Source Code Cross Referenced for Token.java in  » XML » xstream-1.3 » com » thoughtworks » xstream » io » binary » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » XML » xstream 1.3 » com.thoughtworks.xstream.io.binary 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright (C) 2006 Joe Walnes.
003:         * Copyright (C) 2006, 2007 XStream Committers.
004:         * All rights reserved.
005:         *
006:         * The software in this package is published under the terms of the BSD
007:         * style license a copy of which has been included with this distribution in
008:         * the LICENSE.txt file.
009:         * 
010:         * Created on 04. June 2006 by Joe Walnes
011:         */
012:        package com.thoughtworks.xstream.io.binary;
013:
014:        import com.thoughtworks.xstream.io.StreamException;
015:
016:        import java.io.DataOutput;
017:        import java.io.IOException;
018:        import java.io.DataInput;
019:
020:        /**
021:         * Represents the Tokens stored in the binary stream used by
022:         * {@link BinaryStreamReader} and {@link BinaryStreamWriter}.
023:         * <p/>
024:         * <p>A token consists of a type and (depending on this type)
025:         * it may additionally have an ID (positive long number)
026:         * and/or a value (String).</p>
027:         * <p/>
028:         * <p>The first byte of the token represents how many subsequent
029:         * bytes are used by the ID.
030:         *
031:         * @author Joe Walnes
032:         * @see BinaryStreamReader
033:         * @see BinaryStreamWriter
034:         * @since 1.2
035:         */
036:        public abstract class Token {
037:
038:            private static final byte TYPE_MASK = 0x7;
039:            public static final byte TYPE_VERSION = 0x1;
040:            public static final byte TYPE_MAP_ID_TO_VALUE = 0x2;
041:            public static final byte TYPE_START_NODE = 0x3;
042:            public static final byte TYPE_END_NODE = 0x4;
043:            public static final byte TYPE_ATTRIBUTE = 0x5;
044:            public static final byte TYPE_VALUE = 0x6;
045:
046:            private static final byte ID_MASK = 0x38;
047:            private static final byte ID_ONE_BYTE = 0x08;
048:            private static final byte ID_TWO_BYTES = 0x10;
049:            private static final byte ID_FOUR_BYTES = 0x18;
050:            private static final byte ID_EIGHT_BYTES = 0x20;
051:
052:            private final byte type;
053:
054:            protected long id = -1;
055:            protected String value;
056:
057:            public Token(byte type) {
058:                this .type = type;
059:            }
060:
061:            public byte getType() {
062:                return type;
063:            }
064:
065:            public long getId() {
066:                return id;
067:            }
068:
069:            public String getValue() {
070:                return value;
071:            }
072:
073:            public String toString() {
074:                return getClass().getName() + " [id=" + id + ", value='"
075:                        + value + "']";
076:            }
077:
078:            public boolean equals(Object o) {
079:                if (this  == o)
080:                    return true;
081:                if (o == null || getClass() != o.getClass())
082:                    return false;
083:
084:                final Token token = (Token) o;
085:
086:                if (id != token.id)
087:                    return false;
088:                if (type != token.type)
089:                    return false;
090:                return !(value != null ? !value.equals(token.value)
091:                        : token.value != null);
092:
093:            }
094:
095:            public int hashCode() {
096:                int result;
097:                result = type;
098:                result = 29 * result + (int) (id ^ (id >>> 32));
099:                result = 29 * result + (value != null ? value.hashCode() : 0);
100:                return result;
101:            }
102:
103:            public abstract void writeTo(DataOutput out, byte idType)
104:                    throws IOException;
105:
106:            public abstract void readFrom(DataInput in, byte idType)
107:                    throws IOException;
108:
109:            protected void writeId(DataOutput out, long id, byte idType)
110:                    throws IOException {
111:                if (id < 0) {
112:                    throw new IOException("id must not be negative " + id);
113:                }
114:                switch (idType) {
115:                case ID_ONE_BYTE:
116:                    out.writeByte((byte) id + Byte.MIN_VALUE);
117:                    break;
118:                case ID_TWO_BYTES:
119:                    out.writeShort((short) id + Short.MIN_VALUE);
120:                    break;
121:                case ID_FOUR_BYTES:
122:                    out.writeInt((int) id + Integer.MIN_VALUE);
123:                    break;
124:                case ID_EIGHT_BYTES:
125:                    out.writeLong(id + Long.MIN_VALUE);
126:                    break;
127:                default:
128:                    throw new Error("Unknown idType " + idType);
129:                }
130:            }
131:
132:            protected void writeString(DataOutput out, String string)
133:                    throws IOException {
134:                out.writeUTF(string);
135:            }
136:
137:            protected long readId(DataInput in, byte idType) throws IOException {
138:                switch (idType) {
139:                case ID_ONE_BYTE:
140:                    return in.readByte() - Byte.MIN_VALUE;
141:                case ID_TWO_BYTES:
142:                    return in.readShort() - Short.MIN_VALUE;
143:                case ID_FOUR_BYTES:
144:                    return in.readInt() - Integer.MIN_VALUE;
145:                case ID_EIGHT_BYTES:
146:                    return in.readLong() - Long.MIN_VALUE;
147:                default:
148:                    throw new Error("Unknown idType " + idType);
149:                }
150:            }
151:
