ApmParser.java
/* Copyright 2002-2021 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.apm;
import java.util.ArrayList;
import java.util.List;
import org.orekit.data.DataContext;
import org.orekit.files.ccsds.ndm.ParsedUnitsBehavior;
import org.orekit.files.ccsds.ndm.adm.AdmMetadata;
import org.orekit.files.ccsds.ndm.adm.AdmMetadataKey;
import org.orekit.files.ccsds.ndm.adm.AdmParser;
import org.orekit.files.ccsds.section.CommentsContainer;
import org.orekit.files.ccsds.section.Header;
import org.orekit.files.ccsds.section.HeaderProcessingState;
import org.orekit.files.ccsds.section.MetadataKey;
import org.orekit.files.ccsds.section.Segment;
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.ErrorState;
import org.orekit.files.ccsds.utils.parsing.ProcessingState;
import org.orekit.time.AbsoluteDate;
import org.orekit.utils.IERSConventions;
/**
* A parser for the CCSDS APM (Attitude Parameter Message).
* @author Bryan Cazabonne * <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>
* @since 10.2
*/
public class ApmParser extends AdmParser<Apm, ApmParser> {
/** File header. */
private Header header;
/** File segments. */
private List<Segment<AdmMetadata, ApmData>> segments;
/** APM metadata being read. */
private AdmMetadata metadata;
/** Context binding valid for current metadata. */
private ContextBinding context;
/** APM general comments block being read. */
private CommentsContainer commentsBlock;
/** APM quaternion logical block being read. */
private ApmQuaternion quaternionBlock;
/** APM Euler angles logical block being read. */
private Euler eulerBlock;
/** APM spin-stabilized logical block being read. */
private SpinStabilized spinStabilizedBlock;
/** APM spacecraft parameters logical block being read. */
private SpacecraftParameters spacecraftParametersBlock;
/** Current maneuver. */
private Maneuver currentManeuver;
/** All maneuvers. */
private List<Maneuver> maneuvers;
/** Processor for global message structure. */
private ProcessingState structureProcessor;
/** Complete constructor.
* <p>
* Calling this constructor directly is not recommended. Users should rather use
* {@link org.orekit.files.ccsds.ndm.ParserBuilder#buildApmParser()
* parserBuilder.buildApmParser()}.
* </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 parsedUnitsBehavior behavior to adopt for handling parsed units
*/
public ApmParser(final IERSConventions conventions, final boolean simpleEOP, final DataContext dataContext,
final AbsoluteDate missionReferenceDate, final ParsedUnitsBehavior parsedUnitsBehavior) {
super(Apm.ROOT, Apm.FORMAT_VERSION_KEY, conventions, simpleEOP, dataContext,
missionReferenceDate, parsedUnitsBehavior);
}
/** {@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;
quaternionBlock = null;
eulerBlock = null;
spinStabilizedBlock = null;
spacecraftParametersBlock = null;
currentManeuver = null;
maneuvers = new ArrayList<>();
if (fileFormat == FileFormat.XML) {
structureProcessor = new XmlStructureProcessingState(Apm.ROOT, this);
reset(fileFormat, structureProcessor);
} else {
structureProcessor = new ErrorState(); // should never be called
reset(fileFormat, new HeaderProcessingState(this));
}
}
/** {@inheritDoc} */
@Override
public boolean prepareHeader() {
anticipateNext(new HeaderProcessingState(this));
return true;
}
/** {@inheritDoc} */
@Override
public boolean inHeader() {
anticipateNext(getFileFormat() == FileFormat.XML ? structureProcessor : this::processMetadataToken);
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 AdmMetadata();
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::processGeneralCommentToken);
return true;
}
/** {@inheritDoc} */
@Override
public boolean finalizeMetadata() {
metadata.validate(header.getFormatVersion());
return true;
}
/** {@inheritDoc} */
@Override
public boolean prepareData() {
commentsBlock = new CommentsContainer();
anticipateNext(getFileFormat() == FileFormat.XML ? this::processXmlSubStructureToken : this::processGeneralCommentToken);
return true;
}
/** {@inheritDoc} */
@Override
public boolean inData() {
return true;
}
/** {@inheritDoc} */
@Override
public boolean finalizeData() {
if (metadata != null) {
final ApmData data = new ApmData(commentsBlock, quaternionBlock, eulerBlock,
spinStabilizedBlock, spacecraftParametersBlock);
for (final Maneuver maneuver : maneuvers) {
data.addManeuver(maneuver);
}
data.validate(header.getFormatVersion());
segments.add(new Segment<>(metadata, data));
}
metadata = null;
context = null;
quaternionBlock = null;
eulerBlock = null;
spinStabilizedBlock = null;
spacecraftParametersBlock = null;
currentManeuver = null;
return true;
}
/** {@inheritDoc} */
@Override
public Apm build() {
// APM KVN file lack a DATA_STOP keyword, hence we can't call finalizeData()
// automatically before the end of the file
finalizeData();
final Apm file = new Apm(header, segments, getConventions(), getDataContext());
return file;
}
/** Add a general comment.
