/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.flink.api.java.functions;
import org.apache.flink.annotation.Internal;
import org.apache.flink.api.common.operators.DualInputSemanticProperties;
import org.apache.flink.api.common.operators.SemanticProperties;
import org.apache.flink.api.common.operators.SemanticProperties.InvalidSemanticAnnotationException;
import org.apache.flink.api.common.operators.SingleInputSemanticProperties;
import org.apache.flink.api.common.operators.util.FieldSet;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.api.common.typeutils.CompositeType;
import org.apache.flink.api.common.typeutils.CompositeType.InvalidFieldReferenceException;
import org.apache.flink.api.common.typeutils.CompositeType.FlatFieldDescriptor;
import org.apache.flink.api.java.functions.FunctionAnnotation.ForwardedFields;
import org.apache.flink.api.java.functions.FunctionAnnotation.ForwardedFieldsFirst;
import org.apache.flink.api.java.functions.FunctionAnnotation.ForwardedFieldsSecond;
import org.apache.flink.api.java.functions.FunctionAnnotation.NonForwardedFields;
import org.apache.flink.api.java.functions.FunctionAnnotation.NonForwardedFieldsFirst;
import org.apache.flink.api.java.functions.FunctionAnnotation.NonForwardedFieldsSecond;
import org.apache.flink.api.java.functions.FunctionAnnotation.ReadFields;
import org.apache.flink.api.java.functions.FunctionAnnotation.ReadFieldsFirst;
import org.apache.flink.api.java.functions.FunctionAnnotation.ReadFieldsSecond;
import org.apache.flink.api.common.operators.Keys;
import org.apache.flink.api.java.typeutils.TupleTypeInfo;
import java.lang.annotation.Annotation;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Utility class that contains helper methods to work with {@link SemanticProperties}.
*/
@Internal
public final class SemanticPropUtil {
private final static String REGEX_WILDCARD = "[\\"+ Keys.ExpressionKeys.SELECT_ALL_CHAR+"\\"+ Keys.ExpressionKeys.SELECT_ALL_CHAR_SCALA+"]";
private final static String REGEX_SINGLE_FIELD = "[\\p{L}\\p{Digit}_\\$]+";
private final static String REGEX_NESTED_FIELDS = "((" + REGEX_SINGLE_FIELD + "\\.)*" + REGEX_SINGLE_FIELD + ")(\\."+ REGEX_WILDCARD +")?";
private final static String REGEX_LIST = "((" + REGEX_NESTED_FIELDS + ";)*(" + REGEX_NESTED_FIELDS + ");?)";
private final static String REGEX_FORWARD = "(("+ REGEX_NESTED_FIELDS +"|"+ REGEX_WILDCARD +")->(" + REGEX_NESTED_FIELDS + "|"+ REGEX_WILDCARD +"))";
private final static String REGEX_FIELD_OR_FORWARD = "(" + REGEX_NESTED_FIELDS + "|" + REGEX_FORWARD + ")";
private final static String REGEX_ANNOTATION = "((" + REGEX_FIELD_OR_FORWARD + ";)*(" + REGEX_FIELD_OR_FORWARD + ");?)";
private static final Pattern PATTERN_WILDCARD = Pattern.compile(REGEX_WILDCARD);
private static final Pattern PATTERN_FORWARD = Pattern.compile(REGEX_FORWARD);
private static final Pattern PATTERN_ANNOTATION = Pattern.compile(REGEX_ANNOTATION);
private static final Pattern PATTERN_LIST = Pattern.compile(REGEX_LIST);
private static final Pattern PATTERN_FIELD = Pattern.compile(REGEX_NESTED_FIELDS);
public static SingleInputSemanticProperties createProjectionPropertiesSingle(int[] fields, CompositeType<?> inType)
{
Character.isJavaIdentifierStart(1);
SingleInputSemanticProperties ssp = new SingleInputSemanticProperties();
int[] sourceOffsets = new int[inType.getArity()];
sourceOffsets[0] = 0;
for(int i=1; i<inType.getArity(); i++) {
