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/* Stax2 API extension for Streaming Api for Xml processing (StAX).
*
* Copyright (c) 2006- Tatu Saloranta, [email protected]
*
* Licensed under the License specified in the file LICENSE which is
* included with the source code.
* You may not use this file except in compliance with the License.
*
* 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.codehaus.stax2.ri.dom;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.text.MessageFormat;
import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import javax.xml.stream.*;
import org.w3c.dom.*;
import org.codehaus.stax2.XMLStreamLocation2;
import org.codehaus.stax2.XMLStreamReader2;
import org.codehaus.stax2.XMLStreamWriter2;
import org.codehaus.stax2.ri.typed.SimpleValueEncoder;
import org.codehaus.stax2.typed.Base64Variant;
import org.codehaus.stax2.typed.Base64Variants;
import org.codehaus.stax2.validation.*;
/**
* This is an adapter class that partially implements {@link XMLStreamWriter}
* as a facade on top of a DOM document or Node, allowing one
* to basically construct DOM trees via Stax API.
* It is meant to serve as basis for a full implementation.
*
* Note that the implementation is only to be used with
* javax.xml.transform.dom.DOMResult. It can however be
* used for both full documents, and single element root fragments,
* depending on what node is passed as the argument.
*
* One more implementation note: much code is identical to one
* used by {@link org.codehaus.stax2.ri.Stax2WriterAdapter}.
* Alas it is hard to reuse it without cut'n pasting.
*
* @author Tatu Saloranta
*
* @since 3.0
*/
public abstract class DOMWrappingWriter
implements XMLStreamWriter2
{
// // Constants to use as defaults for "writeStartDocument"
final static String DEFAULT_OUTPUT_ENCODING = "UTF-8";
final static String DEFAULT_XML_VERSION = "1.0";
/*
/**********************************************************************
/* Configuration
/**********************************************************************
*/
protected final boolean mNsAware;
protected final boolean mNsRepairing;
/**
* This member variable is to keep information about encoding
* that seems to be used for the document (or fragment) to output,
* if known.
*/
protected String mEncoding = null;
/**
* If we are being given info about existing bindings, it'll come
* as a NamespaceContext.
*/
protected NamespaceContext mNsContext;
/*
/**********************************************************************
/* State
/**********************************************************************
*/
/**
* We need a reference to the document hosting nodes to
* be able to create new nodes
*/
protected final Document mDocument;
/*
/**********************************************************************
/* Helper objects
/**********************************************************************
*/
/**
* Encoding of typed values is used the standard encoder
* included in RI.
*/
protected SimpleValueEncoder mValueEncoder;
/*
/**********************************************************************
/* Life-cycle
/**********************************************************************
*/
protected DOMWrappingWriter(Node treeRoot, boolean nsAware, boolean nsRepairing)
throws XMLStreamException
{
if (treeRoot == null) {
throw new IllegalArgumentException("Can not pass null Node for constructing a DOM-based XMLStreamWriter");
}
mNsAware = nsAware;
mNsRepairing = nsRepairing;
/* Ok; we need a document node; or an element node; or a document
* fragment node.
*/
switch (treeRoot.getNodeType()) {
case Node.DOCUMENT_NODE: // fine
mDocument = (Document) treeRoot;
/* Should try to find encoding, version and stand-alone
* settings... but is there a standard way of doing that?
*/
break;
case Node.ELEMENT_NODE: // can make sub-tree... ok
mDocument = treeRoot.getOwnerDocument();
break;
case Node.DOCUMENT_FRAGMENT_NODE: // as with element...
