modifiedselector.java

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            } else if ("digest".equals(algoName.getValue())) {
                algorithm = new DigestAlgorithm();
            } else if ("checksum".equals(algoName.getValue())) {
                algorithm = new ChecksumAlgorithm();
            }
        } else {
            if (algorithmClass != null) {
                // use Algorithm specified by classname
                algorithm = (Algorithm) loadClass(
                    algorithmClass,
                    "is not an Algorithm.",
                    Algorithm.class);
            } else {
                // nothing specified - use default
                algorithm = defaultAlgorithm;
            }
        }

        // specify the cache classname
        if (cacheName != null) {
            // use Cache defined via name
            if ("propertyfile".equals(cacheName.getValue())) {
                cache = new PropertiesfileCache();
            }
        } else {
            if (cacheClass != null) {
                // use Cache specified by classname
                cache = (Cache) loadClass(cacheClass, "is not a Cache.", Cache.class);
            } else {
                // nothing specified - use default
                cache = defaultCache;
            }
        }

        // specify the comparator classname
        if (compName != null) {
            // use Algorithm defined via name
            if ("equal".equals(compName.getValue())) {
                comparator = new EqualComparator();
             } else if ("rule".equals(compName.getValue())) {
                // TODO there is a problem with the constructor for the RBC.
                // you have to provide the rules in the constructors - no setters
                // available.
                throw new BuildException("RuleBasedCollator not yet supported.");
                // Have to think about lazy initialization here...  JHM
                // comparator = new java.text.RuleBasedCollator();
            }
        } else {
            if (comparatorClass != null) {
                // use Algorithm specified by classname
                comparator = (Comparator) loadClass(
                    comparatorClass,
                    "is not a Comparator.",
                    Comparator.class);
            } else {
                // nothing specified - use default
                comparator = defaultComparator;
            }
        }

        //
        // -----  Set the special attributes, pattern '*.*'  -----
        //
        for (Iterator itSpecial = specialParameter.iterator(); itSpecial.hasNext();) {
            Parameter par = (Parameter) itSpecial.next();
            useParameter(par);
        }
        specialParameter = new Vector();
    }


    /**
     * Loads the specified class and initializes an object of that class.
     * Throws a BuildException using the given message if an error occurs during
     * loading/instantiation or if the object is not from the given type.
     * @param classname the classname
     * @param msg the message-part for the BuildException
     * @param type the type to check against
     * @return a castable object
     */
    protected Object loadClass(String classname, String msg, Class type) {
        try {
            // load the specified class
            ClassLoader cl = getClassLoader();
            Class clazz = null;
            if (cl != null) {
                clazz = cl.loadClass(classname);
            } else {
                clazz = Class.forName(classname);
            }

            Object rv = clazz.newInstance();

            if (!type.isInstance(rv)) {
                throw new BuildException("Specified class (" + classname + ") " + msg);
            }
            return rv;
        } catch (ClassNotFoundException e) {
            throw new BuildException("Specified class (" + classname + ") not found.");
        } catch (Exception e) {
            throw new BuildException(e);
        }
    }


    // -----  the selection work  -----


    /**
     * Implementation of ResourceSelector.isSelected().
     *
     * @param resource The resource to check
     * @return whether the resource is selected
     * @see ResourceSelector#isSelected(Resource)
     */
    public boolean isSelected(Resource resource) {
        if (resource.isFilesystemOnly()) {
            // We have a 'resourced' file, so reconvert it and use
            // the 'old' implementation.
            FileResource fileResource = (FileResource) resource;
            File file = fileResource.getFile();
            String filename = fileResource.getName();
            File basedir = fileResource.getBaseDir();
            return isSelected(basedir, filename, file);
        } else {
            try {
                // How to handle non-file-Resources? I copy temporarily the
                // resource to a file and use the file-implementation.
                FileUtils fu = FileUtils.getFileUtils();
                File tmpFile = fu.createTempFile("modified-", ".tmp", null, true, true);
                Resource tmpResource = new FileResource(tmpFile);
                ResourceUtils.copyResource(resource, tmpResource);
                boolean isSelected = isSelected(tmpFile.getParentFile(),
                                                tmpFile.getName(),
                                                resource.toLongString());
                return isSelected;
            } catch (UnsupportedOperationException uoe) {
                log("The resource '"
                  + resource.getName()
                  + "' does not provide an InputStream, so it is not checked. "
                  + "Akkording to 'selres' attribute value it is "
                  + ((selectResourcesWithoutInputStream) ? "" : " not")
                  + "selected.", Project.MSG_INFO);
                return selectResourcesWithoutInputStream;
            } catch (Exception e) {
                throw new BuildException(e);
            }
        }
    }