sourceOffsets[i] = inType.getTypeAt(i-1).getTotalFields() + sourceOffsets[i-1];
}
int targetOffset = 0;
for(int i=0; i<fields.length; i++) {
int sourceOffset = sourceOffsets[fields[i]];
int numFieldsToCopy = inType.getTypeAt(fields[i]).getTotalFields();
for(int j=0; j<numFieldsToCopy; j++) {
ssp.addForwardedField(sourceOffset+j, targetOffset+j);
}
targetOffset += numFieldsToCopy;
}
return ssp;
}
public static DualInputSemanticProperties createProjectionPropertiesDual(
int[] fields, boolean[] isFromFirst, TypeInformation<?> inType1, TypeInformation<?> inType2)
{
DualInputSemanticProperties dsp = new DualInputSemanticProperties();
int[] sourceOffsets1;
if(inType1 instanceof TupleTypeInfo<?>) {
sourceOffsets1 = new int[inType1.getArity()];
sourceOffsets1[0] = 0;
for(int i=1; i<inType1.getArity(); i++) {
sourceOffsets1[i] = ((TupleTypeInfo<?>)inType1).getTypeAt(i-1).getTotalFields() + sourceOffsets1[i-1];
}
} else {
sourceOffsets1 = new int[] {0};
}
int[] sourceOffsets2;
if(inType2 instanceof TupleTypeInfo<?>) {
sourceOffsets2 = new int[inType2.getArity()];
sourceOffsets2[0] = 0;
for(int i=1; i<inType2.getArity(); i++) {
sourceOffsets2[i] = ((TupleTypeInfo<?>)inType2).getTypeAt(i-1).getTotalFields() + sourceOffsets2[i-1];
}
} else {
sourceOffsets2 = new int[] {0};
}
int targetOffset = 0;
for(int i=0; i<fields.length; i++) {
int sourceOffset;
int numFieldsToCopy;
int input;
if(isFromFirst[i]) {
input = 0;
if (fields[i] == -1) {
sourceOffset = 0;
numFieldsToCopy = inType1.getTotalFields();
} else {
sourceOffset = sourceOffsets1[fields[i]];
numFieldsToCopy = ((TupleTypeInfo<?>)inType1).getTypeAt(fields[i]).getTotalFields();
}
} else {
input = 1;
if (fields[i] == -1) {
sourceOffset = 0;
numFieldsToCopy = inType2.getTotalFields();
} else {
sourceOffset = sourceOffsets2[fields[i]];
numFieldsToCopy = ((TupleTypeInfo<?>)inType2).getTypeAt(fields[i]).getTotalFields();
}
}
for(int j=0; j<numFieldsToCopy; j++) {
dsp.addForwardedField(input, sourceOffset+j, targetOffset+j);
}
targetOffset += numFieldsToCopy;
}
return dsp;
}
/**
* Creates SemanticProperties by adding an offset to each input field index of the given SemanticProperties.
*
* @param props The SemanticProperties to which the offset is added.
* @param numInputFields The original number of fields of the input.
* @param offset The offset that is added to each input field index.
* @return New SemanticProperties with added offset.
*/
public static SingleInputSemanticProperties addSourceFieldOffset(SingleInputSemanticProperties props,
int numInputFields, int offset) {
SingleInputSemanticProperties offsetProps = new SingleInputSemanticProperties();
if (props.getReadFields(0) != null) {
FieldSet offsetReadFields = new FieldSet();
for (int r : props.getReadFields(0)) {
offsetReadFields = offsetReadFields.addField(r + offset);
}
offsetProps.addReadFields(offsetReadFields);
}
for (int s = 0; s < numInputFields; s++) {
FieldSet targetFields = props.getForwardingTargetFields(0, s);
for (int t : targetFields) {
offsetProps.addForwardedField(s + offset, t);
}
}
return offsetProps;
}
/**
* Creates SemanticProperties by adding offsets to each input field index of the given SemanticProperties.
*
* @param props The SemanticProperties to which the offset is added.
* @param numInputFields1 The original number of fields of the first input.
* @param numInputFields2 The original number of fields of the second input.
