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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.DataType;
import com.yahoo.document.datatypes.Array;
import com.yahoo.document.datatypes.FieldValue;
import com.yahoo.document.datatypes.StringFieldValue;
import com.yahoo.text.StringUtilities;
import java.util.Iterator;
/**
* @author Simon Thoresen Hult
*/
public final class JoinExpression extends Expression {
private final String delimiter;
public JoinExpression(String delimiter) {
super(UnresolvedDataType.INSTANCE);
this.delimiter = delimiter;
}
public String getDelimiter() {
return delimiter;
}
@SuppressWarnings({ "unchecked" })
@Override
protected void doExecute(ExecutionContext context) {
FieldValue input = context.getValue();
if (!(input instanceof Array)) {
throw new IllegalArgumentException("Expected Array input, got " + input.getDataType().getName());
}
StringBuilder output = new StringBuilder();
for (Iterator<FieldValue> it = ((Array)input).fieldValueIterator(); it.hasNext(); ) {
output.append(it.next());
if (it.hasNext()) {
output.append(delimiter);
}
}
context.setValue(new StringFieldValue(output.toString()));
}
@Override
protected void doVerify(VerificationContext context) {
DataType input = context.getValueType();
if (!(input instanceof ArrayDataType)) {
throw new VerificationException(this, "Expected Array input, got " + input.getName());
}
context.setValueType(createdOutputType());
}
@Override
public DataType createdOutputType() {
return DataType.STRING;
}
@Override
public String toString() {
return "join \"" + StringUtilities.escape(delimiter, '"') + "\"";
}
@Override
public boolean equals(Object obj) {
if (!(obj instanceof JoinExpression rhs)) return false;
if (!delimiter.equals(rhs.delimiter)) return false;
return true;
}
@Override
public int hashCode() {
return getClass().hashCode() + delimiter.hashCode();
}
}
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