/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
 * 
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License. You can obtain
 * a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
 * or glassfish/bootstrap/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 * 
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
 * Contributor(s):
 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */

package com.sun.enterprise.tools.verifier.tests.web;


import com.sun.enterprise.tools.verifier.tests.TagLibTest;
import com.sun.enterprise.tools.verifier.tests.ComponentNameConstructor;
import com.sun.enterprise.tools.verifier.Result;
import com.sun.enterprise.tools.verifier.Context;
import com.sun.enterprise.tools.verifier.TagLibDescriptor;
import com.sun.enterprise.tools.verifier.web.FunctionDescriptor;
import com.sun.enterprise.deployment.WebBundleDescriptor;

/**
 * The function-signature must be specified using a fully-qualified return type
 * followed by the method name, followed by the fully-qualified argument types
 * in parenthesis, separated by commas.
 * 
 * @author Sudipto Ghosh
 */
public class TaglibFunctionSignatureIsValid extends TagLibTest implements WebCheck {
    public Result check(WebBundleDescriptor descriptor) {
        ComponentNameConstructor compName =
                getVerifierContext().getComponentNameConstructor();
        Result result = getInitializedResult();
        Context context = getVerifierContext();
        TagLibDescriptor tlds[] = context.getTagLibDescriptors();
        FunctionDescriptor[] fnDesc = null;

        if (tlds == null) {
            addGoodDetails(result, compName);
            result.passed(smh.getLocalString
                    (getClass().getName() + ".passed",
                            "No tag lib files are specified"));
            return result;
        }

        for (TagLibDescriptor tld : tlds) {
            if (tld.getSpecVersion().compareTo("2.0") >= 0) {
                fnDesc = tld.getFunctionDescriptors();
                if (fnDesc != null)
                    for (FunctionDescriptor fd : fnDesc)
                        checkSignature(result, fd, tld, compName);
            }
        }
        if (result.getStatus() != Result.FAILED) {
            addGoodDetails(result, compName);
            result.passed(smh.getLocalString(getClass()
                    .getName() +
                    ".passed", "function-signature element of the tag lib " +
                    "descriptor are properly defined."));
        }
        return result;
    }

    /**
     * Checks the validity of the signature string contained in function-signature
     * object
     * @param result
     * @param fnDesc
     * @param tld
     * @param compName
     */
    private void checkSignature(Result result, FunctionDescriptor fnDesc,
                                      TagLibDescriptor tld,
                                      ComponentNameConstructor compName) {
        String signature = fnDesc.getFunctionSignature();
        ClassLoader cl = getVerifierContext().getClassLoader();
        String retType = getRetType(signature);
        String[] parameter = getParameters(signature);
        if (checkIfPrimitive(retType) == null && !checkValidRType(retType)) {
            addErrorDetails(result, compName);
            result.failed(smh.getLocalString(getClass().getName() +
                    ".failed",
                    "ERROR: In the tld [ {0} ] return type is not specified correctly in " +
                    "this signature [ {1} ]",
                     new Object[]{tld.getUri(), signature}));
        }
        //parameter is a basic type or fully qualified Type
        if(!checkParamTypeClass(parameter, cl)) {
            addErrorDetails(result, compName);
            result.failed(smh.getLocalString(getClass().getName() +
                    ".failed1",
                    "ERROR: In the tld [ {0} ] parameters are not specified correctly in " +
                    "this signature [ {1} ]",
                     new Object[]{tld.getUri(), signature}));
        }
    }

    /**
     *
     * @param retType
     * @return true if the return type is specified correctly, false otherwise
     */
    private boolean checkValidRType(String retType) {
        boolean valid = true;
        try {
            Class.forName(retType);
        } catch (ClassNotFoundException e) {
             return valid=false;
        }
        return valid;
    }

    /**
     * return true, if all the parameters specified by par String[] are correctly
     * specified, false otherwise.
     * @param par
     * @param cl
     * @return
     */
    private boolean checkParamTypeClass(String[] par, ClassLoader cl) {
        for(String s : par) {
            Class c = checkIfPrimitive(s);
            if (c == null)
                try {
                    c = Class.forName(s, false, cl);
                } catch (ClassNotFoundException e) {
                    return false;
                }
        }
        return true;
    }
}