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SnappyData store based off Pivotal GemFireXD
/*
* Copyright (c) 2010-2015 Pivotal Software, Inc. All rights reserved.
*
* Licensed 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. See accompanying
* LICENSE file.
*/
package com.gemstone.gemfire.pdx.internal;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Date;
import com.gemstone.gemfire.InternalGemFireException;
import com.gemstone.gemfire.internal.DSCODE;
import com.gemstone.gemfire.internal.InternalDataSerializer;
import com.gemstone.gemfire.internal.cache.GemFireCacheImpl;
import com.gemstone.gemfire.internal.i18n.LocalizedStrings;
import com.gemstone.gemfire.internal.tcp.ByteBufferInputStream;
import com.gemstone.gemfire.pdx.FieldType;
import com.gemstone.gemfire.pdx.PdxFieldTypeMismatchException;
import com.gemstone.gemfire.pdx.PdxInstance;
import com.gemstone.gemfire.pdx.PdxReader;
import com.gemstone.gemfire.pdx.PdxSerializable;
import com.gemstone.gemfire.pdx.PdxSerializationException;
import com.gemstone.gemfire.pdx.PdxSerializer;
import com.gemstone.gemfire.pdx.PdxUnreadFields;
import com.gemstone.gemfire.pdx.internal.AutoSerializableManager.AutoClassInfo;
import com.gemstone.gemfire.pdx.internal.AutoSerializableManager.PdxFieldWrapper;
/**
* A new instance of this class is created each time we deserialize a pdx.
* It is also used as the base class of our {@link PdxInstance} implementation.
* It is serializable because PdxInstance is.
*
* @since 6.6
* @see InternalDataSerializer#readPdxSerializable(java.io.DataInput)
*/
public class PdxReaderImpl implements InternalPdxReader, java.io.Serializable {
private static final long serialVersionUID = -6094553093860427759L;
/**
* This is the type the blob we are reading was encoded with.
*/
private final PdxType blobType;
private final PdxInputStream dis;
private transient PdxUnreadData readUnreadFieldsCalled;
protected PdxReaderImpl(PdxReaderImpl copy) {
this.blobType = copy.blobType;
this.dis = new PdxInputStream(copy.dis);
this.readUnreadFieldsCalled = copy.getReadUnreadFieldsCalled();
}
public PdxReaderImpl(PdxType pdxType, DataInput in, int len) throws IOException {
this(pdxType, createDis(in, len));
}
private static PdxInputStream createDis(DataInput in, int len) throws IOException {
boolean isBBIS = in instanceof ByteBufferInputStream;
PdxInputStream bbis;
if (isBBIS) {
// Note, it is ok for our immutable bbis to wrap a mutable bbis
// because PdxReaderImpl is only used for a quick deserialization.
// PdxInstanceImpl has its own flavor of createDis since it can
// live longer.
bbis = new PdxInputStream((ByteBufferInputStream) in, len);
int bytesSkipped = in.skipBytes(len);
int bytesRemaining = len - bytesSkipped;
while (bytesRemaining > 0) {
in.readByte();
bytesRemaining--;
}
} else {
byte[] bytes = new byte[len];
in.readFully(bytes);
bbis = new PdxInputStream(bytes);
}
return bbis;
}
protected PdxReaderImpl(PdxType pdxType, PdxInputStream bbis) {
this.blobType = pdxType;
this.dis = bbis;
}
public static final int MAX_UNSIGNED_BYTE = 255;
public static final int MAX_UNSIGNED_SHORT = 65535;
/**
* @return size of each variable length field offset
*/
private byte getSizeOfOffset() {
int size = this.dis.size();
if (size <= MAX_UNSIGNED_BYTE) {
return DataSize.BYTE_SIZE;
} else if (size <= MAX_UNSIGNED_SHORT) {
return DataSize.SHORT_SIZE;
}
return DataSize.INTEGER_SIZE;
}
public PdxField getPdxField(String fieldName) {
return this.blobType.getPdxField(fieldName);
}
public char readChar(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return 0;
}
if (ft.getFieldType() != FieldType.CHAR) {
throw new PdxFieldTypeMismatchException(
"Expected char field but found field of type " + ft.getTypeIdString());
