AemParser.java
/* Copyright 2002-2022 CS GROUP
* Licensed to CS GROUP (CS) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* CS 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.orekit.files.ccsds.ndm.adm.aem;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;
import org.orekit.data.DataContext;
import org.orekit.data.DataSource;
import org.orekit.errors.OrekitException;
import org.orekit.errors.OrekitMessages;
import org.orekit.files.ccsds.ndm.ParsedUnitsBehavior;
import org.orekit.files.ccsds.ndm.adm.AdmMetadataKey;
import org.orekit.files.ccsds.ndm.adm.AdmParser;
import org.orekit.files.ccsds.section.Header;
import org.orekit.files.ccsds.section.HeaderProcessingState;
import org.orekit.files.ccsds.section.KvnStructureProcessingState;
import org.orekit.files.ccsds.section.MetadataKey;
import org.orekit.files.ccsds.section.XmlStructureProcessingState;
import org.orekit.files.ccsds.utils.ContextBinding;
import org.orekit.files.ccsds.utils.FileFormat;
import org.orekit.files.ccsds.utils.lexical.ParseToken;
import org.orekit.files.ccsds.utils.lexical.TokenType;
import org.orekit.files.ccsds.utils.parsing.ProcessingState;
import org.orekit.files.general.AttitudeEphemerisFileParser;
import org.orekit.time.AbsoluteDate;
import org.orekit.utils.IERSConventions;
/**
* A parser for the CCSDS AEM (Attitude Ephemeris Message).
* <p>
* Note than starting with Orekit 11.0, CCSDS message parsers are
* mutable objects that gather the data being parsed, until the
* message is complete and the {@link #parseMessage(org.orekit.data.DataSource)
* parseMessage} method has returned. This implies that parsers
* should <em>not</em> be used in a multi-thread context. The recommended
* way to use parsers is to either dedicate one parser for each message
* and drop it afterwards, or to use a single-thread loop.
* </p>
* @author Bryan Cazabonne
* @since 10.2
*/
public class AemParser extends AdmParser<Aem, AemParser> implements AttitudeEphemerisFileParser<Aem> {
/** Pattern for splitting strings at blanks. */
private static final Pattern SPLIT_AT_BLANKS = Pattern.compile("\\s+");
/** File header. */
private Header header;
/** File segments. */
private List<AemSegment> segments;
/** Metadata for current observation block. */
private AemMetadata metadata;
/** Context binding valid for current metadata. */
private ContextBinding context;
/** Current Ephemerides block being parsed. */
private AemData currentBlock;
/** Default interpolation degree. */
private int defaultInterpolationDegree;
/** Processor for global message structure. */
private ProcessingState structureProcessor;
/** Current attitude entry. */
private AttitudeEntry currentEntry;
/**Complete constructor.
* <p>
* Calling this constructor directly is not recommended. Users should rather use
* {@link org.orekit.files.ccsds.ndm.ParserBuilder#buildAemParser()
* parserBuilder.buildAemParser()}.
* </p>
* @param conventions IERS Conventions
* @param simpleEOP if true, tidal effects are ignored when interpolating EOP
* @param dataContext used to retrieve frames, time scales, etc.
* @param missionReferenceDate reference date for Mission Elapsed Time or Mission Relative Time time systems
* (may be null if time system is absolute)
* @param defaultInterpolationDegree default interpolation degree
* @param parsedUnitsBehavior behavior to adopt for handling parsed units
*/
public AemParser(final IERSConventions conventions, final boolean simpleEOP,
final DataContext dataContext, final AbsoluteDate missionReferenceDate,
final int defaultInterpolationDegree, final ParsedUnitsBehavior parsedUnitsBehavior) {
super(Aem.ROOT, Aem.FORMAT_VERSION_KEY, conventions, simpleEOP, dataContext,
missionReferenceDate, parsedUnitsBehavior);
this.defaultInterpolationDegree = defaultInterpolationDegree;
}
/** {@inheritDoc} */
@Override
public Aem parse(final DataSource source) {
return parseMessage(source);
}
/** {@inheritDoc} */
@Override
public Header getHeader() {
return header;
}
/** {@inheritDoc} */
@Override
public void reset(final FileFormat fileFormat) {
header = new Header(2.0);
segments = new ArrayList<>();
metadata = null;
context = null;
if (fileFormat == FileFormat.XML) {
structureProcessor = new XmlStructureProcessingState(Aem.ROOT, this);
reset(fileFormat, structureProcessor);
} else {
structureProcessor = new KvnStructureProcessingState(this);
reset(fileFormat, new HeaderProcessingState(this));
}
}
/** {@inheritDoc} */
@Override
public boolean prepareHeader() {
anticipateNext(new HeaderProcessingState(this));
return true;
}
/** {@inheritDoc} */
@Override
public boolean inHeader() {
anticipateNext(structureProcessor);
return true;
}
/** {@inheritDoc} */
@Override
public boolean finalizeHeader() {
header.validate(header.getFormatVersion());
return true;
}
/** {@inheritDoc} */
