aoqi@0: /*
aoqi@0:  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.  Oracle designates this
aoqi@0:  * particular file as subject to the "Classpath" exception as provided
aoqi@0:  * by Oracle in the LICENSE file that accompanied this code.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: package com.sun.tools.internal.xjc;
aoqi@0: 
aoqi@0: import java.net.URL;
aoqi@0: 
aoqi@0: import javax.xml.validation.Schema;
aoqi@0: import javax.xml.validation.SchemaFactory;
aoqi@0: import javax.xml.validation.ValidatorHandler;
aoqi@0: 
aoqi@0: import com.sun.xml.internal.bind.v2.util.XmlFactory;
aoqi@0: import javax.xml.XMLConstants;
aoqi@0: import org.xml.sax.SAXException;
aoqi@0: 
aoqi@0: import static com.sun.xml.internal.bind.v2.util.XmlFactory.allowExternalAccess;
aoqi@0: 
aoqi@0: /**
aoqi@0:  * Wraps a JAXP {@link Schema} object and lazily instantiate it.
aoqi@0:  *
aoqi@0:  * This object is thread-safe. There should be only one instance of
aoqi@0:  * this for the whole VM.
aoqi@0:  *
aoqi@0:  * @author Kohsuke Kawaguchi
aoqi@0:  */
aoqi@0: public final class SchemaCache {
aoqi@0: 
aoqi@0:     private Schema schema;
aoqi@0: 
aoqi@0:     private final URL source;
aoqi@0: 
aoqi@0:     public SchemaCache(URL source) {
aoqi@0:         this.source = source;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public ValidatorHandler newValidator() {
aoqi@0:         synchronized(this) {
aoqi@0:             if(schema==null) {
aoqi@0:                 try {
aoqi@0:                     // do not disable secure processing - these are well-known schemas
aoqi@0:                     SchemaFactory sf = XmlFactory.createSchemaFactory(XMLConstants.W3C_XML_SCHEMA_NS_URI, false);
aoqi@0:                     schema = allowExternalAccess(sf, "file", false).newSchema(source);
aoqi@0:                 } catch (SAXException e) {
aoqi@0:                     // we make sure that the schema is correct before we ship.
aoqi@0:                     throw new AssertionError(e);
aoqi@0:                 }
aoqi@0:             }
aoqi@0:         }
aoqi@0: 
aoqi@0:         ValidatorHandler handler = schema.newValidatorHandler();
aoqi@0:         return handler;
aoqi@0:     }
aoqi@0: 
aoqi@0: }