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package com.taobao.diamond.utils;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URL;
import java.util.Properties;


/**
 * 
 * @author boyan
 */
public class ResourceUtils {

   
    public static URL getResourceURL(String resource) throws IOException {
        ClassLoader loader = ResourceUtils.class.getClassLoader();
        return getResourceURL(loader, resource);
    }


    
    public static URL getResourceURL(ClassLoader loader, String resource) throws IOException {
        URL url = null;
        if (loader != null)
            url = loader.getResource(resource);
        if (url == null)
            url = ClassLoader.getSystemResource(resource);
        if (url == null)
            throw new IOException("Could not find resource " + resource);
        return url;
    }


    
    public static InputStream getResourceAsStream(String resource) throws IOException {
        ClassLoader loader = ResourceUtils.class.getClassLoader();
        return getResourceAsStream(loader, resource);
    }


   
    public static InputStream getResourceAsStream(ClassLoader loader, String resource) throws IOException {
        InputStream in = null;
        if (loader != null)
            in = loader.getResourceAsStream(resource);
        if (in == null)
            in = ClassLoader.getSystemResourceAsStream(resource);
        if (in == null)
            throw new IOException("Could not find resource " + resource);
        return in;
    }


    
    public static Properties getResourceAsProperties(String resource) throws IOException {
        ClassLoader loader = ResourceUtils.class.getClassLoader();
        return getResourceAsProperties(loader, resource);
    }


    
    public static Properties getResourceAsProperties(ClassLoader loader, String resource) throws IOException {
        Properties props = new Properties();
        InputStream in = null;
        String propfile = resource;
        in = getResourceAsStream(loader, propfile);
        props.load(in);
        in.close();
        return props;
    }


    
    public static InputStreamReader getResourceAsReader(String resource) throws IOException {
        return new InputStreamReader(getResourceAsStream(resource));
    }


   
    public static Reader getResourceAsReader(ClassLoader loader, String resource) throws IOException {
        return new InputStreamReader(getResourceAsStream(loader, resource));
    }


    
    public static File getResourceAsFile(String resource) throws IOException {
        return new File(getResourceURL(resource).getFile());
    }


    
    public static File getResourceAsFile(ClassLoader loader, String resource) throws IOException {
        return new File(getResourceURL(loader, resource).getFile());
    }

}