wcsdescribecoverageparser.java

esri的ArcGIS Server超级学习模板程序（for java）

/**
 * 
 */
package com.esri.solutions.jitk.datasources.ogc.wcs.parsing.version110;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.xml.sax.Attributes;
import org.xml.sax.SAXException;

import com.esri.solutions.jitk.datasources.exceptions.ResponseParsingException;
import com.esri.solutions.jitk.datasources.ogc.wcs.Val;
import com.esri.solutions.jitk.datasources.ogc.wcs.info.OGCCRS;
import com.esri.solutions.jitk.datasources.ogc.wcs.info.WCSCoverageInfo;
import com.esri.solutions.jitk.datasources.ogc.wcs.info.WCSEnvelope;
import com.esri.solutions.jitk.datasources.ogc.wcs.parsing.WCSParserBase;

/**
 * @author vlad2928
 *
 */
public class WCSDescribeCoverageParser extends WCSParserBase {

	private List<WCSCoverageInfo> _coverageInfos;
	private WCSCoverageInfo _coverageInfo;
	
	private boolean _doCoverageDescriptions;
	private boolean _doCoverageDescription;
	private boolean _doKeywords;
	private boolean _doDomain;
	private boolean _doSpatialDomain;
	private boolean _doRange;
	
	private String _version;
	private WCSEnvelope _bbox;

	public WCSDescribeCoverageParser() {
		this.version = "1.1.0";
	}
	
	/* (non-Javadoc)
	 * @see com.esri.solutions.jitk.datasources.ogc.wcs.xml.parsing.IWCSCapabilitiesParser#parse(java.io.InputStream)
	 */
	public List<WCSCoverageInfo> parse(InputStream is) throws ResponseParsingException {
		super.parse(is, this);
		return _coverageInfos;
	}
	
	@Override
	public void startDocument() throws SAXException {
		_doCoverageDescriptions = _doCoverageDescription = _doKeywords = _doDomain = _doSpatialDomain = _doRange = false;
		_version = "";
		_bbox = null;
		_characters = null;
		_coverageInfos = null;
		_coverageInfo = null;
	}

	@Override
	public void startElement(String uri, String localName, String name, Attributes atts) throws SAXException {
		
		String sTagName = name.replaceFirst("^\\w*:", "");
		
		if(_doCoverageDescriptions) {
			doCoverageDescriptions(sTagName, atts);
		}
		
		if(sTagName.equalsIgnoreCase("CoverageDescriptions")) {
			_doCoverageDescriptions = (Val.chkStr(atts.getValue("xmlns")).indexOf("http://www.opengis.net/wcs/1.1") != -1);
			
			if(_doCoverageDescriptions) {
				_coverageInfos = new ArrayList<WCSCoverageInfo>();
				
			} else {
				throw new SAXException(this.getClass().getName() + " can not parse WCS DescribeCoverage response ver. " + _version + ". Incompatible version.");
			}
		}
	}
	
	private void doCoverageDescriptions(String name, Attributes atts) {
		
		if(_doCoverageDescription) {
			doCoverageDescription(name, atts);
		
		} else if(name.equalsIgnoreCase("CoverageDescription")) {
			_coverageInfo = new WCSCoverageInfo();
			_doCoverageDescription = true;
		}
	}
	
	private void doCoverageDescription(String name, Attributes atts) {
		
		_characters = new StringBuffer();
		
		if(_doDomain) {
			doDomain(name, atts);
			
		} else if(_doRange) {
			doRange(name, atts);
			
		} else if(name.equalsIgnoreCase("keywords")) {
			_doKeywords = true;
		
		} else if(name.equalsIgnoreCase("Domain")) {
			_doDomain = true;
			
		} else if(name.equalsIgnoreCase("Range")) {
			_doRange = true;	
		}
	}
	
	private void doDomain(String name, Attributes atts) {
		if(_doSpatialDomain) {
			doSpatialDomain(name, atts);
			
