| /** |
| * 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.parse; |
| |
| import org.apache.kerby.asn1.Tag; |
| |
| import java.nio.ByteBuffer; |
| |
| /** |
| * Combine multiple parts in a container into a single item, for primitive types |
| * that use constructed encoding. |
| */ |
| public class Asn1DerivedItem extends Asn1Item { |
| |
| private final Asn1Container container; |
| private final Tag newTag; |
| private int newBodyLength; |
| private ByteBuffer newBodyBuffer; |
| |
| public Asn1DerivedItem(Tag newTag, Asn1Container container) { |
| super(container.getHeader(), container.getBodyStart(), |
| container.getBuffer()); |
| |
| this.newTag = newTag; |
| this.container = container; |
| this.newBodyLength = -1; |
| } |
| |
| @Override |
| public Tag tag() { |
| return newTag; |
| } |
| |
| private int computeBodyLength() { |
| int totalLen = 0; |
| for (Asn1ParseResult parseItem : container.getChildren()) { |
| totalLen += parseItem.getBodyLength(); |
| } |
| |
| return totalLen; |
| } |
| |
| private ByteBuffer makeBodyBuffer() { |
| ByteBuffer tmpBuffer = ByteBuffer.allocate(getBodyLength()); |
| for (Asn1ParseResult parseItem : container.getChildren()) { |
| tmpBuffer.put(parseItem.getBodyBuffer()); |
| } |
| tmpBuffer.flip(); |
| |
| return tmpBuffer; |
| } |
| |
| @Override |
| public ByteBuffer getBodyBuffer() { |
| if (newBodyBuffer == null) { |
| newBodyBuffer = makeBodyBuffer(); |
| } |
| return newBodyBuffer; |
| } |
| |
| @Override |
| public int getBodyLength() { |
| if (newBodyLength == -1) { |
| newBodyLength = computeBodyLength(); |
| } |
| |
| return newBodyLength; |
| } |
| } |