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/**
* Copyright (C) 2006-2014 phloc systems
* http://www.phloc.com
* office[at]phloc[dot]com
*
* 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.phloc.commons.microdom.serialize;
import java.io.File;
import java.io.OutputStream;
import java.io.Writer;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.WillClose;
import javax.annotation.concurrent.Immutable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.phloc.commons.CGlobal;
import com.phloc.commons.ValueEnforcer;
import com.phloc.commons.annotations.PresentForCodeCoverage;
import com.phloc.commons.io.file.FileUtils;
import com.phloc.commons.io.streams.NonBlockingStringWriter;
import com.phloc.commons.io.streams.StreamUtils;
import com.phloc.commons.microdom.IMicroNode;
import com.phloc.commons.state.ESuccess;
import com.phloc.commons.stats.IStatisticsHandlerSize;
import com.phloc.commons.stats.StatisticsManager;
import com.phloc.commons.xml.serialize.IXMLSerializer;
import com.phloc.commons.xml.serialize.IXMLWriterSettings;
import com.phloc.commons.xml.serialize.XMLWriterSettings;
/**
* Utility class for serializing micro document objects.
*
* @author Philip Helger
*/
@Immutable
public final class MicroWriter
{
private static final Logger s_aLogger = LoggerFactory.getLogger (MicroWriter.class);
private static final IStatisticsHandlerSize s_aSizeHdl = StatisticsManager.getSizeHandler (MicroWriter.class);
@PresentForCodeCoverage
@SuppressWarnings ("unused")
private static final MicroWriter s_aInstance = new MicroWriter ();
private MicroWriter ()
{}
/**
* Write a Micro Node to a file using the default settings.
*
* @param aNode
* The node to be serialized. May be any kind of node (incl.
* documents). May not be null.
* @param aFile
* The file to write to. May not be null.
* @return {@link ESuccess}
*/
@Nonnull
public static ESuccess writeToFile (@Nonnull final IMicroNode aNode, @Nonnull final File aFile)
{
return writeToFile (aNode, aFile, XMLWriterSettings.DEFAULT_XML_SETTINGS);
}
/**
* Write a Micro Node to a file.
*
* @param aNode
* The node to be serialized. May be any kind of node (incl.
* documents). May not be null.
* @param aFile
* The file to write to. May not be null.
* @param aSettings
* The settings to be used for the creation. May not be
* null.
* @return {@link ESuccess}
*/
@Nonnull
public static ESuccess writeToFile (@Nonnull final IMicroNode aNode,
@Nonnull final File aFile,
@Nonnull final IXMLWriterSettings aSettings)
{
ValueEnforcer.notNull (aFile, "File");
final OutputStream aOS = FileUtils.getOutputStream (aFile);
if (aOS == null)
return ESuccess.FAILURE;
// No need to wrap the OS in a BufferedOutputStream as inside, it is later
// on wrapped in a BufferedWriter
return writeToStream (aNode, aOS, aSettings);
}
/**
* Write a Micro Node to an output stream using the default settings.
*
* @param aNode
* The node to be serialized. May be any kind of node (incl.
* documents). May not be null.
* @param aOS
* The output stream to write to. May not be null. The
* output stream is closed anyway directly after the operation finishes
* (on success and on error).
* @return {@link ESuccess}
*/
@Nonnull
public static ESuccess writeToStream (@Nonnull final IMicroNode aNode, @Nonnull @WillClose final OutputStream aOS)
{
return writeToStream (aNode, aOS, XMLWriterSettings.DEFAULT_XML_SETTINGS);
}
/**
* Write a Micro Node to an {@link OutputStream}.
*
* @param aNode
* The node to be serialized. May be any kind of node (incl.
* documents). May not be null.
* @param aOS
* The output stream to write to. May not be null. The
* output stream is closed anyway directly after the operation finishes
* (on success and on error).
* @param aSettings
* The settings to be used for the creation. May not be
* null.
* @return {@link ESuccess}
*/
@Nonnull
public static ESuccess writeToStream (@Nonnull final IMicroNode aNode,
@Nonnull @WillClose final OutputStream aOS,
@Nonnull final IXMLWriterSettings aSettings)
{
ValueEnforcer.notNull (aNode, "Node");
ValueEnforcer.notNull (aOS, "OutputStream");
ValueEnforcer.notNull (aSettings, "Settings");
try
{
final IXMLSerializer aSerializer = new MicroSerializer (aSettings);
aSerializer.write (aNode, aOS);
return ESuccess.SUCCESS;
}
finally
{
StreamUtils.close (aOS);
}
}
/**
* Write a Micro Node to a {@link Writer}.
*
* @param aNode
* The node to be serialized. May be any kind of node (incl.
* documents). May not be null.
* @param aWriter
* The writer to write to. May not be null. The writer is
* closed anyway directly after the operation finishes (on success and
* on error).
* @param aSettings
* The settings to be used for the creation. May not be
* null.
* @return {@link ESuccess}
*/
@Nonnull
public static ESuccess writeToWriter (@Nonnull final IMicroNode aNode,
@Nonnull @WillClose final Writer aWriter,
@Nonnull final IXMLWriterSettings aSettings)
{
ValueEnforcer.notNull (aNode, "Node");
ValueEnforcer.notNull (aWriter, "Writer");
ValueEnforcer.notNull (aSettings, "Settings");
try
{
final IXMLSerializer aSerializer = new MicroSerializer (aSettings);
aSerializer.write (aNode, aWriter);
return ESuccess.SUCCESS;
}
finally
{
StreamUtils.close (aWriter);
}
}
@Nullable
public static String getNodeAsString (@Nonnull final IMicroNode aNode, @Nonnull final IXMLWriterSettings aSettings)
{
ValueEnforcer.notNull (aNode, "Node");
ValueEnforcer.notNull (aSettings, "Settings");
NonBlockingStringWriter aWriter = null;
try
{
// start serializing
aWriter = new NonBlockingStringWriter (50 * CGlobal.BYTES_PER_KILOBYTE);
if (writeToWriter (aNode, aWriter, aSettings).isSuccess ())
{
s_aSizeHdl.addSize (aWriter.size ());
return aWriter.getAsString ();
}
}
catch (final Throwable t)
{
s_aLogger.error ("Error serializing MicroDOM with settings " + aSettings.toString (), t);
}
finally
{
StreamUtils.close (aWriter);
}
return null;
}
/**
* Convert the passed micro node to an XML string using
* {@link XMLWriterSettings#DEFAULT_XML_SETTINGS}. This is a specialized
* version of {@link #getNodeAsString(IMicroNode, IXMLWriterSettings)}.
*
* @param aNode
* The node to be converted to a string. May not be null .
* @return The string representation of the passed node.
*/
@Nullable
public static String getXMLString (@Nonnull final IMicroNode aNode)
{
return getNodeAsString (aNode, XMLWriterSettings.DEFAULT_XML_SETTINGS);
}
}
