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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 org.apache.xml.security.stax.ext.DocumentContext;
import org.apache.xml.security.stax.ext.XMLSecurityConstants;

import java.util.*;

/**
 * A concrete DocumentContext Implementation
 *
 */
public class DocumentContextImpl implements DocumentContext, Cloneable {

    private String encoding;
    private String baseURI;
    private final Map contentTypeMap = new TreeMap();
    private final Map processorToIndexMap = new HashMap<>();

    @Override
    public String getEncoding() {
        return encoding;
    }

    public void setEncoding(String encoding) {
        this.encoding = encoding;
    }

    @Override
    public String getBaseURI() {
        return baseURI;
    }

    public void setBaseURI(String baseURI) {
        this.baseURI = baseURI;
    }

    @Override
    public synchronized void setIsInEncryptedContent(int index, Object key) {
        contentTypeMap.put(index, XMLSecurityConstants.ContentType.ENCRYPTION);
        processorToIndexMap.put(key, index);
    }

    @Override
    public synchronized void unsetIsInEncryptedContent(Object key) {
        Integer index = processorToIndexMap.remove(key);
        contentTypeMap.remove(index);
    }

    @Override
    public boolean isInEncryptedContent() {
        return contentTypeMap.containsValue(XMLSecurityConstants.ContentType.ENCRYPTION);
    }

    @Override
    public synchronized void setIsInSignedContent(int index, Object key) {
        contentTypeMap.put(index, XMLSecurityConstants.ContentType.SIGNATURE);
        processorToIndexMap.put(key, index);
    }

    @Override
    public synchronized void unsetIsInSignedContent(Object key) {
        Integer index = processorToIndexMap.remove(key);
        contentTypeMap.remove(index);
    }

    @Override
    public boolean isInSignedContent() {
        return contentTypeMap.containsValue(XMLSecurityConstants.ContentType.SIGNATURE);
    }

    @Override
    public List getProtectionOrder() {
        return new ArrayList(contentTypeMap.values());
    }

    @Override
    public Map getContentTypeMap() {
        return Collections.unmodifiableMap(contentTypeMap);
    }

    protected void setContentTypeMap(Map contentTypeMap) {
        this.contentTypeMap.putAll(contentTypeMap);
    }

    @Override
    protected DocumentContextImpl clone() throws CloneNotSupportedException {
        DocumentContextImpl documentContext = new DocumentContextImpl();
        documentContext.setEncoding(this.encoding);
        documentContext.setBaseURI(this.baseURI);
        documentContext.setContentTypeMap(getContentTypeMap());
        return documentContext;
    }
}