// 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.language.Language;

/**
 * Sets the language in the execution context.
 *
 * @author Simon Thoresen Hult
 */
public final class SetLanguageExpression extends Expression {

    public SetLanguageExpression() {
        super(DataType.STRING);
    }
    @Override
    protected void doExecute(ExecutionContext context) {
        context.setLanguage(Language.fromLanguageTag(String.valueOf(context.getValue())));
    }

    @Override
    protected void doVerify(VerificationContext context) {
        // empty
    }

    @Override
    public DataType createdOutputType() {
        return null;
    }

    @Override
    public String toString() {
        return "set_language";
    }

    @Override
    public boolean equals(Object obj) {
        if (!(obj instanceof SetLanguageExpression)) return false;
        return true;
    }

    @Override
    public int hashCode() {
        return getClass().hashCode();
    }

}