de.intarsys.pdf.crypt.AbstractSecurityHandler Maven / Gradle / Ivy

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/*
 * Copyright (c) 2007, intarsys consulting GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * - Neither the name of intarsys nor the names of its contributors may be used
 *   to endorse or promote products derived from this software without specific
 *   prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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package de.intarsys.pdf.crypt;

import de.intarsys.pdf.cos.COSDictionary;
import de.intarsys.pdf.cos.COSTrailer;
import de.intarsys.pdf.st.STDocument;

/**
 * An abstract superclass for implementing {@link ISecurityHandler}.
 * 
 */
public abstract class AbstractSecurityHandler implements ISecurityHandler {

	private COSDictionary cosEncryption;

	private COSEncryption encryption;

	private STDocument stDoc;

	protected AbstractSecurityHandler() {
		super();
	}

	public void attach(STDocument stDoc) {
		if (stDoc == null) {
			return;
		}
		this.stDoc = stDoc;
		cosEncryption = stDoc.cosGetTrailer().get(COSTrailer.DK_Encrypt)
				.asDictionary();
		encryption = (COSEncryption) COSEncryption.META
				.createFromCos(cosEncryption);
	}

	public COSDictionary cosGetEncryption() {
		return cosEncryption;
	}

	public void detach(STDocument stDoc) throws COSSecurityException {
		this.stDoc = null;
	}

	public COSEncryption getEncryption() {
		return encryption;
	}

	public void initialize(STDocument stDoc) {
		this.stDoc = stDoc;
		cosEncryption = stDoc.cosGetTrailer().get(COSTrailer.DK_Encrypt)
				.asDictionary();
		encryption = (COSEncryption) COSEncryption.META
				.createFromCos(cosEncryption);
	}

	public STDocument stGetDoc() {
		return stDoc;
	}
}