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Common library for HPCC functionality
/*******************************************************************************
* HPCC SYSTEMS software Copyright (C) 2018 HPCC Systems®.
*
* 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.
*******************************************************************************/
package org.hpccsystems.commons.ecl;
import java.io.Serializable;
import java.util.Iterator;
/**
* The name and field type for an item from the HPCC environment. The types may be single scalar types or may be arrays
* or structures.
*
*/
public class FieldDef implements Serializable
{
private static final long serialVersionUID = 1L;
private static final int MASK_32_LOWER_HALF = 0xffff;
private static final int MASK_32_UPPER_HALF = 0xffff0000;
private String fieldName = "";
private FieldType fieldType = FieldType.UNKNOWN;
private String typeName = FieldType.UNKNOWN.description();
private FieldDef[] defs = new FieldDef[0];
private HpccSrcType srcType = HpccSrcType.UNKNOWN;
private long len = 0;
private boolean fixedLength = false;
private boolean isUnsigned = false;
private boolean isBlob = false;
private int additionalFlags = 0;
/**
* Instantiates a new field def.
*
* @param rhs
* FieldDef to be copied
*/
public FieldDef(FieldDef rhs)
{
this.fieldName = rhs.fieldName;
this.fieldType = rhs.fieldType;
this.typeName = rhs.typeName;
this.defs = new FieldDef[rhs.defs.length];
for (int i = 0; i < rhs.defs.length; i++)
{
this.defs[i] = new FieldDef(rhs.defs[i]);
}
this.srcType = rhs.srcType;
this.len = rhs.len;
this.fixedLength = rhs.fixedLength;
this.isUnsigned = rhs.isUnsigned;
this.isBlob = rhs.isBlob;
this.additionalFlags = rhs.additionalFlags;
}
/**
* Instantiates a new field def.
*
* @param fieldName
* the name of the field
* @param fieldType
* the FieldType value
* @param typeName
* the name of this composite type
* @param len
* the field length
* @param isFixedLength
* len may be non-zero and variable
* @param isUnsigned
* Only applies to integers and decimal fields. Ignored otherwise
* @param sourceType
* the source type
* @param childDefs
* Child field defs. Only used for Records, Sets and Datasets. Sets and Dataset should have a single child. Null otherwise.
*/
public FieldDef(String fieldName, FieldType fieldType, String typeName, long len, boolean isFixedLength, boolean isUnsigned,
HpccSrcType sourceType, FieldDef[] childDefs)
{
this(fieldName, fieldType, typeName, len, isFixedLength, isUnsigned, 0, sourceType, childDefs);
}
/**
* Instantiates a new field def.
*
* @param fieldName
* the name of the field
* @param fieldType
* the FieldType value
* @param typeName
* the name of this composite type
* @param len
* the field length
* @param isFixedLength
* len may be non-zero and variable
* @param isUnsigned
* Only applies to integers and decimal fields. Ignored otherwise
* @param additionalFlags
* Additional flags. Primarily used to retain layout information in HPCC records during conversion.
* @param sourceType
* the source type
* @param childDefs
* Child field defs. Only used for Records, Sets and Datasets. Sets and Dataset should have a single child. Null otherwise.
*/
public FieldDef(String fieldName, FieldType fieldType, String typeName, long len, boolean isFixedLength, boolean isUnsigned, int additionalFlags,
HpccSrcType sourceType, FieldDef[] childDefs)
{
this.fieldName = fieldName;
this.fieldType = fieldType;
this.typeName = typeName;
this.additionalFlags = additionalFlags;
this.defs = childDefs;
if (this.defs == null)
{
this.defs = new FieldDef[0];
}
this.srcType = sourceType;
this.fixedLength = isFixedLength;
this.isUnsigned = isUnsigned;
this.len = len;
if (this.fieldType == FieldType.VAR_STRING && (sourceType.isUTF16() == false && sourceType != HpccSrcType.SINGLE_BYTE_CHAR))
{
throw new IllegalArgumentException("Invalid field defintion for: " + fieldName + "VarStrings must be encoded in either UTF16 or ASCII");
}
}
/**
* the name of the field.
