Asn1Collection.java

package org.apache.haox.asn1.type;

import org.apache.haox.asn1.EncodingOption;
import org.apache.haox.asn1.LimitedByteBuffer;
import org.apache.haox.asn1.TagClass;
import org.apache.haox.asn1.UniversalTag;

import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;

public class Asn1Collection extends AbstractAsn1Type<List<Asn1Item>>
{
    public Asn1Collection(TagClass tagClass, int tagNo) {
        super(tagClass, tagNo);
        setValue(new ArrayList<Asn1Item>());
        setEncodingOption(EncodingOption.CONSTRUCTED);
    }

    @Override
    public boolean isConstructed() {
        return true;
    }

    public void addItem(Asn1Type value) {
        if (value instanceof Asn1Item) {
            getValue().add((Asn1Item) value);
        } else {
            getValue().add(new Asn1Item(value));
        }
    }

    public void clear() {
        getValue().clear();
    }

    @Override
    protected int encodingBodyLength() {
        List<Asn1Item> valueItems = getValue();
        int allLen = 0;
        for (Asn1Item item : valueItems) {
            if (item != null) {
                allLen += item.encodingLength();
            }
        }
        return allLen;
    }

    @Override
    protected void encodeBody(ByteBuffer buffer) {
        List<Asn1Item> valueItems = getValue();
        for (Asn1Item item : valueItems) {
            if (item != null) {
                item.encode(buffer);
            }
        }
    }

    @Override
    protected void decodeBody(LimitedByteBuffer content) throws IOException {
        while (content.available()) {
            Asn1Type aValue = decodeOne(content);
            if (aValue != null) {
                if (aValue instanceof Asn1Item) {
                    addItem((Asn1Item) aValue);
                } else {
                    addItem(aValue);
                }
            } else {
                throw new RuntimeException("Unexpected running into here");
            }
        }
    }

    public static boolean isCollection(int tagNo) {
        return isCollection(UniversalTag.fromValue(tagNo));
    }

    public static boolean isCollection(UniversalTag tagNo) {
        switch (tagNo) {
            case SEQUENCE:
            case SEQUENCE_OF:
            case SET:
            case SET_OF:
                return true;
            default:
                return false;
        }
    }

    public static Asn1Type createCollection(int tagNo) {
        if (! isCollection(tagNo)) {
            throw new IllegalArgumentException("Not collection type, tag: " + tagNo);
        }
        return createCollection(UniversalTag.fromValue(tagNo));
    }

    public static Asn1Type createCollection(UniversalTag tagNo) {
        if (! isCollection(tagNo)) {
            throw new IllegalArgumentException("Not collection type, tag: " + tagNo);
        }

        switch (tagNo) {
            case SEQUENCE:
                return new Asn1Sequence();
            case SEQUENCE_OF:
                return new Asn1Sequence();
            case SET:
                return new Asn1Set();
            case SET_OF:
                return new Asn1Set();
            default:
                throw new IllegalArgumentException("Unexpected tag " + tagNo.getValue());
        }
    }

}