org.coos.messaging.BaseCOContainer Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of messaging-lib
There is a newer version: 1.3.1
/**
 * COOS - Connected Objects Operating System (www.connectedobjects.org).
 *
 * Copyright (C) 2009 Telenor ASA and Tellu AS. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This library is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see .
 *
 * You may also contact one of the following for additional information:
 * Telenor ASA, Snaroyveien 30, N-1331 Fornebu, Norway (www.telenor.no)
 * Tellu AS, Hagalokkveien 13, N-1383 Asker, Norway (www.tellu.no)
 */
package org.coos.messaging;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;

import org.coos.messaging.COContainer;
import org.coos.util.macro.MacroSubstituteReader;

/**
 * Base class with default implementation of the COContainer interface.
 * 
 * @author Robert Bjærum, Tellu AS
 *
 */
public class BaseCOContainer implements COContainer {
	public static final String COOS_CONFIG_PATH = "/org/coos/config";
	public final static String DEFAULT_COOS_CONFIG_DIR = "./coosConfig";
	protected String configDir = DEFAULT_COOS_CONFIG_DIR;

	public String getConfigDir() {
		return configDir;
	}

	public void setConfigDir(String configDir) {
		this.configDir = configDir;
	}

	public Object getObject(String name) {
		return null;
	}

	/**
	 * Return resource as Stream.
	 * 
	 * The resource name will be attempted resolved as follows. A baseName is formed following the same
	 * rule as for Class.getResourceAsStream(), removing any "/" prefix.
	 * 

	 * 1. First, try File("./", baseName)
	 * 

	 * 2. Then, try File(configDir, baseName)
	 * 

	 * 3. Then, try getResourceAsStream(resourceName)
	 * 

	 * 4. Then, try getResourceAsStream(COOS_CONFIG_PATH and try the resulting path name.
	 * 
	 * 5. If failed, throw IOException
	 * 
	 * @param resourceName complete path to resource or base name of resource
	 * @throws IOException if resource get fails
	 * @see Class
	 */
	public InputStream getResource(String resourceName) throws IOException {
		InputStream is = null;
		String baseName;

		if (resourceName.isEmpty()) {
			return null;
		}
		
		if (resourceName.startsWith("/")) {
			baseName = resourceName.substring(1);
		} else {
			baseName = resourceName;
			resourceName = "/" + resourceName;
		}
		
		try {
			File file = new File(".", baseName);
			is = file.toURI().toURL().openStream();
			is = substitute(is);
			if (is != null) {
				return is;
			}
		} catch (Exception ignore) {}
		
		try {
			File file = new File(configDir, baseName);
			is = file.toURI().toURL().openStream();
			is = substitute(is);
			if (is != null) {
				return is;
			}
		} catch (Exception ignore) {}

		try {
			is = this.getClass().getResourceAsStream(resourceName);
			is = substitute(is);
			if (is != null) {
				return is;
			}
		} catch (Exception ignore) {}

		is = this.getClass().getResourceAsStream(COOS_CONFIG_PATH + resourceName);
		is = substitute(is);
		return is;
	}

	@SuppressWarnings("unchecked")
	public Class loadClass(String className) throws ClassNotFoundException {
		return Class.forName(className);
	}

	protected InputStream substitute(InputStream is) throws IOException {
		if (is == null) {
			throw new IOException("Inputstream cannot be null");
		}
		InputStreamReader isr = new InputStreamReader(is);
		MacroSubstituteReader msr = new MacroSubstituteReader(isr);
		String substituted = msr.substituteMacros();
		is = new ByteArrayInputStream(substituted.getBytes());
		return is;
	}

    @Override
    public void start() throws Exception {
        // TODO Auto-generated method stub
        
    }

    @Override
    public void stop() throws Exception {
        // TODO Auto-generated method stub
        
    }

}