}
return readChar(ft);
}
public char readChar(PdxField ft) {
return dis.readChar(getPositionForField(ft));
}
public char readChar() {
return dis.readChar();
}
public boolean readBoolean(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return false;
}
if (ft.getFieldType() != FieldType.BOOLEAN) {
throw new PdxFieldTypeMismatchException(
"Expected boolean field but found field of type "
+ ft.getTypeIdString());
}
return readBoolean(ft);
}
public boolean readBoolean(PdxField ft) {
return dis.readBoolean(getPositionForField(ft));
}
public boolean readBoolean() {
return dis.readBoolean();
}
public byte readByte(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return 0;
}
if (ft.getFieldType() != FieldType.BYTE) {
throw new PdxFieldTypeMismatchException(
"Expected byte field but found field of type " + ft.getTypeIdString());
}
return readByte(ft);
}
public byte readByte(PdxField ft) {
return dis.readByte(getPositionForField(ft));
}
public byte readByte() {
return dis.readByte();
}
public short readShort(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return 0;
}
if (ft.getFieldType() != FieldType.SHORT) {
throw new PdxFieldTypeMismatchException(
"Expected short field but found field of type "
+ ft.getTypeIdString());
}
return readShort(ft);
}
public short readShort(PdxField ft) {
return dis.readShort(getPositionForField(ft));
}
public short readShort() {
return dis.readShort();
}
public int readInt(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return 0;
}
if (ft.getFieldType() != FieldType.INT) {
throw new PdxFieldTypeMismatchException(
"Expected int field but found field of type " + ft.getTypeIdString());
}
return readInt(ft);
}
public int readInt(PdxField ft) {
return dis.readInt(getPositionForField(ft));
}
public int readInt() {
return dis.readInt();
}
public long readLong(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return 0;
}
if (ft.getFieldType() != FieldType.LONG) {
throw new PdxFieldTypeMismatchException(
"Expected long field but found field of type " + ft.getTypeIdString());
}
return readLong(ft);
}
public long readLong(PdxField ft) {
return dis.readLong(getPositionForField(ft));
}
public long readLong() {
return dis.readLong();
}
public float readFloat(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return 0;
}
if (ft.getFieldType() != FieldType.FLOAT) {
throw new PdxFieldTypeMismatchException(
"Expected float field but found field of type "
+ ft.getTypeIdString());
}
return readFloat(ft);
}
public float readFloat(PdxField ft) {
return dis.readFloat(getPositionForField(ft));
}
public float readFloat() {
return dis.readFloat();
}
public double readDouble(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return 0;
}
if (ft.getFieldType() != FieldType.DOUBLE) {
throw new PdxFieldTypeMismatchException(
"Expected double field but found field of type "
+ ft.getTypeIdString());
}
return readDouble(ft);
}
public double readDouble(PdxField ft) {
return dis.readDouble(getPositionForField(ft));
}
public double readDouble() {
return dis.readDouble();
}
public Date readDate(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return null;
}
if (ft.getFieldType() != FieldType.DATE) {
throw new PdxFieldTypeMismatchException(
"Expected Date field but found field of type " + ft.getTypeIdString());
}
return readDate(ft);
}
public Date readDate(PdxField ft) {
return this.dis.readDate(getPositionForField(ft));
}
public Date readDate() {
return this.dis.readDate();
}
public String readString(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return null;
}
if (ft.getFieldType() != FieldType.STRING) {
throw new PdxFieldTypeMismatchException(
"Expected String field but found field of type "
