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veraPDF PDF/A validation model implementation based on PDF parser.
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/**
 * This file is part of veraPDF WCAG Validation, a module of the veraPDF project.
 * Copyright (c) 2015, veraPDF Consortium 
 * All rights reserved.
 *
 * veraPDF WCAG Validation is free software: you can redistribute it and/or modify
 * it under the terms of either:
 *
 * The GNU General public license GPLv3+.
 * You should have received a copy of the GNU General Public License
 * along with veraPDF WCAG Validation as the LICENSE.GPL file in the root of the source
 * tree.  If not, see http://www.gnu.org/licenses/ or
 * https://www.gnu.org/licenses/gpl-3.0.en.html.
 *
 * The Mozilla Public License MPLv2+.
 * You should have received a copy of the Mozilla Public License along with
 * veraPDF WCAG Validation as the LICENSE.MPL file in the root of the source tree.
 * If a copy of the MPL was not distributed with this file, you can obtain one at
 * http://mozilla.org/MPL/2.0/.
 */
package org.verapdf.gf.model.impl.sa;

import org.verapdf.gf.model.impl.sa.structelems.GFSAFactory;
import org.verapdf.model.GenericModelObject;
import org.verapdf.model.baselayer.Object;
import org.verapdf.model.salayer.SAStructElem;
import org.verapdf.model.salayer.SAStructTreeRoot;
import org.verapdf.wcag.algorithms.entities.INode;
import org.verapdf.wcag.algorithms.entities.ITree;

import java.util.*;

/**
 * @author Maxim Plushchov
 */
public class GFSAStructTreeRoot extends GenericModelObject implements SAStructTreeRoot, ITree {

	public static final String STRUCT_TREE_ROOT_TYPE = "SAStructTreeRoot";

	public static final String CHILDREN = "children";

	protected List children = null;

	private final INode node;

	private final org.verapdf.pd.structure.PDStructTreeRoot treeRoot;

	public GFSAStructTreeRoot(org.verapdf.pd.structure.PDStructTreeRoot treeRoot) {
		super(STRUCT_TREE_ROOT_TYPE);
		this.treeRoot = treeRoot;
		node = new GFSARoot(this);
	}

	@Override
	public List getLinkedObjects(String link) {
		switch (link) {
			case CHILDREN:
				return this.getChildren();
			default:
				return super.getLinkedObjects(link);
		}
	}

	public List getChildren() {
		if (this.children == null) {
			parseChildren();
		}
		return Collections.unmodifiableList(children);
	}

	protected void parseChildren() {
		List elements = treeRoot.getStructChildren();
		children = new ArrayList<>(elements.size());
		if (!elements.isEmpty()) {
			for (org.verapdf.pd.structure.PDStructElem element : elements) {
				GFSAStructElem structElem = GFSAFactory.createTypedStructElem(element, "");
				INode childNode = new GFSANode(structElem);
				structElem.setNode(childNode);
				node.addChild(childNode);
				children.add(structElem);
			}
		}
	}

	@Override
	public INode getRoot() {
		return node;
	}
}