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/**
* Copyright (C) 2006-2015 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.reader;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
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.ValueEnforcer;
import com.phloc.commons.annotations.PresentForCodeCoverage;
import com.phloc.commons.annotations.ReturnsMutableCopy;
import com.phloc.commons.io.EAppend;
import com.phloc.commons.io.IInputStreamProvider;
import com.phloc.commons.io.IOutputStreamProvider;
import com.phloc.commons.io.streams.StreamUtils;
import com.phloc.commons.microdom.IMicroDocument;
import com.phloc.commons.microdom.IMicroElement;
import com.phloc.commons.microdom.impl.MicroDocument;
import com.phloc.commons.microdom.serialize.MicroReader;
import com.phloc.commons.microdom.serialize.MicroWriter;
import com.phloc.commons.state.ESuccess;
import com.phloc.commons.xml.serialize.XMLWriterSettings;
/**
* Simple class that reads a list from an XML input stream.
* The XML file needs to look as follows:
*
*
*
* @author Philip Helger
*/
@Immutable
public final class XMLListHandler
{
/** Name of the root element */
public static final String ELEMENT_LIST = "list";
/** Element name of a single item */
public static final String ELEMENT_ITEM = "item";
/** Attribute name for the item value */
public static final String ATTR_VALUE = "value";
private static final Logger s_aLogger = LoggerFactory.getLogger (XMLListHandler.class);
@PresentForCodeCoverage
@SuppressWarnings ("unused")
private static final XMLListHandler s_aInstance = new XMLListHandler ();
private XMLListHandler ()
{}
@Nullable
@ReturnsMutableCopy
public static List readList (@Nonnull final IInputStreamProvider aISP)
{
ValueEnforcer.notNull (aISP, "InputStreamProvider");
return readList (aISP.getInputStream ());
}
@Nonnull
public static ESuccess readList (@Nonnull final IInputStreamProvider aISP,
@Nonnull final Collection aTargetList)
{
ValueEnforcer.notNull (aISP, "InputStreamProvider");
return readList (aISP.getInputStream (), aTargetList);
}
/**
* Read a predefined XML file that contains list items.
*
* @param aIS
* The input stream to read from. May not be null.
* Automatically closed no matter whether reading succeeded or not.
* @return null if reading fails - all list items otherwise.
*/
@Nullable
@ReturnsMutableCopy
public static List readList (@Nonnull @WillClose final InputStream aIS)
{
final List ret = new ArrayList ();
if (readList (aIS, ret).isFailure ())
return null;
return ret;
}
/**
* Read a predefined XML file that contains list items.
*
* @param aIS
* The input stream to read from. May not be null.
* Automatically closed no matter whether reading succeeded or not.
* @param aTargetList
* The target collection to be filled. May not be null.
* @return {@link ESuccess#SUCCESS} if reading succeeded,
* {@link ESuccess#FAILURE} if the input stream is no valid XML or any
* other error occurred.
*/
@Nonnull
public static ESuccess readList (@Nonnull @WillClose final InputStream aIS,
@Nonnull final Collection aTargetList)
{
ValueEnforcer.notNull (aIS, "InputStream");
ValueEnforcer.notNull (aTargetList, "TargetList");
try
{
// open file
final IMicroDocument aDoc = MicroReader.readMicroXML (aIS);
if (aDoc != null)
{
readList (aDoc.getDocumentElement (), aTargetList);
return ESuccess.SUCCESS;
}
}
catch (final Throwable t)
{
s_aLogger.warn ("Failed to read list resource '" + aIS + "'", t);
}
finally
{
StreamUtils.close (aIS);
}
return ESuccess.FAILURE;
}
@Nonnull
public static ESuccess readList (@Nonnull final IMicroElement aParentElement,
@Nonnull final Collection aTargetList)
{
ValueEnforcer.notNull (aParentElement, "ParentElement");
ValueEnforcer.notNull (aTargetList, "TargetList");
try
{
// and insert all elements
for (final IMicroElement eItem : aParentElement.getAllChildElements (ELEMENT_ITEM))
{
final String sValue = eItem.getAttribute (ATTR_VALUE);
if (sValue == null)
s_aLogger.warn ("Ignoring list item because value is null");
else
if (!aTargetList.add (sValue))
s_aLogger.warn ("Ignoring list item '" + sValue + "' because value is already contained");
}
return ESuccess.SUCCESS;
}
catch (final Throwable t)
{
s_aLogger.warn ("Failed to read list document", t);
}
return ESuccess.FAILURE;
}
@Nonnull
public static IMicroDocument createListDocument (@Nonnull final Collection aCollection)
{
ValueEnforcer.notNull (aCollection, "Collection");
final IMicroDocument aDoc = new MicroDocument ();
final IMicroElement eRoot = aDoc.appendElement (ELEMENT_LIST);
for (final String sItem : aCollection)
{
final IMicroElement eItem = eRoot.appendElement (ELEMENT_ITEM);
eItem.setAttribute (ATTR_VALUE, sItem);
}
return aDoc;
}
@Nonnull
public static ESuccess writeList (@Nonnull final Collection aCollection,
@Nonnull final IOutputStreamProvider aOSP)
{
ValueEnforcer.notNull (aOSP, "OutputStreamProvider");
return writeList (aCollection, aOSP.getOutputStream (EAppend.DEFAULT));
}
/**
* Write the passed collection to the passed output stream using the
* predefined XML layout.
*
* @param aCollection
* The map to be written. May not be null.
* @param aOS
* The output stream to write to. The stream is closed independent of
* success or failure. May not be null.
* @return {@link ESuccess#SUCCESS} when everything went well,
* {@link ESuccess#FAILURE} otherwise.
*/
@Nonnull
public static ESuccess writeList (@Nonnull final Collection aCollection,
@Nonnull @WillClose final OutputStream aOS)
{
ValueEnforcer.notNull (aCollection, "Collection");
ValueEnforcer.notNull (aOS, "OutputStream");
try
{
final IMicroDocument aDoc = createListDocument (aCollection);
return MicroWriter.writeToStream (aDoc, aOS, XMLWriterSettings.DEFAULT_XML_SETTINGS);
}
finally
{
StreamUtils.close (aOS);
}
}
}
