org.das2.util.FileUtil

static utility methods. introduced Jul 28, 2008.

consumeStream

consumeStream( java.io.InputStream in ) → int

read all the bytes off the stream, perhaps to empty a URL response. This does not close the stream!

Parameters

in - the input stream, which will not be closed by this method.

Returns:

the total number of bytes read.

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deleteFileTree

deleteFileTree( java.io.File root ) → boolean

deletes all files and folders below root, and root, just as "rm -r" would. TODO: check links

Parameters

root - the root where we start deleting.

Returns:

true if the operation was successful.

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deleteFileTree( java.io.File root, java.util.Set exclude ) → boolean

deleteWithinFileTree

deleteWithinFileTree( java.io.File root, String name ) → boolean

deletes all files with the given name, and root, just as "find . -name name -exec rm {} \;" would. TODO: check links. For example deleteWithinFileTree( root, ".listing" )

Parameters

root - the root directory of the tree.
name - the file name.

Returns:

true if the operation was successful.

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fileCompare

fileCompare( java.io.File file1, java.io.File file2 ) → boolean

returns True if the file contents are equal.

Parameters

file1 - a File
file2 - a File

Returns:

true if the two files have identical

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fileCopy

fileCopy( java.io.File src, java.io.File dst ) → void

copies the file or folder from src to dst.

Parameters

src - the source file or folder.
dst - the location for the new file or folder.

Returns:

void (returns nothing)

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find

find( java.io.File root, String name ) → File

find a files with the given name within the given root, just as "find . -name name -print \;" would. TODO: check links. For example, find( "/usr/share/fonts/truetype", "FreeMono.ttf" )

Parameters

root - the root to start
name - name to look for.

Returns:

the File found, or null if it does not exist.

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find( java.io.File root, java.util.regex.Pattern pattern, java.util.List result ) → int
find( java.io.File[][] roots, String name ) → File

getMagic

getMagic( java.io.File src ) → String

return the first four bytes of the file as a string. Some magic numbers we care about:

  • '\x89HDF' HDF (and new NetCDF) files

    Parameters

    src - a File

    Returns:

    a four byte string

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    isParent

    isParent( java.io.File possibleParent, java.io.File maybeChild ) → boolean

    return true of the maybeChild parent is a child of possibleParent. Note either can be null, and this will not throw an exception, but will return false.

    Parameters

    possibleParent - parent file.
    maybeChild - a file or folder which may exist within possibleParent.

    Returns:

    true if the possibleParent is actually a parent of maybeChild.

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    lineCount

    lineCount( java.io.File f ) → int

    return the number of lines in the text file. Breaking the file into lines is handled by Java's BufferedReader.

    Parameters

    f - the file

    Returns:

    the number of lines.

    See Also:

    BufferedReader


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    listRecursively

    listRecursively( java.io.File root, java.util.regex.Pattern name, java.util.List matches ) → List

    find all files under the root matching the spec.

    Parameters

    root - the root of the search (e.g. /fonts/)
    name - the pattern to match
    matches - list that will accept the matches, or null if one should be created.

    Returns:

    the list.

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    listRecursively( java.io.File root, String glob ) → File[]

    readFileToString

    readFileToString( java.io.File f ) → String

    read all the bytes in the UTF-8 encoded file into a string.

    Parameters

    f - the file, which presumed to be UTF-8 (or ASCII) encoded.

    Returns:

    string containing the contents of the file.

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    readInputStreamToString

    readInputStreamToString( java.io.InputStream ins ) → String

    read all the bytes in the UTF-8 encoded inputStream into a string.

    Parameters

    ins - the input stream

    Returns:

    string containing the contents of the file.

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    writeStringToFile

    writeStringToFile( java.io.File f, String src ) → void

    write all the bytes in the string to a file using UTF-8 encoding.

    Parameters

    f - the file name.
    src - the string to write to the file.

    Returns:

    void (returns nothing)

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