edu.unc.lib.dl.xml.JDOMQueryUtil.java Source code

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Here is the source code for edu.unc.lib.dl.xml.JDOMQueryUtil.java

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/**
 * Copyright 2008 The University of North Carolina at Chapel Hill
 *
 * 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 edu.unc.lib.dl.xml;

import java.text.ParseException;
import java.util.Date;
import java.util.List;

import org.jdom2.Element;
import org.jdom2.Namespace;

import edu.unc.lib.dl.util.DateTimeUtil;

public class JDOMQueryUtil {

    public static Element getElementByAttribute(List<?> elements, String attribute, String value) {
        return getElementByAttribute(elements, attribute, null, value);
    }

    public static Element getElementByAttribute(List<?> elements, String attribute, Namespace attributeNS,
            String value) {
        for (Object elementObj : elements) {
            Element element = (Element) elementObj;
            String attrValue = attributeNS == null ? element.getAttributeValue(attribute)
                    : element.getAttributeValue(attribute, attributeNS);
            if (attrValue == value || (value != null && value.equals(attrValue))) {
                return element;
            }
        }
        return null;
    }

    public static Element getChildByAttribute(Element parent, String childName, Namespace namespace,
            String attribute, String value) {
        List<?> elements;
        if (childName != null) {
            if (namespace != null)
                elements = parent.getChildren(childName, namespace);
            else
                elements = parent.getChildren(childName);
        } else {
            elements = parent.getChildren();
        }
        return getElementByAttribute(elements, attribute, value);
    }

    public static Date parseISO6392bDateChild(Element parent, String childName, Namespace namespace) {
        String dateString = parent.getChildText(childName, namespace);
        if (dateString != null) {
            try {
                return DateTimeUtil.parsePartialUTCToDate(dateString);
            } catch (ParseException e) {
                // Wasn't a valid date, ignore it.
            } catch (IllegalArgumentException e) {
                // Wasn't a valid date, ignore it.
            }
        }
        return null;
    }
}