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// Copyright 2016 Yahoo Inc. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.searchdefinition.derived;
import com.yahoo.document.DataType;
import com.yahoo.document.PositionDataType;
import com.yahoo.searchdefinition.Search;
import com.yahoo.searchdefinition.document.ImmutableSDField;
import com.yahoo.vespa.configdefinition.IlscriptsConfig;
import com.yahoo.vespa.configdefinition.IlscriptsConfig.Ilscript.Builder;
import com.yahoo.vespa.indexinglanguage.ExpressionVisitor;
import com.yahoo.vespa.indexinglanguage.expressions.ClearStateExpression;
import com.yahoo.vespa.indexinglanguage.expressions.Expression;
import com.yahoo.vespa.indexinglanguage.expressions.GuardExpression;
import com.yahoo.vespa.indexinglanguage.expressions.InputExpression;
import com.yahoo.vespa.indexinglanguage.expressions.OutputExpression;
import com.yahoo.vespa.indexinglanguage.expressions.PassthroughExpression;
import com.yahoo.vespa.indexinglanguage.expressions.ScriptExpression;
import com.yahoo.vespa.indexinglanguage.expressions.StatementExpression;
import com.yahoo.vespa.indexinglanguage.expressions.ZCurveExpression;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
/**
* An indexing language script derived from a search definition. An indexing script contains a set of indexing
* statements, organized in a composite structure of indexing code snippets.
*
* @author bratseth
*/
public final class IndexingScript extends Derived implements IlscriptsConfig.Producer {
private final List<String> docFields = new LinkedList<>();
private final List<Expression> expressions = new LinkedList<>();
public IndexingScript(Search search) {
derive(search);
}
@Override
protected void derive(ImmutableSDField field, Search search) {
if (field.isImportedField()) {
return;
}
if (!field.isExtraField()) {
docFields.add(field.getName());
}
if (field.usesStructOrMap() &&
!field.getDataType().equals(PositionDataType.INSTANCE) &&
!field.getDataType().equals(DataType.getArray(PositionDataType.INSTANCE)))
{
return; // unsupported
}
ScriptExpression script = field.getIndexingScript();
if (!script.isEmpty()) {
expressions.add(new StatementExpression(new ClearStateExpression(),
new GuardExpression(script)));
}
}
public Iterable<Expression> expressions() {
return Collections.unmodifiableCollection(expressions);
}
@Override
public String getDerivedName() {
return "ilscripts";
}
@Override
public void getConfig(IlscriptsConfig.Builder configBuilder) {
IlscriptsConfig.Ilscript.Builder ilscriptBuilder = new IlscriptsConfig.Ilscript.Builder();
ilscriptBuilder.doctype(getName());
for (String fieldName : docFields) {
ilscriptBuilder.docfield(fieldName);
}
addContentInOrder(ilscriptBuilder);
configBuilder.ilscript(ilscriptBuilder);
}
private void addContentInOrder(IlscriptsConfig.Ilscript.Builder ilscriptBuilder) {
ArrayList<Expression> later = new ArrayList<>();
Set<String> touchedFields = new HashSet<String>();
for (Expression exp : expressions) {
FieldScanVisitor fieldFetcher = new FieldScanVisitor();
if (modifiesSelf(exp)) {
later.add(exp);
} else {
ilscriptBuilder.content(exp.toString());
}
fieldFetcher.visit(exp);
touchedFields.addAll(fieldFetcher.touchedFields());
}
for (Expression exp : later) {
ilscriptBuilder.content(exp.toString());
}
generateSyntheticStatementsForUntouchedFields(ilscriptBuilder, touchedFields);
}
private void generateSyntheticStatementsForUntouchedFields(Builder ilscriptBuilder, Set<String> touchedFields) {
Set<String> fieldsWithSyntheticStatements = new HashSet<String>(docFields);
fieldsWithSyntheticStatements.removeAll(touchedFields);
List<String> orderedFields = new ArrayList<String>(fieldsWithSyntheticStatements);
Collections.sort(orderedFields);
for (String fieldName : orderedFields) {
StatementExpression copyField = new StatementExpression(new InputExpression(fieldName),
new PassthroughExpression(fieldName));
ilscriptBuilder.content(copyField.toString());
}
}
private boolean modifiesSelf(Expression exp) {
MyExpVisitor visitor = new MyExpVisitor();
visitor.visit(exp);
return visitor.modifiesSelf();
}
private class MyExpVisitor extends ExpressionVisitor {
private String inputField = null;
private String outputField = null;
public boolean modifiesSelf() { return outputField != null && outputField.equals(inputField); }
@Override
protected void doVisit(Expression expression) {
if (modifiesSelf()) {
return;
}
if (expression instanceof InputExpression) {
inputField = ((InputExpression) expression).getFieldName();
}
if (expression instanceof OutputExpression) {
outputField = ((OutputExpression) expression).getFieldName();
}
}
}
private static class FieldScanVisitor extends ExpressionVisitor {
List<String> touchedFields = new ArrayList<String>();
List<String> candidates = new ArrayList<String>();
@Override
protected void doVisit(Expression exp) {
if (exp instanceof OutputExpression) {
touchedFields.add(((OutputExpression) exp).getFieldName());
}
if (exp instanceof InputExpression) {
candidates.add(((InputExpression) exp).getFieldName());
}
if (exp instanceof ZCurveExpression) {
touchedFields.addAll(candidates);
}
}
Collection<String> touchedFields() {
Collection<String> output = touchedFields;
touchedFields = null; // deny re-use to try and avoid obvious bugs
return output;
}
}
}
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