ohair@286: /*
mkos@397:  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
ohair@286:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
ohair@286:  *
ohair@286:  * This code is free software; you can redistribute it and/or modify it
ohair@286:  * under the terms of the GNU General Public License version 2 only, as
ohair@286:  * published by the Free Software Foundation.  Oracle designates this
ohair@286:  * particular file as subject to the "Classpath" exception as provided
ohair@286:  * by Oracle in the LICENSE file that accompanied this code.
ohair@286:  *
ohair@286:  * This code is distributed in the hope that it will be useful, but WITHOUT
ohair@286:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
ohair@286:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
ohair@286:  * version 2 for more details (a copy is included in the LICENSE file that
ohair@286:  * accompanied this code).
ohair@286:  *
ohair@286:  * You should have received a copy of the GNU General Public License version
ohair@286:  * 2 along with this work; if not, write to the Free Software Foundation,
ohair@286:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
ohair@286:  *
ohair@286:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
ohair@286:  * or visit www.oracle.com if you need additional information or have any
ohair@286:  * questions.
ohair@286:  */
ohair@286: 
ohair@286: package com.sun.tools.internal.xjc;
ohair@286: 
ohair@286: import java.net.URL;
ohair@286: 
ohair@286: import javax.xml.validation.Schema;
ohair@286: import javax.xml.validation.SchemaFactory;
ohair@286: import javax.xml.validation.ValidatorHandler;
ohair@286: 
alanb@368: import com.sun.xml.internal.bind.v2.util.XmlFactory;
alanb@368: import javax.xml.XMLConstants;
ohair@286: import org.xml.sax.SAXException;
ohair@286: 
mkos@408: import static com.sun.xml.internal.bind.v2.util.XmlFactory.allowExternalAccess;
mkos@397: 
ohair@286: /**
ohair@286:  * Wraps a JAXP {@link Schema} object and lazily instantiate it.
ohair@286:  *
ohair@286:  * This object is thread-safe. There should be only one instance of
ohair@286:  * this for the whole VM.
ohair@286:  *
ohair@286:  * @author Kohsuke Kawaguchi
ohair@286:  */
ohair@286: public final class SchemaCache {
ohair@286: 
ohair@286:     private Schema schema;
ohair@286: 
ohair@286:     private final URL source;
ohair@286: 
ohair@286:     public SchemaCache(URL source) {
ohair@286:         this.source = source;
ohair@286:     }
ohair@286: 
ohair@286:     public ValidatorHandler newValidator() {
ohair@286:         synchronized(this) {
ohair@286:             if(schema==null) {
ohair@286:                 try {
alanb@368:                     // do not disable secure processing - these are well-known schemas
alanb@368:                     SchemaFactory sf = XmlFactory.createSchemaFactory(XMLConstants.W3C_XML_SCHEMA_NS_URI, false);
mkos@408:                     schema = allowExternalAccess(sf, "file", false).newSchema(source);
ohair@286:                 } catch (SAXException e) {
ohair@286:                     // we make sure that the schema is correct before we ship.
ohair@286:                     throw new AssertionError(e);
ohair@286:                 }
ohair@286:             }
ohair@286:         }
ohair@286: 
ohair@286:         ValidatorHandler handler = schema.newValidatorHandler();
ohair@286:         return handler;
ohair@286:     }
ohair@286: 
ohair@286: }