| /** |
| * 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.xdr.type; |
| |
| import org.apache.kerby.xdr.XdrDataType; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| |
| /** |
| * Xdr simple type, of single value other than complex type of multiple values. |
| * Including: Bytes, Integer, Boolean, String. |
| * Use toBytes() for encoding, toValue() for decoding. |
| */ |
| public abstract class XdrSimple<T> extends AbstractXdrType<T> { |
| private byte[] bytes; |
| |
| /** |
| * Default constructor, generally for decoding as a value container |
| * @param dataTypeNo The dataType number |
| */ |
| public XdrSimple(XdrDataType dataTypeNo) { |
| this(dataTypeNo, null); |
| } |
| |
| /** |
| * Constructor with a value, generally for encoding of the value |
| * @param xdrDataType The dataType number |
| * @param value The value |
| */ |
| public XdrSimple(XdrDataType xdrDataType, T value) { |
| super(xdrDataType, value); |
| } |
| |
| protected byte[] getBytes() { |
| return bytes; |
| } |
| |
| protected void setBytes(byte[] bytes) { |
| if (bytes != null) { |
| this.bytes = bytes.clone(); |
| } else { |
| this.bytes = null; |
| } |
| } |
| |
| protected byte[] encodeBody() throws IOException { |
| if (bytes == null) { |
| /**Terminal step for encoding all the simple type to bytes.*/ |
| toBytes(); |
| } |
| return bytes; |
| } |
| |
| /** |
| * Put encoded bytes into buffer. |
| * @param buffer ByteBuffer to hold encoded bytes. |
| */ |
| @Override |
| protected void encodeBody(ByteBuffer buffer) throws IOException { |
| byte[] body = encodeBody(); |
| if (body != null) { |
| buffer.put(body); |
| } |
| } |
| |
| /** |
| * Length including null bytes to maintain an multiple of 4. |
| * @return The encoding body length |
| */ |
| @Override |
| protected int encodingBodyLength() throws IOException { |
| if (getValue() == null) { |
| return 0; |
| } |
| if (bytes == null) { |
| /**Terminal step for decoding all the simple type to bytes.*/ |
| toBytes(); |
| } |
| return bytes.length; |
| } |
| |
| @Override |
| public void decode(ByteBuffer content) throws IOException { |
| decodeBody(content); |
| } |
| |
| protected void decodeBody(ByteBuffer body) throws IOException { |
| byte[] result = body.array(); |
| if (result.length > 0) { |
| setBytes(result); |
| /**Terminal step for decoding all the bytes into simple types.*/ |
| toValue(); |
| } |
| } |
| |
| /** |
| * Decode bytes to simple value. |
| */ |
| protected abstract void toValue() throws IOException; |
| |
| /** |
| * Encode simple type to bytes. |
| * @throws IOException e |
| */ |
| protected abstract void toBytes() throws IOException; |
| |
| public static boolean isSimple(XdrDataType dataType) { |
| switch (dataType) { |
| case BOOLEAN: |
| case INTEGER: |
| case UNSIGNED_INTEGER: |
| case ENUM: |
| case STRING: |
| return true; |
| default: |
| return false; |
| } |
| } |
| } |