+ ft.getTypeIdString());
}
return readString(ft);
}
public String readString(PdxField ft) {
return this.dis.readString(getPositionForField(ft));
}
public String readString() {
return this.dis.readString();
}
public Object readObject(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return null;
}
if (ft.getFieldType() != FieldType.OBJECT) {
throw new PdxFieldTypeMismatchException(
"Expected Object field but found field of type "
+ ft.getTypeIdString());
}
return readObject(ft);
}
public Object readObject(PdxField ft) {
if (ft instanceof DefaultPdxField) {
return null; // default object value
}
return this.dis.readObject(getPositionForField(ft));
}
public Object readObject() {
return this.dis.readObject();
}
public char[] readCharArray(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return null;
}
if (ft.getFieldType() != FieldType.CHAR_ARRAY) {
throw new PdxFieldTypeMismatchException(
"Expected char[] field but found field of type "
+ ft.getTypeIdString());
}
return readCharArray(ft);
}
public char[] readCharArray(PdxField ft) {
return this.dis.readCharArray(getPositionForField(ft));
}
public char[] readCharArray() {
return this.dis.readCharArray();
}
public boolean[] readBooleanArray(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return null;
}
if (ft.getFieldType() != FieldType.BOOLEAN_ARRAY) {
throw new PdxFieldTypeMismatchException(
"Expected boolean[] field but found field of type "
+ ft.getTypeIdString());
}
return readBooleanArray(ft);
}
public boolean[] readBooleanArray(PdxField ft) {
return this.dis.readBooleanArray(getPositionForField(ft));
}
public boolean[] readBooleanArray() {
return this.dis.readBooleanArray();
}
public byte[] readByteArray(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return null;
}
if (ft.getFieldType() != FieldType.BYTE_ARRAY) {
throw new PdxFieldTypeMismatchException(
"Expected byte[] field but found field of type "
+ ft.getTypeIdString());
}
return readByteArray(ft);
}
public byte[] readByteArray(PdxField ft) {
return this.dis.readByteArray(getPositionForField(ft));
}
public byte[] readByteArray() {
return this.dis.readByteArray();
}
public short[] readShortArray(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return null;
}
if (ft.getFieldType() != FieldType.SHORT_ARRAY) {
throw new PdxFieldTypeMismatchException(
"Expected short[] field but found field of type "
+ ft.getTypeIdString());
}
return readShortArray(ft);
}
public short[] readShortArray(PdxField ft) {
return this.dis.readShortArray(getPositionForField(ft));
}
public short[] readShortArray() {
return this.dis.readShortArray();
}
public int[] readIntArray(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return null;
}
if (ft.getFieldType() != FieldType.INT_ARRAY) {
throw new PdxFieldTypeMismatchException(
"Expected int[] field but found field of type "
+ ft.getTypeIdString());
}
return readIntArray(ft);
}
public int[] readIntArray(PdxField ft) {
return this.dis.readIntArray(getPositionForField(ft));
}
public int[] readIntArray() {
return this.dis.readIntArray();
}
public long[] readLongArray(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return null;
}
if (ft.getFieldType() != FieldType.LONG_ARRAY) {
throw new PdxFieldTypeMismatchException(
"Expected long[] field but found field of type "
+ ft.getTypeIdString());
}
return readLongArray(ft);
}
public long[] readLongArray(PdxField ft) {
return this.dis.readLongArray(getPositionForField(ft));
}
public long[] readLongArray() {
return this.dis.readLongArray();
}
public float[] readFloatArray(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return null;
}
if (ft.getFieldType() != FieldType.FLOAT_ARRAY) {
throw new PdxFieldTypeMismatchException(
"Expected float[] field but found field of type "
