/*
 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.tools.internal.ws.processor.modeler.annotation;


import com.sun.mirror.declaration.*;
import com.sun.mirror.type.*;
import com.sun.mirror.util.SimpleDeclarationVisitor;
import com.sun.mirror.util.SourcePosition;
import com.sun.tools.internal.ws.processor.model.Port;
import com.sun.tools.internal.ws.processor.modeler.JavaSimpleTypeCreator;
import com.sun.tools.internal.ws.processor.modeler.annotation.AnnotationProcessorContext.SEIContext;
import com.sun.tools.internal.ws.resources.WebserviceapMessages;
import com.sun.tools.internal.ws.util.ClassNameInfo;
import com.sun.tools.internal.ws.wsdl.document.soap.SOAPStyle;
import com.sun.tools.internal.ws.wsdl.document.soap.SOAPUse;
import com.sun.xml.internal.ws.model.RuntimeModeler;
import com.sun.xml.internal.ws.util.localization.Localizable;

import javax.jws.*;
import javax.jws.soap.SOAPBinding;
import javax.jws.soap.SOAPBinding.ParameterStyle;
import java.lang.annotation.Annotation;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import java.util.Stack;

/**
 *
 * @author  WS Development Team
 */
public abstract class WebServiceVisitor extends SimpleDeclarationVisitor implements WebServiceConstants {
    protected ModelBuilder builder;
    protected String wsdlNamespace;
    protected String typeNamespace;
    protected Stack<SOAPBinding> soapBindingStack;
    protected SOAPBinding typeDeclSOAPBinding;
    protected SOAPUse soapUse = SOAPUse.LITERAL;
    protected SOAPStyle soapStyle = SOAPStyle.DOCUMENT;
    protected boolean wrapped = true;
    protected HandlerChain hChain;
    protected Port port;
    protected String serviceImplName;
    protected String endpointInterfaceName;
    protected AnnotationProcessorContext context;
    protected SEIContext seiContext;
    protected boolean processingSEI = false;
    protected String serviceName;
    protected String packageName;
    protected String portName;
    protected boolean endpointReferencesInterface = false;
    protected boolean hasWebMethods = false;
    protected JavaSimpleTypeCreator simpleTypeCreator;
    protected TypeDeclaration typeDecl;
    protected Set<String> processedMethods;
    protected boolean pushedSOAPBinding = false;
    protected static final String ANNOTATION_ELEMENT_ERROR = "webserviceap.endpointinteface.plus.element";



    public WebServiceVisitor(ModelBuilder builder, AnnotationProcessorContext context) {
        this.builder = builder;
        this.context = context;
        this.simpleTypeCreator = new JavaSimpleTypeCreator();
        soapBindingStack = new Stack<SOAPBinding>();
        processedMethods = new HashSet<String>();
    }

    public void visitInterfaceDeclaration(InterfaceDeclaration d) {
        WebService webService = d.getAnnotation(WebService.class);
        if (!shouldProcessWebService(webService, d))
            return;
        if (builder.checkAndSetProcessed(d))
            return;
        typeDecl = d;
        if (endpointInterfaceName != null && !endpointInterfaceName.equals(d.getQualifiedName())) {
            builder.onError(d.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_ENDPOINTINTERFACES_DO_NOT_MATCH(endpointInterfaceName, d.getQualifiedName()));
        }
        verifySEIAnnotations(webService, d);
        endpointInterfaceName = d.getQualifiedName();
        processingSEI = true;
        preProcessWebService(webService, d);
        processWebService(webService, d);
        postProcessWebService(webService, d);
    }

    public void visitClassDeclaration(ClassDeclaration d) {
        WebService webService = d.getAnnotation(WebService.class);
        if (!shouldProcessWebService(webService, d))
            return;
        if (builder.checkAndSetProcessed(d))
            return;
        typeDeclSOAPBinding = d.getAnnotation(SOAPBinding.class);
        typeDecl = d;
        if (serviceImplName == null)
            serviceImplName = d.getQualifiedName();
        String endpointInterfaceName = webService != null ? webService.endpointInterface() : null;
        if (endpointInterfaceName != null && endpointInterfaceName.length() > 0) {
            SourcePosition pos = pos = d.getPosition();
            checkForInvalidImplAnnotation(d, SOAPBinding.class);
            if (webService.name().length() > 0)
                annotationError(pos, WebserviceapMessages.localizableWEBSERVICEAP_ENDPOINTINTEFACE_PLUS_ELEMENT("name"));
            endpointReferencesInterface = true;
            verifyImplAnnotations(d);
            inspectEndpointInterface(endpointInterfaceName, d);
            serviceImplName = null;
            return;
        }
        processingSEI = false;
        preProcessWebService(webService, d);
        processWebService(webService, d);
        serviceImplName = null;
        postProcessWebService(webService, d);
        serviceImplName = null;
    }