* @param offset1 The offset that is added to each input field index of the first input.
* @param offset2 The offset that is added to each input field index of the second input.
* @return New SemanticProperties with added offsets.
*/
public static DualInputSemanticProperties addSourceFieldOffsets(DualInputSemanticProperties props,
int numInputFields1, int numInputFields2,
int offset1, int offset2) {
DualInputSemanticProperties offsetProps = new DualInputSemanticProperties();
// add offset to read fields on first input
if(props.getReadFields(0) != null) {
FieldSet offsetReadFields = new FieldSet();
for(int r : props.getReadFields(0)) {
offsetReadFields = offsetReadFields.addField(r+offset1);
}
offsetProps.addReadFields(0, offsetReadFields);
}
// add offset to read fields on second input
if(props.getReadFields(1) != null) {
FieldSet offsetReadFields = new FieldSet();
for(int r : props.getReadFields(1)) {
offsetReadFields = offsetReadFields.addField(r+offset2);
}
offsetProps.addReadFields(1, offsetReadFields);
}
// add offset to forward fields on first input
for(int s = 0; s < numInputFields1; s++) {
FieldSet targetFields = props.getForwardingTargetFields(0, s);
for(int t : targetFields) {
offsetProps.addForwardedField(0, s + offset1, t);
}
}
// add offset to forward fields on second input
for(int s = 0; s < numInputFields2; s++) {
FieldSet targetFields = props.getForwardingTargetFields(1, s);
for(int t : targetFields) {
offsetProps.addForwardedField(1, s + offset2, t);
}
}
return offsetProps;
}
public static SingleInputSemanticProperties getSemanticPropsSingle(
Set<Annotation> set, TypeInformation<?> inType, TypeInformation<?> outType) {
if (set == null) {
return null;
}
Iterator<Annotation> it = set.iterator();
String[] forwarded = null;
String[] nonForwarded = null;
String[] read = null;
while (it.hasNext()) {
Annotation ann = it.next();
if (ann instanceof ForwardedFields) {
forwarded = ((ForwardedFields) ann).value();
} else if (ann instanceof NonForwardedFields) {
nonForwarded = ((NonForwardedFields) ann).value();
} else if (ann instanceof ReadFields) {
read = ((ReadFields) ann).value();
} else if (ann instanceof ForwardedFieldsFirst || ann instanceof ForwardedFieldsSecond ||
ann instanceof NonForwardedFieldsFirst || ann instanceof NonForwardedFieldsSecond ||
ann instanceof ReadFieldsFirst || ann instanceof ReadFieldsSecond) {
throw new InvalidSemanticAnnotationException("Annotation "+ann.getClass()+" invalid for single input function.");
}
}
if(forwarded != null || nonForwarded != null || read != null) {
SingleInputSemanticProperties result = new SingleInputSemanticProperties();
getSemanticPropsSingleFromString(result, forwarded, nonForwarded, read, inType, outType);
return result;
}
return null;
}
public static DualInputSemanticProperties getSemanticPropsDual(
Set<Annotation> set, TypeInformation<?> inType1, TypeInformation<?> inType2, TypeInformation<?> outType) {
if (set == null) {
return null;
}
Iterator<Annotation> it = set.iterator();
String[] forwardedFirst = null;
String[] forwardedSecond = null;
String[] nonForwardedFirst = null;
String[] nonForwardedSecond = null;
String[] readFirst = null;
String[] readSecond = null;
while (it.hasNext()) {
Annotation ann = it.next();
if (ann instanceof ForwardedFieldsFirst) {
forwardedFirst = ((ForwardedFieldsFirst) ann).value();
} else if (ann instanceof ForwardedFieldsSecond) {
forwardedSecond = ((ForwardedFieldsSecond) ann).value();
} else if (ann instanceof NonForwardedFieldsFirst) {
nonForwardedFirst = ((NonForwardedFieldsFirst) ann).value();