*
* @return the name
*/
public String getFieldName()
{
return fieldName;
}
/**
* Sets the field name.
*
* @param newFieldName
* the new field name
*/
public void setFieldName(String newFieldName)
{
this.fieldName = newFieldName;
}
/**
* the type of the field using the FieldType ENUM type.
*
* @return the type as an enumeration value
*/
public FieldType getFieldType()
{
return fieldType;
}
/**
* Data type on the HPCC cluster.
*
* @return type enumeration
*/
public HpccSrcType getSourceType()
{
return this.srcType;
}
/**
* Sets data type on the HPCC cluster.
*
* @param srcType the new source type
*/
public void setSourceType(HpccSrcType srcType)
{
this.srcType = srcType;
}
/**
* Length of data or minimum length if variable.
*
* @param dataLen
* the new data len
*/
public void setDataLen(long dataLen)
{
this.len = dataLen;
}
/**
* Length of the data or minimum length if variable.
*
* @return length
*/
public long getDataLen()
{
if (this.fieldType != FieldType.DECIMAL)
{
return this.len;
}
if (this.isUnsigned())
{
int precision = (int) (this.len & MASK_32_LOWER_HALF);
int dataLen = (precision + 1) / 2;
return dataLen;
}
else
{
int precision = (int) (this.len & MASK_32_LOWER_HALF);
int dataLen = (precision + 2) / 2;
return dataLen;
}
}
/**
* Returns precision for decimal fields. Return 0 if this field is not a decimal
*
* @return precision
*/
public int getPrecision()
{
if (this.fieldType != FieldType.DECIMAL)
{
return 0;
}
return (int) (this.len & MASK_32_LOWER_HALF);
}
/**
* Sets precision for decimal fields.
*
* @param precision
* the new precision
*/
public void setPrecision(int precision)
{
if (this.fieldType != FieldType.DECIMAL)
{
return;
}
if (precision > 64)
{
precision = 64;
}
this.len &= MASK_32_UPPER_HALF;
this.len |= (precision & MASK_32_LOWER_HALF);
}
/**
* Returns scale for decimal fields. Return 0 if this field is not a decimal
*
* @return scale
*/
public int getScale()
{
if (this.fieldType != FieldType.DECIMAL)
{
return 0;
}
int scale = (int) (this.len >> 16);
return scale;
}
/**
* Sets scale for decimal fields.
*
* @param scale
* the new scale
*/
public void setScale(int scale)
{
if (this.fieldType != FieldType.DECIMAL)
{
return;
}
if (scale > 32)
{
scale = 32;
}
this.len &= MASK_32_LOWER_HALF;
this.len |= (scale << 16);
}
/**
* Fixed or variable length.
*
* @return true when fixed length
*/
public boolean isFixed()
{
return this.fixedLength;
}
/**
* Is the underlying value type unsigned?.
*
* @return true when unsigned
*/
public boolean isUnsigned()
{
return this.isUnsigned;
}
/**
* Is the underlying value biased? Deprecated in favor of isNonStandardInt.
*
* @return true when biased
*
* @deprecated
*/
public boolean isBiased()
{
return isNonStandardInt();
}
/**
* Is the field stored in a blob?
*
* @return true when blob
*/
public boolean isBlob()
{
return this.isBlob;
}
/**
* Sets the blob flag.
* @param blob is the field a blob?
*/
public void setIsBlob(boolean blob)
{
this.isBlob = blob;
}
/**
*
*
* @return true when biased
*/
public boolean isNonStandardInt()
{
return this.srcType == HpccSrcType.KEYED_INTEGER
|| this.srcType == HpccSrcType.SWAPPED_INTEGER
|| this.srcType == HpccSrcType.BIAS_SWAPPED_INTEGER;
}
/**
* Get the additional flags for this fields.