* @param comment comment to add
* @return always return true
*/
boolean addGeneralComment(final String comment) {
return commentsBlock.addComment(comment);
}
/** Manage quaternion section.
* @param starting if true, parser is entering the section
* otherwise it is leaving the section
* @return always return true
*/
boolean manageQuaternionSection(final boolean starting) {
anticipateNext(starting ? this::processQuaternionToken : structureProcessor);
return true;
}
/** Manage Euler elements / three axis stabilized section.
* @param starting if true, parser is entering the section
* otherwise it is leaving the section
* @return always return true
*/
boolean manageEulerElementsThreeSection(final boolean starting) {
anticipateNext(starting ? this::processEulerToken : structureProcessor);
return true;
}
/** Manage Euler elements /spin stabilized section.
* @param starting if true, parser is entering the section
* otherwise it is leaving the section
* @return always return true
*/
boolean manageEulerElementsSpinSection(final boolean starting) {
anticipateNext(starting ? this::processSpinStabilizedToken : structureProcessor);
return true;
}
/** Manage spacecraft parameters section.
* @param starting if true, parser is entering the section
* otherwise it is leaving the section
* @return always return true
*/
boolean manageSpacecraftParametersSection(final boolean starting) {
anticipateNext(starting ? this::processSpacecraftParametersToken : structureProcessor);
return true;
}
/** Manage maneuver parameters section.
* @param starting if true, parser is entering the section
* otherwise it is leaving the section
* @return always return true
*/
boolean manageManeuverParametersSection(final boolean starting) {
anticipateNext(starting ? this::processManeuverToken : structureProcessor);
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) {
if (metadata == null) {
// APM KVN file lack a META_START keyword, hence we can't call prepareMetadata()
// automatically before the first metadata token arrives
prepareMetadata();
}
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) {
// 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 comment token.
* @param token token to process
* @return true if token was processed, false otherwise
*/
private boolean processGeneralCommentToken(final ParseToken token) {
if (commentsBlock == null) {
// APM KVN file lack a META_STOP keyword, hence we can't call finalizeMetadata()
// automatically before the first data token arrives
finalizeMetadata();
// APM KVN file lack a DATA_START keyword, hence we can't call prepareData()
// automatically before the first data token arrives
prepareData();
}
anticipateNext(getFileFormat() == FileFormat.XML ? this::processXmlSubStructureToken : this::processQuaternionToken);
if ("COMMENT".equals(token.getName())) {
if (token.getType() == TokenType.ENTRY) {
commentsBlock.addComment(token.getContentAsNormalizedString());
}
return true;
} else {
return false;
}
}
/** Process one quaternion data token.