    protected void verifySEIAnnotations(WebService webService, InterfaceDeclaration d) {
        if (webService.endpointInterface().length() > 0) {
            builder.onError(d.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_ENDPOINTINTERFACE_ON_INTERFACE(d.getQualifiedName(), webService.endpointInterface()));
        }
        if (webService.serviceName().length() > 0) {
            builder.onError(d.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_INVALID_SEI_ANNOTATION_ELEMENT("serviceName", d.getQualifiedName()));
        }
        if (webService.portName().length() > 0) {
            builder.onError(d.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_INVALID_SEI_ANNOTATION_ELEMENT("portName", d.getQualifiedName()));
        }
    }

    protected void verifyImplAnnotations(ClassDeclaration d) {
        for (MethodDeclaration method : d.getMethods()) {
            checkForInvalidImplAnnotation(method, WebMethod.class);
            checkForInvalidImplAnnotation(method, Oneway.class);
            checkForInvalidImplAnnotation(method, WebResult.class);
            for (ParameterDeclaration param : method.getParameters()) {
                checkForInvalidImplAnnotation(param, WebParam.class);
            }
        }
    }

    protected void checkForInvalidSEIAnnotation(InterfaceDeclaration d, Class annotationClass) {
        Object annotation = d.getAnnotation(annotationClass);
        if (annotation != null) {
            SourcePosition pos = d.getPosition();
            annotationError(pos, WebserviceapMessages.localizableWEBSERVICEAP_INVALID_SEI_ANNOTATION(annotationClass.getName(), d.getQualifiedName()));
        }
    }

    protected void checkForInvalidImplAnnotation(Declaration d, Class annotationClass) {
        Object annotation = d.getAnnotation(annotationClass);
        if (annotation != null) {
            SourcePosition pos = d.getPosition();
            annotationError(pos, WebserviceapMessages.localizableWEBSERVICEAP_ENDPOINTINTEFACE_PLUS_ANNOTATION(annotationClass.getName()));
        }
    }

    protected void annotationError(SourcePosition pos, Localizable message) {
        builder.onError(pos, message);
    }


    protected void preProcessWebService(WebService webService, TypeDeclaration d) {
        processedMethods = new HashSet<String>();
        seiContext = context.getSEIContext(d);
        String targetNamespace = null;
        if (webService != null)
            targetNamespace = webService.targetNamespace();
        if (targetNamespace == null || targetNamespace.length() == 0) {
            String packageName = d.getPackage().getQualifiedName();
            if (packageName == null || packageName.length() == 0) {
                builder.onError(d.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_NO_PACKAGE_CLASS_MUST_HAVE_TARGETNAMESPACE(d.getQualifiedName()));
            }
            targetNamespace = getNamespace(d.getPackage());
        }
        seiContext.setNamespaceURI(targetNamespace);
        if (serviceImplName == null)
            serviceImplName = seiContext.getSEIImplName();
        if (serviceImplName != null) {
            seiContext.setSEIImplName(serviceImplName);
            context.addSEIContext(serviceImplName, seiContext);
        }
        portName = ClassNameInfo.getName(
                d.getSimpleName().replace(
                SIGC_INNERCLASS,
                SIGC_UNDERSCORE));;
                packageName = d.getPackage().getQualifiedName();
                portName = webService != null && webService.name() != null && webService.name().length() >0 ?
                    webService.name() : portName;
                serviceName = ClassNameInfo.getName(d.getQualifiedName())+SERVICE;
                serviceName = webService != null && webService.serviceName() != null &&
                        webService.serviceName().length() > 0 ?
                            webService.serviceName() : serviceName;
                wsdlNamespace = seiContext.getNamespaceURI();
                typeNamespace = wsdlNamespace;

