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https://github.com/google/nomulus.git
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87 lines
3.2 KiB
Java
87 lines
3.2 KiB
Java
// Copyright 2016 The Domain Registry Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// 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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package google.registry.xml;
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import static com.google.common.base.Throwables.propagateIfInstanceOf;
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import static com.google.common.base.Verify.verify;
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import static java.nio.charset.StandardCharsets.UTF_8;
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import com.google.re2j.Pattern;
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import java.io.ByteArrayOutputStream;
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import javax.annotation.concurrent.NotThreadSafe;
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import javax.xml.bind.JAXBContext;
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import javax.xml.bind.JAXBElement;
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import javax.xml.bind.JAXBException;
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import javax.xml.bind.MarshalException;
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import javax.xml.bind.Marshaller;
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import javax.xml.validation.Schema;
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/** JAXB marshaller for building pieces of XML documents in a single thread. */
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@NotThreadSafe
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public final class XmlFragmentMarshaller {
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private static final Pattern XMLNS_PATTERN = Pattern.compile(" xmlns:\\w+=\"[^\"]+\"");
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private final ByteArrayOutputStream os = new ByteArrayOutputStream();
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private final Marshaller marshaller;
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private final Schema schema;
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XmlFragmentMarshaller(JAXBContext jaxbContext, Schema schema) {
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try {
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marshaller = jaxbContext.createMarshaller();
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marshaller.setProperty(Marshaller.JAXB_ENCODING, UTF_8.toString());
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marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
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marshaller.setProperty(Marshaller.JAXB_FRAGMENT, true);
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} catch (JAXBException e) {
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throw new RuntimeException(e);
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}
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this.schema = schema;
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}
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/**
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* Turns an individual JAXB element into an XML fragment string.
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*
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* @throws MarshalException if schema validation failed
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*/
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public String marshal(JAXBElement<?> element) throws MarshalException {
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return internalMarshal(element, true);
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}
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/** Turns an individual JAXB element into an XML fragment string. */
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public String marshalLenient(JAXBElement<?> element) {
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try {
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return internalMarshal(element, false);
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} catch (MarshalException e) {
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throw new RuntimeException("MarshalException shouldn't be thrown in lenient mode", e);
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}
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}
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private String internalMarshal(JAXBElement<?> element, boolean strict) throws MarshalException {
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os.reset();
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marshaller.setSchema(strict ? schema : null);
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try {
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marshaller.marshal(element, os);
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} catch (JAXBException e) {
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propagateIfInstanceOf(e, MarshalException.class);
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throw new RuntimeException("Mysterious XML exception", e);
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}
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String fragment = new String(os.toByteArray(), UTF_8);
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int endOfFirstLine = fragment.indexOf(">\n");
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verify(endOfFirstLine > 0, "Bad XML fragment:\n%s", fragment);
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String firstLine = fragment.substring(0, endOfFirstLine + 2);
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String rest = fragment.substring(firstLine.length());
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return XMLNS_PATTERN.matcher(firstLine).replaceAll("") + rest;
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}
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}
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