+ ft.getTypeIdString());
}
return readFloatArray(ft);
}
public float[] readFloatArray(PdxField ft) {
return this.dis.readFloatArray(getPositionForField(ft));
}
public float[] readFloatArray() {
return this.dis.readFloatArray();
}
public double[] readDoubleArray(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return null;
}
if (ft.getFieldType() != FieldType.DOUBLE_ARRAY) {
throw new PdxFieldTypeMismatchException(
"Expected double[] field but found field of type "
+ ft.getTypeIdString());
}
return readDoubleArray(ft);
}
public double[] readDoubleArray(PdxField ft) {
return this.dis.readDoubleArray(getPositionForField(ft));
}
public double[] readDoubleArray() {
return this.dis.readDoubleArray();
}
public String[] readStringArray(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return null;
}
if (ft.getFieldType() != FieldType.STRING_ARRAY) {
throw new PdxFieldTypeMismatchException(
"Expected String[] field but found field of type "
+ ft.getTypeIdString());
}
return readStringArray(ft);
}
public String[] readStringArray(PdxField ft) {
return this.dis.readStringArray(getPositionForField(ft));
}
public String[] readStringArray() {
return this.dis.readStringArray();
}
public Object[] readObjectArray(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return null;
}
if (ft.getFieldType() != FieldType.OBJECT_ARRAY) {
throw new PdxFieldTypeMismatchException(
"Expected Object[] field but found field of type "
+ ft.getTypeIdString());
}
return readObjectArray(ft);
}
public Object[] readObjectArray(PdxField ft) {
if (ft instanceof DefaultPdxField) {
return null; // default array value
}
return this.dis.readObjectArray(getPositionForField(ft));
}
public Object[] readObjectArray() {
return this.dis.readObjectArray();
}
public byte[][] readArrayOfByteArrays(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return null;
}
if (ft.getFieldType() != FieldType.ARRAY_OF_BYTE_ARRAYS) {
throw new PdxFieldTypeMismatchException(
"Expected byte[][] field but found field of type "
+ ft.getTypeIdString());
}
return readArrayOfByteArrays(ft);
}
public byte[][] readArrayOfByteArrays(PdxField ft) {
return this.dis.readArrayOfByteArrays(getPositionForField(ft));
}
public byte[][] readArrayOfByteArrays() {
return this.dis.readArrayOfByteArrays();
}
/**
*
* @param idx
* of the variable length field
* @return the offset to the variable length field
*/
private int getOffset(int idx) {
int size = this.dis.size();
if (size <= MAX_UNSIGNED_BYTE) {
return dis.readByte(size - idx * DataSize.BYTE_SIZE) & MAX_UNSIGNED_BYTE;
} else if (size <= MAX_UNSIGNED_SHORT) {
return dis.readShort(size - idx * DataSize.SHORT_SIZE)
& MAX_UNSIGNED_SHORT;
} else {
return dis.readInt(size - idx * DataSize.INTEGER_SIZE);
}
}
private int getPositionForField(PdxField ft) {
return getAbsolutePosition(ft);
}
private int getAbsolutePosition(PdxField ft) {
int pos = 0;
int idx0 = ft.getRelativeOffset();
int idx1 = ft.getVlfOffsetIndex();
if (ft.isVariableLengthType()) {
if (idx1 != -1) {
pos = getOffset(idx1);
} else {
pos = idx0;
}
} else {
if (idx0 >= 0) {
// index0 indicates the offset
pos = idx0;
} else if (idx1 > 0) {
// index1 indicates the offset no. Read the value at that offset
// then move backward index0 positions backward from that value.
pos = getOffset(idx1) + idx0;
} else if (idx1 == -1) {
// index0 indicates no position backward from last offset position
pos = getOffsetToVlfTable() + idx0;
} else {
throw new InternalGemFireException("idx0=" + idx0 + " idx1=" + idx1);
}
}
return pos;
}
private int getOffsetToVlfTable() {
return this.dis.size()
- blobType.getVariableLengthFieldCount()
* getSizeOfOffset();
}
public boolean hasField(String fieldName) {
