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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.indexinglanguage.expressions;
import com.yahoo.document.*;
import com.yahoo.document.datatypes.Array;
import com.yahoo.document.datatypes.FieldValue;
import com.yahoo.document.datatypes.Struct;
import com.yahoo.document.datatypes.WeightedSet;
import com.yahoo.vespa.indexinglanguage.FieldValueConverter;
import com.yahoo.vespa.objects.ObjectOperation;
import com.yahoo.vespa.objects.ObjectPredicate;
/**
* @author Simon Thoresen Hult
*/
public final class ForEachExpression extends CompositeExpression {
private final Expression exp;
public ForEachExpression(Expression exp) {
super(UnresolvedDataType.INSTANCE);
this.exp = exp;
}
public Expression getInnerExpression() {
return exp;
}
@Override
public void setStatementOutput(DocumentType documentType, Field field) {
exp.setStatementOutput(documentType, field);
}
@Override
protected void doExecute(final ExecutionContext context) {
FieldValue input = context.getValue();
if (input instanceof Array || input instanceof WeightedSet) {
FieldValue next = new MyConverter(context, exp).convert(input);
if (next == null) {
VerificationContext vctx = new VerificationContext(context);
vctx.setValueType(input.getDataType()).execute(this);
next = vctx.getValueType().createFieldValue();
}
context.setValue(next);
} else if (input instanceof Struct) {
context.setValue(new MyConverter(context, exp).convert(input));
} else {
throw new IllegalArgumentException("Expected Array, Struct or WeightedSet input, got " +
input.getDataType().getName() + ".");
}
}
@Override
protected void doVerify(VerificationContext context) {
DataType valueType = context.getValueType();
if (valueType instanceof ArrayDataType || valueType instanceof WeightedSetDataType) {
// Set type for block evaluation
context.setValueType(((CollectionDataType)valueType).getNestedType());
// Evaluate block, which sets value>Type to the output of the block
context.execute(exp);
// Value type outside block becomes the collection type having the block output type as argument
if (valueType instanceof ArrayDataType) {
context.setValueType(DataType.getArray(context.getValueType()));
} else {
WeightedSetDataType wset = (WeightedSetDataType)valueType;
context.setValueType(DataType.getWeightedSet(context.getValueType(), wset.createIfNonExistent(), wset.removeIfZero()));
}
}
else if (valueType instanceof StructDataType) {
for (Field field : ((StructDataType)valueType).getFields()) {
DataType fieldType = field.getDataType();
DataType structValueType = context.setValueType(fieldType).execute(exp).getValueType();
if (!fieldType.isAssignableFrom(structValueType))
throw new VerificationException(this, "Expected " + fieldType.getName() + " output, got " +
structValueType.getName() + ".");
}
context.setValueType(valueType);
}
else {
throw new VerificationException(this, "Expected Array, Struct or WeightedSet input, got " +
valueType.getName() + ".");
}
}
@Override
public DataType createdOutputType() {
if (exp.createdOutputType() == null) {
return null;
}
return UnresolvedDataType.INSTANCE;
}
@Override
public String toString() {
return "for_each { " + exp + " }";
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof ForEachExpression rhs)) return false;
if (!exp.equals(rhs.exp)) return false;
return true;
}
@Override
public int hashCode() {
return getClass().hashCode() + exp.hashCode();
}
private static final class MyConverter extends FieldValueConverter {
final ExecutionContext context;
final Expression expression;
int depth = 0;
MyConverter(ExecutionContext context, Expression expression) {
this.context = context;
this.expression = expression;
}
@Override
protected boolean shouldConvert(FieldValue value) {
return ++depth > 1;
}
@Override
protected FieldValue doConvert(FieldValue value) {
context.setValue(value).execute(expression);
return context.getValue();
}
}
@Override
public void selectMembers(ObjectPredicate predicate, ObjectOperation operation) {
select(exp, predicate, operation);
}
}
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