mDocument = treeRoot.getOwnerDocument();
// Above types are fine
break;
default: // other Nodes not usable
throw new XMLStreamException("Can not create an XMLStreamWriter for a DOM node of type "+treeRoot.getClass());
}
if (mDocument == null) {
throw new XMLStreamException("Can not create an XMLStreamWriter for given node (of type "+treeRoot.getClass()+"): did not have owner document");
}
}
/*
/**********************************************************************
/* Partial XMLStreamWriter API (Stax 1.0) impl
/**********************************************************************
*/
@Override
public void close() {
// NOP
}
@Override
public void flush() {
// NOP
}
@Override
public abstract NamespaceContext getNamespaceContext();
@Override
public abstract String getPrefix(String uri);
@Override
public abstract Object getProperty(String name);
@Override
public abstract void setDefaultNamespace(String uri);
@Override
public void setNamespaceContext(NamespaceContext context) {
mNsContext = context;
}
@Override
public abstract void setPrefix(String prefix, String uri)
throws XMLStreamException;
@Override
public abstract void writeAttribute(String localName, String value)
throws XMLStreamException;
@Override
public abstract void writeAttribute(String nsURI, String localName, String value)
throws XMLStreamException;
@Override
public abstract void writeAttribute(String prefix, String nsURI, String localName, String value)
throws XMLStreamException;
@Override
public void writeCData(String data) throws XMLStreamException
{
appendLeaf(mDocument.createCDATASection(data));
}
@Override
public void writeCharacters(char[] text, int start, int len)
throws XMLStreamException
{
writeCharacters(new String(text, start, len));
}
@Override
public void writeCharacters(String text) throws XMLStreamException
{
appendLeaf(mDocument.createTextNode(text));
}
@Override
public void writeComment(String data) throws XMLStreamException
{
appendLeaf(mDocument.createComment(data));
}
@Override
public abstract void writeDefaultNamespace(String nsURI)
throws XMLStreamException;
@Override
public void writeDTD(String dtd) throws XMLStreamException
{
/* Would need to parse contents, not easy to do via DOM
* in any case.
*/
reportUnsupported("writeDTD()");
}
@Override
public abstract void writeEmptyElement(String localName)
throws XMLStreamException;
@Override
public abstract void writeEmptyElement(String nsURI, String localName)
throws XMLStreamException;
@Override
public abstract void writeEmptyElement(String prefix, String localName, String nsURI)
throws XMLStreamException;
@Override
public abstract void writeEndDocument() throws XMLStreamException;
@Override
public void writeEntityRef(String name) throws XMLStreamException
{
appendLeaf(mDocument.createEntityReference(name));
}
@Override
public void writeProcessingInstruction(String target)
throws XMLStreamException
{
writeProcessingInstruction(target, null);
}
@Override
public void writeProcessingInstruction(String target, String data)
throws XMLStreamException
{
appendLeaf(mDocument.createProcessingInstruction(target, data));
}
@Override
public void writeStartDocument() throws XMLStreamException
{
// Note: while these defaults are not very intuitive, they
// are what Stax 1.0 specification clearly mandates:
writeStartDocument(DEFAULT_OUTPUT_ENCODING, DEFAULT_XML_VERSION);
}
@Override
public void writeStartDocument(String version) throws XMLStreamException
{
writeStartDocument(null, version);
}
@Override
public void writeStartDocument(String encoding, String version)
throws XMLStreamException
{
// Is there anything here we can or should do? No?
mEncoding = encoding;
}
/*
/**********************************************************************
/* XMLStreamWriter2 API (Stax2 v3.0): additional accessors
/**********************************************************************
*/
@Override
public XMLStreamLocation2 getLocation() {
// !!! TBI
return null;
}
@Override
public String getEncoding() {
return mEncoding;
}
@Override
public abstract boolean isPropertySupported(String name);
@Override
public abstract boolean setProperty(String name, Object value);
/*
/**********************************************************************
/* XMLStreamWriter2 API (Stax2 v2.0): extended write methods
/**********************************************************************
*/
@Override
public void writeCData(char[] text, int start, int len)
throws XMLStreamException
{
writeCData(new String(text, start, len));
}
@Override
public abstract void writeDTD(String rootName, String systemId, String publicId,
String internalSubset)
throws XMLStreamException;
//public void writeDTD(String rootName, String systemId, String publicId, String internalSubset)
@Override
public void writeFullEndElement() throws XMLStreamException
{
// No difference with DOM
writeEndElement();
}
@Override
public void writeSpace(char[] text, int start, int len)
throws XMLStreamException
{
writeSpace(new String(text, start, len));
}
@Override
public void writeSpace(String text)
throws XMLStreamException
{
/* This won't work all that well, given there's no way to
* prevent quoting/escaping. But let's do what we can, since
* the alternative (throwing an exception) doesn't seem
* especially tempting choice.
