diff options
Diffstat (limited to 'trunk/qpid/java/common/src/main/java/org/apache/qpid/transport/codec/AbstractEncoder.java')
| -rw-r--r-- | trunk/qpid/java/common/src/main/java/org/apache/qpid/transport/codec/AbstractEncoder.java | 620 |
1 files changed, 620 insertions, 0 deletions
diff --git a/trunk/qpid/java/common/src/main/java/org/apache/qpid/transport/codec/AbstractEncoder.java b/trunk/qpid/java/common/src/main/java/org/apache/qpid/transport/codec/AbstractEncoder.java new file mode 100644 index 0000000000..908d14a307 --- /dev/null +++ b/trunk/qpid/java/common/src/main/java/org/apache/qpid/transport/codec/AbstractEncoder.java @@ -0,0 +1,620 @@ +/* + * + * 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.io.UnsupportedEncodingException; + +import java.nio.ByteBuffer; + +import java.util.Collections; +import java.util.HashMap; +import java.util.LinkedHashMap; +import java.util.List; +import java.util.Map; +import java.util.UUID; + +import org.apache.qpid.transport.Range; +import org.apache.qpid.transport.RangeSet; +import org.apache.qpid.transport.Struct; +import org.apache.qpid.transport.Type; + +import static org.apache.qpid.transport.util.Functions.*; + + +/** + * AbstractEncoder + * + * @author Rafael H. Schloming + */ + +abstract class AbstractEncoder implements Encoder +{ + + private static Map<Class<?>,Type> ENCODINGS = new HashMap<Class<?>,Type>(); + static + { + ENCODINGS.put(Boolean.class, Type.BOOLEAN); + ENCODINGS.put(String.class, Type.STR16); + ENCODINGS.put(Long.class, Type.INT64); + ENCODINGS.put(Integer.class, Type.INT32); + ENCODINGS.put(Short.class, Type.INT16); + ENCODINGS.put(Byte.class, Type.INT8); + ENCODINGS.put(Map.class, Type.MAP); + ENCODINGS.put(List.class, Type.LIST); + ENCODINGS.put(Float.class, Type.FLOAT); + ENCODINGS.put(Double.class, Type.DOUBLE); + ENCODINGS.put(Character.class, Type.CHAR); + ENCODINGS.put(byte[].class, Type.VBIN32); + } + + private final Map<String,byte[]> str8cache = new LinkedHashMap<String,byte[]>() + { + @Override protected boolean removeEldestEntry(Map.Entry<String,byte[]> me) + { + return size() > 4*1024; + } + }; + + protected abstract void doPut(byte b); + + protected abstract void doPut(ByteBuffer src); + + protected void put(byte b) + { + doPut(b); + } + + protected void put(ByteBuffer src) + { + doPut(src); + } + + protected void put(byte[] bytes) + { + put(ByteBuffer.wrap(bytes)); + } + + protected abstract int beginSize8(); + protected abstract void endSize8(int pos); + + protected abstract int beginSize16(); + protected abstract void endSize16(int pos); + + protected abstract int beginSize32(); + protected abstract void endSize32(int pos); + + public void writeUint8(short b) + { + assert b < 0x100; + + put((byte) b); + } + + public void writeUint16(int s) + { + assert s < 0x10000; + + put(lsb(s >>> 8)); + put(lsb(s)); + } + + public void writeUint32(long i) + { + assert i < 0x100000000L; + + put(lsb(i >>> 24)); + put(lsb(i >>> 16)); + put(lsb(i >>> 8)); + put(lsb(i)); + } + + public void writeSequenceNo(int i) + { + writeUint32(i); + } + + public void writeUint64(long l) + { + for (int i = 0; i < 8; i++) + { + put(lsb(l >> (56 - i*8))); + } + } + + + public void writeDatetime(long l) + { + writeUint64(l); + } + + private static final byte[] encode(String s, String charset) + { + try + { + return s.getBytes(charset); + } + catch (UnsupportedEncodingException e) + { + throw new RuntimeException(e); + } + } + + public void writeStr8(String s) + { + if (s == null) + { + s = ""; + } + + byte[] bytes = str8cache.get(s); + if (bytes == null) + { + bytes = encode(s, "UTF-8"); + str8cache.put(s, bytes); + } + writeUint8((short) bytes.length); + put(bytes); + } + + public void writeStr16(String s) + { + if (s == null) + { + s = ""; + } + + byte[] bytes = encode(s, "UTF-8"); + writeUint16(bytes.length); + put(bytes); + } + + public void writeVbin8(byte[] bytes) + { + if (bytes == null) { bytes = new byte[0]; } + if (bytes.length > 255) + { + throw new IllegalArgumentException("array too long: " + bytes.length); + } + writeUint8((short) bytes.length); + put(ByteBuffer.wrap(bytes)); + } + + public void writeVbin16(byte[] bytes) + { + if (bytes == null) { bytes = new byte[0]; } + writeUint16(bytes.length); + put(ByteBuffer.wrap(bytes)); + } + + public void writeVbin32(byte[] bytes) + { + if (bytes == null) { bytes = new byte[0]; } + writeUint32(bytes.length); + put(ByteBuffer.wrap(bytes)); + } + + public void writeSequenceSet(RangeSet ranges) + { + if (ranges == null) + { + writeUint16((short) 0); + } + else + { + writeUint16(ranges.size() * 8); + for (Range range : ranges) + { + writeSequenceNo(range.getLower()); + writeSequenceNo(range.getUpper()); + } + } + } + + public void writeByteRanges(RangeSet ranges) + { + throw new Error("not implemented"); + } + + public void writeUuid(UUID uuid) + { + long msb = 0; + long lsb = 0; + if (uuid != null) + { + msb = uuid.getMostSignificantBits(); + lsb = uuid.getLeastSignificantBits(); + } + writeUint64(msb); + writeUint64(lsb); + } + + public void writeStruct(int type, Struct s) + { + boolean empty = false; + if (s == null) + { + s = Struct.create(type); + empty = true; + } + + int width = s.getSizeWidth(); + int pos = -1; + if (width > 0) + { + pos = beginSize(width); + } + + if (type > 0) + { + writeUint16(type); + } + + s.write(this); + + if (width > 0) + { + endSize(width, pos); + } + } + + public void writeStruct32(Struct s) + { + if (s == null) + { + writeUint32(0); + } + else + { + int pos = beginSize32(); + writeUint16(s.getEncodedType()); + s.write(this); + endSize32(pos); + } + } + + private Type encoding(Object value) + { + if (value == null) + { + return Type.VOID; + } + + Class klass = value.getClass(); + Type type = resolve(klass); + + if (type == null) + { + throw new IllegalArgumentException + ("unable to resolve type: " + klass + ", " + value); + } + else + { + return type; + } + } + + static final Type resolve(Class klass) + { + Type type = ENCODINGS.get(klass); + if (type != null) + { + return type; + } + + Class sup = klass.getSuperclass(); + if (sup != null) + { + type = resolve(klass.getSuperclass()); + + if (type != null) + { + return type; + } + } + + for (Class iface : klass.getInterfaces()) + { + type = resolve(iface); + if (type != null) + { + return type; + } + } + + return null; + } + + public void writeMap(Map<String,Object> map) + { + int pos = beginSize32(); + if (map != null) + { + writeUint32(map.size()); + writeMapEntries(map); + } + endSize32(pos); + } + + protected void writeMapEntries(Map<String,Object> map) + { + for (Map.Entry<String,Object> entry : map.entrySet()) + { + String key = entry.getKey(); + Object value = entry.getValue(); + Type type = encoding(value); + writeStr8(key); + put(type.code); + write(type, value); + } + } + + public void writeList(List<Object> list) + { + int pos = beginSize32(); + if (list != null) + { + writeUint32(list.size()); + writeListEntries(list); + } + endSize32(pos); + } + + protected void writeListEntries(List<Object> list) + { + for (Object value : list) + { + Type type = encoding(value); + put(type.code); + write(type, value); + } + } + + public void writeArray(List<Object> array) + { + int pos = beginSize32(); + if (array != null) + { + writeArrayEntries(array); + } + endSize32(pos); + } + + protected