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veraPDF PDF/A validation model implementation based on PDF parser.
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/**
 * This file is part of veraPDF Validation, a module of the veraPDF project.
 * Copyright (c) 2015, veraPDF Consortium 
 * All rights reserved.
 *
 * veraPDF 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 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 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.pd;

import org.verapdf.as.ASAtom;
import org.verapdf.cos.COSObjType;
import org.verapdf.cos.COSObject;
import org.verapdf.cos.COSString;
import org.verapdf.gf.model.impl.cos.GFCosTextString;
import org.verapdf.gf.model.impl.pd.actions.GFPDAction;
import org.verapdf.model.baselayer.Object;
import org.verapdf.model.coslayer.CosTextString;
import org.verapdf.model.pdlayer.PDAction;
import org.verapdf.model.pdlayer.PDDestination;
import org.verapdf.model.pdlayer.PDOutline;
import org.verapdf.pd.PDOutlineItem;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * @author Maksim Bezrukov
 */
public class GFPDOutline extends GFPDObject implements PDOutline {

	public static final String OUTLINE_TYPE = "PDOutline";

	public static final String TITLE = "Title";
	public static final String ACTION = "A";
	public static final String DEST = "Dest";

	private final String id;

	public GFPDOutline(PDOutlineItem simplePDObject, String id) {
		super(simplePDObject, OUTLINE_TYPE);
		this.id = id;
	}

	@Override
	public String getID() {
		return this.id;
	}

	@Override
	public List getLinkedObjects(String link) {
		switch (link) {
			case ACTION:
				return this.getAction();
			case DEST:
				return this.getDestination();
			case TITLE:
				return this.getTitle();	
			default:
				return super.getLinkedObjects(link);
		}
	}

	private List getAction() {
		org.verapdf.pd.actions.PDAction action = ((PDOutlineItem) this.simplePDObject).getAction();
		if (action != null) {
			List actions = new ArrayList<>(MAX_NUMBER_OF_ELEMENTS);
			PDAction pdAction = GFPDAction.getAction(action);
			actions.add(pdAction);
			return Collections.unmodifiableList(actions);
		}
		return Collections.emptyList();
	}

	private List getDestination() {
		COSObject destination = ((PDOutlineItem) simplePDObject).getDestination();
		if (!destination.empty() && !simplePDObject.knownKey(ASAtom.A)) {
			List destinations = new ArrayList<>(MAX_NUMBER_OF_ELEMENTS);
			destinations.add(new GFPDDestination(new org.verapdf.pd.PDDestination(destination)));
			return Collections.unmodifiableList(destinations);
		}
		return Collections.emptyList();
	}

	private List getTitle() {
		COSObject title = this.simplePDObject.getKey(ASAtom.TITLE);
		if (title != null && title.getType() == COSObjType.COS_STRING) {
			List list = new ArrayList<>(MAX_NUMBER_OF_ELEMENTS);
			list.add(new GFCosTextString((COSString) title.getDirectBase()));
			return Collections.unmodifiableList(list);
		}
		return Collections.emptyList();
	}
}