X-Git-Url: https://gitweb.fperrin.net/?p=GpsPrune.git;a=blobdiff_plain;f=src%2Ftim%2Fprune%2Fload%2Fjson%2FJsonFileLoader.java;fp=src%2Ftim%2Fprune%2Fload%2Fjson%2FJsonFileLoader.java;h=e1df6665fa20c1239057c783b0a16a3617669398;hp=0000000000000000000000000000000000000000;hb=cd5dd0c207b676067e85e0885b90f05445b7e229;hpb=1db53356139320890a8d10e982865a1899e11b81

diff --git a/src/tim/prune/load/json/JsonFileLoader.java b/src/tim/prune/load/json/JsonFileLoader.java
new file mode 100644
index 0000000..e1df666
--- /dev/null
+++ b/src/tim/prune/load/json/JsonFileLoader.java
@@ -0,0 +1,170 @@
+package tim.prune.load.json;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Stack;
+
+import tim.prune.App;
+import tim.prune.data.Field;
+import tim.prune.data.SourceInfo;
+
+
+/**
+ * Class to handle the loading of GeoJSON files
+ */
+public class JsonFileLoader
+{
+	/** App for callback of file loading */
+	private App _app = null;
+	/** Stack of blocks */
+	private Stack<JsonBlock> _jsonBlocks = null;
+	/** List of points extracted */
+	private ArrayList<JsonPoint> _jsonPoints = null;
+	private boolean _newSegment = true;
+
+
+	/**
+	 * Constructor
+	 * @param inApp App object
+	 */
+	public JsonFileLoader(App inApp)
+	{
+		_app = inApp;
+		_jsonBlocks = new Stack<JsonBlock>();
+		_jsonPoints = new ArrayList<JsonPoint>();
+	}
+
+	/**
+	 * Open the selected file
+	 * @param inFile File to open
+	 */
+	public void openFile(File inFile)
+	{
+		BufferedReader reader = null;
+		try
+		{
+			reader = new BufferedReader(new FileReader(inFile));
+			String currLine = reader.readLine();
+			while (currLine != null)
+			{
+				processTokensInLine(currLine);
+				// Read next line, if any
+				currLine = reader.readLine();
+			}
+		}
+		catch (IOException ioe) {
+			_app.showErrorMessage("error.load.dialogtitle", "error.load.noread");
+		}
+		finally
+		{
+			// close file ignoring errors
+			try {
+				if (reader != null) reader.close();
+			}
+			catch (Exception e) {}
+		}
+		if (_jsonPoints.size() > 0)
+		{
+			Field[] fields = {Field.LATITUDE, Field.LONGITUDE, Field.ALTITUDE,
+				Field.NEW_SEGMENT};
+			_app.informDataLoaded(fields, makeDataArray(),
+				null, new SourceInfo(inFile, SourceInfo.FILE_TYPE.JSON), null);
+		}
+		// TODO: Show message if nothing was found?
+	}
+
+	/** Split the given line from the json into tokens
+	 *  and process them one by one */
+	private void processTokensInLine(String inLine)
+	{
+		if (inLine == null) {return;}
+		String line = inLine.strip();
+		StringBuilder currToken = new StringBuilder();
+		boolean insideQuotes = false;
+		boolean previousSlash = false;
+		for (char x : line.toCharArray())
+		{
+			if (insideQuotes || x=='"') {
+				currToken.append(x);
+			}
+			else
+			{
+				if (" :,".indexOf(x) >= 0) {
+					processToken(currToken.toString());
+					currToken.setLength(0);
+				}
+				else if ("[{".indexOf(x) >= 0) {
+					// start of a new block
+					_jsonBlocks.add(new JsonBlock());
+				}
+				else if ("]}".indexOf(x) >= 0)
+				{
+					processToken(currToken.toString());
+					currToken.setLength(0);
+					// end of the current block
+					processBlock(_jsonBlocks.pop());
+				}
+				else {
+					currToken.append(x);
+				}
+			}
+			if (x == '"' && !previousSlash) {insideQuotes = !insideQuotes;}
+			previousSlash = (x == '\\') && !previousSlash;
+		}
+		processToken(currToken.toString());
+	}
+
+	private void processToken(String inToken)
+	{
+		if (inToken == null || inToken.isBlank()) {return;}
+		if (inToken.equals("\"coordinates\"")) {
+			_newSegment = true;
+		}
+		_jsonBlocks.peek().addToken(inToken);
+	}
+
+	/** Process the end of the given block */
+	private void processBlock(JsonBlock inBlock)
+	{
+		if (inBlock.areFieldsValid())
+		{
+			_jsonPoints.add(inBlock.createSinglePoint(_newSegment));
+			_newSegment = false;
+		}
+		else if (inBlock.areSingleCoordsValid())
+		{
+			// block contains a single point - pass to parent list
+			_jsonBlocks.peek().addSingleCoordsFrom(inBlock);
+		}
+		else if (inBlock.isCoordListValid())
+		{
+			// block contains a list of point coords
+			_jsonBlocks.peek().addCoordListFrom(inBlock);
+		}
+		else if (inBlock.hasValidCoordList())
+		{
+			for (int i=0; i<inBlock.getNumPoints(); i++)
+			{
+				_jsonPoints.add(inBlock.createPointFromList(i));
+			}
+			_newSegment = true;
+		}
+	}
+
+	/**
+	 * Make an object array from the data list
+	 * @return object array for loading
+	 */
+	private Object[][] makeDataArray()
+	{
+		Object[][] result = new Object[_jsonPoints.size()][];
+		for (int i=0; i<_jsonPoints.size(); i++) {
+			JsonPoint point = _jsonPoints.get(i);
+			result[i] = new String[] {point._latitude, point._longitude, point._altitude, point._newSegment?"1":"0"};
+		}
+		return result;
+	}
+}