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package org.netbeans.lib.profiler.heap;
import java.io.IOException;
import java.util.Date;
import java.util.ResourceBundle;
/**
*
* @author Tomas Hurka
*/
public abstract class HprofByteBuffer {
//~ Static fields/initializers -----------------------------------------------------------------------------------------------
// Magic header
static final String magic1 = "JAVA PROFILE 1.0.1"; // NOI18N
static final String magic2 = "JAVA PROFILE 1.0.2"; // NOI18N
static final int JAVA_PROFILE_1_0_1 = 1;
static final int JAVA_PROFILE_1_0_2 = 2;
static final int MINIMAL_SIZE = 30;
static final boolean DEBUG = false;
//~ Instance fields ----------------------------------------------------------------------------------------------------------
int idSize;
int version;
long headerSize;
long length;
long time;
//~ Methods ------------------------------------------------------------------------------------------------------------------
abstract char getChar(long index);
abstract double getDouble(long index);
abstract float getFloat(long index);
long getHeaderSize() {
return headerSize;
}
long getID(long offset) {
if (idSize == 4) {
return ((long)getInt(offset)) & 0xFFFFFFFFL;
} else if (idSize == 8) {
return getLong(offset);
}
assert false;
return -1;
}
int getIDSize() {
return idSize;
}
int getFoffsetSize() {
return length<Integer.MAX_VALUE ? 4 : 8;
}
abstract int getInt(long index);
abstract long getLong(long index);
abstract short getShort(long index);
long getTime() {
return time;
}
long capacity() {
return length;
}
abstract byte get(long index);
abstract void get(long position, byte[] chars);
void readHeader() throws IOException {
long[] offset = new long[1];
String magic = readStringNull(offset, MINIMAL_SIZE);
if (DEBUG) {
System.out.println("Magic " + magic); // NOI18N
}
if (magic1.equals(magic)) {
version = JAVA_PROFILE_1_0_1;
} else if (magic2.equals(magic)) {
version = JAVA_PROFILE_1_0_2;
} else {
if (DEBUG) {
System.out.println("Invalid version"); // NOI18N
}
String errText = ResourceBundle.getBundle("org/netbeans/lib/profiler/heap/Bundle")
.getString("HprofByteBuffer_InvalidFormat");
throw new IOException(errText);
}
idSize = getInt(offset[0]);
offset[0] += 4;
time = getLong(offset[0]);
offset[0] += 8;
if (DEBUG) {
System.out.println("ID " + idSize); // NOI18N
}
if (DEBUG) {
System.out.println("Date " + new Date(time).toString()); // NOI18N
}
headerSize = offset[0];
}
private String readStringNull(long[] offset, int len) {
StringBuilder s = new StringBuilder(20);
byte b = get(offset[0]++);
for (; (b > 0) && (s.length() < len); b = get(offset[0]++)) {
s.append((char) b);
}
return s.toString();
}
}