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Simple java (1.6) crawler to crawl web pages on one and same domain.

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/******************************************************
 * Web crawler
 * 
 *
 * Copyright (C) 2012 by Peter Hedenskog (http://peterhedenskog.com)
 *
 ******************************************************
 *
 * Licensed 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.
 *
 *******************************************************
 */
package com.soulgalore.crawler.guice;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import com.google.inject.AbstractModule;
import com.google.inject.name.Names;

/**
 * Base class for modules, fetches and loads the property file. By default, all
 * properties are read from {@value #PROPERTY_FILE}, and each property can be
 * overridden by adding the same property as a System property.
 * 
 */
public abstract class AbstractPropertiesModule extends AbstractModule {

	/**
	 * The properties file in the class path. You can override these properties
	 * by system properties.
	 */
	protected static final String PROPERTY_FILE = "crawler.properties";

	/**
	 * Properties read from {@link #PROPERTY_FILE}.
	 * 
	 */
	private final Properties properties = new Properties();

	@Override
	protected void configure() {

		
		
		InputStream is = null;
		try {
			is = getClass().getResourceAsStream("/" + PROPERTY_FILE);
			properties.load(is);

			// override by file in the running dir
			File localFile = new File(new File(System.getProperty("com.soulgalore.crawler.propertydir", ".")), PROPERTY_FILE);
		
			if (localFile.exists()) {
				InputStream in = new FileInputStream(localFile);
				properties.load(in);
			}
				
			
			// override the properties by setting a system property
			properties.putAll(System.getProperties());

			Names.bindProperties(binder(), properties);

		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (is != null)
				try {
					is.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
		}

	}

	/**
	 * Get the properties for this module.
	 * 
	 * @return the properties
	 */
	protected Properties getProperties() {
		return properties;
	}

}