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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.DataType;
import com.yahoo.document.DocumentType;
import com.yahoo.document.Field;
import com.yahoo.document.datatypes.FieldValue;
import com.yahoo.document.datatypes.StringFieldValue;
import com.yahoo.text.StringUtilities;
import com.yahoo.vespa.indexinglanguage.ExpressionConverter;
import com.yahoo.vespa.objects.ObjectOperation;
import com.yahoo.vespa.objects.ObjectPredicate;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.Map;
/**
* @author Simon Thoresen Hult
*/
public final class SwitchExpression extends CompositeExpression {
private final Map<String, Expression> cases = new LinkedHashMap<>();
private final Expression defaultExp;
public <T extends Expression> SwitchExpression(Map<String, T> cases) {
this(cases, null);
}
public <T extends Expression> SwitchExpression(Map<String, T> cases, Expression defaultExp) {
super(null);
this.defaultExp = defaultExp;
this.cases.putAll(cases);
}
@Override
public SwitchExpression convertChildren(ExpressionConverter converter) {
var convertedCases = new LinkedHashMap<String, Expression>();
for (var entry : cases.entrySet()) {
var converted = converter.branch().convert(entry.getValue());
if (converted != null)
convertedCases.put(entry.getKey(), converted);
}
return new SwitchExpression(convertedCases, converter.branch().convert(defaultExp));
}
public boolean isEmpty() {
return defaultExp == null && cases.isEmpty();
}
public Map<String, Expression> getCases() {
return Collections.unmodifiableMap(cases);
}
public Expression getDefaultExpression() {
return defaultExp;
}
@Override
public void setStatementOutput(DocumentType documentType, Field field) {
defaultExp.setStatementOutput(documentType, field);
for (var expression : cases.values())
expression.setStatementOutput(documentType, field);
}
@Override
protected void doExecute(ExecutionContext context) {
FieldValue input = context.getValue();
Expression exp = null;
if (input != null) {
if (!(input instanceof StringFieldValue)) {
throw new IllegalArgumentException("Expected " + DataType.STRING.getName() + " input, got " +
input.getDataType().getName());
}
exp = cases.get(String.valueOf(input));
}
if (exp == null) {
exp = defaultExp;
}
if (exp != null) {
exp.execute(context);
}
context.setValue(input);
}
@Override
public void selectMembers(ObjectPredicate predicate, ObjectOperation operation) {
select(defaultExp, predicate, operation);
for (Expression exp : cases.values()) {
select(exp, predicate, operation);
}
}
@Override
protected void doVerify(VerificationContext context) {
DataType input = context.getValueType();
if (input == null) {
throw new VerificationException(this, "Expected " + DataType.STRING.getName() + " input, but no input is specified");
}
if (input != DataType.STRING) {
throw new VerificationException(this, "Expected " + DataType.STRING.getName() + " input, got " +
input.getName());
}
for (Expression exp : cases.values()) {
context.setValueType(input).execute(exp);
}
context.setValueType(input).execute(defaultExp);
context.setValueType(input);
}
@Override
public DataType createdOutputType() {
return null;
}
@Override
public String toString() {
StringBuilder ret = new StringBuilder();
ret.append("switch { ");
for (Map.Entry<String, Expression> entry : cases.entrySet()) {
ret.append("case \"").append(StringUtilities.escape(entry.getKey(), '"')).append("\": ");
Expression exp = entry.getValue();
ret.append(exp).append("; ");
}
if (defaultExp != null) {
ret.append("default: ").append(defaultExp).append("; ");
}
ret.append("}");
return ret.toString();
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof SwitchExpression rhs)) return false;
if (!cases.equals(rhs.cases)) return false;
if (!equals(defaultExp, rhs.defaultExp)) return false;
return true;
}
@Override
public int hashCode() {
return getClass().hashCode() + (defaultExp != null ? defaultExp.hashCode() : 0);
}
}
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