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Apache XML Security for Java supports XML-Signature Syntax and Processing, W3C Recommendation 12 February 2002, and XML Encryption Syntax and Processing, W3C Recommendation 10 December 2002. As of version 1.4, the library supports the standard Java API JSR-105: XML Digital Signature APIs.

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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.xml.security.stax.impl;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.xml.security.exceptions.XMLSecurityException;
import org.apache.xml.security.stax.securityEvent.SecurityEvent;
import org.apache.xml.security.stax.securityEvent.SecurityEventListener;

/**
 */
public class AbstractSecurityContextImpl {
    @SuppressWarnings("unchecked")
    private final Map content = Collections.synchronizedMap(new HashMap());
    private final List securityEventListeners = new ArrayList<>(2);

    public void addSecurityEventListener(SecurityEventListener securityEventListener) {
        if (securityEventListener != null) {
            this.securityEventListeners.add(securityEventListener);
        }
    }

    public synchronized void registerSecurityEvent(SecurityEvent securityEvent) throws XMLSecurityException {
        forwardSecurityEvent(securityEvent);
    }

    protected void forwardSecurityEvent(SecurityEvent securityEvent) throws XMLSecurityException {
        for (SecurityEventListener securityEventListener : securityEventListeners) {
            securityEventListener.registerSecurityEvent(securityEvent);
        }
    }

    @SuppressWarnings("unchecked")
    public  void put(String key, T value) {
        content.put(key, value);
    }

    @SuppressWarnings("unchecked")
    public  T get(String key) {
        return (T) content.get(key);
    }

    @SuppressWarnings("unchecked")
    public  T remove(String key) {
        return (T) content.remove(key);
    }

    @SuppressWarnings("unchecked")
    public  void putList(Object key, T value) {
        if (value == null) {
            return;
        }
        List entry = (List) content.get(key);
        if (entry == null) {
            entry = new ArrayList<>();
            content.put(key, entry);
        }
        entry.addAll(value);
    }

    @SuppressWarnings("unchecked")
    public  void putAsList(Object key, T value) {
        List entry = (List) content.get(key);
        if (entry == null) {
            entry = new ArrayList<>();
            content.put(key, entry);
        }
        entry.add(value);
    }

    @SuppressWarnings("unchecked")
    public  List getAsList(Object key) {
        return (List) content.get(key);
    }

    @SuppressWarnings("unchecked")
    public  void putAsMap(Object key, T mapKey, U mapValue) {
        Map entry = (Map) content.get(key);
        if (entry == null) {
            entry = new HashMap<>();
            content.put(key, entry);
        }
        entry.put(mapKey, mapValue);
    }

    @SuppressWarnings("unchecked")
    public  Map getAsMap(Object key) {
        return (Map) content.get(key);
    }
}