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Kerby ASN1 Project
There is a newer version: 2.1.0
/**
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *  
 *    http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License. 
 *  
 */
package org.apache.kerby.asn1;

import org.apache.kerby.asn1.type.Asn1Type;

/**
 * Representing a field in a ASN1 collection or choice.
 */
public class Asn1FieldInfo {
    private EnumType index;
    private int tagNo = -1; // Indicate a non-tagged field
    private boolean isImplicit;
    private Class type;

    /**
     * Constructor for a tagged field, the tagNo being the same of index.
     * @param index
     * @param type
     * @param isImplicit
     */
    public Asn1FieldInfo(EnumType index, Class type,
                         boolean isImplicit) {
        this(index, index.getValue(), type, isImplicit);
    }

    /**
     * Constructor for a tagged field.
     * @param index
     * @param tagNo
     * @param type
     * @param isImplicit
     */
    public Asn1FieldInfo(EnumType index, int tagNo, Class type,
                         boolean isImplicit) {
        this.index = index;
        this.tagNo = tagNo;
        this.type = type;
        this.isImplicit = isImplicit;
    }

    /**
     * Constructor for a non-tagged field.
     * @param index
     * @param type
     */
    public Asn1FieldInfo(EnumType index, Class type) {
        this.index = index;
        this.type = type;
        this.tagNo = -1; // Indicate a non-tagged field
    }

    public boolean isTagged() {
        return tagNo != -1;
    }

    public TaggingOption getTaggingOption() {
        if (isImplicit) {
            return TaggingOption.newImplicitContextSpecific(tagNo);
        } else {
            return TaggingOption.newExplicitContextSpecific(tagNo);
        }
    }

    public int getTagNo() {
        return tagNo;
    }

    public EnumType getIndex() {
        return index;
    }

    public boolean isImplicit() {
        return isImplicit;
    }

    public Asn1Type createFieldValue() {
        try {
            return type.newInstance();
        } catch (Exception e) {
            throw new IllegalArgumentException(
                "Bad field type provided, no default constructor?", e);
        }
    }

    public Tag getFieldTag() {
        Asn1Type fieldValue = createFieldValue();
        return fieldValue.tag();
    }
}