                SOAPBinding soapBinding = d.getAnnotation(SOAPBinding.class);
                if (soapBinding != null) {
                    pushedSOAPBinding = pushSOAPBinding(soapBinding, d, d);
                } else if (d.equals(typeDecl)) {
                    pushedSOAPBinding = pushSOAPBinding(new MySOAPBinding(), d, d);
                }
    }

    public static boolean sameStyle(SOAPBinding.Style style, SOAPStyle soapStyle) {
        if (style.equals(SOAPBinding.Style.DOCUMENT) &&
                soapStyle.equals(SOAPStyle.DOCUMENT))
            return true;
        if (style.equals(SOAPBinding.Style.RPC) &&
                soapStyle.equals(SOAPStyle.RPC))
            return true;
        return false;
    }

    protected boolean pushSOAPBinding(SOAPBinding soapBinding, Declaration bindingDecl,
            TypeDeclaration classDecl) {
        boolean changed = false;
        if (!sameStyle(soapBinding.style(), soapStyle)) {
            changed = true;
            if (pushedSOAPBinding)
                builder.onError(bindingDecl.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_MIXED_BINDING_STYLE(classDecl.getQualifiedName()));
        }
        if (soapBinding.style().equals(SOAPBinding.Style.RPC)) {
            soapStyle = SOAPStyle.RPC;
            wrapped = true;
            if (soapBinding.parameterStyle().equals(ParameterStyle.BARE)) {
                builder.onError(bindingDecl.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_RPC_LITERAL_MUST_NOT_BE_BARE(classDecl.getQualifiedName()));
            }

        } else {
            soapStyle = SOAPStyle.DOCUMENT;
            if (wrapped != soapBinding.parameterStyle().equals(ParameterStyle.WRAPPED)) {
                wrapped = soapBinding.parameterStyle().equals(ParameterStyle.WRAPPED);
                changed = true;
            }
        }
        if (soapBinding.use().equals(SOAPBinding.Use.ENCODED)) {
            String style = "rpc";
            if(soapBinding.style().equals(SOAPBinding.Style.DOCUMENT))
                style = "document";
            builder.onError(bindingDecl.getPosition(), WebserviceapMessages.localizableWEBSERVICE_ENCODED_NOT_SUPPORTED(classDecl.getQualifiedName(), style));
        }
        if (changed || soapBindingStack.empty()) {
            soapBindingStack.push(soapBinding);
            pushedSOAPBinding = true;
        }
        return changed;
    }


    protected SOAPBinding popSOAPBinding() {
        if (pushedSOAPBinding)
            soapBindingStack.pop();
        SOAPBinding soapBinding = null;
        if (!soapBindingStack.empty()) {
            soapBinding = soapBindingStack.peek();
            if (soapBinding.style().equals(SOAPBinding.Style.RPC)) {
                soapStyle = SOAPStyle.RPC;
                wrapped = true;
            } else {
                soapStyle = SOAPStyle.DOCUMENT;
                wrapped = soapBinding.parameterStyle().equals(ParameterStyle.WRAPPED);
            }
        }
        return soapBinding;
    }

    protected String getNamespace(PackageDeclaration packageDecl) {
        return RuntimeModeler.getNamespace(packageDecl.getQualifiedName());
    }

//    abstract protected boolean shouldProcessWebService(WebService webService, InterfaceDeclaration intf);

//    abstract protected boolean shouldProcessWebService(WebService webService, ClassDeclaration decl);
    protected boolean shouldProcessWebService(WebService webService, InterfaceDeclaration intf) {
        hasWebMethods = false;
        if (webService == null)
            builder.onError(intf.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_ENDPOINTINTERFACE_HAS_NO_WEBSERVICE_ANNOTATION(intf.getQualifiedName()));

