/*
 *  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
 */

package org.apache.harmony.security.x509;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import org.apache.harmony.security.asn1.ASN1SequenceOf;
import org.apache.harmony.security.asn1.ASN1Type;
import org.apache.harmony.security.asn1.BerInputStream;

/**
 * The class encapsulates the ASN.1 DER encoding/decoding work with Certificate
 * Policies structure which is a part of X.509 certificate (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>
 *   certificatePolicies ::= SEQUENCE SIZE (1..MAX) OF PolicyInformation
 * </pre>
 * 
 */

public class CertificatePolicies extends ExtensionValue {

	public static CertificatePolicies decode(byte[] encoding)
			throws IOException {
		final CertificatePolicies cps = ((CertificatePolicies) ASN1
				.decode(encoding));
		cps.encoding = encoding;
		return cps;
	}

	// the values of policyInformation field of the structure
	private List<PolicyInformation> policyInformations;

	// the ASN.1 encoded form of CertificatePolicies
	private byte[] encoding;

	/**
	 * ASN.1 DER X.509 CertificatePolicies encoder/decoder class.
	 */
	public static final ASN1Type ASN1 = new ASN1SequenceOf(
			PolicyInformation.ASN1) {

		@Override
		public Object getDecodedObject(BerInputStream in) {
			return new CertificatePolicies(
					(List<PolicyInformation>) in.content, in.getEncoded());
		}

		@Override
		public Collection<PolicyInformation> getValues(Object object) {
			final CertificatePolicies cps = (CertificatePolicies) object;
			return cps.policyInformations;
		}
	};

	/**
	 * Constructs an object representing the value of CertificatePolicies.
	 */
	public CertificatePolicies() {
	}

	/**
	 * TODO
	 * 
	 * @param policyInformations
	 *            : List
	 */
	public CertificatePolicies(List<PolicyInformation> policyInformations) {
		this.policyInformations = policyInformations;
	}

	//
	// TODO
	// @param policyInformations: List
	// @param encoding: byte[]
	//
	private CertificatePolicies(List<PolicyInformation> policyInformations,
			byte[] encoding) {
		this.policyInformations = policyInformations;
		this.encoding = encoding;
	}

	/**
	 * TODO
	 * 
	 * @param policyInformation
	 *            : PolicyInformation
	 * @return
	 */
	public CertificatePolicies addPolicyInformation(
			PolicyInformation policyInformation) {
		encoding = null;
		if (policyInformations == null) {
			policyInformations = new ArrayList<PolicyInformation>();
		}
		policyInformations.add(policyInformation);
		return this;
	}

	/**
	 * Places the string representation of extension value into the StringBuffer
	 * object.
	 */
	@Override
	public void dumpValue(StringBuffer buffer, String prefix) {
		buffer.append(prefix).append("CertificatePolicies [\n"); //$NON-NLS-1$
		for (final PolicyInformation policyInformation : policyInformations) {
			buffer.append(prefix);
			buffer.append("  "); //$NON-NLS-1$
			policyInformation.dumpValue(buffer);
			buffer.append('\n');
		}
		buffer.append(prefix).append("]\n"); //$NON-NLS-1$
	}

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

	/**
	 * Returns the values of policyInformation field of the structure.
	 * 
	 * @return policyInformations
	 */
	public List<PolicyInformation> getPolicyInformations() {
		return new ArrayList<PolicyInformation>(policyInformations);
	}
}