/*
 * Copyright (c) 2012 EMC Corporation
 * All Rights Reserved
 */
package com.emc.storageos.db.common;

import java.lang.annotation.*;
import java.util.*;

import com.sun.jersey.core.spi.scanning.PackageNamesScanner;
import com.sun.jersey.spi.scanning.AnnotationScannerListener;

/**
 * Scanner for sweeping all DataObject types defined and creates:
 * - CF Map for building db schema
 * - DependencyTracker - with all the dependency information between the types
 */
public abstract class PackageScanner {
    protected DbSchemaScannerInterceptor _scannerInterceptor = null;
    private PackageNamesScanner _scanner;
    private String[] packages;
    
    public PackageScanner(String... packages) {
    	this.packages = packages;
        _scanner = new PackageNamesScanner(packages);
    }

    /**
     * Package where model classes are defined
     * 
     * @param packages
     */
    public void setPackages(String... packages) {
    	this.packages = packages;
        _scanner = new PackageNamesScanner(packages);
    }

    /**
     * set schema scanner interceptor - use only for unit testing schema changes
     * 
     * @param scannerInterceptor
     */
    public void setScannerInterceptor(DbSchemaScannerInterceptor scannerInterceptor) {
        _scannerInterceptor = scannerInterceptor;
    }

    /**
     * Scan model classes and load up CF information from them
     */
    @SuppressWarnings("unchecked")
    public void scan(Class<? extends Annotation>... annotations) {
        AnnotationScannerListener scannerListener = new AnnotationScannerListener(annotations);
        _scanner.scan(scannerListener);

        Iterator<Class<?>> it = scannerListener.getAnnotatedClasses().iterator();
        while (it.hasNext()) {
            processClass(it.next());
        }
    }
    
    @SuppressWarnings("unchecked")
	protected Collection<Class<?>> getModelClasses(Class<? extends Annotation>... annotations) {
    	PackageNamesScanner clazzScanner = new PackageNamesScanner(this.packages);
        AnnotationScannerListener scannerListener = new AnnotationScannerListener(annotations);
        clazzScanner.scan(scannerListener);

        return scannerListener.getAnnotatedClasses();
    }

    /**
     * Processes class
     * 
     * @param clazz
     */
    abstract protected void processClass(Class clazz);
}