+++ /dev/null
-package tim.prune.load;
-
-import java.io.BufferedReader;
-import java.io.File;
-import java.io.FileReader;
-import java.io.IOException;
-import java.util.ArrayList;
-
-/**
- * Class to load the contents of a file
- * into an array for later retrieval
- */
-public class FileCacher
-{
- /** File to cache */
- private File _file = null;
- /** Array to hold lines of file */
- private String[] _contentArray = null;
-
-
- /**
- * Constructor
- * @param inFile File object to cache
- */
- public FileCacher(File inFile)
- {
- _file = inFile;
- loadFile();
- }
-
-
- /**
- * Load the specified file into memory
- */
- private void loadFile()
- {
- ArrayList<String> contentList = new ArrayList<String>();
- if (_file != null && _file.exists() && _file.canRead())
- {
- BufferedReader reader = null;
- try
- {
- reader = new BufferedReader(new FileReader(_file));
- String currLine = reader.readLine();
- if (currLine != null && currLine.startsWith("<?xml")) {
- return; // it's an xml file, it shouldn't use this cacher
- }
- while (currLine != null)
- {
- if (currLine.indexOf('\0') >= 0)
- {
- reader.close();
- return; // it's a binary file, shouldn't use this cacher
- }
- if (currLine.trim().length() > 0)
- contentList.add(currLine);
- currLine = reader.readLine();
- }
- }
- catch (IOException ioe) {}
- finally
- {
- // close file ignoring errors
- try
- {
- if (reader != null) reader.close();
- }
- catch (Exception e) {}
- }
- }
- // Convert into String array for keeps
- int numLines = contentList.size();
- _contentArray = new String[numLines];
- for (int i=0; i<numLines; i++)
- _contentArray[i] = contentList.get(i);
- }
-
-
- /**
- * @return Contents of the file as array of non-blank Strings
- */
- public String[] getContents()
- {
- return _contentArray;
- }
-
-
- /**
- * Get the top section of the file for preview
- * @param inNumRows number of lines to extract
- * @param inMaxWidth max length of Strings (longer ones will be chopped)
- * @return String array containing non-blank lines from the file
- */
- public String[] getSnippet(int inNumRows, int inMaxWidth)
- {
- final int MIN_SNIPPET_SIZE = 3;
- // Check size is within sensible limits
- int numToCopy = inNumRows;
- if (numToCopy > getNumLines()) numToCopy = getNumLines();
- int size = numToCopy;
- if (size < MIN_SNIPPET_SIZE) size = MIN_SNIPPET_SIZE;
- String[] result = new String[size];
- // Copy Strings across
- System.arraycopy(_contentArray, 0, result, 0, numToCopy);
- // Chop Strings to max width if necessary
- if (inMaxWidth > 10)
- {
- for (int i=0; i<size; i++)
- {
- if (result[i] == null)
- result[i] = "";
- else
- {
- if (result[i].length() > inMaxWidth)
- result[i] = result[i].trim();
- if (result[i].length() > inMaxWidth)
- result[i] = result[i].substring(0, inMaxWidth);
- }
- }
- }
- return result;
- }
-
- /**
- * @return the number of non-blank lines in the file
- */
- public int getNumLines()
- {
- return _contentArray.length;
- }
-
-
- /**
- * Clear the memory
- */
- public void clear()
- {
- _file = null;
- _contentArray = null;
- }
-}