net.sf.okapi.lib.verification.ValidateXliffSchema Maven / Gradle / Ivy

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/*===========================================================================
  Copyright (C) 2012 by the Okapi Framework contributors
-----------------------------------------------------------------------------
  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 net.sf.okapi.lib.verification;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;

import javax.xml.XMLConstants;
import javax.xml.transform.stream.StreamSource;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;
import javax.xml.validation.Validator;

import net.sf.okapi.common.exceptions.OkapiIOException;

import org.w3c.dom.DOMImplementation;
import org.w3c.dom.bootstrap.DOMImplementationRegistry;
import org.w3c.dom.ls.DOMImplementationLS;
import org.w3c.dom.ls.LSInput;
import org.w3c.dom.ls.LSResourceResolver;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;

class JarLSResourceResolver implements LSResourceResolver {

    @Override
    public LSInput resolveResource(String type, String namespaceURI, String publicId, String systemId, String baseURI) {
        LSInput result = null;
        try {
            String featureName = "XML 1.0";
            DOMImplementationRegistry registry = DOMImplementationRegistry.newInstance();
            DOMImplementation impl = registry.getDOMImplementation(featureName);
            DOMImplementationLS ls = (DOMImplementationLS) impl;

            result = ls.createLSInput();
            InputStream is = JarLSResourceResolver.class.getResourceAsStream("xml.xsd");
            result.setByteStream(is);
        } catch (ClassNotFoundException | IllegalAccessException | InstantiationException ex) {
        }
        if (result == null)
            throw new OkapiIOException("XLIFF Validation : internal DOM error, cannot load xml.xsd");

        return result;
    }
}

public class ValidateXliffSchema {
    private final static String xliffSchema = "xliff-core-1.2-transitional.xsd";
    private static Validator    validator;

    static {
        try {
            InputStream is = ValidateXliffSchema.class.getResourceAsStream(xliffSchema);

            SchemaFactory factory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
            // my own resolver to load xml.xsd from a jar
            LSResourceResolver jarResolver = new JarLSResourceResolver();
            factory.setResourceResolver(jarResolver);

            Schema schema = factory.newSchema(new StreamSource(is));
            validator = schema.newValidator();
        } catch (SAXException ex) {
        }
        if (validator == null)
            throw new OkapiIOException("XLIFF Schame Validation : internal error, invalid " + xliffSchema);
    }

    public static boolean validateXliffSchema(InputStream inStream) {
        if (validator == null)
            return true;
        try {
            validator.validate(new StreamSource(inStream));
            return true;
        } catch (SAXParseException ex) {
            String message = ex.getMessage();
            if (!message.startsWith("Duplicate key value [")
                    || !message.endsWith("] declared for identity constraint of element \"file\".")) {
                String errorString = String.format("XLIFF Validation Error [%d, %d]:\n  %s\n  %s", ex.getLineNumber(),
                        ex.getColumnNumber(), ex.getSystemId(), ex.getMessage());
                throw new OkapiIOException(errorString);
            }
        } catch (Exception ex) {
            throw new OkapiIOException("XLIFF Validation Error: " + ex.getMessage());
        }
        return false;
    }

    public static boolean validateXliffSchema(URI fileURI) {
        try (InputStream inStream = new FileInputStream(new File(fileURI))) {
            return validateXliffSchema(inStream);
        } catch (IOException ex) {
            // The old API did not throw IOException, so we catch and rethrow the same exception as before
            throw new OkapiIOException("XLIFF Validation Error: " + ex.getMessage());
        }
    }
}