} else if (ann instanceof NonForwardedFieldsSecond) {
nonForwardedSecond = ((NonForwardedFieldsSecond) ann).value();
} else if (ann instanceof ReadFieldsFirst) {
readFirst = ((ReadFieldsFirst) ann).value();
} else if (ann instanceof ReadFieldsSecond) {
readSecond = ((ReadFieldsSecond) ann).value();
} else if (ann instanceof ForwardedFields || ann instanceof NonForwardedFields || ann instanceof ReadFields) {
throw new InvalidSemanticAnnotationException("Annotation " + ann.getClass() + " invalid for dual input function.");
}
}
if(forwardedFirst != null || nonForwardedFirst != null || readFirst != null ||
forwardedSecond != null ||nonForwardedSecond != null || readSecond != null) {
DualInputSemanticProperties result = new DualInputSemanticProperties();
getSemanticPropsDualFromString(result, forwardedFirst, forwardedSecond,
nonForwardedFirst, nonForwardedSecond, readFirst, readSecond, inType1, inType2, outType);
return result;
}
return null;
}
public static void getSemanticPropsSingleFromString(SingleInputSemanticProperties result,
String[] forwarded, String[] nonForwarded, String[] readSet,
TypeInformation<?> inType, TypeInformation<?> outType) {
getSemanticPropsSingleFromString(result, forwarded, nonForwarded, readSet, inType, outType, false);
}
public static void getSemanticPropsSingleFromString(SingleInputSemanticProperties result,
String[] forwarded, String[] nonForwarded, String[] readSet,
TypeInformation<?> inType, TypeInformation<?> outType,
boolean skipIncompatibleTypes) {
boolean hasForwardedAnnotation = false;
boolean hasNonForwardedAnnotation = false;
// check for forwarded annotations
if(forwarded != null && forwarded.length > 0) {
hasForwardedAnnotation = true;
}
// check non-forwarded annotations
if(nonForwarded != null && nonForwarded.length > 0) {
hasNonForwardedAnnotation = true;
}
if(hasForwardedAnnotation && hasNonForwardedAnnotation) {
throw new InvalidSemanticAnnotationException("Either ForwardedFields OR " +
"NonForwardedFields annotation permitted, NOT both.");
} else if(hasForwardedAnnotation) {
parseForwardedFields(result, forwarded, inType, outType, 0, skipIncompatibleTypes);
} else if(hasNonForwardedAnnotation) {
parseNonForwardedFields(result, nonForwarded, inType, outType, 0, skipIncompatibleTypes);
}
parseReadFields(result, readSet, inType, 0);
}
public static void getSemanticPropsDualFromString(DualInputSemanticProperties result,
String[] forwardedFirst, String[] forwardedSecond,
String[] nonForwardedFirst, String[] nonForwardedSecond, String[]
readFieldsFirst, String[] readFieldsSecond,
TypeInformation<?> inType1, TypeInformation<?> inType2, TypeInformation<?> outType) {
getSemanticPropsDualFromString(result, forwardedFirst, forwardedSecond, nonForwardedFirst,
nonForwardedSecond, readFieldsFirst, readFieldsSecond, inType1, inType2, outType,
false);
}
public static void getSemanticPropsDualFromString(DualInputSemanticProperties result,
String[] forwardedFirst, String[] forwardedSecond,
String[] nonForwardedFirst, String[] nonForwardedSecond, String[]
readFieldsFirst, String[] readFieldsSecond,
TypeInformation<?> inType1, TypeInformation<?> inType2, TypeInformation<?> outType,
boolean skipIncompatibleTypes) {
boolean hasForwardedFirstAnnotation = false;
boolean hasForwardedSecondAnnotation = false;
boolean hasNonForwardedFirstAnnotation = false;
boolean hasNonForwardedSecondAnnotation = false;
// check for forwarded annotations
if(forwardedFirst != null && forwardedFirst.length > 0) {
hasForwardedFirstAnnotation = true;
}
if(forwardedSecond != null && forwardedSecond.length > 0) {
hasForwardedSecondAnnotation = true;
