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