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/*   Copyright 2004 The Apache Software Foundation
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.apache.xmlbeans.impl.tool;

import org.apache.xmlbeans.XmlBeans;
import org.apache.xmlbeans.XmlOptions;
import org.apache.xmlbeans.XmlObject;
import org.apache.xmlbeans.SchemaTypeLoader;
import org.apache.xmlbeans.XmlException;

import java.util.Collections;
import java.util.List;
import java.util.ArrayList;
import java.util.Set;
import java.util.HashSet;
import java.util.Collection;
import java.util.Iterator;
import java.io.File;

public class InstanceValidator
{
    public static void printUsage()
    {
        System.out.println("Validates the specified instance against the specified schema.");
        System.out.println("Contrast with the svalidate tool, which validates using a stream.");
        System.out.println("Usage: validate [-dl] [-nopvr] [-noupa] [-license] schema.xsd instance.xml");
        System.out.println("Options:");
        System.out.println("    -dl - permit network downloads for imports and includes (default is off)");
        System.out.println("    -noupa - do not enforce the unique particle attribution rule");
        System.out.println("    -nopvr - do not enforce the particle valid (restriction) rule");
        System.out.println("    -strict - performs strict(er) validation");
        System.out.println("    -partial - allow partial schema type system");
        System.out.println("    -license - prints license information");
    }

    public static void main(String[] args)
    {
        System.exit(extraMain(args));
    }

    /**
     * Use this method to avoid calling {@link java.lang.System#exit(int)}
     * @param args are command line options
     * @return exitCode
     */
    public static int extraMain(String[] args)
    {
        Set flags = new HashSet();
        flags.add("h");
        flags.add("help");
        flags.add("usage");
        flags.add("license");
        flags.add("version");
        flags.add("dl");
        flags.add("noupa");
        flags.add("nopvr");
        flags.add("strict");
        flags.add("partial");

        CommandLine cl = new CommandLine(args, flags, Collections.EMPTY_SET);

        if (cl.getOpt("h") != null || cl.getOpt("help") != null || cl.getOpt("usage") != null || args.length < 1)
        {
            printUsage();
            return 0;
        }

        String[] badopts = cl.getBadOpts();
        if (badopts.length > 0)
        {
            for (int i = 0; i < badopts.length; i++)
                System.out.println("Unrecognized option: " + badopts[i]);
            printUsage();
            return 0;
        }

        if (cl.getOpt("license") != null)
        {
            CommandLine.printLicense();
            return 0;
        }

        if (cl.getOpt("version") != null)
        {
            CommandLine.printVersion();
            return 0;
        }

        if (cl.args().length == 0)
        {
            return 0;
        }

        boolean dl = (cl.getOpt("dl") != null);
        boolean nopvr = (cl.getOpt("nopvr") != null);
        boolean noupa = (cl.getOpt("noupa") != null);
        boolean strict = (cl.getOpt("strict") != null);
        boolean partial = (cl.getOpt("partial") != null);

        File[] schemaFiles = cl.filesEndingWith(".xsd");
        File[] instanceFiles = cl.filesEndingWith(".xml");
        File[] jarFiles = cl.filesEndingWith(".jar");

        List sdocs = new ArrayList();


        for (int i = 0; i < schemaFiles.length; i++)
        {
            try
            {
                sdocs.add(
                    XmlObject.Factory.parse(
                        schemaFiles[i], (new XmlOptions()).setLoadLineNumbers().setLoadMessageDigest()));
            }
            catch (Exception e)
            {
                System.err.println( schemaFiles[i] + " not loadable: " + e );
            }
        }

        XmlObject[] schemas = (XmlObject[])sdocs.toArray(new XmlObject[0]);

        SchemaTypeLoader sLoader = null;
        Collection compErrors = new ArrayList();
        XmlOptions schemaOptions = new XmlOptions();
        schemaOptions.setErrorListener(compErrors);
        if (dl)
            schemaOptions.setCompileDownloadUrls();
        if (nopvr)
            schemaOptions.setCompileNoPvrRule();
        if (noupa)
            schemaOptions.setCompileNoUpaRule();
        if (partial)
            schemaOptions.put("COMPILE_PARTIAL_TYPESYSTEM");

        if (jarFiles != null && jarFiles.length > 0)
            sLoader = XmlBeans.typeLoaderForResource(XmlBeans.resourceLoaderForPath(jarFiles));

        int returnCode = 0;

        try
        {
            if (schemas != null && schemas.length > 0)
                sLoader = XmlBeans.compileXsd(schemas, sLoader, schemaOptions);
        }
        catch (Exception e)
        {
            if (compErrors.isEmpty() || !(e instanceof XmlException))
            {
                e.printStackTrace(System.err);
            }
            System.out.println("Schema invalid:" + (partial ? " couldn't recover from errors" : ""));
            for (Iterator i = compErrors.iterator(); i.hasNext(); )
                System.out.println(i.next());

            returnCode = 10;
            return returnCode;
        }

        // recovered from errors, print out errors
        if (partial && !compErrors.isEmpty())
        {
            returnCode = 11;
            System.out.println("Schema invalid: partial schema type system recovered");
            for (Iterator i = compErrors.iterator(); i.hasNext(); )
                System.out.println(i.next());
        }

        if (sLoader == null)
            sLoader = XmlBeans.getContextTypeLoader();

        for (int i = 0; i < instanceFiles.length; i++)
        {
            XmlObject xobj;

            try
            {
                xobj =
                    sLoader.parse( instanceFiles[i], null, (new XmlOptions()).setLoadLineNumbers(XmlOptions.LOAD_LINE_NUMBERS_END_ELEMENT) );
            }
            catch (Exception e)
            {
                System.err.println(instanceFiles[i] + " not loadable: " + e);
                e.printStackTrace(System.err);
                continue;
            }

            Collection errors = new ArrayList();

            if (xobj.schemaType() == XmlObject.type)
            {
                System.out.println(instanceFiles[i] + " NOT valid.  ");
                System.out.println("  Document type not found." );
            }
            else if (xobj.validate(strict ?
                new XmlOptions().setErrorListener(errors).setValidateStrict() :
                new XmlOptions().setErrorListener(errors)))
                System.out.println(instanceFiles[i] + " valid.");
            else
            {
                returnCode = 1;
                System.out.println(instanceFiles[i] + " NOT valid.");
                for (Iterator it = errors.iterator(); it.hasNext(); )
                {
                    System.out.println(it.next());
                }
            }
        }

        return returnCode;
    }
}