com.sangupta.jerry.util.DomUtils.java Source code

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Here is the source code for com.sangupta.jerry.util.DomUtils.java

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/**
 *
 * jerry - Common Java Functionality
 * Copyright (c) 2012-2015, Sandeep Gupta
 * 
 * http://sangupta.com/projects/jerry
 * 
 * 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 com.sangupta.jerry.util;

import java.util.ArrayList;
import java.util.List;

import org.jdom2.Attribute;
import org.jdom2.DataConversionException;
import org.jdom2.Element;

/**
 * @author sangupta
 *
 */
public class DomUtils {

    /**
     * Returns the value of the attribute from the element.
     * 
     * @param element
     * @param attributeName
     */
    public static String getAttributeValue(Element element, String attributeName) {
        Attribute attribute = element.getAttribute(attributeName);
        if (attribute != null) {
            return attribute.getValue();
        }

        return null;
    }

    /**
     * Returns the integer value of the attribute from the element.
     * 
     * @param element
     * @param attributeName
     */
    public static int getAttributeValueAsInt(Element element, String attributeName) {
        Attribute attribute = element.getAttribute(attributeName);
        if (attribute != null) {
            try {
                return attribute.getIntValue();
            } catch (DataConversionException e) {
                e.printStackTrace();
            }
        }

        return 0;
    }

    /**
     * Returns the value of a given attribute for the given tagName amongst the
     * supplied foreign markup values.
     * 
     * @param tagName
     *            the tag name to find
     * 
     * @param attributeName
     *            the attribute name to extract
     * 
     * @param elements
     *            list of elements to search in
     * 
     * @return the value of the attribute if found, <code>null</code> otherwise
     */
    public static String getTagAttribute(String tagName, String attributeName, List<Element> elements) {
        for (Element element : elements) {
            if (tagName.equals(element.getName())) {
                Attribute attribute = element.getAttribute(attributeName);
                if (attribute != null) {
                    return attribute.getValue();
                }
            }
        }

        return null;
    }

    /**
     * Returns the value of the element with the given tagName, where the
     * supplied attribute matches the supplied attribute value in the supplied
     * foreign markup values.
     * 
     * @param tagName
     *            the tag to search for
     * 
     * @param attributeName
     *            the attribute name to look for
     * 
     * @param attributeValue
     *            the attribute value to look for
     * 
     * @param elements
     *            the elements to search in
     * 
     * @return all the values of the attributes which have matched
     * 
     */
    public static List<String> getTagValues(String tagName, String attributeName, String attributeValue,
            List<Element> elements) {
        List<String> values = new ArrayList<String>();

        for (Element element : elements) {
            if (tagName.equals(element.getName())) {
                String value = element.getAttribute(attributeName).getValue();
                if (attributeValue.equals(value)) {
                    values.add(element.getText());
                }
            }
        }

        return values;
    }

    /**
     * Returns the value of the element with the given tagName amongst the
     * supplied foreign markup values.
     * 
     * @param tagName
     *            the tag name to look for
     * 
     * @param elements
     *            the elements to search in
     * 
     * @return list of all values that match the tag name
     * 
     */
    public static List<String> getTagValues(String tagName, List<Element> elements) {
        List<String> values = new ArrayList<String>();

        for (Element element : elements) {
            if (tagName.equals(element.getName())) {
                values.add(element.getText());
            }
        }

        return values;
    }

}