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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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
*
* http://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.apache.axiom.om.ds;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import javax.xml.stream.XMLStreamWriter;
import org.apache.axiom.attachments.impl.BufferUtils;
import org.apache.axiom.attachments.utils.BAAInputStream;
import org.apache.axiom.attachments.utils.BAAOutputStream;
import org.apache.axiom.om.OMDataSourceExt;
import org.apache.axiom.om.OMException;
import org.apache.axiom.om.OMOutputFormat;
import org.apache.axiom.om.ds.OMDataSourceExtBase;
import org.apache.axiom.om.util.CommonUtils;
import org.apache.axiom.om.util.StAXUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* A DataSource that is backed by an InputStream (read from a parser).
* The Data in this Data source owns the payload inputStream.
*/
public class ParserInputStreamDataSource extends OMDataSourceExtBase {
private static final Log log =
LogFactory.getLog(ParserInputStreamDataSource.class);
// This is the backing storage.
// The "data" object contains an InputStream that contains the actual bytes.
// Copying/Marking of the InputStream is controlled by the requested Behavior.
private Data data = null;
// This behavior provides both safety and performance
private final static int defaultBehavior = Behavior.NOT_DESTRUCTIVE;
/**
* This is the constructor that is normally called.
*
* Note that the ParserInputStreamDataSource takes ownership of the
* payload InputStream. It may copy, mark or reset the stream.
* Callers should not access the stream after this constructor is called
*
* @param payload InputStream
* @param encoding
*/
public ParserInputStreamDataSource(InputStream payload, String encoding) {
this(payload,
encoding, defaultBehavior );
}
/**
* This constructor is used to test the different Behavior settings.
*
* Note that the ParserInputStreamDataSource takes ownership of the
* payload InputStream. It may copy, mark or reset the stream.
* Callers should not access the stream after this constructor is called.
*
* @param payload
* @param encoding
* @param behavior
*/
public ParserInputStreamDataSource(InputStream payload,
String encoding,
int behavior) {
data = new Data(payload,
(encoding!=null)?encoding:"UTF-8",
behavior);
}
public void serialize(OutputStream output, OMOutputFormat format) throws XMLStreamException {
if(log.isDebugEnabled()){
log.debug("Entry ParserInputStreamDataSource.serialize(OutputStream, OMOutputFormat");
}
String encoding = (format!=null)?format.getCharSetEncoding():null;
try {
if (!data.encoding.equalsIgnoreCase(encoding)) {
byte[] bytes = getXMLBytes(encoding);
output.write(bytes);
} else {
// Write the input stream to the output stream
InputStream is = data.readParserInputStream();
if(is!=null){
BufferUtils.inputStream2OutputStream(is, output);
}
}
if(log.isDebugEnabled()){
log.debug("Exit ParserInputStreamDataSource.serialize(OutputStream, OMOutputFormat");
}
} catch (UnsupportedEncodingException e) {
throw new XMLStreamException(e);
} catch (IOException e) {
throw new XMLStreamException(e);
}
}
public void serialize(XMLStreamWriter xmlWriter) throws XMLStreamException {
if(log.isDebugEnabled()){
log.debug("Entry ParserInputStreamDataSource.serialize(XMLStreamWriter)");
}
super.serialize(xmlWriter);
if(log.isDebugEnabled()){
log.debug("Exit ParserInputStreamDataSource.serialize(XMLStreamWriter)");
}
}
public XMLStreamReader getReader() throws XMLStreamException {
if(log.isDebugEnabled()){
log.debug("Entry ParserInputStreamDataSource.getReader()");
}
InputStream is = data.readParserInputStream();
if(is == null){
//Parser content has already been read.
if(log.isDebugEnabled()){
log.warn("Parser content has already been read");
}
}
XMLStreamReader reader = StAXUtils.createXMLStreamReader(is, data.encoding);
if(log.isDebugEnabled()){
log.debug("Exit ParserInputStreamDataSource.getReader()");
}
return reader;
}
/*
* Note that the returned InputStream may be different than the one
* passed in the constructor.
* The caller may not used the mark or reset methods on the InputStream
* (non-Javadoc)
* @see org.apache.axiom.om.ds.OMDataSourceExtBase#getXMLInputStream(java.lang.String)
*/
public InputStream getXMLInputStream(String encoding)
throws UnsupportedEncodingException {
try{
return data.readParserInputStream();
}catch(XMLStreamException e){
throw new OMException(e);
}
}
public int numReads() {
return data.numReads;
}
public Object getObject() {
return data;
}
public boolean isDestructiveRead() {
// If DESTRUCTIVE return true
// If NOT_DESTRUCTIVE return false
// If ONE_USE_UNSAFE, we lie and tell the engine false
// ...but we will intentionally fail on second access.
return (data.behavior == Behavior.DESTRUCTIVE);
}
public boolean isDestructiveWrite() {
// If DESTRUCTIVE return true
// If NOT_DESTRUCTIVE return false
// If ONE_USE_UNSAFE, we lie and tell the engine false
// ...but we will intentionally fail on second access.