        SOAPBinding soapBinding = intf.getAnnotation(SOAPBinding.class);
        if(soapBinding != null && soapBinding.style() == SOAPBinding.Style.RPC && soapBinding.parameterStyle() == SOAPBinding.ParameterStyle.BARE) {
            builder.onError(intf.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_INVALID_SOAPBINDING_PARAMETERSTYLE(soapBinding, intf));
            return false;
        }

        if (isLegalSEI(intf))
            return true;
        return false;
    }

    protected boolean shouldProcessWebService(WebService webService, ClassDeclaration classDecl) {
        if (webService == null)
            return false;
        hasWebMethods = hasWebMethods(classDecl);
        SOAPBinding soapBinding = classDecl.getAnnotation(SOAPBinding.class);
                if(soapBinding != null && soapBinding.style() == SOAPBinding.Style.RPC && soapBinding.parameterStyle() == SOAPBinding.ParameterStyle.BARE) {
                  builder.onError(classDecl.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_INVALID_SOAPBINDING_PARAMETERSTYLE(soapBinding, classDecl));
                    return false;
        }
        return isLegalImplementation(webService, classDecl);
    }

    abstract protected void processWebService(WebService webService, TypeDeclaration d);

    protected void postProcessWebService(WebService webService, InterfaceDeclaration d) {
        processMethods(d);
        popSOAPBinding();
    }

    protected void postProcessWebService(WebService webService, ClassDeclaration d) {
        processMethods(d);
        popSOAPBinding();
    }


    protected boolean hasWebMethods(ClassDeclaration d) {
        if (d.getQualifiedName().equals(JAVA_LANG_OBJECT))
            return false;
        WebMethod webMethod;
        for (MethodDeclaration method : d.getMethods()) {
            webMethod = method.getAnnotation(WebMethod.class);
            if (webMethod != null) {
                if (webMethod.exclude()) {
                    if (webMethod.operationName().length() > 0)
                        builder.onError(method.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_INVALID_WEBMETHOD_ELEMENT_WITH_EXCLUDE("operationName", d.getQualifiedName(), method.toString()));
                                if (webMethod.action().length() > 0)
                                    builder.onError(method.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_INVALID_WEBMETHOD_ELEMENT_WITH_EXCLUDE("action", d.getQualifiedName(), method.toString()));
                } else {
                    return true;
                }
            }
        }
        return false;//hasWebMethods(d.getSuperclass().getDeclaration());
    }

    protected void processMethods(InterfaceDeclaration d) {
        builder.log("ProcessedMethods Interface: "+d);
        hasWebMethods = false;
        for (MethodDeclaration methodDecl : d.getMethods()) {
            methodDecl.accept(this);
        }
        for (InterfaceType superType : d.getSuperinterfaces())
            processMethods(superType.getDeclaration());
    }

    protected void processMethods(ClassDeclaration d) {
        builder.log("ProcessedMethods Class: "+d);
        hasWebMethods = hasWebMethods(d);
        if (d.getQualifiedName().equals(JAVA_LANG_OBJECT))
            return;
        if (d.getAnnotation(WebService.class) != null) {
            // Super classes must have @WebService annotations to pick up their methods
            for (MethodDeclaration methodDecl : d.getMethods()) {
                methodDecl.accept(this);
            }
        }
        if (d.getSuperclass() != null) {
            processMethods(d.getSuperclass().getDeclaration());
        }
    }

    private InterfaceDeclaration getEndpointInterfaceDecl(String endpointInterfaceName,
            ClassDeclaration d) {
        InterfaceDeclaration intTypeDecl = null;
        for (InterfaceType interfaceType : d.getSuperinterfaces()) {
            if (endpointInterfaceName.equals(interfaceType.toString())) {
                intTypeDecl = interfaceType.getDeclaration();
                seiContext = context.getSEIContext(intTypeDecl.getQualifiedName());
                assert(seiContext != null);
                seiContext.setImplementsSEI(true);
                break;
            }
        }
        if (intTypeDecl == null) {
            intTypeDecl = (InterfaceDeclaration)builder.getTypeDeclaration(endpointInterfaceName);
        }
        if (intTypeDecl == null)
            builder.onError(WebserviceapMessages.WEBSERVICEAP_ENDPOINTINTERFACE_CLASS_NOT_FOUND(endpointInterfaceName));
        return intTypeDecl;
    }


    private void inspectEndpointInterface(String endpointInterfaceName, ClassDeclaration d) {
        TypeDeclaration intTypeDecl = getEndpointInterfaceDecl(endpointInterfaceName, d);
        if (intTypeDecl != null)
            intTypeDecl.accept(this);
    }

