */
	def searchUp(String startDir, String targetPath){
		def result = "";
		
		File lastDir = new File(startDir)
		def up = File.separator + '..'
		File curDir = new File("$startDir$up")
		
		try{
			while(curDir.getCanonicalPath() != lastDir.getCanonicalPath()){
				def fp = new File(curDir.path + File.separator + targetPath)
	
				if(fp.exists()){
					result = fp
					throw BREAK
				}
				
				lastDir = curDir
				curDir =  new File("${curDir.path}$up")				
			}	
		}catch(BreakClosureException ex){
			//
		}

		result
		
	}
	
	protected String getCurrentPath(){
		//return basePath ? basePath : new File(".").path
		new File(".").path
	}	

	final static BREAK = new BreakClosureException() // for exit out of closures	

	static class BreakClosureException extends Throwable {

		public BreakClosureException() {
			super()
		}

	}

}