    /**
     * Implementation of BaseExtendSelector.isSelected().
     *
     * @param basedir as described in BaseExtendSelector
     * @param filename as described in BaseExtendSelector
     * @param file as described in BaseExtendSelector
     * @return as described in BaseExtendSelector
     */
    public boolean isSelected(File basedir, String filename, File file) {
        return isSelected(basedir, filename, file.getAbsolutePath());
    }


    /**
     * The business logic of this selector for use as ResourceSelector of
     * FileSelector.
     *
     * @param basedir as described in BaseExtendSelector
     * @param filename as described in BaseExtendSelector
     * @param cacheKey the name for the key for storing the hashvalue
     * @return
     */
    private boolean isSelected(File basedir, String filename, String cacheKey) {
        validate();
        File f = new File(basedir, filename);

        // You can not compute a value for a directory
        if (f.isDirectory()) {
            return selectDirectories;
        }

        // Get the values and do the comparison
        String cachedValue = String.valueOf(cache.get(f.getAbsolutePath()));
        String newValue = algorithm.getValue(f);

        boolean rv = (comparator.compare(cachedValue, newValue) != 0);

        // Maybe update the cache
        if (update && rv) {
            cache.put(f.getAbsolutePath(), newValue);
            setModified(getModified() + 1);
            if (!getDelayUpdate()) {
                saveCache();
            }
        }

        return rv;
    }


   /**
    * save the cache file
    */
    protected void saveCache() {
        if (getModified() > 0) {
            cache.save();
            setModified(0);
        }
    }


    // -----  attribute and nested element support  -----


    /**
     * Setter for algorithmClass.
     * @param classname  new value
     */
    public void setAlgorithmClass(String classname) {
        algorithmClass = classname;
    }


    /**
     * Setter for comparatorClass.
     * @param classname  new value
     */
    public void setComparatorClass(String classname) {
        comparatorClass = classname;
    }


    /**
     * Setter for cacheClass.
     * @param classname  new value
     */
    public void setCacheClass(String classname) {
        cacheClass = classname;
    }


    /**
     * Support for <i>update</i> attribute.
     * @param update new value
     */
    public void setUpdate(boolean update) {
        this.update = update;
    }


    /**
     * Support for <i>seldirs</i> attribute.
     * @param seldirs new value
     */
    public void setSeldirs(boolean seldirs) {
        selectDirectories = seldirs;
    }


    /**
     * Support for <i>selres</i> attribute.
     * @param newValue the new value
     */
    public void setSelres(boolean newValue) {
        this.selectResourcesWithoutInputStream = newValue;
    }


    /**
     * Getter for the modified count
     * @return modified count
     */
    public int getModified() {
        return modified;
    }


    /**
     * Setter for the modified count
     * @param modified count
     */
    public void setModified(int modified) {
        this.modified = modified;
    }


    /**
     * Getter for the delay update
     * @return true if we should delay for performance
     */
    public boolean getDelayUpdate() {
        return delayUpdate;
    }


    /**
     * Setter for the delay update
     * @param delayUpdate true if we should delay for performance
     */
    public void setDelayUpdate(boolean delayUpdate) {
        this.delayUpdate = delayUpdate;
    }


    /**
     * Add the classpath.
     * @param path the classpath
     */
    public void addClasspath(Path path) {
        if (classpath != null) {
            throw new BuildException("<classpath> can be set only once.");
        }
        classpath = path;
    }


    /**
     * Returns and initializes the classloader for this class.
     * @return the classloader
     */