* @param token token to process
* @return true if token was processed, false otherwise
*/
private boolean processQuaternionToken(final ParseToken token) {
commentsBlock.refuseFurtherComments();
if (quaternionBlock == null) {
quaternionBlock = new ApmQuaternion();
}
anticipateNext(getFileFormat() == FileFormat.XML ? this::processXmlSubStructureToken : this::processEulerToken);
try {
return token.getName() != null &&
ApmQuaternionKey.valueOf(token.getName()).process(token, context, quaternionBlock);
} catch (IllegalArgumentException iae) {
// token has not been recognized
return false;
}
}
/** Process one Euler angles data token.
* @param token token to process
* @return true if token was processed, false otherwise
*/
private boolean processEulerToken(final ParseToken token) {
if (eulerBlock == null) {
eulerBlock = new Euler();
}
anticipateNext(getFileFormat() == FileFormat.XML ? this::processXmlSubStructureToken : this::processSpinStabilizedToken);
try {
return token.getName() != null &&
EulerKey.valueOf(token.getName()).process(token, context, eulerBlock);
} catch (IllegalArgumentException iae) {
// token has not been recognized
return false;
}
}
/** Process one spin-stabilized data token.
* @param token token to process
* @return true if token was processed, false otherwise
*/
private boolean processSpinStabilizedToken(final ParseToken token) {
if (spinStabilizedBlock == null) {
spinStabilizedBlock = new SpinStabilized();
if (moveCommentsIfEmpty(eulerBlock, spinStabilizedBlock)) {
// get rid of the empty logical block
eulerBlock = null;
}
}
anticipateNext(getFileFormat() == FileFormat.XML ? this::processXmlSubStructureToken : this::processSpacecraftParametersToken);
try {
return token.getName() != null &&
SpinStabilizedKey.valueOf(token.getName()).process(token, context, spinStabilizedBlock);
} catch (IllegalArgumentException iae) {
// token has not been recognized
return false;
}
}
/** Process one spacecraft parameters data token.
* @param token token to process
* @return true if token was processed, false otherwise
*/
private boolean processSpacecraftParametersToken(final ParseToken token) {
if (spacecraftParametersBlock == null) {
spacecraftParametersBlock = new SpacecraftParameters();
if (moveCommentsIfEmpty(spinStabilizedBlock, spacecraftParametersBlock)) {
// get rid of the empty logical block
spinStabilizedBlock = null;
}
}
anticipateNext(getFileFormat() == FileFormat.XML ? this::processXmlSubStructureToken : this::processManeuverToken);
try {
return token.getName() != null &&
SpacecraftParametersKey.valueOf(token.getName()).process(token, context, spacecraftParametersBlock);
} catch (IllegalArgumentException iae) {
// token has not been recognized
return false;
}
}
/** Process one maneuver data token.
* @param token token to process
* @return true if token was processed, false otherwise
*/
private boolean processManeuverToken(final ParseToken token) {
if (currentManeuver == null) {
currentManeuver = new Maneuver();
if (moveCommentsIfEmpty(spacecraftParametersBlock, currentManeuver)) {
// get rid of the empty logical block
spacecraftParametersBlock = null;
}
}
anticipateNext(getFileFormat() == FileFormat.XML ? this::processXmlSubStructureToken : new ErrorState());
try {
if (token.getName() != null &&
ManeuverKey.valueOf(token.getName()).process(token, context, currentManeuver)) {
// the token was processed properly
if (currentManeuver.completed()) {
// current maneuver is completed
maneuvers.add(currentManeuver);
currentManeuver = null;
}
return true;
}
} catch (IllegalArgumentException iae) {
// ignored, delegate to next state below
}
// the token was not processed
return false;
}
/** Move comments from one empty logical block to another logical block.
* @param origin origin block
* @param destination destination block
* @return true if origin block was empty
*/
private boolean moveCommentsIfEmpty(final CommentsContainer origin, final CommentsContainer destination) {
if (origin != null && origin.acceptComments()) {
// origin block is empty, move the existing comments
for (final String comment : origin.getComments()) {
destination.addComment(comment);
}
return true;
} else {
return false;
}
}
}