*/
writeCharacters(text);
}
@Override
public void writeStartDocument(String version, String encoding, boolean standAlone)
throws XMLStreamException
{
writeStartDocument(encoding, version);
}
/*
/**********************************************************************
/* XMLStreamWriter2 API (Stax2 v2.0): validation
/**********************************************************************
*/
@Override
public XMLValidator validateAgainst(XMLValidationSchema schema)
throws XMLStreamException
{
// !!! TBI
return null;
}
@Override
public XMLValidator stopValidatingAgainst(XMLValidationSchema schema)
throws XMLStreamException
{
// !!! TBI
return null;
}
@Override
public XMLValidator stopValidatingAgainst(XMLValidator validator)
throws XMLStreamException
{
// !!! TBI
return null;
}
@Override
public ValidationProblemHandler setValidationProblemHandler(ValidationProblemHandler h)
{
// !!! TBI
return null;
}
/*
/**********************************************************************
/* Stax2, pass-through methods
/**********************************************************************
*/
@Override
public void writeRaw(String text) throws XMLStreamException
{
reportUnsupported("writeRaw()");
}
@Override
public void writeRaw(String text, int start, int offset)
throws XMLStreamException
{
reportUnsupported("writeRaw()");
}
@Override
public void writeRaw(char[] text, int offset, int length)
throws XMLStreamException
{
reportUnsupported("writeRaw()");
}
@Override
public void copyEventFromReader(XMLStreamReader2 r, boolean preserveEventData)
throws XMLStreamException
{
// !!! TBI
}
/*
/**********************************************************************
/* Stax2, output handling
/**********************************************************************
*/
@Override
public void closeCompletely()
{
// NOP
}
/*
/**********************************************************************
/* TypedXMLStreamWriter2 implementation (Typed Access API, Stax v3.0)
/**********************************************************************
*/
// // // Typed element content write methods
@Override
public void writeBoolean(boolean value) throws XMLStreamException
{
writeCharacters(value ? "true" : "false");
}
@Override
public void writeInt(int value) throws XMLStreamException
{
writeCharacters(String.valueOf(value));
}
@Override
public void writeLong(long value) throws XMLStreamException
{
writeCharacters(String.valueOf(value));
}
@Override
public void writeFloat(float value) throws XMLStreamException
{
writeCharacters(String.valueOf(value));
}
@Override
public void writeDouble(double value) throws XMLStreamException
{
writeCharacters(String.valueOf(value));
}
@Override
public void writeInteger(BigInteger value) throws XMLStreamException
{
writeCharacters(value.toString());
}
@Override
public void writeDecimal(BigDecimal value) throws XMLStreamException
{
writeCharacters(value.toString());
}
@Override
public void writeQName(QName name) throws XMLStreamException
{
writeCharacters(serializeQNameValue(name));
}
@Override
public void writeIntArray(int[] value, int from, int length)
throws XMLStreamException
{
// true -> start with space, to allow for multiple consecutive
// to be written
writeCharacters(getValueEncoder().encodeAsString(value, from, length));
}
@Override
public void writeLongArray(long[] value, int from, int length)
throws XMLStreamException
{
// true -> start with space, for multiple segments
writeCharacters(getValueEncoder().encodeAsString(value, from, length));
}
@Override
public void writeFloatArray(float[] value, int from, int length)
throws XMLStreamException
{
// true -> start with space, for multiple segments
writeCharacters(getValueEncoder().encodeAsString(value, from, length));
}
@Override
public void writeDoubleArray(double[] value, int from, int length)
throws XMLStreamException
{
// true -> start with space, for multiple segments
writeCharacters(getValueEncoder().encodeAsString(value, from, length));
}
@Override
public void writeBinary(byte[] value, int from, int length)
throws XMLStreamException
{
writeBinary(Base64Variants.getDefaultVariant(), value, from, length);
}
@Override
public void writeBinary(Base64Variant v, byte[] value, int from, int length)
throws XMLStreamException
{
writeCharacters(getValueEncoder().encodeAsString(v, value, from, length));
}
// // // Typed attribute value write methods
@Override
public void writeBooleanAttribute(String prefix, String nsURI, String localName, boolean value)
throws XMLStreamException
{
writeAttribute(prefix, nsURI, localName, value ? "true" : "false");
}
@Override
public void writeIntAttribute(String prefix, String nsURI, String localName, int value)
throws XMLStreamException
{
writeAttribute(prefix, nsURI, localName, String.valueOf(value));
}
@Override
public void writeLongAttribute(String prefix, String nsURI, String localName, long value)
