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Java 1.8+ Library with XML handling routines
/*
* Copyright (C) 2014-2023 Philip Helger (www.helger.com)
* philip[at]helger[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.helger.xml.microdom.serialize;
import java.io.File;
import java.io.OutputStream;
import java.io.Writer;
import java.nio.file.Path;
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.helger.commons.CGlobal;
import com.helger.commons.ValueEnforcer;
import com.helger.commons.annotation.PresentForCodeCoverage;
import com.helger.commons.io.file.FileHelper;
import com.helger.commons.io.stream.NonBlockingByteArrayOutputStream;
import com.helger.commons.io.stream.NonBlockingStringWriter;
import com.helger.commons.io.stream.StreamHelper;
import com.helger.commons.state.ESuccess;
import com.helger.xml.microdom.IMicroNode;
import com.helger.xml.serialize.write.IXMLWriterSettings;
import com.helger.xml.serialize.write.XMLWriterSettings;
/**
* Utility class for serializing micro document objects.
*
* @author Philip Helger
*/
@Immutable
public final class MicroWriter
{
private static final Logger LOGGER = LoggerFactory.getLogger (MicroWriter.class);
@PresentForCodeCoverage
private static final MicroWriter INSTANCE = 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 = FileHelper.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 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 aPath
* The file to write to. May not be null.
* @return {@link ESuccess}
*/
@Nonnull
public static ESuccess writeToFile (@Nonnull final IMicroNode aNode, @Nonnull final Path aPath)
{
return writeToFile (aNode, aPath, 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 aPath
* 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 Path aPath,
@Nonnull final IXMLWriterSettings aSettings)
{
ValueEnforcer.notNull (aPath, "Path");
return writeToFile (aNode, aPath.toFile (), 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 MicroSerializer aSerializer = new MicroSerializer (aSettings);
aSerializer.write (aNode, aOS);
return ESuccess.SUCCESS;
}
finally
{
StreamHelper.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 MicroSerializer aSerializer = new MicroSerializer (aSettings);
aSerializer.write (aNode, aWriter);
return ESuccess.SUCCESS;
}
finally
{
StreamHelper.close (aWriter);
}
}
/**
* Write a Micro Node to a {@link Writer} using the default
* {@link XMLWriterSettings#DEFAULT_XML_SETTINGS}.
*
* @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).
* @return {@link ESuccess}
* @since 8.6.3
*/
@Nonnull
public static ESuccess writeToWriter (@Nonnull final IMicroNode aNode, @Nonnull @WillClose final Writer aWriter)
{
return writeToWriter (aNode, aWriter, XMLWriterSettings.DEFAULT_XML_SETTINGS);
}
/**
* Convert the passed micro node to an XML string using the provided settings.
*
* @param aNode
* The node to be converted to a string. May not be null .
* @param aSettings
* The XML writer settings to use. May not be null.
* @return The string representation of the passed node.
*/
@Nullable
public static String getNodeAsString (@Nonnull final IMicroNode aNode, @Nonnull final IXMLWriterSettings aSettings)
{
ValueEnforcer.notNull (aNode, "Node");
ValueEnforcer.notNull (aSettings, "Settings");
try (final NonBlockingStringWriter aWriter = new NonBlockingStringWriter (50 * CGlobal.BYTES_PER_KILOBYTE))
{
// start serializing
if (writeToWriter (aNode, aWriter, aSettings).isSuccess ())
return aWriter.getAsString ();
}
catch (final Exception ex)
{
LOGGER.error ("Error serializing MicroDOM with settings " + aSettings.toString (), ex);
}
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.
* @since 8.6.3
*/
@Nullable
public static String getNodeAsString (@Nonnull final IMicroNode aNode)
{
return getNodeAsString (aNode, XMLWriterSettings.DEFAULT_XML_SETTINGS);
}
/**
* Convert the passed micro node to an XML byte array using the provided
* settings.
*
* @param aNode
* The node to be converted to a byte array. May not be
* null .
* @param aSettings
* The XML writer settings to use. May not be null.
* @return The byte array representation of the passed node.
* @since 8.6.3
*/
@Nullable
public static byte [] getNodeAsBytes (@Nonnull final IMicroNode aNode, @Nonnull final IXMLWriterSettings aSettings)
{
ValueEnforcer.notNull (aNode, "Node");
ValueEnforcer.notNull (aSettings, "Settings");
try (final NonBlockingByteArrayOutputStream aBAOS = new NonBlockingByteArrayOutputStream (50 *
CGlobal.BYTES_PER_KILOBYTE))
{
// start serializing
if (writeToStream (aNode, aBAOS, aSettings).isSuccess ())
return aBAOS.toByteArray ();
}
catch (final Exception ex)
{
LOGGER.error ("Error serializing MicroDOM with settings " + aSettings.toString (), ex);
}
return null;
}
/**
* Convert the passed micro node to an XML byte array using
* {@link XMLWriterSettings#DEFAULT_XML_SETTINGS}. This is a specialized
* version of {@link #getNodeAsBytes(IMicroNode, IXMLWriterSettings)}.
*
* @param aNode
* The node to be converted to a byte array. May not be
* null .
* @return The byte array representation of the passed node.
* @since 8.6.3
*/
@Nullable
public static byte [] getNodeAsBytes (@Nonnull final IMicroNode aNode)
{
return getNodeAsBytes (aNode, XMLWriterSettings.DEFAULT_XML_SETTINGS);
}
}