    public void visitMethodDeclaration(MethodDeclaration method) {
        // Methods must be public
        if (!method.getModifiers().contains(Modifier.PUBLIC))
            return;
        if (processedMethod(method))
            return;
        WebMethod webMethod = method.getAnnotation(WebMethod.class);
        if (webMethod != null && webMethod.exclude())
            return;
        SOAPBinding soapBinding = method.getAnnotation(SOAPBinding.class);
        if (soapBinding == null && !method.getDeclaringType().equals(typeDecl)) {
            if (method.getDeclaringType() instanceof ClassDeclaration) {
                soapBinding = method.getDeclaringType().getAnnotation(SOAPBinding.class);
                if (soapBinding != null)
                    builder.log("using "+method.getDeclaringType()+"'s SOAPBinding.");
                else {
                    soapBinding = new MySOAPBinding();
                }
            }
        }
        boolean newBinding = false;
        if (soapBinding != null) {
            newBinding = pushSOAPBinding(soapBinding, method, typeDecl);
        }
        try {
            if (shouldProcessMethod(method, webMethod)) {
                processMethod(method, webMethod);
            }
        } finally {
            if (newBinding) {
                popSOAPBinding();
            }
        }
    }

    protected boolean processedMethod(MethodDeclaration method) {
        String id = method.toString();
        if (processedMethods.contains(id))
            return true;
        processedMethods.add(id);
        return false;
    }


    protected boolean shouldProcessMethod(MethodDeclaration method, WebMethod webMethod) {
        builder.log("should process method: "+method.getSimpleName()+" hasWebMethods: "+ hasWebMethods+" ");
        /*
        Fix for https://jax-ws.dev.java.net/issues/show_bug.cgi?id=577
        if (hasWebMethods && webMethod == null) {
            builder.log("webMethod == null");
            return false;
        }
        */
        Collection<Modifier> modifiers = method.getModifiers();
        boolean staticFinal = modifiers.contains(Modifier.STATIC) || modifiers.contains(Modifier.FINAL);
        if (staticFinal) {
            if (webMethod != null) {
                builder.onError(method.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_WEBSERVICE_METHOD_IS_STATIC_OR_FINAL(method.getDeclaringType(), method));
            }
            return false;
        }
        boolean retval = (endpointReferencesInterface ||
                method.getDeclaringType().equals(typeDecl) ||
                (method.getDeclaringType().getAnnotation(WebService.class) != null));
        builder.log("endpointReferencesInterface: "+endpointReferencesInterface);
        builder.log("declaring class has WebSevice: "+(method.getDeclaringType().getAnnotation(WebService.class) != null));
        builder.log("returning: "+retval);
        return  retval;
    }

    abstract protected void processMethod(MethodDeclaration method, WebMethod webMethod);


    protected boolean isLegalImplementation(WebService webService, ClassDeclaration classDecl) {

        boolean isStateful = isStateful(classDecl);

        Collection<Modifier> modifiers = classDecl.getModifiers();
        if (!modifiers.contains(Modifier.PUBLIC)){
            builder.onError(classDecl.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_WEBSERVICE_CLASS_NOT_PUBLIC(classDecl.getQualifiedName()));
                    return false;
        }
        if (modifiers.contains(Modifier.FINAL) && !isStateful) {
            builder.onError(classDecl.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_WEBSERVICE_CLASS_IS_FINAL(classDecl.getQualifiedName()));
            return false;
        }
        if (modifiers.contains(Modifier.ABSTRACT) && !isStateful) {
            builder.onError(classDecl.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_WEBSERVICE_CLASS_IS_ABSTRACT(classDecl.getQualifiedName()));
            return false;
        }
        boolean hasDefaultConstructor = false;
        for (ConstructorDeclaration constructor : classDecl.getConstructors()) {
            if (constructor.getModifiers().contains(Modifier.PUBLIC) &&
                    constructor.getParameters().size() == 0) {
                hasDefaultConstructor = true;
                break;
            }
        }
        if (!hasDefaultConstructor && !isStateful) {
            if (classDecl.getDeclaringType() != null && !modifiers.contains(Modifier.STATIC)) {
                builder.onError(classDecl.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_WEBSERVICE_CLASS_IS_INNERCLASS_NOT_STATIC(classDecl.getQualifiedName()));
                return false;
            }

