001
014
015 package com.liferay.portal.kernel.io;
016
017 import com.liferay.portal.kernel.util.CharBufferPool;
018 import com.liferay.portal.kernel.util.ClassLoaderObjectInputStream;
019 import com.liferay.portal.kernel.util.ClassLoaderPool;
020
021 import java.io.IOException;
022 import java.io.InputStream;
023 import java.io.ObjectInputStream;
024 import java.io.Serializable;
025
026 import java.nio.ByteBuffer;
027
028
035 public class Deserializer {
036
037 public Deserializer(ByteBuffer byteBuffer) {
038 buffer = byteBuffer.array();
039 index = byteBuffer.arrayOffset();
040 limit = index + byteBuffer.remaining();
041 }
042
043 public boolean readBoolean() {
044 detectBufferUnderflow(1);
045
046 return BigEndianCodec.getBoolean(buffer, index++);
047 }
048
049 public byte readByte() {
050 detectBufferUnderflow(1);
051
052 return buffer[index++];
053 }
054
055 public char readChar() {
056 detectBufferUnderflow(2);
057
058 char c = BigEndianCodec.getChar(buffer, index);
059
060 index += 2;
061
062 return c;
063 }
064
065 public double readDouble() {
066 detectBufferUnderflow(8);
067
068 double d = BigEndianCodec.getDouble(buffer, index);
069
070 index += 8;
071
072 return d;
073 }
074
075 public float readFloat() {
076 detectBufferUnderflow(4);
077
078 float f = BigEndianCodec.getFloat(buffer, index);
079
080 index += 4;
081
082 return f;
083 }
084
085 public int readInt() {
086 detectBufferUnderflow(4);
087
088 int i = BigEndianCodec.getInt(buffer, index);
089
090 index += 4;
091
092 return i;
093 }
094
095 public long readLong() {
096 detectBufferUnderflow(8);
097
098 long l = BigEndianCodec.getLong(buffer, index);
099
100 index += 8;
101
102 return l;
103 }
104
105 public <T extends Serializable> T readObject()
106 throws ClassNotFoundException {
107
108 byte tcByte = buffer[index++];
109
110 switch (tcByte) {
111 case SerializationConstants.TC_BOOLEAN:
112 return (T)Boolean.valueOf(readBoolean());
113
114 case SerializationConstants.TC_BYTE:
115 return (T)Byte.valueOf(readByte());
116
117 case SerializationConstants.TC_CHARACTER:
118 return (T)Character.valueOf(readChar());
119
120 case SerializationConstants.TC_DOUBLE:
121 return (T)Double.valueOf(readDouble());
122
123 case SerializationConstants.TC_FLOAT:
124 return (T)Float.valueOf(readFloat());
125
126 case SerializationConstants.TC_INTEGER:
127 return (T)Integer.valueOf(readInt());
128
129 case SerializationConstants.TC_LONG:
130 return (T)Long.valueOf(readLong());
131
132 case SerializationConstants.TC_NULL:
133 return null;
134
135 case SerializationConstants.TC_SHORT:
136 return (T)Short.valueOf(readShort());
137
138 case SerializationConstants.TC_STRING:
139 return (T)readString();
140
141 case SerializationConstants.TC_CONTEXT_NAME:
142 String contextName = readString();
143
144 ClassLoader classLoader = ClassLoaderPool.getClassLoader(
145 contextName);
146
147 try {
148 ObjectInputStream objectInpputStream =
149 new ClassLoaderObjectInputStream(
150 new BufferInputStream(), classLoader);
151
152 T t = (T)objectInpputStream.readObject();
153
154 objectInpputStream.close();
155
156 return t;
157 }
158 catch (IOException ioe) {
159 throw new RuntimeException(ioe);
160 }
161
162 default :
163 throw new IllegalStateException("Unkown TC code " + tcByte);
164 }
165 }
166
167 public short readShort() {
168 detectBufferUnderflow(2);
169
170 short s = BigEndianCodec.getShort(buffer, index);
171
172 index += 2;
173
174 return s;
175 }
176
177 public String readString() {
178 detectBufferUnderflow(5);
179
180 boolean asciiCode = BigEndianCodec.getBoolean(buffer, index++);
181
182 int length = BigEndianCodec.getInt(buffer, index);
183
184 index += 4;
185
186 if (asciiCode) {
187 detectBufferUnderflow(length);
188
189 char[] chars = CharBufferPool.borrow(length);
190
191 for (int i = 0; i < length; i++) {
192 chars[i] = (char)buffer[index++];
193 }
194
195 return new String(chars, 0, length);
196 }
197 else {
198 detectBufferUnderflow(length * 2);
199
200 char[] chars = CharBufferPool.borrow(length);
201
202 for (int i = 0; i < length; i++) {
203 chars[i] = BigEndianCodec.getChar(buffer, index);
204
205 index += 2;
206 }
207
208 return new String(chars, 0, length);
209 }
210 }
211
212
220 protected final void detectBufferUnderflow(int availableBytes) {
221 if ((index + availableBytes) > limit) {
222 throw new IllegalStateException("Buffer underflow");
223 }
224 }
225
226 protected byte[] buffer;
227 protected int index;
228 protected int limit;
229
230 protected class BufferInputStream extends InputStream {
231
232 @Override
233 public int read() {
234 return buffer[index++];
235 }
236
237 @Override
238 public int read(byte[] bytes) {
239 return read(bytes, 0, bytes.length);
240 }
241
242 @Override
243 public int read(byte[] bytes, int offset, int length) {
244 int remain = limit - index;
245
246 if (remain < length) {
247 length = remain;
248 }
249
250 System.arraycopy(buffer, index, bytes, offset, length);
251
252 index += length;
253
254 return length;
255 }
256
257 }
258
259 }