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svg is a module for iText7 that allows you to integrate SVG images in your PDF creation and manipulation process
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/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2018 iText Group NV
    Authors: iText Software.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License version 3
    as published by the Free Software Foundation with the addition of the
    following permission added to Section 15 as permitted in Section 7(a):
    FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
    ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
    OF THIRD PARTY RIGHTS

    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 http://www.gnu.org/licenses or write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA, 02110-1301 USA, or download the license from the following URL:
    http://itextpdf.com/terms-of-use/

    The interactive user interfaces in modified source and object code versions
    of this program must display Appropriate Legal Notices, as required under
    Section 5 of the GNU Affero General Public License.

    In accordance with Section 7(b) of the GNU Affero General Public License,
    a covered work must retain the producer line in every PDF that is created
    or manipulated using iText.

    You can be released from the requirements of the license by purchasing
    a commercial license. Buying such a license is mandatory as soon as you
    develop commercial activities involving the iText software without
    disclosing the source code of your own applications.
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 */
package com.itextpdf.svg.processors.impl;

import com.itextpdf.svg.renderers.ISvgNodeRenderer;

import java.util.Stack;

/**
 * Internal ProcessorState representation for {@link DefaultSvgProcessor}
 */
public class ProcessorState {

    private Stack stack;

    /**
     * Instantiates the processor state.
     */
    public ProcessorState() {
        this.stack = new Stack<>();
    }

    /**
     * Returns the amount of ISvgNodeRenderers being processed.
     *
     * @return amount of ISvgNodeRenderers
     */
    public int size() {
        return this.stack.size();
    }

    /**
     * Adds an ISvgNodeRenderer to the processor's state.
     *
     * @param svgNodeRenderer renderer to be added to the state
     */
    public void push(ISvgNodeRenderer svgNodeRenderer) {
        this.stack.push(svgNodeRenderer);
    }

    /**
     * Removes and returns the first renderer of the processor state.
     *
     * @return the removed ISvgNodeRenderer object
     */
    public ISvgNodeRenderer pop() {
        return this.stack.pop();
    }

    /**
     * Returns the first ISvgNodeRenderer object without removing it.
     *
     * @return the first ISvgNodeRenderer
     */
    public ISvgNodeRenderer top() {
        return this.stack.peek();
    }

    /**
     * Returns true when the processorstate is empty, false when there is at least one ISvgNodeRenderer in the state.
     *
     * @return true if empty, false if not empty
     */
    public boolean empty() {
        return this.stack.size() == 0;
    }
}