            builder.onError(classDecl.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_WEBSERVICE_NO_DEFAULT_CONSTRUCTOR(classDecl.getQualifiedName()));
            return false;
        }
        if (webService.endpointInterface().length() == 0) {
            if (!methodsAreLegal(classDecl))
                return false;
        } else {
            InterfaceDeclaration intfDecl = getEndpointInterfaceDecl(webService.endpointInterface(), classDecl);
            if (!classImplementsSEI(classDecl, intfDecl))
                return false;
        }

        return true;
    }

    private boolean isStateful(ClassDeclaration classDecl){
        try {
            // We don't want dependency on rt-ha module as its not integrated in JDK
            return classDecl.getAnnotation((Class <? extends Annotation>)Class.forName("com.sun.xml.internal.ws.developer.Stateful"))!=null;
        } catch (ClassNotFoundException e) {
            //ignore
        }
        return false;
    }

    protected boolean classImplementsSEI(ClassDeclaration classDecl,
            InterfaceDeclaration intfDecl) {
        for (InterfaceType interfaceType : classDecl.getSuperinterfaces()) {
            if (interfaceType.getDeclaration().equals(intfDecl))
                return true;
        }
        boolean implementsMethod;
        for (MethodDeclaration method : intfDecl.getMethods()) {
            implementsMethod = false;
            for (MethodDeclaration classMethod : classDecl.getMethods()) {
                if (sameMethod(method, classMethod)) {
                    implementsMethod = true;
                    break;
                }
            }
            if (!implementsMethod) {
                builder.onError(method.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_METHOD_NOT_IMPLEMENTED(intfDecl.getSimpleName(), classDecl.getSimpleName(), method));
                return false;
            }
        }
        return true;
    }

    protected boolean sameMethod(MethodDeclaration method1, MethodDeclaration method2) {
        if (!method1.getSimpleName().equals(method2.getSimpleName()))
            return false;
        if (!method1.getReturnType().equals(method2.getReturnType()))
            return false;
        ParameterDeclaration[] params1 = method1.getParameters().toArray(new ParameterDeclaration[0]);
        ParameterDeclaration[] params2 = method2.getParameters().toArray(new ParameterDeclaration[0]);
        if (params1.length != params2.length)
            return false;
        int pos = 0;
        for (ParameterDeclaration param1 : method1.getParameters()) {
            if (!param1.getType().equals(params2[pos++].getType()))
                return false;
        }
        return true;
    }

    protected boolean isLegalSEI(InterfaceDeclaration intf) {
        for (FieldDeclaration field : intf.getFields())
            if (field.getConstantValue() != null) {
                builder.onError(WebserviceapMessages.WEBSERVICEAP_SEI_CANNOT_CONTAIN_CONSTANT_VALUES(intf.getQualifiedName(), field.getSimpleName()));
                return false;
            }
        if (!methodsAreLegal(intf))
            return false;
        return true;
    }

    protected boolean methodsAreLegal(InterfaceDeclaration intfDecl) {
        hasWebMethods = false;
        for (MethodDeclaration method : intfDecl.getMethods()) {
            if (!isLegalMethod(method, intfDecl))
                return false;
        }
        for (InterfaceType superIntf : intfDecl.getSuperinterfaces()) {
            if (!methodsAreLegal(superIntf.getDeclaration()))
                return false;
        }
        return true;
    }

    protected boolean methodsAreLegal(ClassDeclaration classDecl) {
        hasWebMethods = hasWebMethods(classDecl);
        for (MethodDeclaration method : classDecl.getMethods()) {
            if (!isLegalMethod(method, classDecl))
                return false;
        }
        ClassType superClass = classDecl.getSuperclass();

        if (!superClass.getDeclaration().getQualifiedName().equals(JAVA_LANG_OBJECT) && !methodsAreLegal(superClass.getDeclaration())) {
            return false;
        }
        return true;
    }


    protected boolean isLegalMethod(MethodDeclaration method, TypeDeclaration typeDecl) {
        WebMethod webMethod = method.getAnnotation(WebMethod.class);
        //SEI cannot have methods with @WebMethod(exclude=true)
        if (typeDecl instanceof InterfaceDeclaration && webMethod != null && webMethod.exclude())
            builder.onError(method.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_INVALID_SEI_ANNOTATION_ELEMENT_EXCLUDE("exclude=true", typeDecl.getQualifiedName(), method.toString()));
        // With https://jax-ws.dev.java.net/issues/show_bug.cgi?id=577, hasWebMethods has no effect
        // if (hasWebMethods && (webMethod == null))
        // return true;