@Override
public boolean prepareMetadata() {
if (metadata != null) {
return false;
}
metadata = new AemMetadata(defaultInterpolationDegree);
context = new ContextBinding(this::getConventions, this::isSimpleEOP,
this::getDataContext, this::getParsedUnitsBehavior,
this::getMissionReferenceDate,
metadata::getTimeSystem, () -> 0.0, () -> 1.0);
anticipateNext(this::processMetadataToken);
return true;
}
/** {@inheritDoc} */
@Override
public boolean inMetadata() {
anticipateNext(getFileFormat() == FileFormat.XML ? structureProcessor : this::processKvnDataToken);
return true;
}
/** {@inheritDoc} */
@Override
public boolean finalizeMetadata() {
metadata.validate(header.getFormatVersion());
return true;
}
/** {@inheritDoc} */
@Override
public boolean prepareData() {
currentBlock = new AemData();
anticipateNext(getFileFormat() == FileFormat.XML ? this::processXmlSubStructureToken : this::processMetadataToken);
return true;
}
/** {@inheritDoc} */
@Override
public boolean inData() {
anticipateNext(structureProcessor);
return true;
}
/** {@inheritDoc} */
@Override
public boolean finalizeData() {
if (metadata != null) {
currentBlock.validate(header.getFormatVersion());
segments.add(new AemSegment(metadata, currentBlock));
}
metadata = null;
context = null;
return true;
}
/** {@inheritDoc} */
@Override
public Aem build() {
final Aem file = new Aem(header, segments, getConventions(), getDataContext());
file.checkTimeSystems();
return file;
}
/** Manage attitude state section in a XML message.
* @param starting if true, parser is entering the section
* otherwise it is leaving the section
* @return always return true
*/
boolean manageXmlAttitudeStateSection(final boolean starting) {
if (starting) {
currentEntry = new AttitudeEntry(metadata);
anticipateNext(this::processXmlDataToken);
} else {
currentBlock.addData(currentEntry.getCoordinates());
currentEntry = null;
anticipateNext(structureProcessor);
}
return true;
}
/** Add a comment to the data section.
* @param comment comment to add
* @return always return true
*/
boolean addDataComment(final String comment) {
currentBlock.addComment(comment);
return true;
}
/** Process one metadata token.
* @param token token to process
* @return true if token was processed, false otherwise
*/
private boolean processMetadataToken(final ParseToken token) {
inMetadata();
try {
return token.getName() != null &&
MetadataKey.valueOf(token.getName()).process(token, context, metadata);
} catch (IllegalArgumentException iaeM) {
try {
return AdmMetadataKey.valueOf(token.getName()).process(token, context, metadata);
} catch (IllegalArgumentException iaeD) {
try {
return AemMetadataKey.valueOf(token.getName()).process(token, context, metadata);
} catch (IllegalArgumentException iaeE) {
// token has not been recognized
return false;
}
}
}
}
/** Process one XML data substructure token.
* @param token token to process
* @return true if token was processed, false otherwise
*/
private boolean processXmlSubStructureToken(final ParseToken token) {
try {
return token.getName() != null &&
XmlSubStructureKey.valueOf(token.getName()).process(token, this);
} catch (IllegalArgumentException iae) {
// token has not been recognized
return false;
}
}
/** Process one data token in a KVN message.
* @param token token to process
* @return true if token was processed, false otherwise
*/
private boolean processKvnDataToken(final ParseToken token) {
inData();
if ("COMMENT".equals(token.getName())) {
return token.getType() == TokenType.ENTRY ? currentBlock.addComment(token.getContentAsNormalizedString()) : true;
} else if (token.getType() == TokenType.RAW_LINE) {
try {
if (metadata.getAttitudeType() == null) {
throw new OrekitException(OrekitMessages.CCSDS_MISSING_KEYWORD,
AemMetadataKey.ATTITUDE_TYPE.name(), token.getFileName());
}
return currentBlock.addData(metadata.getAttitudeType().parse(metadata.isFirst(),
metadata.getEndpoints().isExternal2SpacecraftBody(),
metadata.getEulerRotSeq(),
metadata.isSpacecraftBodyRate(),
context, SPLIT_AT_BLANKS.split(token.getRawContent().trim())));
} catch (NumberFormatException nfe) {
throw new OrekitException(nfe, OrekitMessages.UNABLE_TO_PARSE_LINE_IN_FILE,
token.getLineNumber(), token.getFileName(), token.getRawContent());
}
} else {
// not a raw line, it is most probably the end of the data section
return false;
}
}
/** Process one data token in a XML message.
* @param token token to process
* @return true if token was processed, false otherwise
*/
private boolean processXmlDataToken(final ParseToken token) {
anticipateNext(this::processXmlSubStructureToken);
try {
return token.getName() != null &&
AttitudeEntryKey.valueOf(token.getName()).process(token, context, currentEntry);
} catch (IllegalArgumentException iae) {
// token has not been recognized
return false;
}
}
}