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Tomcat example source code file (MultiMapNamesEnumeration.java)

This example Tomcat source code file (MultiMapNamesEnumeration.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

enumeration, enumeration, multimap, multimapnamesenumeration, multimapnamesenumeration, object, object, string, string, util

The Tomcat MultiMapNamesEnumeration.java source code

/*
 *  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.tomcat.util.collections;

import java.util.Enumeration;

/** Enumerate the distinct header names.
    Each nextElement() is O(n) ( a comparation is
    done with all previous elements ).

    This is less frequesnt than add() -
    we want to keep add O(1).
*/
public final class MultiMapNamesEnumeration implements Enumeration {
    int pos;
    int size;
    String next;
    MultiMap headers;

    // toString and unique options are not implemented -
    // we allways to toString and unique.
    
    /** Create a new multi-map enumeration.
     * @param  headers the collection to enumerate 
     * @param  toString convert each name to string 
     * @param  unique return only unique names
     */
    MultiMapNamesEnumeration(MultiMap headers, boolean toString,
			     boolean unique) {
	this.headers=headers;
	pos=0;
	size = headers.size();
	findNext();
    }

    private void findNext() {
	next=null;
	for(  ; pos< size; pos++ ) {
	    next=headers.getName( pos ).toString();
	    for( int j=0; j<pos ; j++ ) {
		if( headers.getName( j ).equalsIgnoreCase( next )) {
		    // duplicate.
		    next=null;
		    break;
		}
	    }
	    if( next!=null ) {
		// it's not a duplicate
		break;
	    }
	}
	// next time findNext is called it will try the
	// next element
	pos++;
    }
    
    public boolean hasMoreElements() {
	return next!=null;
    }

    public Object nextElement() {
	String current=next;
	findNext();
	return current;
    }
}

Other Tomcat examples (source code examples)

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