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/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Distribution License v. 1.0, which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: BSD-3-Clause
 */

package com.sun.xml.ws.wsdl.parser;


import com.sun.xml.ws.api.model.wsdl.editable.*;
import com.sun.xml.ws.api.wsdl.parser.WSDLParserExtension;

import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamConstants;
import javax.xml.stream.XMLStreamReader;

/**
 * {@link WSDLParserExtension} filter that checks if
 * another {@link WSDLParserExtension} is following the contract.
 *
 * 
 * This code protects the JAX-WS RI from broken extensions.
 *
 * 
 * For now it just checks if {@link XMLStreamReader} is placed
 * at the expected start/end element.
 *
 * @author Kohsuke Kawaguchi
 */
final class FoolProofParserExtension extends DelegatingParserExtension {

    public FoolProofParserExtension(WSDLParserExtension core) {
        super(core);
    }

    private QName pre(XMLStreamReader xsr) {
        return xsr.getName();
    }

    private boolean post(QName tagName, XMLStreamReader xsr, boolean result) {
        if(!tagName.equals(xsr.getName()))
            return foundFool();
        if(result) {
            if(xsr.getEventType()!=XMLStreamConstants.END_ELEMENT)
                foundFool();
        } else {
            if(xsr.getEventType()!=XMLStreamConstants.START_ELEMENT)
                foundFool();
        }
        return result;
    }

    private boolean foundFool() {
        throw new AssertionError("XMLStreamReader is placed at the wrong place after invoking "+core);
    }

    public boolean serviceElements(EditableWSDLService service, XMLStreamReader reader) {
        return post(pre(reader),reader,super.serviceElements(service, reader));
    }

    public boolean portElements(EditableWSDLPort port, XMLStreamReader reader) {
        return post(pre(reader),reader,super.portElements(port, reader));
    }

    public boolean definitionsElements(XMLStreamReader reader) {
        return post(pre(reader),reader,super.definitionsElements(reader));
    }

    public boolean bindingElements(EditableWSDLBoundPortType binding, XMLStreamReader reader) {
        return post(pre(reader),reader,super.bindingElements(binding, reader));
    }

    public boolean portTypeElements(EditableWSDLPortType portType, XMLStreamReader reader) {
        return post(pre(reader),reader,super.portTypeElements(portType, reader));
    }

    public boolean portTypeOperationElements(EditableWSDLOperation operation, XMLStreamReader reader) {
        return post(pre(reader),reader,super.portTypeOperationElements(operation, reader));
    }

    public boolean bindingOperationElements(EditableWSDLBoundOperation operation, XMLStreamReader reader) {
        return post(pre(reader),reader,super.bindingOperationElements(operation, reader));
    }

    public boolean messageElements(EditableWSDLMessage msg, XMLStreamReader reader) {
        return post(pre(reader),reader,super.messageElements(msg, reader));
    }

    public boolean portTypeOperationInputElements(EditableWSDLInput input, XMLStreamReader reader) {
        return post(pre(reader),reader,super.portTypeOperationInputElements(input, reader));
    }

    public boolean portTypeOperationOutputElements(EditableWSDLOutput output, XMLStreamReader reader) {
        return post(pre(reader),reader,super.portTypeOperationOutputElements(output, reader));
    }

    public boolean portTypeOperationFaultElements(EditableWSDLFault fault, XMLStreamReader reader) {
        return post(pre(reader),reader,super.portTypeOperationFaultElements(fault, reader));
    }

    public boolean bindingOperationInputElements(EditableWSDLBoundOperation operation, XMLStreamReader reader) {
        return super.bindingOperationInputElements(operation, reader);
    }

    public boolean bindingOperationOutputElements(EditableWSDLBoundOperation operation, XMLStreamReader reader) {
        return post(pre(reader),reader,super.bindingOperationOutputElements(operation, reader));
    }

    public boolean bindingOperationFaultElements(EditableWSDLBoundFault fault, XMLStreamReader reader) {
        return post(pre(reader),reader,super.bindingOperationFaultElements(fault, reader));
    }
}