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/*
 * Copyright 2002-2019 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.util.xml;

import java.util.List;
import java.util.function.Supplier;

import javax.xml.stream.XMLEventFactory;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLEventWriter;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLResolver;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import javax.xml.stream.events.XMLEvent;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.stax.StAXResult;
import javax.xml.transform.stax.StAXSource;

import org.xml.sax.ContentHandler;
import org.xml.sax.XMLReader;

import org.springframework.lang.Nullable;
import org.springframework.util.StreamUtils;

/**
 * Convenience methods for working with the StAX API. Partly historic due to JAXP 1.3
 * compatibility; as of Spring 4.0, relying on JAXP 1.4 as included in JDK 1.6 and higher.
 *
 * 

In particular, methods for using StAX ({@code javax.xml.stream}) in combination with * the TrAX API ({@code javax.xml.transform}), and converting StAX readers/writers into SAX * readers/handlers and vice-versa. * * @author Arjen Poutsma * @author Juergen Hoeller * @since 3.0 */ public abstract class StaxUtils { private static final XMLResolver NO_OP_XML_RESOLVER = (publicID, systemID, base, ns) -> StreamUtils.emptyInput(); /** * Create an {@link XMLInputFactory} with Spring's defensive setup, * i.e. no support for the resolution of DTDs and external entities. * @return a new defensively initialized input factory instance to use * @since 5.0 */ public static XMLInputFactory createDefensiveInputFactory() { return createDefensiveInputFactory(XMLInputFactory::newInstance); } /** * Variant of {@link #createDefensiveInputFactory()} with a custom instance. * @param instanceSupplier supplier for the input factory instance * @return a new defensively initialized input factory instance to use * @since 5.0.12 */ public static T createDefensiveInputFactory(Supplier instanceSupplier) { T inputFactory = instanceSupplier.get(); inputFactory.setProperty(XMLInputFactory.SUPPORT_DTD, false); inputFactory.setProperty(XMLInputFactory.IS_SUPPORTING_EXTERNAL_ENTITIES, false); inputFactory.setXMLResolver(NO_OP_XML_RESOLVER); return inputFactory; } /** * Create a JAXP 1.4 {@link StAXSource} for the given {@link XMLStreamReader}. * @param streamReader the StAX stream reader * @return a source wrapping the {@code streamReader} */ public static Source createStaxSource(XMLStreamReader streamReader) { return new StAXSource(streamReader); } /** * Create a JAXP 1.4 {@link StAXSource} for the given {@link XMLEventReader}. * @param eventReader the StAX event reader * @return a source wrapping the {@code eventReader} */ public static Source createStaxSource(XMLEventReader eventReader) throws XMLStreamException { return new StAXSource(eventReader); } /** * Create a custom, non-JAXP 1.4 StAX {@link Source} for the given {@link XMLStreamReader}. * @param streamReader the StAX stream reader * @return a source wrapping the {@code streamReader} */ public static Source createCustomStaxSource(XMLStreamReader streamReader) { return new StaxSource(streamReader); } /** * Create a custom, non-JAXP 1.4 StAX {@link Source} for the given {@link XMLEventReader}. * @param eventReader the StAX event reader * @return a source wrapping the {@code eventReader} */ public static Source createCustomStaxSource(XMLEventReader eventReader) { return new StaxSource(eventReader); } /** * Indicate whether the given {@link Source} is a JAXP 1.4 StAX Source or * custom StAX Source. * @return {@code true} if {@code source} is a JAXP 1.4 {@link StAXSource} or * custom StAX Source; {@code false} otherwise */ public static boolean isStaxSource(Source source) { return (source instanceof StAXSource || source instanceof StaxSource); } /** * Return the {@link XMLStreamReader} for the given StAX Source. * @param source a JAXP 1.4 {@link StAXSource} * @return the {@link XMLStreamReader} * @throws IllegalArgumentException if {@code source} isn't a JAXP 1.4 {@link StAXSource} * or custom StAX Source */ @Nullable public static XMLStreamReader getXMLStreamReader(Source source) { if (source instanceof StAXSource) { return ((StAXSource) source).getXMLStreamReader(); } else if (source instanceof StaxSource) { return ((StaxSource) source).getXMLStreamReader(); } else { throw new IllegalArgumentException("Source '" + source + "' is neither StaxSource nor StAXSource"); } } /** * Return the {@link XMLEventReader} for the given StAX Source. * @param source a JAXP 1.4 {@link StAXSource} * @return the {@link XMLEventReader} * @throws IllegalArgumentException if {@code source} isn't a JAXP 1.4 {@link StAXSource} * or custom StAX Source */ @Nullable public static XMLEventReader getXMLEventReader(Source source) { if (source instanceof StAXSource) { return ((StAXSource) source).getXMLEventReader(); } else if (source instanceof StaxSource) { return ((StaxSource) source).getXMLEventReader(); } else { throw new IllegalArgumentException("Source '" + source + "' is neither StaxSource nor StAXSource"); } } /** * Create a JAXP 1.4 {@link StAXResult} for the given {@link XMLStreamWriter}. * @param streamWriter the StAX stream writer * @return a result wrapping the {@code streamWriter} */ public static Result createStaxResult(XMLStreamWriter