throws XMLStreamException
{
writeAttribute(prefix, nsURI, localName, String.valueOf(value));
}
@Override
public void writeFloatAttribute(String prefix, String nsURI, String localName, float value)
throws XMLStreamException
{
writeAttribute(prefix, nsURI, localName, String.valueOf(value));
}
@Override
public void writeDoubleAttribute(String prefix, String nsURI, String localName, double value)
throws XMLStreamException
{
writeAttribute(prefix, nsURI, localName, String.valueOf(value));
}
@Override
public void writeIntegerAttribute(String prefix, String nsURI, String localName, BigInteger value)
throws XMLStreamException
{
writeAttribute(prefix, nsURI, localName, value.toString());
}
@Override
public void writeDecimalAttribute(String prefix, String nsURI, String localName, BigDecimal value)
throws XMLStreamException
{
writeAttribute(prefix, nsURI, localName, value.toString());
}
@Override
public void writeQNameAttribute(String prefix, String nsURI, String localName, QName name)
throws XMLStreamException
{
writeAttribute(prefix, nsURI, localName, serializeQNameValue(name));
}
@Override
public void writeIntArrayAttribute(String prefix, String nsURI, String localName, int[] value)
throws XMLStreamException
{
writeAttribute(prefix, nsURI, localName,
getValueEncoder().encodeAsString(value, 0, value.length));
}
@Override
public void writeLongArrayAttribute(String prefix, String nsURI, String localName, long[] value) throws XMLStreamException
{
writeAttribute(prefix, nsURI, localName,
getValueEncoder().encodeAsString(value, 0, value.length));
}
@Override
public void writeFloatArrayAttribute(String prefix, String nsURI, String localName, float[] value) throws XMLStreamException
{
writeAttribute(prefix, nsURI, localName,
getValueEncoder().encodeAsString(value, 0, value.length));
}
@Override
public void writeDoubleArrayAttribute(String prefix, String nsURI, String localName, double[] value) throws XMLStreamException
{
writeAttribute(prefix, nsURI, localName,
getValueEncoder().encodeAsString(value, 0, value.length));
}
@Override
public void writeBinaryAttribute(String prefix, String nsURI, String localName, byte[] value) throws XMLStreamException
{
writeBinaryAttribute(Base64Variants.getDefaultVariant(), prefix, nsURI, localName, value);
}
@Override
public void writeBinaryAttribute(Base64Variant v, String prefix, String nsURI, String localName, byte[] value) throws XMLStreamException
{
writeAttribute(prefix, nsURI, localName,
getValueEncoder().encodeAsString(v, value, 0, value.length));
}
/*
/**********************************************************************
/* Abstract methods for sub-classes to implement
/**********************************************************************
*/
protected abstract void appendLeaf(Node n)
throws IllegalStateException;
/*
/**********************************************************************
/* Shared package methods
/**********************************************************************
*/
/**
* Method called to serialize given qualified name into valid
* String serialization, taking into account existing namespace
* bindings.
*/
protected String serializeQNameValue(QName name)
throws XMLStreamException
{
String prefix;
// Ok as is? In repairing mode need to ensure it's properly bound
if (mNsRepairing) {
String uri = name.getNamespaceURI();
// First: let's see if a valid binding already exists:
NamespaceContext ctxt = getNamespaceContext();
prefix = (ctxt == null) ? null : ctxt.getPrefix(uri);
if (prefix == null) {
// nope: need to (try to) bind
String origPrefix = name.getPrefix();
if (origPrefix == null || origPrefix.length() == 0) {
prefix = "";
/* note: could cause a namespace conflict... but
* there is nothing we can do with just stax1 stream
* writer
*/
writeDefaultNamespace(uri);
} else {
prefix = origPrefix;
writeNamespace(prefix, uri);
}
}
} else { // in non-repairing, good as is
prefix = name.getPrefix();
}
String local = name.getLocalPart();
if (prefix == null || prefix.length() == 0) {
return local;
}
// Not efficient... but should be ok
return prefix + ":" + local;
}
protected SimpleValueEncoder getValueEncoder()
{
if (mValueEncoder == null) {
mValueEncoder = new SimpleValueEncoder();
}
return mValueEncoder;
}
/*
/**********************************************************************
/* Package methods, basic output problem reporting
/**********************************************************************
*/
protected static void throwOutputError(String msg)
throws XMLStreamException
{
throw new XMLStreamException(msg);
}
protected static void throwOutputError(String format, Object arg)
throws XMLStreamException
{
String msg = MessageFormat.format(format, new Object[] { arg });
throwOutputError(msg);
}
protected void reportUnsupported(String operName)
{
throw new UnsupportedOperationException(operName+" can not be used with DOM-backed writer");
}
}