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Data scraping and manipulation utilities for Java

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/*
 *
 */

package org.exparity.data.html;

import static org.apache.commons.lang.StringUtils.*;

import org.apache.commons.lang.StringUtils;

/**
 * The {@link Anchor} class represents a HTML anchor
 *
 * @author Stewart Bissett
 */
public class Anchor {

    private static final String HREF_PROTOCOL_RESOURCE_SEPERATOR = ":";

    private final String href, protocol, resource;

    /**
     * Construct an {@link Anchor} from the href attribute of an HTML anchor tag
     */
    public Anchor(final String href) {
        this.href = href;

        int seperatorPos = StringUtils.indexOf(href, HREF_PROTOCOL_RESOURCE_SEPERATOR);
        if (seperatorPos == StringUtils.INDEX_NOT_FOUND) {
            this.protocol = null;
            this.resource = href;
        } else {
            this.protocol = defaultString(substringBefore(href, HREF_PROTOCOL_RESOURCE_SEPERATOR), null);
            this.resource = removeStart(substringAfter(href, HREF_PROTOCOL_RESOURCE_SEPERATOR), "//");
        }

    }

    /**
     * Test if the protocol matches one of those supplied. If no protocol is defined then false is
     * returned.
     */
    public boolean isProtocol(final String... protocols) {
        if (StringUtils.isNotEmpty(protocol)) {
            for (String protocol : protocols) {
                if (equalsIgnoreCase(this.protocol, protocol)) {
                    return true;
                }
            }
        }
        return false;
    }

    public String getHref() {
        return href;
    }

    public String getProtocol() {
        return protocol;
    }

    public String getResource() {
        return resource;
    }

    @Override
    public String toString() {
        return "Anchor [" + protocol + ":" + resource + "]";
    }
}