org.apache.james.mailet.standard.matchers.FileRegexMatcher Maven / Gradle / Ivy

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package org.apache.james.mailet.standard.matchers;

import java.io.IOException;
import java.util.regex.PatternSyntaxException;

import javax.mail.MessagingException;

/**
 * Initializes RegexMatcher with regular expressions from a file.
 *
 */
public class FileRegexMatcher extends GenericRegexMatcher {
    
    /**
     * @see org.apache.james.mailet.standard.matchers.GenericRegexMatcher#init()
     */
    public void init() throws MessagingException {
        java.io.RandomAccessFile patternSource = null;
        try {
            patternSource = new java.io.RandomAccessFile(getCondition(), "r");
            int lines = 0;
            while(patternSource.readLine() != null) lines++;
            patterns = new Object[lines][2];
            patternSource.seek(0);
            for (int i = 0; i < lines; i++) {
                String line = patternSource.readLine();
                patterns[i][0] = line.substring(0, line.indexOf(':'));
                patterns[i][1] = line.substring(line.indexOf(':')+1);
            }          
            compile(patterns);
                  
        }
        catch (java.io.FileNotFoundException fnfe) {
            throw new MessagingException("Could not locate patterns.", fnfe);
        }
        catch (java.io.IOException ioe) {
            throw new MessagingException("Could not read patterns.", ioe);
        }
        catch(PatternSyntaxException mp) {
            throw new MessagingException("Could not initialize regex patterns", mp);
        } finally {
            if (patternSource != null) {
                // close the file
                try {
                    patternSource.close();
                } catch (IOException e) {
                    // just ignore on close
                }
            }
        }
    }
}