composite_fileaccess.py

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from .composite_filedirentry import FileDirEntry, FileDirEntryList, FileEntry, DirEntry
from datetime import datetime
 
 
class Composite_FileAccess:
    
 
    # ! [Python Composite_FileAccess directory tree]
    _rootEntry =  \
            DirEntry("root", datetime.now(), [ \
                FileEntry("FileA.txt", 101, datetime.now()),
                FileEntry("FileB.txt", 102, datetime.now()),
                FileEntry("FileC.txt", 103, datetime.now()),
                DirEntry("subdir1", datetime.now(), [ \
                    FileEntry("FileD.txt", 104, datetime.now()),
                    FileEntry("FileE.txt", 105, datetime.now()),
                    DirEntry("subdir2", datetime.now(), [ \
                        FileEntry("FileF.txt", 106, datetime.now()),
                        FileEntry("FileG.txt", 107, datetime.now())
                    ]),
                ]),
            ])
    # ! [Python Composite_FileAccess directory tree]
 
 
    
    def _FindEntry(filepath : str) -> FileDirEntry:
        root = Composite_FileAccess._rootEntry # type: FileDirEntry
        found = False
 
        pathComponents = filepath.split('/')
        numComponents = len(pathComponents)
        for index in range(0, numComponents):
            found = False
            if root.Name != pathComponents[index]:
                # Mismatch in path to this entry, bad path
                root = None
                break
 
            if index + 1 >= numComponents:
                # Reached end of path so we found what was asked for.
                found = True
                break
 
            # Still haven't reached end of specified path, look at
            # the current root for children.
 
            children = root.Children
            if not children:
                # Path included leaf in the middle, bad path
                found = False
                break
 
            root = None # assume we won't find anything
            # Look ahead in the path for a matching child.
            childComponent = pathComponents[index + 1] # type: str
            for child in children:
                if childComponent == child.Name:
                    root = child
                    found = True
                    break
            if not found:
                # Couldn't find matching child, bad path
                break
        return root
 
 
    
    def GetEntry(filepath : str) -> FileDirEntry:
        filepath = filepath.replace('\\', '/')
        fileDirEntry = Composite_FileAccess._FindEntry(filepath)
        if not fileDirEntry:
            raise FileNotFoundError(2, "Unable to find entry", filepath)
 
        return fileDirEntry