*
* @return the additional flags
*/
public int getAdditionalFlags()
{
return this.additionalFlags;
}
/**
* Set the additional flags for this fields.
*
* @param flags
* the new additional flags
*/
public void setAdditionalFlags(int flags)
{
this.additionalFlags = flags;
}
/**
* Number of field definitions. Zero if this is not a record
*
* @return number
*/
public int getNumDefs()
{
return this.defs.length;
}
/**
* Get the FieldDef at position. Will throw an array out of bounds exception.
*
* @param ndx
* index position
* @return the FieldDef object
*/
public FieldDef getDef(int ndx)
{
return this.defs[ndx];
}
/**
* Set the Child FieldDefs.
*
* @param childDefs
* the new defs
*/
public void setDefs(FieldDef[] childDefs)
{
if (childDefs == null)
{
childDefs = new FieldDef[0];
}
this.defs = childDefs;
updateRecordMeta(this);
}
public int getDefIndexWithFieldName(String fieldName)
{
for (int i = 0; i < this.defs.length; i++)
{
if (this.defs[i].getFieldName().equals(fieldName))
{
return i;
}
}
return -1;
}
/**
* An iterator to walk though the type definitions that compose this type.
*
* @return an iterator returning FieldDef objects
*/
public Iterator getDefinitions()
{
final FieldDef[] defRef = this.defs;
Iterator rslt = new Iterator() {
int pos = 0;
FieldDef[] copy = defRef;
@Override
public boolean hasNext()
{
return (pos < copy.length) ? true : false;
}
@Override
public FieldDef next()
{
return copy[pos++];
}
};
return rslt;
}
/**
* Update record meta.
*
* @param recordDef
* the record def
*/
private static void updateRecordMeta(FieldDef recordDef)
{
updateRecordMinLength(recordDef);
}
/**
* Update record min length.
*
* @param recordDef
* the record def
*/
private static void updateRecordMinLength(FieldDef recordDef)
{
for (int i = 0; i < recordDef.getNumDefs(); i++)
{
FieldDef childDef = recordDef.getDef(i);
if (childDef.getFieldType() == FieldType.RECORD)
{
updateRecordMinLength(childDef);
}
}
long minDataLength = getMinLengthInBytes(recordDef);
recordDef.setDataLen(minDataLength);
}
/**
* Gets the min length in bytes.
*
* @param def
* the def
* @return the min length in bytes
*/
private static long getMinLengthInBytes(FieldDef def)
{
switch (def.getFieldType())
{
case RECORD:
{
long minDataLength = 0;
for (int i = 0; i < def.getNumDefs(); i++)
{
FieldDef childDef = def.getDef(i);
minDataLength += getMinLengthInBytes(childDef);
}
return minDataLength;
}
case SET:
{
// Sets include 4 byte integer dataLength and an additional byte
return 5;
}
default:
{
long dataLength = 0;
if (def.isFixed())
{
// Var strings can be fixed length
dataLength = def.getDataLen();
if (def.getFieldType() == FieldType.VAR_STRING)
{
dataLength++;
}
// Unicode datalength is in code points not bytes
if (def.getSourceType().isUTF16())
{
dataLength *= 2;
}
}
else
{
dataLength = 4;
}
return dataLength;
}
}
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#toString()
*/
@Override
public String toString()
{
String output = "";
for (int fieldIndex = 0; fieldIndex < defs.length; fieldIndex++)
{
FieldDef currentFieldDef = defs[fieldIndex];
long dataLen = currentFieldDef.getDataLen();
output += currentFieldDef.getFieldName() + "(" + currentFieldDef.getFieldType()
+ (dataLen > 0 ? " - " + currentFieldDef.getDataLen() : "") + ")";
if (fieldIndex < defs.length - 1) output += " | ";
}
return output;
}
}
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