/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the  "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id$
 */
package org.apache.qetest.xsl;

import java.io.File;
import java.io.FilenameFilter;
import java.util.Hashtable;
import java.util.StringTokenizer;

/**
 * Bugzilla-specific file filter: .java or .xsl files.
 * Has crude support for an excludes list of filename bases.
 * @see #accept(File, String)
 * @author shane_curcuru@lotus.com
 * @version $Id$
 */
public class BugzillaFileRules implements FilenameFilter
{

    /** Initialize for defaults (not using exclusion list) no-op. */
    public BugzillaFileRules(){}

    /**
     * Initialize with a case-sensitive Hash of file names to exclude.  
     *
     * @param excludesHash - keys are basenames of files to exclude
     */
    public BugzillaFileRules(Hashtable excludesHash)
    {
        setExcludes(excludesHash);
    }

    /**
     * Initialize with a case-insensitive semicolon-delimited String of file names to exclude.  
     *
     * @param excludesStr is specific file names to exclude
     */
    public BugzillaFileRules(String excludesStr)
    {
        setExcludes(excludesStr);
    }

    /**
     * Hash of file name portions to exclude.
     * <p>Keys are base file names, values in hash are ignored. Note that
     * file names may be case-sensitive.</p>
     * <p>Note that we will exclude any filename in our excludes.</p>
     */
    protected Hashtable excludeFiles = null;

    /**
     * Accessor methods to set a case-sensitive Hash of file names to exclude.  
     *
     * @param exFiles hash keys are filenames to exclude
     */
    public void setExcludes(Hashtable exFiles)
    {

        if (exFiles != null)
            excludeFiles = (Hashtable) exFiles.clone();
        else
            excludeFiles = null;
    }

    /**
     * Accessor methods to set a case-sensitive Hash of file names to exclude.  
     *
     * @return clone of our excludes hash
     */
    public Hashtable getExcludes()
    {

        if (excludeFiles != null)
        {
            Hashtable tempHash = (Hashtable) excludeFiles.clone();

            return tempHash;
        }
        else
        {
            return null;
        }
    }

    /**
     * Accessor method to set a list of case-insensitive String
     * directory name(s) to exclude.
     * Names should be separated by {@link #SEPARATOR semicolon}.
     *
     * @param exFiles are specific file names to exclude
     */
    public void setExcludes(String exFiles)
    {
        setExcludes(exFiles, false);
    }

    /** Semicolon separator for {@link #setExcludes(java.lang.String)}. */
    public static final String SEPARATOR = ";";

    /**
     * Accessor method to set an optionally case-sensitive String file name(s) to exclude.
     * <p><b>Note:</b> simply uses .toUpperCase() and .toLowerCase() on the input string(s);
     * does not do full case-checking on the entire string!</p>
     *
     * @param exFiles is specific file names to exclude
     * @param caseSensitive is we should attempt to be
     */
    public void setExcludes(String exFiles, boolean caseSensitive)
    {

        StringTokenizer st = new StringTokenizer(exFiles, SEPARATOR);

        excludeFiles = null;
        excludeFiles = new Hashtable();

        for (int i = 0; st.hasMoreTokens(); i++)
        {
            String fName = st.nextToken();

            excludeFiles.put(fName, "");

            if (!caseSensitive)
            {
                excludeFiles.put(fName.toUpperCase(), "");
                excludeFiles.put(fName.toLowerCase(), "");
            }
        }
    }

    /**
     * Tests if a specified file should be included in a file list.
     * <p>Returns true for: filenames that begin with the directory 
     * name, and: are *.java, or are *.xsl.  If one of each exists, 
     * then we only return true for the *.java file (and not for the 
     * *.xsl file).</p>
     * <p>The essence here is that we return only one file for each 
     * conceptual 'test' that the user wrote.  If they only wrote a 
     * .xsl stylesheet, we return that.  If they only wrote a .java 
     * file (presumably a Testlet), we return that.  If they wrote 
     * both, only return the .java file, since it should have all the 
     * logic necessary to run the test, including hardcoded .xsl 
     * file name.  In this case, it might not be a valid test to 
     * simply transform the .xsl file because the Testlet may 
     * expect that parameters are set, etc.</p>
     * <p><b>Except:</b> if any filenames contain an item 
     * in excludeFiles.</p>
     * @param dir the directory in which the file was found.
     * @param name the name of the file.
     * @return <code>true</code> if the name should be included in the file list; <code>false</code> otherwise.
     * @since JDK1.0
     */
    public boolean accept(File dir, String name)
    {

        // Shortcuts for bogus filenames and dirs
        if (name == null || dir == null)
            return false;

        // Exclude any files that match an exclude rule
        if ((excludeFiles != null) && (excludeFiles.containsKey(name)))
            return false;

        File file = new File(dir, name);
        // Skip any dirs
        if (file.isDirectory())
            return false;
    
        // Only accept files that start with 'bugzilla'
        // HACK: we should really look at the last part of the 
        //  directory name here, but in this one case it's much 
        //  easier to just hard-code the name (this is in 
        //  response to specifying inputDir=tests/bugzilla 
        //  on a Windows platform)
        if (!(name.toLowerCase().startsWith("bugzilla")))
            return false;
            
        // Accept any .java files
        if (name.toLowerCase().endsWith("java"))
            return true;
            
        // If it's a .xsl file..
        if (name.toLowerCase().endsWith("xsl"))
        {
            // Construct matching foo.java from foo.xsl (xsl len = 3)
            File matchingJava = new File(dir, 
                    name.substring(0, (name.length() - 3)) + "java");
            // ..Only accept if matchingJava does not exist        
            return !matchingJava.exists();
        }
            
        // Fall-through: doesn't match, return false
        return false;
    }
}