/*
 *  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.
 */

/**
* @author Alexander Y. Kleymenov
* @version $Revision$
*/

package org.apache.harmony.security.x509;

import org.apache.harmony.security.asn1.ASN1Any;
import org.apache.harmony.security.asn1.ASN1Oid;
import org.apache.harmony.security.asn1.ASN1Sequence;
import org.apache.harmony.security.asn1.ASN1Type;
import org.apache.harmony.security.asn1.BerInputStream;
import org.apache.harmony.security.asn1.ObjectIdentifier;

/**
 * The class encapsulates the ASN.1 DER encoding/decoding work 
 * with PolicyInformation structure which is a subpart of certificatePolicies
 * (as specified in RFC 3280 -
 *  Internet X.509 Public Key Infrastructure.
 *  Certificate and Certificate Revocation List (CRL) Profile.
 *  http://www.ietf.org/rfc/rfc3280.txt):
 *   
 * <pre>
 *  PolicyInformation ::= SEQUENCE {
 *       policyIdentifier   CertPolicyId,
 *       policyQualifiers   SEQUENCE SIZE (1..MAX) OF
 *                               PolicyQualifierInfo OPTIONAL 
 *  }
 * </pre>
 * 
 * TODO: This class is not fully implemented, implemented only work
 * with OIDs.
 */

public class PolicyInformation {

    // the value of policyIdentifier field of the structure
    private String policyIdentifier;
    // the ASN.1 encoded form of PolicyInformation
    private byte[] encoding;
    
    /**
     * TODO
     * @param   policyIdentifier:   String
     */
    public PolicyInformation(String policyIdentifier) {
        this.policyIdentifier = policyIdentifier;
    }

    /**
     * Returns the value of policyIdentifier field of the structure.
     * @return  policyIdentifier
     */
    public String getPolicyIdentifier() {
        return policyIdentifier;
    }

    /**
     * Returns ASN.1 encoded form of this X.509 PolicyInformation value.
     * @return a byte array containing ASN.1 encode form.
     */
    public byte[] getEncoded() {
        if (encoding == null) {
            encoding = ASN1.encode(this);
        }
        return encoding;
    }

    /**
     * Places the string representation of extension value 
     * into the StringBuffer object.
     */
    public void dumpValue(StringBuffer buffer) {
        buffer.append("Policy Identifier [") //$NON-NLS-1$
            .append(policyIdentifier).append(']');
    }

    /**
     * ASN.1 DER X.509 PolicyInformation encoder/decoder class.
     */
    public static final ASN1Sequence ASN1 = new ASN1Sequence(
            new ASN1Type[] { ASN1Oid.getInstance(), ASN1Any.getInstance() }) {
        {
            setOptional(1);
        }

        protected Object getDecodedObject(BerInputStream in) {
            Object[] values = (Object[]) in.content;
            return new PolicyInformation(ObjectIdentifier
                    .toString((int[]) values[0]));
        }

        protected void getValues(Object object, Object[] values) {

            PolicyInformation pi = (PolicyInformation) object;

            values[0] = ObjectIdentifier.toIntArray(pi.policyIdentifier);
        }
    };
}