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This module contains the Metro runtime code.

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/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package com.sun.xml.rpc.streaming;

import java.util.HashMap;
import java.util.Map;

/**
 *  A prefix factory that caches the prefixes it creates. 
 *
 * @author JAX-RPC Development Team
 */
public class PrefixFactoryImpl implements PrefixFactory {

    public PrefixFactoryImpl(String base) {
        _base = base;
        _next = 1;
    }

    public String getPrefix(String uri) {
        String prefix = null;

        if (_cachedUriToPrefixMap == null) {
            _cachedUriToPrefixMap = new HashMap();
        } else {
            prefix = (String) _cachedUriToPrefixMap.get(uri);
        }

        if (prefix == null) {
            prefix = _base + Integer.toString(_next++);
            _cachedUriToPrefixMap.put(uri, prefix);
        }

        return prefix;
    }

    private String _base;
    private int _next;
    private Map _cachedUriToPrefixMap;
}