org.eclipse.rdf4j.spin.function.spif.BuildString.java Source code

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Here is the source code for org.eclipse.rdf4j.spin.function.spif.BuildString.java

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/*******************************************************************************
 * Copyright (c) 2015 Eclipse RDF4J contributors, Aduna, and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Distribution License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *******************************************************************************/
package org.eclipse.rdf4j.spin.function.spif;

import java.util.HashMap;
import java.util.Map;

import org.apache.commons.lang.text.StrSubstitutor;
import org.eclipse.rdf4j.model.Literal;
import org.eclipse.rdf4j.model.Value;
import org.eclipse.rdf4j.model.ValueFactory;
import org.eclipse.rdf4j.model.vocabulary.SPIF;
import org.eclipse.rdf4j.query.algebra.evaluation.ValueExprEvaluationException;
import org.eclipse.rdf4j.query.algebra.evaluation.function.Function;

public class BuildString implements Function {

    @Override
    public String getURI() {
        return SPIF.BUILD_STRING_FUNCTION.toString();
    }

    @Override
    public Value evaluate(ValueFactory valueFactory, Value... args) throws ValueExprEvaluationException {
        if (args.length < 1) {
            throw new ValueExprEvaluationException("Incorrect number of arguments");
        }
        if (!(args[0] instanceof Literal)) {
            throw new ValueExprEvaluationException("First argument must be a string");
        }
        Literal s = (Literal) args[0];
        String tmpl = s.getLabel();
        Map<String, String> mappings = new HashMap<String, String>(args.length);
        for (int i = 1; i < args.length; i++) {
            mappings.put(Integer.toString(i), args[i].stringValue());
        }
        String newValue = StrSubstitutor.replace(tmpl, mappings, "{?", "}");
        return valueFactory.createLiteral(newValue);
    }
}