org.eclipse.persistence.sdo.helper.DefaultSchemaResolver Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of eclipselink Show documentation
EclipseLink build based upon Git transaction f2b9fc5
There is a newer version: 5.0.0-B03
/*
 * Copyright (c) 1998, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// Contributors:
//     Oracle - initial API and implementation from Oracle TopLink
package org.eclipse.persistence.sdo.helper;

import java.net.URI;
import java.net.URL;

import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;

import org.eclipse.persistence.logging.AbstractSessionLog;
import org.xml.sax.InputSource;

/**
 * Purpose: Default implementation of the org.eclipse.persistence.sdo.helper.SchemaResolver interface
 * 
Responsibilities:

 *  Given the source schema and namespace and schemaLocation values from an import or include return the referenced Schema
 * 
 If a baseSchemaLocation is set it will be prepended to all schemaLocations passed into the resovleSchema methods
 * 
 This implementation will try to open an Inputstream to a URL created from the schemaLocation and return a StreamSource based on that inputstream
 * 
 *
 * @see org.eclipse.persistence.sdo.helper.SchemaResolver
 */
public class DefaultSchemaResolver implements SchemaResolver {
    private String baseSchemaLocation;

    public DefaultSchemaResolver() {
    }

    /**
     * Given the source schema and namespace and schemaLocation values from an import
     * or include return the referenced Schema.
     *
     * @param sourceXSD The Source object of the source schema
     * @param namespace The namespace portion of the import/include
     * @param schemaLocation The schemaLocation portion of the import/include
     * @return Source for the referenced Schema or null if processing the referenced
     * schema should be skipped
     */
    @Override
    public Source resolveSchema(Source sourceXSD, String namespace, String schemaLocation) {
        try {
            URL schemaUrl = null;
            String baseLoc = getBaseSchemaLocation();
            if (baseLoc == null) {
                // No base location, use schema location

                URI schemaUri = new URI(schemaLocation);
                if(!(schemaUri.isAbsolute()) && sourceXSD.getSystemId() != null) {
                    baseLoc = sourceXSD.getSystemId();
                    schemaUrl = new URI(baseLoc).resolve(schemaUri).toURL();
                } else {
                    // No base location, use schema location
                    schemaUrl = new URI(schemaLocation).toURL();
                }
            } else {
                // May need to resolve against the base location
                URI schemaUri = new URI(schemaLocation);
                // If the schema location is absolute, ignore base location
                if (schemaUri.isAbsolute()) {
                    schemaUrl = schemaUri.toURL();
                } else {
                    // Attempt to resolve the schema location against the base location
                    URI baseUri = new URI(baseLoc);
                    // Handle 'jar:' case - we will need to try and create the schema URL manually
                    if (baseUri.isOpaque() && baseUri.getScheme().equals("jar")) {
                        // Example - jar:file:/C:/schema.jar!/my.xsd
                        // Strip off anything after the last '/' character (base location could represent a file)
                        schemaUrl = new URI(baseLoc.substring(0, baseLoc.lastIndexOf('/') + 1) + schemaLocation).toURL();
                    } else {
                        schemaUrl = new URI(baseLoc).resolve(schemaUri).toURL();
                    }
                }
            }
            return new StreamSource(schemaUrl.toExternalForm());
        } catch (Exception e) {
            AbstractSessionLog.getLog().log(AbstractSessionLog.WARNING, "sdo_error_processing_referenced_schema", new Object[] { e.getClass().getName(), namespace, schemaLocation });
            AbstractSessionLog.getLog().logThrowable(AbstractSessionLog.FINEST, e);
        }
        return null;
    }

    /**
     * Satisfy EntityResolver interface implementation.
     * Allow resolution of external entities.
     *
     * @param publicId
     * @param systemId
     * @return null
     */
    @Override
    public InputSource resolveEntity(String publicId, String systemId) {
        return null;
    }

    /**
    * Optional baseSchemaLocation can be specified
    * If set, all schemaLocations passed into the resolveSchema methods will be resolved
    * against this base location according to the java.net.URI API
    *
    * @param baseSchemaLocation optional baseSchemaLocation
    */
    public void setBaseSchemaLocation(String baseSchemaLocation) {
        this.baseSchemaLocation = baseSchemaLocation;
    }

    public String getBaseSchemaLocation() {
        return baseSchemaLocation;
    }
}