        if ((webMethod !=null) && webMethod.exclude()) {
            return true;
        }
        /*
        This check is not needed as Impl class is already checked that it is not abstract.
        if (typeDecl instanceof ClassDeclaration && method.getModifiers().contains(Modifier.ABSTRACT)) {
            builder.onError(method.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_WEBSERVICE_METHOD_IS_ABSTRACT(typeDecl.getQualifiedName(), method.getSimpleName()));
            return false;
        }
        */
        if (!isLegalType(method.getReturnType())) {
            builder.onError(method.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_METHOD_RETURN_TYPE_CANNOT_IMPLEMENT_REMOTE(typeDecl.getQualifiedName(),
                method.getSimpleName(),
                method.getReturnType()));
        }
        boolean isOneway = method.getAnnotation(Oneway.class) != null;
        if (isOneway && !isValidOnewayMethod(method, typeDecl))
            return false;


        SOAPBinding soapBinding = method.getAnnotation(SOAPBinding.class);
        if (soapBinding != null) {
            if (soapBinding.style().equals(SOAPBinding.Style.RPC)) {
                builder.onError(method.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_RPC_SOAPBINDING_NOT_ALLOWED_ON_METHOD(typeDecl.getQualifiedName(), method.toString()));
            }
        }

        int paramIndex = 0;
        for (ParameterDeclaration parameter : method.getParameters()) {
            if (!isLegalParameter(parameter, method, typeDecl, paramIndex++))
                return false;
        }

        if (!isDocLitWrapped() &&
                soapStyle.equals(SOAPStyle.DOCUMENT)) {
            ParameterDeclaration outParam = getOutParameter(method);
            int inParams = getModeParameterCount(method, WebParam.Mode.IN);
            int outParams = getModeParameterCount(method, WebParam.Mode.OUT);
            if (inParams != 1) {
                builder.onError(method.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_DOC_BARE_AND_NO_ONE_IN(typeDecl.getQualifiedName(), method.toString()));
            }
            if (method.getReturnType() instanceof VoidType) {
                if (outParam == null && !isOneway) {
                    builder.onError(method.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_DOC_BARE_NO_OUT(typeDecl.getQualifiedName(), method.toString()));
                }
                if (outParams != 1) {
                    if (!isOneway && outParams != 0)
                        builder.onError(method.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_DOC_BARE_NO_RETURN_AND_NO_OUT(typeDecl.getQualifiedName(), method.toString()));
                }
            } else {
                if (outParams > 0) {
                    builder.onError(outParam.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_DOC_BARE_RETURN_AND_OUT(typeDecl.getQualifiedName(), method.toString()));
                }
            }
        }
        return true;
    }

    protected boolean isLegalParameter(ParameterDeclaration param,
            MethodDeclaration method,
            TypeDeclaration typeDecl,
            int paramIndex) {
        if (!isLegalType(param.getType())) {
            builder.onError(param.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_METHOD_PARAMETER_TYPES_CANNOT_IMPLEMENT_REMOTE(typeDecl.getQualifiedName(),
                method.getSimpleName(),
                param.getSimpleName(),
                param.getType().toString()));
            return false;
        }
        TypeMirror holderType;
        holderType = builder.getHolderValueType(param.getType());
        WebParam webParam = param.getAnnotation(WebParam.class);
        WebParam.Mode mode = null;
        if (webParam != null)
            mode = webParam.mode();

        if (holderType != null) {
            if (mode != null &&  mode==WebParam.Mode.IN)
                builder.onError(param.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_HOLDER_PARAMETERS_MUST_NOT_BE_IN_ONLY(typeDecl.getQualifiedName(), method.toString(), paramIndex));
        } else if (mode != null && mode!=WebParam.Mode.IN) {
            builder.onError(param.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_NON_IN_PARAMETERS_MUST_BE_HOLDER(typeDecl.getQualifiedName(), method.toString(), paramIndex));
        }



