Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
/*
* Copyright 2012-2016 MarkLogic Corporation
*
* 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
*
* 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 com.marklogic.client.io;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.marklogic.client.MarkLogicIOException;
import com.marklogic.client.io.marker.BufferableHandle;
import com.marklogic.client.io.marker.ContentHandle;
import com.marklogic.client.io.marker.ContentHandleFactory;
import com.marklogic.client.io.marker.StructureReadHandle;
import com.marklogic.client.io.marker.StructureWriteHandle;
import com.marklogic.client.io.marker.XMLReadHandle;
import com.marklogic.client.io.marker.XMLWriteHandle;
/**
*
A Source Handle represents XML content as a transform source for reading
* or transforms a source into a result for writing.
*
*
Always call {@link #close} when finished with this handle to release the resources.
*/
public class SourceHandle
extends BaseHandle
implements OutputStreamSender, BufferableHandle, ContentHandle,
XMLReadHandle, XMLWriteHandle,
StructureReadHandle, StructureWriteHandle,
Closeable
{
static final private Logger logger = LoggerFactory.getLogger(SourceHandle.class);
private Transformer transformer;
private Source content;
private InputStream underlyingStream;
/**
* Creates a factory to create a SourceHandle instance for a Transformer Source.
* @return the factory
*/
static public ContentHandleFactory newFactory() {
return new ContentHandleFactory() {
@Override
public Class[] getHandledClasses() {
return new Class[]{ Source.class };
}
@Override
public boolean isHandled(Class type) {
return Source.class.isAssignableFrom(type);
}
@Override
public ContentHandle newHandle(Class type) {
@SuppressWarnings("unchecked")
ContentHandle handle = isHandled(type) ?
(ContentHandle) new SourceHandle() : null;
return handle;
}
};
}
/**
* Zero-argument constructor.
*/
public SourceHandle() {
super();
super.setFormat(Format.XML);
setResendable(false);
}
/**
* Initializes the handle with a transform source for the content.
* @param content a transform source
*/
public SourceHandle(Source content) {
this();
set(content);
}
/**
* Returns a transformer for modifying the content.
* @return the transformer
*/
public Transformer getTransformer() {
return transformer;
}
/**
* Specifies a transformer for modifying the content.
* @param transformer the transformer
*/
public void setTransformer(Transformer transformer) {
this.transformer = transformer;
}
/**
* Specifies a transformer for modifying the content and returns the handle
* as a fluent convenience.
* @param transformer the transformer
* @return this handle
*/
public SourceHandle withTransformer(Transformer transformer) {
setTransformer(transformer);
return this;
}
/**
* Returns the transform source that produces the content.
* @return the transform source
*/
@Override
public Source get() {
return content;
}
/**
* Assigns a transform source that produces the content.
* @param content the transform source
*/
@Override
public void set(Source content) {
this.content = content;
}
/**
* Assigns a transform source that produces the content and returns
* the handle as a fluent convenience.
* @param content the transform source
* @return this handle
*/
public SourceHandle with(Source content) {
set(content);
return this;
}
/**
* Transforms the source for the content output to the result. If
* the transformer is not specified, an identity transform sends
* the source to the result. When writing, the result is stored
* in the database
* @param result the receiver of the transform output
*/
public void transform(Result result) {
if (logger.isInfoEnabled())
logger.info("Transforming source into result");
try {
if (content == null) {
throw new IllegalStateException("No source to transform");
}
Transformer transformer = null;
if (this.transformer != null) {
transformer = getTransformer();
} else {
if (logger.isWarnEnabled())
logger.warn("No transformer, so using identity transform");
transformer = TransformerFactory.newInstance().newTransformer();
}
transformer.transform(content, result);
} catch (TransformerException e) {
logger.error("Failed to transform source into result",e);
throw new MarkLogicIOException(e);
}
}
/**
* Restricts the format to XML.
*/
public void setFormat(Format format) {
if (format != Format.XML)
throw new IllegalArgumentException("SourceHandle supports the XML format only");
}
/**
* Specifies the mime type of the content and returns the handle
* as a fluent convenience.
* @param mimetype the mime type of the content
* @return this handle
*/
public SourceHandle withMimetype(String mimetype) {
setMimetype(mimetype);
return this;
}
@Override
public void fromBuffer(byte[] buffer) {
if (buffer == null || buffer.length == 0)
content = null;
else
receiveContent(new ByteArrayInputStream(buffer));
}
@Override
public byte[] toBuffer() {
try {
if (content == null)
return null;
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
write(buffer);
byte[] b = buffer.toByteArray();
fromBuffer(b);
return b;
} catch (IOException e) {
throw new MarkLogicIOException(e);
}
}
/**
* Buffers the transform source and returns the buffer as a string.
*/
@Override
public String toString() {
try {
return new String(toBuffer(),"UTF-8");
} catch (UnsupportedEncodingException e) {
throw new MarkLogicIOException(e);
}
}
@Override
protected Class receiveAs() {
return InputStream.class;
}
@Override
protected void receiveContent(InputStream content) {
try {
if (content == null) {
this.content = null;
return;
}
this.underlyingStream = content;
this.content = new StreamSource(new InputStreamReader(content, "UTF-8"));
} catch (UnsupportedEncodingException e) {
throw new MarkLogicIOException(e);
}
}
@Override
protected OutputStreamSender sendContent() {
if (content == null) {
throw new IllegalStateException("No source to transform to result for writing");
}
return this;
}
public void write(OutputStream out) throws IOException {
transform(new StreamResult(new OutputStreamWriter(out, "UTF-8")));
}
/** Always call close() when finished with this handle -- it closes the underlying InputStream.
*/
public void close() {
if ( underlyingStream != null ) {
try {
underlyingStream.close();
} catch (IOException e) {
logger.error("Failed to close underlying InputStream",e);
throw new MarkLogicIOException(e);
}
}
}
}
