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package sun.security.x509;

import java.io.IOException;
import java.io.OutputStream;
import java.util.*;

import sun.security.util.*;


Represent the Policy Mappings Extension.
This extension, if present, identifies the certificate policies considered
identical between the issuing and the subject CA.

Extensions are addiitonal attributes which can be inserted in a X509
v3 certificate. For example a "Driving License Certificate" could have
the driving license number as a extension.

Extensions are represented as a sequence of the extension identifier
(Object Identifier), a boolean flag stating whether the extension is to
be treated as being critical and the extension value itself (this is again
a DER encoding of the extension value).

Author:Amit Kapoor, Hemma Prafullchandra
See Also:
/**
 * Represent the Policy Mappings Extension.
 *
 * This extension, if present, identifies the certificate policies considered
 * identical between the issuing and the subject CA.
 * <p>Extensions are addiitonal attributes which can be inserted in a X509
 * v3 certificate. For example a "Driving License Certificate" could have
 * the driving license number as a extension.
 *
 * <p>Extensions are represented as a sequence of the extension identifier
 * (Object Identifier), a boolean flag stating whether the extension is to
 * be treated as being critical and the extension value itself (this is again
 * a DER encoding of the extension value).
 *
 * @author Amit Kapoor
 * @author Hemma Prafullchandra
 * @see Extension
 * @see CertAttrSet
 */
public class PolicyMappingsExtension extends Extension
implements CertAttrSet<String> {
    
Identifier for this attribute, to be used with the
get, set, delete methods of Certificate, x509 type.

/**
     * Identifier for this attribute, to be used with the
     * get, set, delete methods of Certificate, x509 type.
     */
    public static final String IDENT = "x509.info.extensions.PolicyMappings";
    
Attribute names.

/**
     * Attribute names.
     */
    public static final String NAME = "PolicyMappings";
    public static final String MAP = "map";

    // Private data members
    private List<CertificatePolicyMap> maps;

    // Encode this extension value
    private void encodeThis() throws IOException {
        if (maps == null || maps.isEmpty()) {
            this.extensionValue = null;
            return;
        }
        DerOutputStream os = new DerOutputStream();
        DerOutputStream tmp = new DerOutputStream();

        for (CertificatePolicyMap map : maps) {
            map.encode(tmp);
        }

        os.write(DerValue.tag_Sequence, tmp);
        this.extensionValue = os.toByteArray();
    }

    
Create a PolicyMappings with the List of CertificatePolicyMap.

Params:
  • maps – the List of CertificatePolicyMap.
/**
     * Create a PolicyMappings with the List of CertificatePolicyMap.
     *
     * @param maps the List of CertificatePolicyMap.
     */
    public PolicyMappingsExtension(List<CertificatePolicyMap> map)
            throws IOException {
        this.maps = map;
        this.extensionId = PKIXExtensions.PolicyMappings_Id;
        this.critical = false;
        encodeThis();
    }

    
Create a default PolicyMappingsExtension.

/**
     * Create a default PolicyMappingsExtension.
     */
    public PolicyMappingsExtension() {
        extensionId = PKIXExtensions.KeyUsage_Id;
        critical = false;
        maps = Collections.<CertificatePolicyMap>emptyList();
    }

    
Create the extension from the passed DER encoded value.

Throws:
@paramscritical true if the extension is to be treated as critical.
@paramsvalue an array of DER encoded bytes of the actual value.
/**
     * Create the extension from the passed DER encoded value.
     *
     * @params critical true if the extension is to be treated as critical.
     * @params value an array of DER encoded bytes of the actual value.
     * @exception ClassCastException if value is not an array of bytes
     * @exception IOException on error.
     */
    public PolicyMappingsExtension(Boolean critical, Object value)
    throws IOException {
        this.extensionId = PKIXExtensions.PolicyMappings_Id;
        this.critical = critical.booleanValue();

        this.extensionValue = (byte[]) value;
        DerValue val = new DerValue(this.extensionValue);
        if (val.tag != DerValue.tag_Sequence) {
            throw new IOException("Invalid encoding for " +
                                  "PolicyMappingsExtension.");
        }
        maps = new ArrayList<CertificatePolicyMap>();
        while (val.data.available() != 0) {
            DerValue seq = val.data.getDerValue();
            CertificatePolicyMap map = new CertificatePolicyMap(seq);
            maps.add(map);
        }
    }

    
Returns a printable representation of the policy map.

/**
     * Returns a printable representation of the policy map.
     */
    public String toString() {
        if (maps == null) return "";
        String s = super.toString() + "PolicyMappings [\n"
                 + maps.toString() + "]\n";

        return (s);
    }

    
Write the extension to the OutputStream.

Params:
  • out – the OutputStream to write the extension to.
Throws:
/**
     * Write the extension to the OutputStream.
     *
     * @param out the OutputStream to write the extension to.
     * @exception IOException on encoding errors.
     */
    public void encode(OutputStream out) throws IOException {
        DerOutputStream tmp = new DerOutputStream();
        if (extensionValue == null) {
            extensionId = PKIXExtensions.PolicyMappings_Id;
            critical = false;
            encodeThis();
        }
        super.encode(tmp);
        out.write(tmp.toByteArray());
    }

    
Set the attribute value.

/**
     * Set the attribute value.
     */
    @SuppressWarnings("unchecked") // Checked with instanceof
    public void set(String name, Object obj) throws IOException {
        if (name.equalsIgnoreCase(MAP)) {
            if (!(obj instanceof List)) {
              throw new IOException("Attribute value should be of" +
                                    " type List.");
            }
            maps = (List<CertificatePolicyMap>)obj;
        } else {
          throw new IOException("Attribute name not recognized by " +
                        "CertAttrSet:PolicyMappingsExtension.");
        }
        encodeThis();
    }

    
Get the attribute value.

/**
     * Get the attribute value.
     */
    public List<CertificatePolicyMap> get(String name) throws IOException {
        if (name.equalsIgnoreCase(MAP)) {
            return (maps);
        } else {
          throw new IOException("Attribute name not recognized by " +
                        "CertAttrSet:PolicyMappingsExtension.");
        }
    }

    
Delete the attribute value.

/**
     * Delete the attribute value.
     */
    public void delete(String name) throws IOException {
        if (name.equalsIgnoreCase(MAP)) {
            maps = null;
        } else {
          throw new IOException("Attribute name not recognized by " +
                        "CertAttrSet:PolicyMappingsExtension.");
        }
        encodeThis();
    }

    
Return an enumeration of names of attributes existing within this
attribute.

/**
     * Return an enumeration of names of attributes existing within this
     * attribute.
     */
    public Enumeration<String> getElements () {
        AttributeNameEnumeration elements = new AttributeNameEnumeration();
        elements.addElement(MAP);

        return elements.elements();
    }

    
Return the name of this attribute.

/**
     * Return the name of this attribute.
     */
    public String getName () {
        return (NAME);
    }
}