		} else if(name.equalsIgnoreCase("SpatialDomain")) {
			_doSpatialDomain = true;
		}
	}
	
	private void doSpatialDomain(String name, Attributes atts) {
		
		if(name.equalsIgnoreCase("BoundingBox")) {
			OGCCRS crs = new OGCCRS(Val.chkStr(atts.getValue("crs")));
			
			if(!crs.getCode().equalsIgnoreCase("imageCRS")) {
				_bbox = new WCSEnvelope();
				_bbox.setCRS(crs.toString());
				_coverageInfo.getSpatialDomain().setDimension(Val.chkInt(atts.getValue("dimension"), 2));
			}
		}
	}

	private void doRange(String name, Attributes atts) {}

	@Override
	public void endElement(String uri, String localName, String name) throws SAXException {
		
		String sTagName = name.replaceFirst("^\\w*:", "");
		
		if(_doCoverageDescription) {
			
			if(_doDomain) {
				
				if(_doSpatialDomain) {
					
					if(_bbox != null && sTagName.equalsIgnoreCase("LowerCorner")) {
						String[] coords = _characters.toString().split(" ");
						if(coords.length == 2) {
							_bbox.setMinX(Val.chkDbl(coords[0], Double.NaN));
							_bbox.setMinY(Val.chkDbl(coords[1], Double.NaN));
						}
						
					} else if(_bbox != null && sTagName.equalsIgnoreCase("UpperCorner")) {
						String[] coords = _characters.toString().split(" ");
						if(coords.length == 2) {
							_bbox.setMaxX(Val.chkDbl(coords[0], Double.NaN));
							_bbox.setMaxY(Val.chkDbl(coords[1], Double.NaN));
						}
						
					} else if(_bbox != null && sTagName.equalsIgnoreCase("BoundingBox")) {
						_coverageInfo.getSpatialDomain().addEnvelope(_bbox);
						_bbox = null;
			
					} else if(sTagName.equalsIgnoreCase("GridBaseCRS")) {
						_coverageInfo.addNativeCRS(_characters.toString());
					
					} else if(sTagName.equalsIgnoreCase("SpatialDomain")) {
						_doSpatialDomain = false;
					}
					
				} else if(sTagName.equalsIgnoreCase("Domain")) {
					_doDomain = false;
				}
				
			} else if(_doRange) {
				
				if(sTagName.equalsIgnoreCase("Range")) {
					_doRange = false;
				}

			} else {
			
				if(sTagName.equalsIgnoreCase("Title")) {
					_coverageInfo.setLabel(_characters.toString());
				
				} else if(sTagName.equalsIgnoreCase("Abstract")) {
					_coverageInfo.setDescription(_characters.toString());
				
				} else if(sTagName.equalsIgnoreCase("Identifier")) {
					_coverageInfo.setId(_characters.toString());
				
				} else if(sTagName.equalsIgnoreCase("SupportedFormat")) {
					_coverageInfo.addSupportedFormat(_characters.toString());
					
				} else if(sTagName.equalsIgnoreCase("SupportedCRS")) {
					_coverageInfo.addRequestCRS(_characters.toString());
					_coverageInfo.addResponseCRS(_characters.toString());
				
				} else if(_doKeywords) {
				
					if(sTagName.equalsIgnoreCase("keyword")) {
						_coverageInfo.addKeyword(_characters.toString());
				
					} else if(sTagName.equalsIgnoreCase("keywords")) {
						_doKeywords = false;
					}
			
				} else if(sTagName.equalsIgnoreCase("Domain")) {
					_doDomain = false;
				
				} else if(sTagName.equalsIgnoreCase("Range")) {
					_doRange = false;
				
				} else if(sTagName.equalsIgnoreCase("CoverageDescription")) {
					_coverageInfos.add(_coverageInfo);
					_coverageInfo = null;
					_doCoverageDescription = false;
				}
			}
		}
	}
}