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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.ArrayDataType;
import com.yahoo.document.CollectionDataType;
import com.yahoo.document.DataType;
import com.yahoo.document.WeightedSetDataType;
import com.yahoo.document.datatypes.Array;
import com.yahoo.document.datatypes.FieldValue;
import com.yahoo.document.datatypes.StringFieldValue;
import com.yahoo.document.datatypes.WeightedSet;
import com.yahoo.vespa.indexinglanguage.ExpressionConverter;
import java.util.*;
/**
* @author Simon Thoresen Hult
*/
public final class CatExpression extends ExpressionList<Expression> {
public CatExpression(Expression... lst) {
this(Arrays.asList(lst));
}
public CatExpression(Collection<? extends Expression> lst) {
super(lst, resolveInputType(lst));
}
@Override
public CatExpression convertChildren(ExpressionConverter converter) {
return new CatExpression(convertChildList(converter));
}
@Override
protected void doExecute(ExecutionContext context) {
FieldValue input = context.getValue();
DataType inputType = input != null ? input.getDataType() : null;
VerificationContext ver = new VerificationContext(context);
List<FieldValue> values = new LinkedList<>();
List<DataType> types = new LinkedList<>();
for (Expression exp : this) {
FieldValue val = context.setValue(input).execute(exp).getValue();
values.add(val);
DataType type;
if (val != null) {
type = val.getDataType();
} else {
type = ver.setValueType(inputType).execute(this).getValueType();
}
types.add(type);
}
DataType type = resolveOutputType(types);
context.setValue(type == DataType.STRING ? asString(values) : asCollection(type, values));
}
@Override
protected void doVerify(VerificationContext context) {
DataType input = context.getValueType();
List<DataType> types = new LinkedList<>();
for (Expression exp : this) {
DataType val = context.setValueType(input).execute(exp).getValueType();
types.add(val);
if (val == null) {
throw new VerificationException(this, "Attempting to concatenate a null value (" + exp + ")");
}
}
context.setValueType(resolveOutputType(types));
}
private static DataType resolveInputType(Collection<? extends Expression> list) {
DataType prev = null;
for (Expression exp : list) {
DataType next = exp.requiredInputType();
if (next == null) {
// ignore
} else if (prev == null) {
prev = next;
} else if (!prev.isAssignableFrom(next)) {
throw new VerificationException(CatExpression.class, "Operands require conflicting input types, " +
prev.getName() + " vs " + next.getName());
}
}
return prev;
}
@Override
public DataType createdOutputType() {
return UnresolvedDataType.INSTANCE;
}
@Override
public String toString() {
StringBuilder ret = new StringBuilder();
for (Iterator<Expression> it = iterator(); it.hasNext();) {
ret.append(it.next());
if (it.hasNext()) {
ret.append(" . ");
}
}
return ret.toString();
}
@Override
public boolean equals(Object obj) {
return super.equals(obj) && obj instanceof CatExpression;
}
private static DataType resolveOutputType(List<DataType> types) {
DataType ret = null;
for (DataType type : types) {
if (!(type instanceof CollectionDataType)) {
return DataType.STRING;
}
if (ret == null) {
ret = type;
} else if (!ret.isAssignableFrom(type)) {
return DataType.STRING;
}
}
return ret;
}
private static FieldValue asString(List<FieldValue> outputs) {
StringBuilder ret = new StringBuilder();
for (FieldValue val : outputs) {
if (val == null) {
return null;
}
ret.append(val.toString());
}
return new StringFieldValue(ret.toString());
}
private static FieldValue asCollection(DataType type, List<FieldValue> values) {
if (type instanceof ArrayDataType) {
return asArray((ArrayDataType)type, values);
} else if (type instanceof WeightedSetDataType) {
return asWset((WeightedSetDataType)type, values);
} else {
throw new UnsupportedOperationException(type.getName());
}
}
@SuppressWarnings({ "unchecked", "rawtypes" })
private static FieldValue asArray(ArrayDataType arrType, List<FieldValue> values) {
Array out = arrType.createFieldValue();
for (FieldValue val : values) {
if (val == null) {
continue;
}
out.addAll((Array)val);
}
return out;
}
@SuppressWarnings({ "unchecked", "rawtypes" })
private static FieldValue asWset(WeightedSetDataType wsetType, List<FieldValue> values) {
WeightedSet out = wsetType.createFieldValue();
for (FieldValue val : values) {
if (val == null) {
continue;
}
out.putAll((WeightedSet)val);
}
return out;
}
}
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