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/*
 * Copyright 1999-2010 University of Chicago
 *
 * Licensed 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.globus.gsi;

import org.globus.util.I18n;

/**
 * Represents an X.509 extension. It is used to create X.509 extensions
 * and pass them in a map during certificate generation.
 */
public class X509Extension {

    protected boolean critical;
    protected byte[] value;
    protected String oid;

    private static I18n i18n =
        I18n.getI18n("org.globus.gsi.errors",
                     X509Extension.class.getClassLoader());

    /**
     * Creates a X509Extension object with specified oid.
     * The extension has no value and is marked as noncritical.
     *
     * @param oid the oid of the extension
     */
    public X509Extension(String oid) {
	this(oid, false, null);
    }

    /**
     * Creates a X509Extension object with specified oid and value.
     * The extension is marked as noncritical.
     *
     * @param oid the oid of the extension
     * @param value the actual value of the extension (not octet string
     *        encoded). The value can be null.
     */
    public X509Extension(String oid, byte[] value) {
	this(oid, false, value);
    }

    /**
     * Creates a X509Extension object with specified oid, critical property,
     * and value.
     *
     * @param oid the oid of the extension
     * @param critical the critical value.
     * @param value the actual value of the extension (not octet string
     *        encoded). The value can be null.
     */
    public X509Extension(String oid, boolean critical, byte[] value) {
	if (oid == null) {
	    throw new IllegalArgumentException(i18n.getMessage("oidNull"));
	}
	this.oid = oid;
	this.critical = critical;
	this.value = value;
    }

    /**
     * Sets the oid of this extension.
     *
     * @param oid the oid of this extension. Cannot not null.
     */
    public void setOid(String oid) {
	if (oid == null) {
	    throw new IllegalArgumentException(i18n.getMessage("oidNull"));
	}
	this.oid = oid;
    }

    /**
     * Returns the oid of this extension.
     *
     * @return the oid of this extension. Always non-null.
     */
    public String getOid() {
	return this.oid;
    }

    /**
     * Sets the extension as critical or noncritical.
     *
     * @param critical the critical value.
     */
    public void setCritical(boolean critical) {
	this.critical = critical;
    }

    /**
     * Determines whether or not this extension is critical.
     *
     * @return true if extension is critical, false otherwise.
     */
    public boolean isCritical() {
	return this.critical;
    }

    /**
     * Sets the actual value of the extension (not octet string encoded).
     *
     * @param value the actual value of the extension. Can be null.
     */
    public void setValue(byte [] value) {
	this.value = value;
    }

    /**
     * Returns the actual value of the extension (not octet string encoded)
     *
     * @return the actual value of the extension (not octet string encoded).
     *         Null if value not set.
     */
    public byte[] getValue() {
	return this.value;
    }
}