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/*

   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
   this work for additional information regarding copyright ownership.
   The ASF licenses this file to You 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 org.apache.batik.script;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URL;

import java.util.Collections;
import java.util.Enumeration;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

/**
 * This class represents a list of Java classes/packages to import
 * into a scripting environment.
 *
 * It can initializes it's self by reading a file,
 * from the classpath (META_INF/imports/script.xt).
 *
 * The format of the file is as follows:
 *
 * Anything after a '#' on a line is ignored.
 *
 * The first space delimited token on a line must be either 'class' or
 * 'package'.
 *
 * The remainder of a line is whitespace delimited, fully qualified,
 * Java class/package name (i.e.  java.lang.System).
 *
 * @author