PdfPermissions.java

/*
 * Copyright (C) 2012  Armin Häberling
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 */

package com.aha.pdftools.model;

import com.itextpdf.text.pdf.PdfWriter;

public class PdfPermissions extends AbstractModelObject {

    private static final int NO_PERMISSIONS = 0xFFFFF0C0;

    private boolean mAssembly = true;
    private boolean mCopy = true;
    private boolean mDegradedPrinting = true;
    private boolean mPrinting = true;
    private boolean mScreenReaders = true;
    private boolean mFillIn = true;
    private boolean mModifyContents = true;
    private boolean mModifyAnnotations = true;

    public PdfPermissions() {
    }

    public PdfPermissions(int flags) {
        mAssembly = isFlagSet(flags, PdfWriter.ALLOW_ASSEMBLY);
        mCopy = isFlagSet(flags, PdfWriter.ALLOW_COPY);
        mDegradedPrinting = isFlagSet(flags, PdfWriter.ALLOW_DEGRADED_PRINTING);
        mPrinting = isFlagSet(flags, PdfWriter.ALLOW_PRINTING);
        mScreenReaders = isFlagSet(flags, PdfWriter.ALLOW_SCREENREADERS);
        mFillIn = isFlagSet(flags, PdfWriter.ALLOW_FILL_IN);
        mModifyContents = isFlagSet(flags, PdfWriter.ALLOW_MODIFY_CONTENTS);
        mModifyAnnotations = isFlagSet(flags, PdfWriter.ALLOW_MODIFY_ANNOTATIONS);
    }

    private static boolean isFlagSet(int value, int flag) {
        return (value & flag) == flag;
    }

    public boolean isAssembly() {
        return mAssembly;
    }

    public void setAssembly(boolean allowAssembly) {
        boolean oldValue = mAssembly;
        mAssembly = allowAssembly;
        firePropertyChange("assembly", oldValue, mAssembly);
    }

    public boolean isCopy() {
        return mCopy;
    }

    public void setCopy(boolean allowCopy) {
        boolean oldValue = mCopy;
        mCopy = allowCopy;
        firePropertyChange("copy", oldValue, mCopy);
    }

    public boolean isDegradedPrinting() {
        return mDegradedPrinting;
    }

    public void setDegradedPrinting(boolean allowDegradedPrinting) {
        boolean oldValue = mDegradedPrinting;
        mDegradedPrinting = allowDegradedPrinting;
        firePropertyChange("degradedPrinting", oldValue, mDegradedPrinting);
    }

    public boolean isPrinting() {
        return mPrinting;
    }

    public void setPrinting(boolean allowPrinting) {
        boolean oldValue = mPrinting;
        mPrinting = allowPrinting;
        firePropertyChange("printing", oldValue, mPrinting);
    }

    public boolean isScreenReaders() {
        return mScreenReaders;
    }

    public void setScreenReaders(boolean allowScreenReaders) {
        boolean oldValue = mScreenReaders;
        mScreenReaders = allowScreenReaders;
        firePropertyChange("screenReaders", oldValue, mScreenReaders);
    }

    public boolean isFillIn() {
        return mFillIn;
    }

    public void setFillIn(boolean allowFillIn) {
        boolean oldValue = mFillIn;
        mFillIn = allowFillIn;
        firePropertyChange("fillIn", oldValue, mFillIn);
    }

    public boolean isModifyContents() {
        return mModifyContents;
    }

    public void setModifyContents(boolean allowModifyContents) {
        boolean oldValue = mModifyContents;
        mModifyContents = allowModifyContents;
        firePropertyChange("modifyContents", oldValue, mModifyContents);
    }

    public boolean isModifyAnnotations() {
        return mModifyAnnotations;
    }

    public void setModifyAnnotations(boolean allowModifyAnnotations) {
        boolean oldValue = mModifyAnnotations;
        mModifyAnnotations = allowModifyAnnotations;
        firePropertyChange("modifyAnnotations", oldValue, mModifyAnnotations);
    }

    public int getPermissionFlags() {
        // as per User access permissions table in the pdf specification
        int perms = NO_PERMISSIONS;
        if (mAssembly) {
            perms = perms | PdfWriter.ALLOW_ASSEMBLY;
        }
        if (mCopy) {
            perms = perms | PdfWriter.ALLOW_COPY;
        }
        if (mDegradedPrinting) {
            perms = perms | PdfWriter.ALLOW_DEGRADED_PRINTING;
        }
        if (mPrinting) {
            perms = perms | PdfWriter.ALLOW_PRINTING;
        }
        if (mScreenReaders) {
            perms = perms | PdfWriter.ALLOW_SCREENREADERS;
        }
        if (mFillIn) {
            perms = perms | PdfWriter.ALLOW_FILL_IN;
        }
        if (mModifyContents) {
            perms = perms | PdfWriter.ALLOW_MODIFY_CONTENTS;
        }
        if (mModifyAnnotations) {
            perms = perms | PdfWriter.ALLOW_MODIFY_ANNOTATIONS;
        }
        return perms;
    }

    public String getPermissionsAsString() {
        String permissions = "";
        if (mPrinting) {
            permissions += "AllowPrinting";
        }
        if (mAssembly) {
            permissions += "AllowAssembly";
        }
        if (mCopy) {
            permissions += "AllowCopy";
        }
        if (mDegradedPrinting) {
            permissions += "AllowDegradedPrinting";
        }
        if (mScreenReaders) {
            permissions += "AllowScreenReaders";
        }
        if (mFillIn) {
            permissions += "AllowFillIn";
        }
        if (mModifyContents) {
            permissions += "AllowModifyContents";
        }
        if (mModifyAnnotations) {
            permissions += "AllowModifyAnnotations";
        }
        return permissions;
    }

}