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

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,nodeAttributes=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="""<resource type="ECHO" version="1.1"></resource>"""
    
    
    dom=xml.dom.minidom.parseString(f)
    root=dom.getElementsByTagName("resource")[0]
    
    if parent:

        try:
            root=root.getElementsByTagName(parent)[0]
        except:
            #print "parent",parent
            nodeNew=dom.createElement(parent)
            root.appendChild(nodeNew)
            root=root.getElementsByTagName(parent)[0]
    
    # check if node already exist


    if node=="":
        for subnode in subnodes.keys():

            nodeOld=root.getElementsByTagName(subnode)
            
            if nodeOld: # if yes -> delete it
                try:
                    root.removeChild(nodeOld[0]).unlink()
                except:
                    """nothing"""

            namenode=dom.createElement(re.sub(r' ','-',subnode))
            namenodetext=dom.createTextNode(subnodes[subnode].decode("utf8"))
            namenode.appendChild(namenodetext)
            root.appendChild(namenode)

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

        nodeNew=dom.createElement(node) # create new

        if nodeAttributes:
            for attribute in nodeAttributes.keys():
                #print attribute,nodeAttributes[attribute]
                nodeNew.setAttribute(attribute,nodeAttributes[attribute])

        for subnode in subnodes.keys():

            namenode=dom.createElement(re.sub(r' ','-',subnode))
            namenodetext=dom.createTextNode(subnodes[subnode].decode("utf8"))
            namenode.appendChild(namenodetext)
            nodeNew.appendChild(namenode)


        root.appendChild(nodeNew)

    writefile=file(path+"/index.meta","w")
    writefile.write(dom.toxml().encode('utf-8'))
    writefile.close()
    os.chmod(path+"/index.meta",0664)