streamWriter) { return new StAXResult(streamWriter); } /** * Create a JAXP 1.4 {@link StAXResult} for the given {@link XMLEventWriter}. * @param eventWriter the StAX event writer * @return a result wrapping {@code streamReader} */ public static Result createStaxResult(XMLEventWriter eventWriter) { return new StAXResult(eventWriter); } /** * Create a custom, non-JAXP 1.4 StAX {@link Result} for the given {@link XMLStreamWriter}. * @param streamWriter the StAX stream writer * @return a source wrapping the {@code streamWriter} */ public static Result createCustomStaxResult(XMLStreamWriter streamWriter) { return new StaxResult(streamWriter); } /** * Create a custom, non-JAXP 1.4 StAX {@link Result} for the given {@link XMLEventWriter}. * @param eventWriter the StAX event writer * @return a source wrapping the {@code eventWriter} */ public static Result createCustomStaxResult(XMLEventWriter eventWriter) { return new StaxResult(eventWriter); } /** * Indicate whether the given {@link Result} is a JAXP 1.4 StAX Result or * custom StAX Result. * @return {@code true} if {@code result} is a JAXP 1.4 {@link StAXResult} or * custom StAX Result; {@code false} otherwise */ public static boolean isStaxResult(Result result) { return (result instanceof StAXResult || result instanceof StaxResult); } /** * Return the {@link XMLStreamWriter} for the given StAX Result. * @param result a JAXP 1.4 {@link StAXResult} * @return the {@link XMLStreamReader} * @throws IllegalArgumentException if {@code source} isn't a JAXP 1.4 {@link StAXResult} * or custom StAX Result */ @Nullable public static XMLStreamWriter getXMLStreamWriter(Result result) { if (result instanceof StAXResult) { return ((StAXResult) result).getXMLStreamWriter(); } else if (result instanceof StaxResult) { return ((StaxResult) result).getXMLStreamWriter(); } else { throw new IllegalArgumentException("Result '" + result + "' is neither StaxResult nor StAXResult"); } } /** * Return the {@link XMLEventWriter} for the given StAX Result. * @param result a JAXP 1.4 {@link StAXResult} * @return the {@link XMLStreamReader} * @throws IllegalArgumentException if {@code source} isn't a JAXP 1.4 {@link StAXResult} * or custom StAX Result */ @Nullable public static XMLEventWriter getXMLEventWriter(Result result) { if (result instanceof StAXResult) { return ((StAXResult) result).getXMLEventWriter(); } else if (result instanceof StaxResult) { return ((StaxResult) result).getXMLEventWriter(); } else { throw new IllegalArgumentException("Result '" + result + "' is neither StaxResult nor StAXResult"); } } /** * Create a {@link XMLEventReader} from the given list of {@link XMLEvent}. * @param events the list of {@link XMLEvent XMLEvents}. * @return an {@code XMLEventReader} that reads from the given events * @since 5.0 */ public static XMLEventReader createXMLEventReader(List events) { return new ListBasedXMLEventReader(events); } /** * Create a SAX {@link ContentHandler} that writes to the given StAX {@link XMLStreamWriter}. * @param streamWriter the StAX stream writer * @return a content handler writing to the {@code streamWriter} */ public static ContentHandler createContentHandler(XMLStreamWriter streamWriter) { return new StaxStreamHandler(streamWriter); } /** * Create a SAX {@link ContentHandler} that writes events to the given StAX {@link XMLEventWriter}. * @param eventWriter the StAX event writer * @return a content handler writing to the {@code eventWriter} */ public static ContentHandler createContentHandler(XMLEventWriter eventWriter) { return new StaxEventHandler(eventWriter); } /** * Create a SAX {@link XMLReader} that reads from the given StAX {@link XMLStreamReader}. * @param streamReader the StAX stream reader * @return a XMLReader reading from the {@code streamWriter} */ public static XMLReader createXMLReader(XMLStreamReader streamReader) { return new StaxStreamXMLReader(streamReader); } /** * Create a SAX {@link XMLReader} that reads from the given StAX {@link XMLEventReader}. * @param eventReader the StAX event reader * @return a XMLReader reading from the {@code eventWriter} */ public static XMLReader createXMLReader(XMLEventReader eventReader) { return new StaxEventXMLReader(eventReader); } /** * Return a {@link XMLStreamReader} that reads from a {@link XMLEventReader}. * Useful because the StAX {@code XMLInputFactory} allows one to create an * event reader from a stream reader, but not vice-versa. * @return a stream reader that reads from an event reader */ public static XMLStreamReader createEventStreamReader(XMLEventReader eventReader) throws XMLStreamException { return new XMLEventStreamReader(eventReader); } /** * Return a {@link XMLStreamWriter} that writes to a {@link XMLEventWriter}. * @return a stream writer that writes to an event writer * @since 3.2 */ public static XMLStreamWriter createEventStreamWriter(XMLEventWriter eventWriter) { return new XMLEventStreamWriter(eventWriter, XMLEventFactory.newFactory()); } /** * Return a {@link XMLStreamWriter} that writes to a {@link XMLEventWriter}. * @return a stream writer that writes to an event writer * @since 3.0.5 */ public static XMLStreamWriter createEventStreamWriter(XMLEventWriter eventWriter, XMLEventFactory eventFactory) { return new XMLEventStreamWriter(eventWriter, eventFactory); } }





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