}
// check non-forwarded annotations
if(nonForwardedFirst != null && nonForwardedFirst.length > 0) {
hasNonForwardedFirstAnnotation = true;
}
if(nonForwardedSecond != null && nonForwardedSecond.length > 0) {
hasNonForwardedSecondAnnotation = true;
}
if(hasForwardedFirstAnnotation && hasNonForwardedFirstAnnotation) {
throw new InvalidSemanticAnnotationException("Either ForwardedFieldsFirst OR " +
"NonForwardedFieldsFirst annotation permitted, NOT both.");
}
if(hasForwardedSecondAnnotation && hasNonForwardedSecondAnnotation) {
throw new InvalidSemanticAnnotationException("Either ForwardedFieldsSecond OR " +
"NonForwardedFieldsSecond annotation permitted, NOT both.");
}
if(hasForwardedFirstAnnotation) {
parseForwardedFields(result, forwardedFirst, inType1, outType, 0, skipIncompatibleTypes);
} else if(hasNonForwardedFirstAnnotation) {
parseNonForwardedFields(result, nonForwardedFirst, inType1, outType, 0, skipIncompatibleTypes);
}
if(hasForwardedSecondAnnotation) {
parseForwardedFields(result, forwardedSecond, inType2, outType, 1, skipIncompatibleTypes);
} else if(hasNonForwardedSecondAnnotation) {
parseNonForwardedFields(result, nonForwardedSecond, inType2, outType, 1, skipIncompatibleTypes);
}
parseReadFields(result, readFieldsFirst, inType1, 0);
parseReadFields(result, readFieldsSecond, inType2, 1);
}
private static void parseForwardedFields(SemanticProperties sp, String[] forwardedStr,
TypeInformation<?> inType, TypeInformation<?> outType, int input, boolean skipIncompatibleTypes) {
if (forwardedStr == null) {
return;
}
for (String s : forwardedStr) {
if (s == null) {
continue;
}
// remove white characters
s = s.replaceAll("\\s", "");
Matcher wcMatcher = PATTERN_WILDCARD.matcher(s);
// simple wildcard
if (wcMatcher.matches()) {
if (!inType.equals(outType)) {
if (skipIncompatibleTypes) {
continue;
}
else {
throw new InvalidSemanticAnnotationException("Forwarded field annotation \"" + s +
"\" with wildcard only allowed for identical input and output types.");
}
}
for (int i = 0; i < inType.getTotalFields(); i++) {
if (sp instanceof SingleInputSemanticProperties) {
((SingleInputSemanticProperties) sp).addForwardedField(i, i);
} else if (sp instanceof DualInputSemanticProperties) {
((DualInputSemanticProperties) sp).addForwardedField(input, i, i);
}
}
return;
}
// check format of annotation string
Matcher matcher = PATTERN_ANNOTATION.matcher(s);
if (!matcher.matches()) {
throw new InvalidSemanticAnnotationException("Invalid format of forwarded field annotation \"" + s + "\".");
}
// add forward annotations "->"
Matcher forwardMatcher = PATTERN_FORWARD.matcher(s);
while (forwardMatcher.find()) {
String sourceStr = forwardMatcher.group(2);
String targetStr = forwardMatcher.group(6);
try {
// check type compatibility
if (!areFieldsCompatible(sourceStr, inType, targetStr, outType, !skipIncompatibleTypes)) {
if (skipIncompatibleTypes) {
continue;
}
else {
throw new InvalidSemanticAnnotationException("Referenced fields of forwarded field annotation \"" + s + "\" do not match.");
}
}
List<FlatFieldDescriptor> inFFDs = getFlatFields(sourceStr, inType);
List<FlatFieldDescriptor> outFFDs = getFlatFields(targetStr, outType);
if (sp instanceof SingleInputSemanticProperties) {
for (int i = 0; i < inFFDs.size(); i++) {
int sourceField = inFFDs.get(i).getPosition();
int targetField = outFFDs.get(i).getPosition();
((SingleInputSemanticProperties) sp).addForwardedField(sourceField, targetField);
}
} else if (sp instanceof DualInputSemanticProperties) {
for (int i = 0; i < inFFDs.size(); i++) {
int sourceField = inFFDs.get(i).getPosition();