void writeArrayEntries(List<Object> array) + { + Type type; + + if (array.isEmpty()) + { + return; + } + else + { + type = encoding(array.get(0)); + } + + put(type.code); + + writeUint32(array.size()); + + for (Object value : array) + { + write(type, value); + } + } + + private void writeSize(Type t, int size) + { + if (t.fixed) + { + if (size != t.width) + { + throw new IllegalArgumentException + ("size does not match fixed width " + t.width + ": " + + size); + } + } + else + { + writeSize(t.width, size); + } + } + + private void writeSize(int width, int size) + { + // XXX: should check lengths + switch (width) + { + case 1: + writeUint8((short) size); + break; + case 2: + writeUint16(size); + break; + case 4: + writeUint32(size); + break; + default: + throw new IllegalStateException("illegal width: " + width); + } + } + + private int beginSize(int width) + { + switch (width) + { + case 1: + return beginSize8(); + case 2: + return beginSize16(); + case 4: + return beginSize32(); + default: + throw new IllegalStateException("illegal width: " + width); + } + } + + private void endSize(int width, int pos) + { + switch (width) + { + case 1: + endSize8(pos); + break; + case 2: + endSize16(pos); + break; + case 4: + endSize32(pos); + break; + default: + throw new IllegalStateException("illegal width: " + width); + } + } + + private void writeBytes(Type t, byte[] bytes) + { + writeSize(t, bytes.length); + put(bytes); + } + + private <T> T coerce(Class<T> klass, Object value) + { + if (klass.isInstance(value)) + { + return klass.cast(value); + } + else + { + throw new IllegalArgumentException("" + value); + } + } + + private void write(Type t, Object value) + { + switch (t) + { + case BIN8: + case UINT8: + writeUint8(coerce(Short.class, value)); + break; + case INT8: + put(coerce(Byte.class, value)); + break; + case CHAR: + put((byte) ((char)coerce(Character.class, value))); + break; + case BOOLEAN: + if (coerce(Boolean.class, value)) + { + put((byte) 1); + } + else + { + put((byte) 0); + } + break; + + case BIN16: + case UINT16: + writeUint16(coerce(Integer.class, value)); + break; + + case INT16: + writeUint16(coerce(Short.class, value)); + break; + + case BIN32: + case UINT32: + writeUint32(coerce(Long.class, value)); + break; + + case CHAR_UTF32: + case INT32: + writeUint32(coerce(Integer.class, value)); + break; + + case FLOAT: + writeUint32(Float.floatToIntBits(coerce(Float.class, value))); + break; + + case BIN64: + case UINT64: + case INT64: + case DATETIME: + writeUint64(coerce(Long.class, value)); + break; + + case DOUBLE: + long bits = Double.doubleToLongBits(coerce(Double.class, value)); + writeUint64(bits); + break; + + case UUID: + writeUuid(coerce(UUID.class, value)); + break; + + case STR8: + writeStr8(coerce(String.class, value)); + break; + + case STR16: + writeStr16(coerce(String.class, value)); + break; + + case STR8_LATIN: + case STR8_UTF16: + case STR16_LATIN: + case STR16_UTF16: + // XXX: need to do character conversion + writeBytes(t, coerce(String.class, value).getBytes()); + break; + + case MAP: + writeMap((Map<String,Object>) coerce(Map.class, value)); + break; + case LIST: + writeList(coerce(List.class, value)); + break; + case ARRAY: + writeArray(coerce(List.class, value)); + break; + case STRUCT32: + writeStruct32(coerce(Struct.class, value)); + break; + + case BIN40: + case DEC32: + case BIN72: + case DEC64: + // XXX: what types are we supposed to use here? + writeBytes(t, coerce(byte[].class, value)); + break; + + case VOID: + break; + + default: + writeBytes(t, coerce(byte[].class, value)); + break; + } + } + +} |