org.apache.somewhere.general.LiteralImpl.java Source code

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Here is the source code for org.apache.somewhere.general.LiteralImpl.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.somewhere.general;

import java.util.Objects;
import java.util.Optional;

import org.apache.commons.rdf.api.IRI;
import org.apache.commons.rdf.api.Literal;

public class LiteralImpl implements Literal {
    private final String lex;
    private final IRI datatype;
    private final Optional<String> lang;

    /* package */ LiteralImpl(String lex, IRI datatype, String lang) {
        this.lex = lex;
        this.datatype = datatype;
        if (lang != null)
            validateLang(lang);
        this.lang = Optional.ofNullable(lang);
    }

    private static void validateLang(String languageTag) {
        if (languageTag.contains(" "))
            throw new IllegalArgumentException();
    }

    private static String QUOTE = "\"";

    @Override
    public String ntriplesString() {
        StringBuilder sb = new StringBuilder();
        sb.append(QUOTE);
        // Escape special characters
        sb.append(getLexicalForm().replace("\\", "\\\\"). // escaped to \\
                replace("\"", "\\\""). // escaped to \"
                replace("\r", "\\r"). // escaped to \r
                replace("\n", "\\n")); // escaped to \n
        sb.append(QUOTE);

        // getLanguageTag().ifPresent(s -> sb.append("@" + s));
        if (getLanguageTag().isPresent()) {
            sb.append("@");
            sb.append(getLanguageTag().get());
        } else if (!getDatatype().equals(C.xsdString)) {
            sb.append("^^");
            sb.append(getDatatype().ntriplesString());
        }
        return sb.toString();
    }

    @Override
    public String getLexicalForm() {
        return lex;
    }

    @Override
    public IRI getDatatype() {
        return datatype;
    }

    @Override
    public Optional<String> getLanguageTag() {
        return lang;
    }

    @Override
    public int hashCode() {
        return Objects.hash(getLexicalForm(), getDatatype(), getLanguageTag());
    }

    @Override
    public boolean equals(Object other) {
        if (other == this)
            return true;
        if (other == null)
            return false;
        if (!(other instanceof Literal))
            return false;
        Literal literal = (Literal) other;
        return getLexicalForm().equals(literal.getLexicalForm())
                && getLanguageTag().equals(literal.getLanguageTag()) && getDatatype().equals(literal.getDatatype());
    }
}