int targetField = outFFDs.get(i).getPosition();
((DualInputSemanticProperties) sp).addForwardedField(input, sourceField, targetField);
}
}
} catch (InvalidFieldReferenceException ifre) {
throw new InvalidSemanticAnnotationException("Invalid field reference in forwarded field annotation \"" + sourceStr + "->" + targetStr + "\".", ifre);
} catch (InvalidSemanticAnnotationException isae) {
throw new InvalidSemanticAnnotationException("Forwarded field annotation \"" + sourceStr + "->" + targetStr + "\" could not be added.", isae);
}
}
// remove forward annotations
s = forwardMatcher.replaceAll("");
// add forwarded annotations
Matcher listMatcher = PATTERN_LIST.matcher(s);
while (listMatcher.find()) {
String list = listMatcher.group();
Matcher fieldMatcher = PATTERN_FIELD.matcher(list);
// for each nested field
while (fieldMatcher.find()) {
String fieldStr = fieldMatcher.group();
try {
// check if field is compatible in input and output type
if (!areFieldsCompatible(fieldStr, inType, fieldStr, outType, !skipIncompatibleTypes)) {
if (skipIncompatibleTypes) {
continue;
}
else {
throw new InvalidSemanticAnnotationException("Referenced fields of forwarded field annotation \"" + s + "\" do not match.");
}
}
// add flat field positions
List<FlatFieldDescriptor> inFFDs = getFlatFields(fieldStr, inType);
List<FlatFieldDescriptor> outFFDs = getFlatFields(fieldStr, outType);
for (int i = 0; i < inFFDs.size(); i++) {
int sourcePos = inFFDs.get(i).getPosition();
int targetPos = outFFDs.get(i).getPosition();
if (sp instanceof SingleInputSemanticProperties) {
((SingleInputSemanticProperties) sp).addForwardedField(sourcePos, targetPos);
} else if (sp instanceof DualInputSemanticProperties) {
((DualInputSemanticProperties) sp).addForwardedField(input, sourcePos, targetPos);
}
}
} catch (InvalidFieldReferenceException ifre) {
throw new InvalidSemanticAnnotationException("Invalid field reference in forwarded field annotation \"" + fieldStr + "\".", ifre);
} catch (InvalidSemanticAnnotationException isae) {
throw new InvalidSemanticAnnotationException("Forwarded field annotation \"" + fieldStr + "\" could not be added.", isae);
}
}
}
}
}
private static void parseNonForwardedFields(SemanticProperties sp, String[] nonForwardedStr,
TypeInformation<?> inType, TypeInformation<?> outType, int input, boolean skipIncompatibleTypes) {
if(nonForwardedStr == null) {
return;
}
FieldSet excludedFields = new FieldSet();
for(String s : nonForwardedStr) {
// remove white characters
s = s.replaceAll("\\s", "");
if (s.equals("")) {
continue;
}
if(!inType.equals(outType)) {
if (skipIncompatibleTypes) {
continue;
}
else {
throw new InvalidSemanticAnnotationException("Non-forwarded fields annotation only allowed for identical input and output types.");
}
}
Matcher matcher = PATTERN_LIST.matcher(s);
if (!matcher.matches()) {
throw new InvalidSemanticAnnotationException("Invalid format of non-forwarded fields annotation \""+s+"\".");
}
// process individual fields
matcher = PATTERN_FIELD.matcher(s);
while (matcher.find()) {
String fieldStr = matcher.group();
try {
// get and add all flat field positions
List<FlatFieldDescriptor> inFFDs = getFlatFields(fieldStr, inType);
for (FlatFieldDescriptor ffd : inFFDs) {
excludedFields = excludedFields.addField(ffd.getPosition());
}
} catch(InvalidFieldReferenceException ifre) {
throw new InvalidSemanticAnnotationException("Invalid field reference in non-forwarded fields annotation \""+fieldStr+"\".",ifre);
}
}
}
for(int i = 0; i < inType.getTotalFields(); i++) {
if(!excludedFields.contains(i)) {
