1 /* 2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package com.sun.tools.internal.xjc; 27 28 import java.net.URL; 29 30 import javax.xml.validation.Schema; 31 import javax.xml.validation.SchemaFactory; 32 import javax.xml.validation.ValidatorHandler; 33 34 import com.sun.xml.internal.bind.v2.util.XmlFactory; 35 import javax.xml.XMLConstants; 36 import org.xml.sax.SAXException; 37 38 import static com.sun.xml.internal.bind.v2.util.XmlFactory.allowFileAccess; 39 40 /** 41 * Wraps a JAXP {@link Schema} object and lazily instantiate it. 42 * 43 * This object is thread-safe. There should be only one instance of 44 * this for the whole VM. 45 * 46 * @author Kohsuke Kawaguchi 47 */ 48 public final class SchemaCache { 49 50 private Schema schema; 51 52 private final URL source; 53 54 public SchemaCache(URL source) { 55 this.source = source; 56 } 57 58 public ValidatorHandler newValidator() { 59 synchronized(this) { 60 if(schema==null) { 61 try { 62 // do not disable secure processing - these are well-known schemas 63 SchemaFactory sf = XmlFactory.createSchemaFactory(XMLConstants.W3C_XML_SCHEMA_NS_URI, false); 64 schema = allowFileAccess(sf, false).newSchema(source); 65 } catch (SAXException e) { 66 // we make sure that the schema is correct before we ship. 67 throw new AssertionError(e); 68 } 69 } 70 } 71 72 ValidatorHandler handler = schema.newValidatorHandler(); 73 return handler; 74 } 75 76 }