eu.annocultor.triple.ValueHelper.java Source code

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Here is the source code for eu.annocultor.triple.ValueHelper.java

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/*
 * Copyright 2005-2009 the original author or authors.
 * 
 * Licensed 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 eu.annocultor.triple;

import org.apache.commons.lang.StringUtils;

public class ValueHelper {
    public static boolean isLiteral(Value value) {
        if (value == null)
            return false;
        return (value instanceof LiteralValue);
    }

    public static boolean isResource(Value value) {
        if (value == null)
            return false;
        return (value instanceof ResourceValue);
    }

    public static String lang(Value value, String prefix, String defaultValue) {
        String lang = null;
        if (isLiteral(value)) {
            lang = ((LiteralValue) value).getLang();
        }
        return StringUtils.isBlank(lang) ? defaultValue : (prefix + lang);
    }
}