if(sp instanceof SingleInputSemanticProperties) {
((SingleInputSemanticProperties) sp).addForwardedField(i,i);
} else if(sp instanceof DualInputSemanticProperties) {
((DualInputSemanticProperties) sp).addForwardedField(input, i, i);
}
}
}
}
private static void parseReadFields(SemanticProperties sp, String[] readFieldStrings, TypeInformation<?> inType, int input) {
if(readFieldStrings == null) {
return;
}
for(String s : readFieldStrings) {
FieldSet readFields = new FieldSet();
// remove white characters
s = s.replaceAll("\\s", "");
Matcher wcMatcher = PATTERN_WILDCARD.matcher(s);
// simple wildcard
if (wcMatcher.matches()) {
// add all fields
for (int i = 0; i < inType.getTotalFields(); i++) {
readFields = readFields.addField(i);
}
} else {
// process field list
Matcher matcher = PATTERN_LIST.matcher(s);
if (!matcher.matches()) {
throw new InvalidSemanticAnnotationException("Invalid format of read field annotation \"" + s + "\".");
}
// process field
matcher = PATTERN_FIELD.matcher(s);
while (matcher.find()) {
String fieldStr = matcher.group();
try {
List<FlatFieldDescriptor> ffds = getFlatFields(fieldStr, inType);
// get and add flat field positions
for (FlatFieldDescriptor ffd : ffds) {
readFields = readFields.addField(ffd.getPosition());
}
} catch (InvalidFieldReferenceException ifre) {
throw new InvalidSemanticAnnotationException("Invalid field reference in read field annotation \"" + fieldStr + "\".", ifre);
}
}
}
if (sp instanceof SingleInputSemanticProperties) {
((SingleInputSemanticProperties) sp).addReadFields(readFields);
} else if (sp instanceof DualInputSemanticProperties) {
((DualInputSemanticProperties) sp).addReadFields(input, readFields);
}
}
}
////////////////////// UTIL METHODS ///////////////////////////////
private static boolean areFieldsCompatible(String sourceField, TypeInformation<?> inType, String targetField,
TypeInformation<?> outType, boolean throwException) {
try {
// get source type information
TypeInformation<?> sourceType = getExpressionTypeInformation(sourceField, inType);
// get target type information
TypeInformation<?> targetType = getExpressionTypeInformation(targetField, outType);
return sourceType.equals(targetType);
}
catch (InvalidFieldReferenceException e) {
if (throwException) {
throw e;
}
else {
return false;
}
}
}
private static TypeInformation<?> getExpressionTypeInformation(String fieldStr, TypeInformation<?> typeInfo) {
Matcher wildcardMatcher = PATTERN_WILDCARD.matcher(fieldStr);
if(wildcardMatcher.matches()) {
return typeInfo;
} else {
Matcher expMatcher = PATTERN_FIELD.matcher(fieldStr);
if(!expMatcher.matches()) {
throw new InvalidFieldReferenceException("Invalid field expression \""+fieldStr+"\".");
}
if(typeInfo instanceof CompositeType<?>) {
return ((CompositeType<?>) typeInfo).getTypeAt(expMatcher.group(1));
} else {
throw new InvalidFieldReferenceException("Nested field expression \""+fieldStr+"\" not possible on atomic type ("+typeInfo+").");
}
}
}
private static List<FlatFieldDescriptor> getFlatFields(String fieldStr, TypeInformation<?> typeInfo) {
if(typeInfo instanceof CompositeType<?>) {
return ((CompositeType<?>) typeInfo).getFlatFields(fieldStr);
} else {
Matcher wildcardMatcher = PATTERN_WILDCARD.matcher(fieldStr);
if(wildcardMatcher.matches()) {
return Collections.singletonList(new FlatFieldDescriptor(0, typeInfo));
} else {
throw new InvalidFieldReferenceException("Nested field expression \""+fieldStr+"\" not possible on atomic type ("+typeInfo+").");
}
}
}
/**
* Private constructor to prevent instantiation.
*/
private SemanticPropUtil() {
throw new RuntimeException();
}
}