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Open source Reference Implementation of JSR-224: Java API for XML Web Services
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package com.sun.tools.ws.wsdl.parser;

import com.sun.tools.ws.api.wsdl.TWSDLExtensible;
import com.sun.tools.ws.api.wsdl.TWSDLExtensionHandler;
import com.sun.tools.ws.api.wsdl.TWSDLParserContext;
import com.sun.tools.ws.wsdl.document.mime.MIMEConstants;
import org.w3c.dom.Element;

import java.util.Collections;
import java.util.Map;

/**
 * An abstract implementation class of {@link TWSDLExtensionHandler}
 *
 * @author Vivek Pandey
 */
public abstract class AbstractExtensionHandler extends TWSDLExtensionHandler {
    private final Map extensionHandlers;
    private final Map unmodExtenHandlers;

    public AbstractExtensionHandler(Map extensionHandlerMap) {
        this.extensionHandlers = extensionHandlerMap;
        this.unmodExtenHandlers = Collections.unmodifiableMap(extensionHandlers);
    }

    public Map getExtensionHandlers(){
        return unmodExtenHandlers;
    }

    /**
     * Callback that gets called by the WSDL parser or any other extension handler on finding an extensibility element
     * that it can't understand.
     *
     * @param parent  The Parent element within which the extensibility element is defined
     * @param e       The extensibility elemenet
     * @return false if there was some error during the extension handling otherwise returns true. If returned false
     *         then the WSDL parser can abort if the wsdl extensibility element had required attribute set to true
     */
    public boolean doHandleExtension(TWSDLParserContext context, TWSDLExtensible parent, Element e) {
        if (parent.getWSDLElementName().equals(MIMEConstants.QNAME_PART)) {
            return handleMIMEPartExtension(context, parent, e);
        } else {
            return super.doHandleExtension(context, parent, e);
        }
    }

    /**
     * Callback for wsdl:mime
     *
     * @param context Parser context that will be passed on by the wsdl parser
     * @param parent  The Parent element within which the extensibility element is defined
     * @param e       The extensibility elemenet
     * @return false if there was some error during the extension handling otherwise returns true. If returned false
     *         then the WSDL parser can abort if the wsdl extensibility element had required attribute set to true
     */
    protected boolean handleMIMEPartExtension(TWSDLParserContext context, TWSDLExtensible parent, Element e){
        return false;
    }
}