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// Copyright Vespa.ai. 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.datatypes.Array;
import com.yahoo.document.datatypes.StringFieldValue;
import com.yahoo.text.StringUtilities;
import java.util.regex.Pattern;
/**
* @author Simon Thoresen Hult
*/
public final class SplitExpression extends Expression {
private final Pattern splitPattern;
public SplitExpression(String splitString) {
super(DataType.STRING);
this.splitPattern = Pattern.compile(splitString);
}
public Pattern getSplitPattern() {
return splitPattern;
}
@Override
protected void doExecute(ExecutionContext context) {
String input = String.valueOf(context.getValue());
Array<StringFieldValue> output = new Array<>(DataType.getArray(DataType.STRING));
if (!input.isEmpty()) {
String[] splits = splitPattern.split(input);
for (String split : splits) {
output.add(new StringFieldValue(split));
}
}
context.setValue(output);
}
@Override
protected void doVerify(VerificationContext context) {
context.setValueType(createdOutputType());
}
@Override
public DataType createdOutputType() {
return DataType.getArray(DataType.STRING);
}
@Override
public String toString() {
return "split \"" + StringUtilities.escape(splitPattern.toString(), '"') + "\"";
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof SplitExpression rhs)) return false;
if (!splitPattern.toString().equals(rhs.splitPattern.toString())) return false;
return true;
}
@Override
public int hashCode() {
return getClass().hashCode() + splitPattern.toString().hashCode();
}
}
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