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/* |
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* Licensed to the Apache Software Foundation (ASF) under one or more |
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* contributor license agreements. See the NOTICE file distributed with |
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* this work for additional information regarding copyright ownership. |
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* The ASF licenses this file to You under the Apache License, Version 2.0 |
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* (the "License"); you may not use this file except in compliance with |
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* the License. You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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/* $Id$ */ |
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package org.apache.fop.intermediate; |
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import java.io.InputStream; |
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import java.util.MissingResourceException; |
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import javax.xml.XMLConstants; |
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import org.w3c.dom.bootstrap.DOMImplementationRegistry; |
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import org.w3c.dom.ls.DOMImplementationLS; |
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import org.w3c.dom.ls.LSInput; |
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import org.w3c.dom.ls.LSResourceResolver; |
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/** |
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* A resource resolver that returns a cached instance of the XML Schema, that can normally |
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* be found at {@linkplain http://www.w3.org/2001/xml.xsd}. This can be used to avoid |
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* unnecessary connection to the W3C website. |
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*/ |
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final class XMLSchemaResolver implements LSResourceResolver { |
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private static final String XML_SCHEMA_SYSTEM_ID = "http://www.w3.org/2001/xml.xsd"; |
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private static final LSInput XML_SCHEMA_INPUT; |
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private static final XMLSchemaResolver INSTANCE = new XMLSchemaResolver(); |
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private XMLSchemaResolver() { } |
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static { |
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DOMImplementationRegistry registry = getDOMImplementationRegistry(); |
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DOMImplementationLS impl |
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= (DOMImplementationLS) registry.getDOMImplementation("LS 3.0"); |
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XML_SCHEMA_INPUT = impl.createLSInput(); |
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InputStream xmlSchema = loadXMLSchema(); |
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XML_SCHEMA_INPUT.setByteStream(xmlSchema); |
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} |
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private static DOMImplementationRegistry getDOMImplementationRegistry() { |
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try { |
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return DOMImplementationRegistry.newInstance(); |
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} catch (ClassCastException e) { |
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throw new ExceptionInInitializerError(e); |
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} catch (ClassNotFoundException e) { |
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throw new ExceptionInInitializerError(e); |
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} catch (InstantiationException e) { |
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throw new ExceptionInInitializerError(e); |
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} catch (IllegalAccessException e) { |
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throw new ExceptionInInitializerError(e); |
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} |
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} |
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private static InputStream loadXMLSchema() { |
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String xmlSchemaResource = "xml.xsd"; |
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InputStream xmlSchema = XMLSchemaResolver.class.getResourceAsStream(xmlSchemaResource); |
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if (xmlSchema == null) { |
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throw new MissingResourceException("Schema for XML namespace not found." |
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+ " Did you run ant junit-intermediate-format?", |
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XMLSchemaResolver.class.getName(), xmlSchemaResource); |
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} |
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return xmlSchema; |
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} |
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public static XMLSchemaResolver getInstance() { |
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return INSTANCE; |
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} |
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public LSInput resolveResource(String type, String namespaceURI, String publicId, |
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String systemId, String baseURI) { |
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if (XMLConstants.XML_NS_URI.equals(namespaceURI) && XML_SCHEMA_SYSTEM_ID.equals(systemId)) { |
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return XML_SCHEMA_INPUT; |
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} else { |
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return null; |
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} |
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} |
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} |