        return true;
    }

    protected boolean isDocLitWrapped() {
        return soapStyle.equals(SOAPStyle.DOCUMENT) && wrapped;
    }

    protected boolean isValidOnewayMethod(MethodDeclaration method, TypeDeclaration typeDecl) {
        boolean valid = true;
        if (!(method.getReturnType() instanceof VoidType)) {
            // this is an error, cannot be Oneway and have a return type
            builder.onError(method.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_ONEWAY_OPERATION_CANNOT_HAVE_RETURN_TYPE(typeDecl.getQualifiedName(), method.toString()));
            valid = false;
        }
        ParameterDeclaration outParam = getOutParameter(method);
        if (outParam != null) {
            builder.onError(outParam.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_ONEWAY_AND_OUT(typeDecl.getQualifiedName(), method.toString()));
            valid = false;
        }
        if (!isDocLitWrapped() && soapStyle.equals(SOAPStyle.DOCUMENT)) {
            int inCnt = getModeParameterCount(method, WebParam.Mode.IN);
            if (inCnt != 1) {
                builder.onError(method.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_ONEWAY_AND_NOT_ONE_IN(typeDecl.getQualifiedName(), method.toString()));
                valid = false;
            }
        }
        ClassDeclaration exDecl;
        for (ReferenceType thrownType : method.getThrownTypes()) {
            exDecl = ((ClassType)thrownType).getDeclaration();
            if (builder.isServiceException(exDecl)) {
                builder.onError(method.getPosition(), WebserviceapMessages.localizableWEBSERVICEAP_ONEWAY_OPERATION_CANNOT_DECLARE_EXCEPTIONS(typeDecl.getQualifiedName(), method.toString(), exDecl.getQualifiedName()));
                valid = false;
            }
        }
        return valid;
    }

    protected int getModeParameterCount(MethodDeclaration method, WebParam.Mode mode) {
        WebParam webParam;
        int cnt = 0;
        for (ParameterDeclaration param : method.getParameters()) {
            webParam = param.getAnnotation(WebParam.class);
            if (webParam != null) {
                if (webParam.header())
                    continue;
                if (isEquivalentModes(mode, webParam.mode()))
                    cnt++;
            } else {
                if (isEquivalentModes(mode, WebParam.Mode.IN)) {
                    cnt++;
                }
            }
        }
        return cnt;
    }

    protected boolean isEquivalentModes(WebParam.Mode mode1, WebParam.Mode mode2) {
        if (mode1.equals(mode2))
            return true;
        assert mode1==WebParam.Mode.IN || mode1==WebParam.Mode.OUT;
        if (mode1==WebParam.Mode.IN && mode2!=WebParam.Mode.OUT)
            return true;
        if (mode1==WebParam.Mode.OUT && mode2!=WebParam.Mode.IN)
            return true;
        return false;
    }

    protected boolean isHolder(ParameterDeclaration param) {
        return builder.getHolderValueType(param.getType()) != null;
    }

    protected boolean isLegalType(TypeMirror type) {
        if (!(type instanceof DeclaredType))
            return true;
        TypeDeclaration typeDecl = ((DeclaredType)type).getDeclaration();
        if(typeDecl == null) {
            // can be null, if this type's declaration is unknown. This may be the result of a processing error, such as a missing class file.
            builder.onError(WebserviceapMessages.WEBSERVICEAP_COULD_NOT_FIND_TYPEDECL(type.toString(), context.getRound()));
        }
        return !builder.isRemote(typeDecl);
    }

    protected ParameterDeclaration getOutParameter(MethodDeclaration method) {
        WebParam webParam;
        for (ParameterDeclaration param : method.getParameters()) {
            webParam = param.getAnnotation(WebParam.class);
            if (webParam != null && webParam.mode()!=WebParam.Mode.IN) {
                return param;
            }
        }
        return null;
    }

    protected static class MySOAPBinding implements SOAPBinding {
        public Style style() {return SOAPBinding.Style.DOCUMENT;}
        public Use use() {return SOAPBinding.Use.LITERAL; }
        public ParameterStyle parameterStyle() { return SOAPBinding.ParameterStyle.WRAPPED;}
        public Class<? extends java.lang.annotation.Annotation> annotationType() {
            return SOAPBinding.class;
        }
    }
}
