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/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2023 Apryse Group NV
    Authors: Apryse Software.

    This program is offered under a commercial and under the AGPL license.
    For commercial licensing, contact us at https://itextpdf.com/sales.  For AGPL licensing, see below.

    AGPL licensing:
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero 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 Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see .
 */
package com.itextpdf.kernel.pdf.canvas.parser.data;

import com.itextpdf.io.LogMessageConstant;
import com.itextpdf.kernel.pdf.canvas.CanvasGraphicsState;

public class AbstractRenderInfo implements IEventData {

    protected CanvasGraphicsState gs;
    private boolean graphicsStateIsPreserved;

    public AbstractRenderInfo(CanvasGraphicsState gs) {
        this.gs = gs;
    }

    @Override
    public CanvasGraphicsState getGraphicsState() {
        checkGraphicsState();
        return graphicsStateIsPreserved ? gs : new CanvasGraphicsState(gs);
    }

    public boolean isGraphicsStatePreserved() {
        return graphicsStateIsPreserved;
    }

    public void preserveGraphicsState() {
        checkGraphicsState();
        this.graphicsStateIsPreserved = true;
        gs = new CanvasGraphicsState(gs);
    }

    public void releaseGraphicsState() {
        if (!graphicsStateIsPreserved) {
            gs = null;
        }
    }


    // check if graphics state was released
    protected void checkGraphicsState() {
        if (null == gs) {
            throw new IllegalStateException(LogMessageConstant.GRAPHICS_STATE_WAS_DELETED);
        }
    }
}