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Diffstat (limited to 'qpid/java/common/src/main/java/org/apache/qpid/transport/codec/Decoder.java')
| -rw-r--r-- | qpid/java/common/src/main/java/org/apache/qpid/transport/codec/Decoder.java | 283 |
1 files changed, 283 insertions, 0 deletions
diff --git a/qpid/java/common/src/main/java/org/apache/qpid/transport/codec/Decoder.java b/qpid/java/common/src/main/java/org/apache/qpid/transport/codec/Decoder.java new file mode 100644 index 0000000000..a4df5b5fcb --- /dev/null +++ b/qpid/java/common/src/main/java/org/apache/qpid/transport/codec/Decoder.java @@ -0,0 +1,283 @@ +/* + * + * 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.qpid.transport.codec; + +import java.util.List; +import java.util.Map; +import java.util.UUID; + +import org.apache.qpid.transport.RangeSet; +import org.apache.qpid.transport.Struct; + + +/** + * Decoder interface. + * Each concrete implementor must specify how to decode given values. + * + * @author Rafael H. Schloming + */ +public interface Decoder +{ + /** + * Tells whether there are any remaining byte(s) to be read. + * + * @return true if there are remaining bytes, false otherwise. + */ + boolean hasRemaining(); + + /** + * The uint8 type is an 8-bit unsigned integral value. + * + * @return an 8-bit unsigned integral value. + */ + short readUint8(); + + /** + *The uint16 type is a 16-bit unsigned integral value encoded in network byte order. + * + * @return a 16-bit unsigned integral value encoded in network byte order. + */ + int readUint16(); + + /** + *The uint32 type is a 32-bit unsigned integral value encoded in network byte order. + * + * @return a 32-bit unsigned integral value encoded in network byte order. + */ + long readUint32(); + + /** + * The uint64 type is a 64-bit unsigned integral value encoded in network byte order. + * + * @return a 64-bit unsigned integral value encoded in network byte order. + */ + long readUint64(); + + /** + * The datetime type encodes a date and time using the 64 bit POSIX time_t format. + * + * @return a date and time using the 64 bit POSIX time_t format. + */ + long readDatetime(); + + /** + * The uuid type encodes a universally unique id as defined by RFC-4122. + * The format and operations for this type can be found in section 4.1.2 of RFC-4122. + * + * return a universally unique id as defined by RFC-4122. + */ + UUID readUuid(); + + /** +// *The sequence-no type encodes, in network byte order, a serial number as defined in RFC-1982. + * + * @return a serial number as defined in RFC-1982. + */ + int readSequenceNo(); + + RangeSet readSequenceSet(); // XXX + RangeSet readByteRanges(); // XXX + + /** + * The str8 type encodes up to 255 octets worth of UTF-8 unicode. + * The number of octets of unicode is first encoded as an 8-bit unsigned integral value. + * This is followed by the actual UTF-8 unicode. + * Note that the encoded size refers to the number of octets of unicode, not necessarily the number of characters since + * the UTF-8 unicode may include multi-byte character sequences. + * + * @return a string. + */ + String readStr8(); + + /** + * The str16 type encodes up to 65535 octets worth of UTF-8 unicode. + * The number of octets is first encoded as a 16-bit unsigned integral value in network byte order. + * This is followed by the actual UTF-8 unicode. + * Note that the encoded size refers to the number of octets of unicode, not necessarily the number of unicode + * characters since the UTF-8 unicode may include multi-byte character sequences. + * + * return a string. + */ + String readStr16(); + + /** + * The vbin8 type encodes up to 255 octets of opaque binary data. + * + * return a byte array. + */ + byte[] readVbin8(); + + /** + * The vbin16 type encodes up to 65535 octets of opaque binary data. + * + * @return the corresponding byte array. + */ + byte[] readVbin16(); + + /** + * The vbin32 type encodes up to 4294967295 octets of opaque binary data. + * + * @return the corresponding byte array. + */ + byte[] readVbin32(); + + /** + * The struct32 type describes any coded struct with a 32-bit (4 octet) size. + * The type is restricted to be only coded structs with a 32-bit size, consequently the first six octets of any encoded + * value for this type MUST always contain the size, class-code, and struct-code in that order. + * The size is encoded as a 32-bit unsigned integral value in network byte order that is equal to the size of the + * encoded field-data, packing-flags, class-code, and struct-code. The class-code is a single octet that may be set to any + * valid class code. + * The struct-code is a single octet that may be set to any valid struct code within the given class-code. + * The first six octets are then followed by the packing flags and encoded field data. + * The presence and quantity of packingflags, as well as the specific fields are determined by the struct definition + * identified with the encoded class-code and struct-code. + * + * @return the decoded struct. + */ + Struct readStruct32(); + + /** + * A map is a set of distinct keys where each key has an associated (type,value) pair. + * The triple of the key, type, and