return blobType.getPdxField(fieldName) != null;
}
public boolean isIdentityField(String fieldName) {
PdxField field = blobType.getPdxField(fieldName);
return field != null && field.isIdentityField();
}
public Object readField(String fieldName) {
PdxField ft = blobType.getPdxField(fieldName);
if (ft == null) {
return null;
}
switch (ft.getFieldType()) {
case CHAR:
return readChar(ft);
case BOOLEAN:
return readBoolean(ft);
case BYTE:
return readByte(ft);
case SHORT:
return readShort(ft);
case INT:
return readInt(ft);
case LONG:
return readLong(ft);
case FLOAT:
return readFloat(ft);
case DOUBLE:
return readDouble(ft);
case DATE:
return readDate(ft);
case STRING:
return readString(ft);
case OBJECT:
return readObject(ft);
case BOOLEAN_ARRAY:
return readBooleanArray(ft);
case CHAR_ARRAY:
return readCharArray(ft);
case BYTE_ARRAY:
return readByteArray(ft);
case SHORT_ARRAY:
return readShortArray(ft);
case INT_ARRAY:
return readIntArray(ft);
case LONG_ARRAY:
return readLongArray(ft);
case FLOAT_ARRAY:
return readFloatArray(ft);
case DOUBLE_ARRAY:
return readDoubleArray(ft);
case STRING_ARRAY:
return readStringArray(ft);
case OBJECT_ARRAY:
return readObjectArray(ft);
case ARRAY_OF_BYTE_ARRAYS:
return readArrayOfByteArrays(ft);
default:
throw new InternalGemFireException("Unhandled field type " + ft.getFieldType());
}
}
public static boolean TESTHOOK_TRACKREADS = false;
public Object getObject() throws IOException, ClassNotFoundException {
return basicGetObject();
}
protected Object basicGetObject() {
String pdxClassName = getPdxType().getClassName();
Class pdxClass = getPdxType().getPdxClass();
{
AutoClassInfo ci = getPdxType().getAutoInfo(pdxClass);
if (ci != null) {
Object obj = ci.newInstance(pdxClass);
this.orderedDeserialize(obj, ci);
return obj;
}
}
PdxReader pdxReader = this;
// only create a tracking one if we might need it
UnreadPdxType unreadLocalPdxType = null;
boolean needToTrackReads = TESTHOOK_TRACKREADS;
GemFireCacheImpl gfc = GemFireCacheImpl.getForPdx("PDX registry is unavailable because the Cache has been closed.");
TypeRegistry tr = gfc.getPdxRegistry();
if (!gfc.getPdxIgnoreUnreadFields()) {
PdxType localPdxType = tr.getExistingTypeForClass(pdxClass);
if (localPdxType != null) {
if (getPdxType().getTypeId() != localPdxType.getTypeId()) {
if (getPdxType().hasExtraFields(localPdxType)) {
// TODO: we can calculate the extra fields here
needToTrackReads = true;
}
} else {
// TODO they are the same type id so create an optimized PdxReaderImpl
}
} else {
// we don't know what our local type would be
needToTrackReads = true;
}
}
if (needToTrackReads) {
unreadLocalPdxType = tr.getExistingTypeForClass(pdxClass, getPdxType().getTypeId());
if (unreadLocalPdxType != null) {
needToTrackReads = false;
} else {
pdxReader = new TrackingPdxReaderImpl(this, tr, pdxClass);
}
}
Object result;
if (PdxSerializable.class.isAssignableFrom(pdxClass)) {
try {
result = pdxClass.newInstance();
} catch (Exception e) {
PdxSerializationException ex = new PdxSerializationException(
LocalizedStrings.DataSerializer_COULD_NOT_CREATE_AN_INSTANCE_OF_A_CLASS_0
.toLocalizedString(pdxClassName), e);
throw ex;
}
((PdxSerializable)result).fromData(pdxReader);
} else {
PdxSerializer pdxSerializer = gfc.getPdxSerializer();
if (pdxSerializer != null) {
result = pdxSerializer.fromData(pdxClass, pdxReader);
if (result == null) {
throw new PdxSerializationException("Could not deserialize pdx because the pdx serializer's fromData returned false for a pdx of class " + pdxClassName);
}
} else {
throw new PdxSerializationException("Could not deserialize pdx because a PdxSerializer does not exist.");
}
}
{
PdxUnreadData ud = getReadUnreadFieldsCalled();
if (ud != null) {
// User called PdxReader.readUnreadFields()
