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package org.custommonkey.xmlunit.examples;

import org.custommonkey.xmlunit.ElementNameAndTextQualifier;
import org.custommonkey.xmlunit.ElementQualifier;
import org.xmlunit.diff.MultiLevelByNameAndTextSelector;
import org.xmlunit.diff.ElementSelector;

import org.w3c.dom.Element;

/**
 * Per popular request an interface implementation that uses element
 * names and the text node containes in the n'th child node to compare
 * elements.
 *
 * <p>This means {@link ElementNameAndTextQualifier
 * ElementNameQualifier} and MultiLevelElementNameQualifier(1) should
 * lead to the same results.</p>
 *
 * <p>Any attribute values are completely ignored.  Only works on
 * elements with exactly one child element at each level.</p>
 *
 * <p>This class mostly exists as an example for custom ElementQualifiers.</p>
 */
public class MultiLevelElementNameAndTextQualifier
    implements ElementQualifier {

    private final ElementSelector es;

    /**
     * Uses element names and the text nested <code>levels</code>
     * child elements deeper into the element to compare elements.
     *
     * <p>Does not ignore empty text nodes.
     * @param levels level of nesting to use when looking up the text
     */
    public MultiLevelElementNameAndTextQualifier(int levels) {
        this(levels, false);
    }

    /**
     * Uses element names and the text nested <code>levels</code>
     * child elements deeper into the element to compare elements.
     *
     * @param levels level of nesting to use when looking up the text
     * @param ignoreEmptyTexts whether whitespace-only textnodes
     * should be ignored.
     */
    public MultiLevelElementNameAndTextQualifier(int levels,
                                                 boolean ignoreEmptyTexts) {
        es = new MultiLevelByNameAndTextSelector(levels, ignoreEmptyTexts);
    }

    public boolean qualifyForComparison(Element control, Element test) {
        return es.canBeCompared(control, test);
    }
}