value, form an entry within a map. Each entry within a given map MUST have a + * distinct key. + * A map is encoded as a size in octets, a count of the number of entries, followed by the encoded entries themselves. + * An encoded map may contain up to (4294967295 - 4) octets worth of encoded entries. + * The size is encoded as a 32-bit unsigned integral value in network byte order equal to the number of octets worth of + * encoded entries plus 4. (The extra 4 octets is added for the entry count.) + * The size is then followed by the number of entries encoded as a 32-bit unsigned integral value in network byte order. + * Finally the entries are encoded sequentially. + * An entry is encoded as the key, followed by the type, and then the value. The key is always a string encoded as a str8. + * The type is a single octet that may contain any valid AMQP type code. + * The value is encoded according to the rules defined by the type code for that entry. + * + * @return the decoded map. + */ + Map<String,Object> readMap(); + + /** + * A list is an ordered sequence of (type, value) pairs. The (type, value) pair forms an item within the list. + * The list may contain items of many distinct types. A list is encoded as a size in octets, followed by a count of the + * number of items, followed by the items themselves encoded in their defined order. + * An encoded list may contain up to (4294967295 - 4) octets worth of encoded items. + * The size is encoded as a 32-bit unsigned integral value in network byte order equal to the number of octets worth + * of encoded items plus 4. (The extra4 octets is added for the item count.) + * The size is then followed by the number of items encoded as a 32-bit unsigned integral value in network byte order. + * Finally the items are encoded sequentially in their defined order. + * An item is encoded as the type followed by the value. The type is a single octet that may contain any valid AMQP type + * code. + * The value is encoded according to the rules defined by the type code for that item. + * + * @return the decoded list. + */ + List<Object> readList(); + + /** + * An array is an ordered sequence of values of the same type. + * The array is encoded in as a size in octets, followed by a type code, then a count of the number values in the array, + * and finally the values encoded in their defined order. + * An encoded array may contain up to (4294967295 - 5) octets worth of encoded values. + * The size is encoded as a 32-bit unsigned integral value in network byte order equal to the number of octets worth of + * encoded values plus 5. (The extra 5 octets consist of 4 octets for the count of the number of values, and one octet to + * hold the type code for the items inthe array.) + * The size is then followed by a single octet that may contain any valid AMQP type code. + * The type code is then followed by the number of values encoded as a 32-bit unsigned integral value in network byte + * order. + * Finally the values are encoded sequentially in their defined order according to the rules defined by the type code for + * the array. + * + * @return the decoded array. + */ + List<Object> readArray(); + + /** + * + * @param type the type of the struct. + * @return the decoded struct. + */ + Struct readStruct(int type); + + /** + * The float type encodes a single precision 32-bit floating point number. + * The format and operations are defined by the IEEE 754 standard for 32-bit single precision floating point numbers. + * + * @return the decoded float. + */ + float readFloat(); + + /** + * The double type encodes a double precision 64-bit floating point number. + * The format and operations are defined by the IEEE 754 standard for 64-bit double precision floating point numbers. + * + * @return the decoded double + */ + double readDouble(); + + /** + * The int8 type is a signed integral value encoded using an 8-bit two's complement representation. + * + * @return the decoded integer. + */ + byte readInt8(); + + /** + * The int16 type is a signed integral value encoded using a 16-bit two's complement representation in network byte order. + * + * @return the decoded integer. + */ + short readInt16(); + + /** + * The int32 type is a signed integral value encoded using a 32-bit two's complement representation in network byte order. + * + * @return the decoded integer. + */ + int readInt32(); + + /** + * The int64 type is a signed integral value encoded using a 64-bit two's complement representation in network byte order. + * + * @return the decoded integer (as long). + */ + long readInt64(); + + /** + * The bin128 type consists of 16 consecutive octets of opaque binary data. + * + * @return the decoded byte array. + */ + byte [] readBin128(); + + /** + * Reads the remaining bytes on the underlying buffer. + * + * @return the remaining bytes on the underlying buffer. + */ + byte[] readReaminingBytes (); + + /** + * Reads the given number of bytes. + * + * @param howManyBytes how many bytes need to be read? + * @return a byte array containing the requested data. + */ + byte[] readBytes (int howManyBytes); +}
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