return (data.behavior == Behavior.DESTRUCTIVE);
}
public byte[] getXMLBytes(String encoding){
if(log.isDebugEnabled()){
log.debug("Entry ParserInputStreamDataSource.getXMLBytes(encoding)");
}
try{
InputStream is = data.readParserInputStream();
if(is != null){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
OMOutputFormat format = new OMOutputFormat();
format.setCharSetEncoding(encoding);
try {
BufferUtils.inputStream2OutputStream(is, baos);
if(log.isDebugEnabled()){
log.debug("Exit ParserInputStreamDataSource.getXMLBytes(encoding)");
}
return baos.toByteArray();
} catch (IOException e) {
throw new OMException(e);
}
}else{
//Someone already read the parser, happens in serialize call. I expect user to invoke this
//via SerializeAndConsume call
if(log.isDebugEnabled()){
log.warn("Parser was already read, recovering by just returning new byte[0]");
log.debug("Exit ParserInputStreamDataSource.getXMLBytes(encoding)");
}
return new byte[0];
}
}catch(XMLStreamException e){
throw new OMException(e);
}
}
public void close() {
if(log.isDebugEnabled()){
log.debug("Entry ParserInputStreamDataSource.close()");
}
if (data.payload != null) {
try {
data.payload.close();
} catch (IOException e) {
throw new OMException(e);
}
data.payload = null;
}
if(log.isDebugEnabled()){
log.debug("Exit ParserInputStreamDataSource.close()");
}
}
/**
* Return a InputStreamDataSource backed by a ByteArrayInputStream
*/
public OMDataSourceExt copy() {
if(log.isDebugEnabled()){
log.debug("Enter ParserInputStreamDataSource.copy()");
}
try {
BAAOutputStream baaos = new BAAOutputStream();
BufferUtils.inputStream2OutputStream(data.readParserInputStream(), baaos);
BAAInputStream baais = new BAAInputStream(baaos.buffers(),
baaos.length());
if (log.isDebugEnabled()) {
log.debug("Exit ParserInputStreamDataSource.copy()");
}
return new ParserInputStreamDataSource(baais, data.encoding, data.behavior);
} catch (Throwable t) {
if(log.isDebugEnabled()){
log.debug("Error ParserInputStreamDataSource.copy(): ", t);
}
throw new OMException(t);
}
}
public class Data{
// The InputStream containing the byte data
private InputStream payload = null;
// The encoding (i.e. UTF-8)
private String encoding = null;
// The designated Behavior. @see Behavior
private int behavior;
// Track the number of read accesses.
// ONE_USE_UNSAFE will intentionally fail on second read.
private int numReads = 0;
// Track the first use when ONE_USE_UNSAFE is requested
private String firstUseStack = null;
/**
* Intentionally provide. Only created by ParserInputStreamDataSource
* @param payload
* @param encoding
* @param behavior
*/
private Data(InputStream payload,
String encoding,
int behavior) {
this.payload = payload;
this.encoding = encoding;
this.behavior = behavior;
setInputStream(payload);
}
/**
* @return InputStream that consumer should use..this may be different
* than the InputStream initially handed to the ParsedDataEntitySource
* @throws XMLStreamException
* @throws OMException if second access and ONE_USE_UNSAFE or other problems occur
*/
public InputStream readParserInputStream() throws XMLStreamException{
numReads++;
// Dump our state
if(log.isDebugEnabled()){
log.debug("Entry readParserInputStream()");
log.debug("Data Encoding = "+encoding);
log.debug("numReads = "+numReads);
log.debug("behavior = "+behavior);
// The call stack is helpful to identify non-performant call flows
String stack = CommonUtils.stackToString(new OMException());
log.debug("call stack:" + stack);
}
// TODO NLS
if(payload == null){
throw new OMException("ParserInputStreamDataSource's InputStream is null.");
}
if (behavior == Behavior.NOT_DESTRUCTIVE) {
if (numReads > 1) {
try {
// For NOT_DESTRUCTIVE, the
// InputStream (either the original or copied InputStream)
// is reset for reuse.
if(log.isDebugEnabled()){
log.debug("reset InputStream for reuse");
}
payload.reset();
} catch (Throwable t) {
throw new OMException(t);
}
}
} else if (behavior == Behavior.ONE_USE_UNSAFE) {
// For ONE_USE_UNSAFE,
// remember the first call
// intentionally fail on the second call
if (numReads == 1) {
firstUseStack = CommonUtils.stackToString(new OMException());
if(log.isDebugEnabled()){
log.debug("ONE_USE_UNSAFE mode stack:" + firstUseStack);
}
} else {
// TODO NLS
OMException ome =
new OMException("A second read of ParserInputStreamDataSource is not allowed."
+ "The first read was done here: " + firstUseStack);
if(log.isDebugEnabled()){
log.debug("ONE_USE_UNSAFE second use exception:" + ome);
}
throw ome;
}
}
if(log.isDebugEnabled()){
log.debug("Exit readParserInputStream()");
}
return payload;
}
public void setInputStream(InputStream inputStream) {
if(log.isDebugEnabled()){
String clsName = inputStream == null ?
null :
inputStream.getClass().getName();
log.debug("Enter setInputStream: The kind of InputStream is:" + clsName);
}
this.numReads = 0;
this.firstUseStack = null;
if (inputStream == null) {
if(log.isDebugEnabled()){
log.debug("The inputStream is null");
}
payload = null;
} else if (behavior == Behavior.NOT_DESTRUCTIVE) {
if (inputStream.markSupported()) {
if(log.isDebugEnabled()){
log.debug("The inputStream supports mark(). Setting mark()");
}
// use mark/reset
payload = inputStream;
payload.mark(Integer.MAX_VALUE);
} else {
try {
if(log.isDebugEnabled()){
log.debug("The inputStream does not supports mark(). Copying Stream");
}
// make a non-contiguous resettable input stream
BAAOutputStream baaos = new BAAOutputStream();
BufferUtils.inputStream2OutputStream(inputStream, baaos);
BAAInputStream baais = new BAAInputStream(baaos.buffers(),
baaos.length());
payload = baais;
payload.mark(Integer.MAX_VALUE);
} catch (Throwable t) {
if(log.isDebugEnabled()){
log.debug("Error:", t);
}
throw new OMException(t);
}
}
} else {
payload = inputStream;
}
if(log.isDebugEnabled()){
log.debug("Exit setInputStream");
}
}
}
}
