package org.verapdf.model.impl.pb.operator.generalgs;

import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSBase;
import org.verapdf.model.coslayer.CosArray;
import org.verapdf.model.coslayer.CosReal;
import org.verapdf.model.impl.pb.cos.PBCosArray;
import org.verapdf.model.operator.Op_d;

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

/**
 * Operator, which set the line dash pattern in the graphics state
 *
 * @author Timur Kamalov
 */
public class PBOp_d extends PBOpGeneralGS implements Op_d {

    public static final String OP_D_TYPE = "Op_d";

    public static final String DASH_ARRAY = "dashArray";
    public static final String DASH_PHASE = "dashPhase";

    public PBOp_d(List<COSBase> arguments) {
        super(arguments, OP_D_TYPE);
    }

    @Override
    public List<? extends org.verapdf.model.baselayer.Object> getLinkedObjects(
            String link) {
        switch (link) {
        case DASH_ARRAY:
            return this.getDashArray();
        case DASH_PHASE:
            return this.getDashPhase();
        default:
            return super.getLinkedObjects(link);
        }
    }

    private List<CosArray> getDashArray() {
        List<CosArray> list = new ArrayList<>(OPERANDS_COUNT);
        if (this.arguments.size() > 2) {
			COSBase array = this.arguments
					.get(this.arguments.size() - 2);
			if (array instanceof COSArray) {
				list.add(new PBCosArray((COSArray) array));
			}
        }
        return list;
    }

    private List<CosReal> getDashPhase() {
        return this.getLastReal();
    }

}

package org.verapdf.model.impl.pb.operator.generalgs;

import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSBase;
import org.verapdf.model.coslayer.CosArray;
import org.verapdf.model.coslayer.CosReal;
import org.verapdf.model.impl.pb.cos.PBCosArray;
import org.verapdf.model.operator.Op_d;

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

/**
 * Operator, which set the line dash pattern in the graphics state
 *
 * @author Timur Kamalov
 */
public class PBOp_d extends PBOpGeneralGS implements Op_d {

    public static final String OP_D_TYPE = "Op_d";

    public static final String DASH_ARRAY = "dashArray";
    public static final String DASH_PHASE = "dashPhase";

    public PBOp_d(List<COSBase> arguments) {
        super(arguments, OP_D_TYPE);
    }

    @Override
    public List<? extends org.verapdf.model.baselayer.Object> getLinkedObjects(
            String link) {
        switch (link) {
        case DASH_ARRAY:
            return this.getDashArray();
        case DASH_PHASE:
            return this.getDashPhase();
        default:
            return super.getLinkedObjects(link);
        }
    }

    private List<CosArray> getDashArray() {
        List<CosArray> list = new ArrayList<>(OPERANDS_COUNT);
        if (this.arguments.size() > 1) {
			COSBase array = this.arguments
					.get(this.arguments.size() - 2);
			if (array instanceof COSArray) {
				list.add(new PBCosArray((COSArray) array));
			}
        }
        return list;
    }

    private List<CosReal> getDashPhase() {
        return this.getLastReal();
    }

}

Fix mistake for d operator