if (unreadLocalPdxType != null) {
if (unreadLocalPdxType.getUnreadFieldIndexes() != null) {
ud.initialize(unreadLocalPdxType, this);
}
} else if (needToTrackReads) {
((TrackingPdxReaderImpl)pdxReader).internalReadUnreadFields(ud);
}
} else {
if (needToTrackReads) {
ud = ((TrackingPdxReaderImpl)pdxReader).internalReadUnreadFields(new PdxUnreadData());
if (ud != null && !ud.isEmpty()) {
tr.putUnreadData(result, ud);
}
} else if (unreadLocalPdxType != null) {
if (unreadLocalPdxType.getUnreadFieldIndexes() != null) {
tr.putUnreadData(result, new PdxUnreadData(unreadLocalPdxType, this));
}
}
}
}
return result;
}
PdxUnreadData getReadUnreadFieldsCalled() {
return this.readUnreadFieldsCalled;
}
void setReadUnreadFieldsCalled(PdxUnreadData v) {
this.readUnreadFieldsCalled = v;
}
public PdxType getPdxType() {
return this.blobType;
}
public ByteBuffer getRaw(int fieldIdx) {
PdxField ft = getPdxType().getPdxFieldByIndex(fieldIdx);
if (ft == null) {
throw new InternalGemFireException("unknown field " + fieldIdx);
}
return getRaw(ft);
}
protected ByteBuffer getRaw(PdxField ft) {
if (ft instanceof DefaultPdxField) {
return ((DefaultPdxField)ft).getDefaultBytes();
}
int startOffset = getAbsolutePosition(ft);
int nextFieldIdx = ft.getFieldIndex()+1;
int endOffset;
if (nextFieldIdx >= getPdxType().getFieldCount()) {
endOffset = getOffsetToVlfTable();
} else {
endOffset = getAbsolutePosition(getPdxType().getPdxFieldByIndex(nextFieldIdx));
}
return this.dis.slice(startOffset, endOffset);
}
public PdxUnreadFields readUnreadFields() {
PdxUnreadData result = new PdxUnreadData();
setReadUnreadFieldsCalled(result);
return result;
}
protected void basicSendTo(DataOutput out) throws IOException {
this.dis.sendTo(out);
}
protected void basicSendTo(ByteBuffer bb) {
this.dis.sendTo(bb);
}
protected int basicSize() {
return this.dis.size();
}
protected void basicSetBuffer(ByteBuffer bb) {
this.dis.setBuffer(bb);
}
/**
* Provides optimized deserialization when a blob exactly matches
* the fields of the target class when using {@link AutoSerializableManager}.
* @param obj the target object we are deserializing into
* @param ci the meta information generated by the auto serializer
*/
public void orderedDeserialize(Object obj, AutoClassInfo ci) {
PdxReaderImpl reader = prepForOrderedReading();
for (PdxFieldWrapper f: ci.getFields()) {
//System.out.println("DEBUG reading field=" + f.getField().getName() + " offset=" + reader.dis.position());
f.orderedDeserialize(reader, obj);
}
}
/**
* Return a reader that can do ordered reading.
*/
private PdxReaderImpl prepForOrderedReading() {
PdxReaderImpl result = this;
if (this.dis instanceof PdxInstanceInputStream) {
result = new PdxReaderImpl(this);
}
int pos = 0;
if (result.blobType.getFieldCount() > 0) {
pos = getPositionForField(result.blobType.getFields().get(0));
}
result.dis.position(pos);
return result;
}
/**
*
* @param field
* @return PdxString if field is a String otherwise invokes {@link #readField(String)}
*/
public Object readRawField(String field){
PdxField ft = blobType.getPdxField(field);
if (ft == null) {
return null;
}
if (ft.getFieldType() == FieldType.STRING) {
return readPdxString(ft);
}
else{
return readField(field);
}
}
/**
*
* @param ft
* @return returns {@link PdxString}
*/
public PdxString readPdxString(PdxField ft){
ByteBuffer buffer = dis.getBuffer();
byte[] bytes = null;
if(buffer.hasArray()){
bytes = buffer.array();
}
else{
throw new IllegalStateException();
}
int offset = getPositionForField(ft) + buffer.arrayOffset();
// Do not create PdxString if the field is NULL
if(bytes[offset] == DSCODE.NULL || bytes[offset] == DSCODE.NULL_STRING){
return null;
}
return new PdxString(bytes, offset);
}
}