152:            protected String readString(DataInput in) throws IOException {
153:                return in.readUTF();
154:            }
155:
156:            public static class Formatter {
157:
158:                public void write(DataOutput out, Token token)
159:                        throws IOException {
160:                    long id = token.getId();
161:                    byte idType;
162:                    if (id <= Byte.MAX_VALUE - Byte.MIN_VALUE) {
163:                        idType = ID_ONE_BYTE;
164:                    } else if (id <= Short.MAX_VALUE - Short.MIN_VALUE) {
165:                        idType = ID_TWO_BYTES;
166:                    } else if (id <= (long) Integer.MAX_VALUE
167:                            - (long) Integer.MIN_VALUE) { // cast to long to prevent overflo
168:                        idType = ID_FOUR_BYTES;
169:                    } else {
170:                        idType = ID_EIGHT_BYTES;
171:                    }
172:                    out.write(token.getType() + idType);
173:                    token.writeTo(out, idType);
174:                }
175:
176:                public Token read(DataInput in) throws IOException {
177:                    byte nextByte = in.readByte();
178:                    byte type = (byte) (nextByte & TYPE_MASK);
179:                    byte idType = (byte) (nextByte & ID_MASK);
180:                    Token token = contructToken(type);
181:                    token.readFrom(in, idType);
182:                    return token;
183:                }
184:
185:                private Token contructToken(byte type) {
186:                    switch (type) {
187:                    case Token.TYPE_START_NODE:
188:                        return new StartNode();
189:                    case Token.TYPE_MAP_ID_TO_VALUE:
190:                        return new MapIdToValue();
191:                    case Token.TYPE_ATTRIBUTE:
192:                        return new Attribute();
193:                    case Token.TYPE_END_NODE:
194:                        return new EndNode();
195:                    case Token.TYPE_VALUE:
196:                        return new Value();
197:                    default:
198:                        throw new StreamException("Unknown token type");
199:                    }
200:                }
201:            }
202:
203:            public static class MapIdToValue extends Token {
204:
205:                public MapIdToValue(long id, String value) {
206:                    super (TYPE_MAP_ID_TO_VALUE);
207:                    this .id = id;
208:                    this .value = value;
209:                }
210:
211:                public MapIdToValue() {
212:                    super (TYPE_MAP_ID_TO_VALUE);
213:                }
214:
215:                public void writeTo(DataOutput out, byte idType)
216:                        throws IOException {
217:                    writeId(out, id, idType);
218:                    writeString(out, value);
219:                }
220:
221:                public void readFrom(DataInput in, byte idType)
222:                        throws IOException {
223:                    id = readId(in, idType);
224:                    value = readString(in);
225:                }
226:
227:            }
228:
229:            public static class StartNode extends Token {
230:
231:                public StartNode(long id) {
232:                    super (TYPE_START_NODE);
233:                    this .id = id;
234:                }
235:
236:                public StartNode() {
237:                    super (TYPE_START_NODE);
238:                }
239:
240:                public void writeTo(DataOutput out, byte idType)
241:                        throws IOException {
242:                    writeId(out, id, idType);
243:                }
244:
245:                public void readFrom(DataInput in, byte idType)
246:                        throws IOException {
247:                    id = readId(in, idType);
248:                }
249:
250:            }
251:
252:            public static class EndNode extends Token {
253:
254:                public EndNode() {
255:                    super (TYPE_END_NODE);
256:                }
257:
258:                public void writeTo(DataOutput out, byte idType) {
259:                }
260:
261:                public void readFrom(DataInput in, byte idType) {
262:                }
263:
264:            }
265:
266:            public static class Attribute extends Token {
267:
268:                public Attribute(long id, String value) {
269:                    super (TYPE_ATTRIBUTE);
270:                    this .id = id;
271:                    this .value = value;
272:                }
273:
274:                public Attribute() {
275:                    super (TYPE_ATTRIBUTE);
276:                }
277:
278:                public void writeTo(DataOutput out, byte idType)
279:                        throws IOException {
280:                    writeId(out, id, idType);
281:                    writeString(out, value);
282:                }
283:
284:                public void readFrom(DataInput in, byte idType)
285:                        throws IOException {
286:                    this .id = readId(in, idType);
287:                    this .value = readString(in);
288:                }
289:
290:            }
291:
292:            public static class Value extends Token {
293:
294:                public Value(String value) {
295:                    super (TYPE_VALUE);
296:                    this .value = value;
297:                }
298:
299:                public Value() {
300:                    super (TYPE_VALUE);
301:                }
302:
303:                public void writeTo(DataOutput out, byte idType)
304:                        throws IOException {
305:                    writeString(out, value);
306:                }
307:
308:                public void readFrom(DataInput in, byte idType)
309:                        throws IOException {
310:                    value = readString(in);
311:                }
312:
313:            }
314:
315:        }
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