""" some helpfull methods """
import xml.dom.minidom
import os.path

def getText(nodelist):
    
    rc = ""
    for node in nodelist:
    
    	if node.nodeType == node.TEXT_NODE:
           rc = rc + node.data
    return rc

def changeNodesInIndexMeta(path,node,subnodes,parent=None):
    """node mit subnodes wird in index.meta in path eingetragen bzw. ausgetauscht"""

    if os.path.exists(path+"/index.meta"):
        inFile=file(path+"/index.meta")
        f=inFile.read()
        inFile.close()
    else:
        f="""<start></start>"""
    
    
    dom=xml.dom.minidom.parseString(f)
    root=dom.getElementsByTagName("start")[0]

    if parent:
        
        root=root.getElementsByTagName(parent)[0]

    
    # check if node already exist

    nodeOld=root.getElementsByTagName(node)
    
    if nodeOld: # if yes -> delete it
        root.removeChild(nodeOld[0]).unlink()

    nodeNew=dom.createElement(node) # create new
   
    
    for subnode in subnodes.keys():
        
        namenode=dom.createElement(subnode)
	namenodetext=dom.createTextNode(subnodes[subnode])
	namenode.appendChild(namenodetext)
	nodeNew.appendChild(namenode)

    
    root.appendChild(nodeNew)

    writefile=file(path+"/index.meta","w")
    writefile.write(dom.toxml().encode('utf-8'))
    writefile.close()