X-Git-Url: https://gerrit.simantics.org/r/gitweb?p=simantics%2Fplatform.git;a=blobdiff_plain;f=bundles%2Forg.simantics.history%2Fsrc%2Forg%2Fsimantics%2Fhistory%2Futil%2FStreamIterator.java;fp=bundles%2Forg.simantics.history%2Fsrc%2Forg%2Fsimantics%2Fhistory%2Futil%2FStreamIterator.java;h=c30862af53c185dc2a1cbb52150f0b9e5704fcb4;hp=0000000000000000000000000000000000000000;hb=969bd23cab98a79ca9101af33334000879fb60c5;hpb=866dba5cd5a3929bbeae85991796acb212338a08

diff --git a/bundles/org.simantics.history/src/org/simantics/history/util/StreamIterator.java b/bundles/org.simantics.history/src/org/simantics/history/util/StreamIterator.java
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+/*******************************************************************************
+ * Copyright (c) 2007, 2012 Association for Decentralized Information Management in
+ * Industry THTH ry.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.history.util;
+
+import org.simantics.databoard.Bindings;
+import org.simantics.databoard.accessor.ArrayAccessor;
+import org.simantics.databoard.accessor.error.AccessorException;
+import org.simantics.databoard.binding.Binding;
+import org.simantics.databoard.binding.RecordBinding;
+import org.simantics.databoard.binding.error.BindingException;
+import org.simantics.history.HistoryException;
+
+/**
+ * Stream iterator iterates sample entries in an array.
+ * 
+ * Is scans the next sample and knows its time stamp.
+ * 
+ * @author toni.kalajainen
+ */
+public class StreamIterator {
+
+	// Sample binding
+	RecordBinding sampleBinding;
+	
+	// Array accessor
+	ArrayAccessor aa;
+	// Array stream
+	Stream stream;
+	// From and end times of the whole stream
+	double from, end;
+	
+	// Current and next sample
+	Object current, next;
+
+	// Utility for reading sample
+	ValueBand valueBand, nextValueBand;
+	// Start and end time of current sample
+	double startTime, endTime;
+	
+	int index = -1;
+	int size;
+	
+	public StreamIterator(ArrayAccessor aa) throws HistoryException {
+		try {
+			this.aa = aa;
+			sampleBinding = (RecordBinding) Bindings.getBeanBinding( aa.type().componentType );
+			current = sampleBinding.createDefault();
+			next = sampleBinding.createDefault();
+			valueBand = new ValueBand(sampleBinding, current);
+			nextValueBand = new ValueBand(sampleBinding, next);
+			stream = new Stream( aa, sampleBinding );
+			size = aa.size();
+			if ( size>0 ) {
+		    	aa.get(0, sampleBinding, current);
+				from = valueBand.getTimeDouble();
+		    	aa.get(size-1, sampleBinding, current);
+				end = valueBand.hasEndTime() ? valueBand.getEndTimeDouble() : valueBand.getTimeDouble();
+			}
+		} catch (BindingException e) {
+			throw new HistoryException( e );
+		} catch (AccessorException e) {
+			throw new HistoryException( e );
+		} 
+	}
+	
+	/**
+	 * Go to time using random access
+	 * @param time
+	 * @return true if sample was found
+	 * @throws HistoryException 
+	 */
+	public boolean gotoTime(double time) throws HistoryException {
+		// Outside range
+		if ( time<from || time>end ) {
+			index = -1;
+			return false;
+		}
+		
+		// Already at cursor
+		if ( time>=startTime && time<endTime ) return hasValue();
+		int i = stream.binarySearch(Bindings.DOUBLE, time);
+		if (i>=0) {
+			gotoIndex( i );
+		} else {
+			int insertPos = -i-2;
+			if ( insertPos<0 || insertPos>=size ) {
+				index = -1;
+			} else {
+				gotoIndex( insertPos );
+				if ( endTime<time ) index = -1;
+			}
+		}
+		
+		return hasValue();		
+	}
+	
+	/**
+	 * Proceed to time using sequential seek.
+	 * 
+	 * @param time
+	 * @return true if sample was found
+	 * @throws HistoryException 
+	 */
+	public boolean proceedToTime(double time) throws HistoryException {
+		// Outside range
+		if ( time<from || time>end ) {
+			index = -1;
+			return false;
+		}
+
+		// No position, or going to past
+		if (index<0 || startTime>time) {
+			gotoTime(time);
+			return hasValue();
+		}
+		
+		// Proceed until end hit
+		while (time>=endTime && hasNext()) gotoIndex(index+1);
+		return hasValue();
+	}
+	
+	/**
+	 * Go to index. If element does not exist, index is set to -1;
+	 * @param pos
+	 * @throws HistoryException
+	 */
+	public void gotoIndex(int pos) throws HistoryException {
+		if (pos == index) return;
+		
+		if (pos<0 || pos>=size) {
+			index = -1;
+			return;
+		}
+
+		try {
+			// Read current value
+			if (pos == index+1 && index>=0) {
+				sampleBinding.readFrom(sampleBinding, next, current);
+			} else {
+				aa.get(pos, sampleBinding, current);
+			}
+			startTime = valueBand.getTimeDouble();
+			
+			// Read next value
+			if (pos+1<size) {
+				aa.get(pos+1, sampleBinding, next);
+				//endTime = valueBand.isValidValue() ? nextValueBand.getTimeDouble() : ( nextValueBand.isValidValue() ? nextValueBand.getTimeDouble() : nextValueBand.getTimeDouble() );
+				endTime = nextValueBand.getTimeDouble();
+			} else {				
+				endTime = valueBand.hasEndTime() ? valueBand.getEndTimeDouble() : valueBand.getTimeDouble();
+			}
+			
+			// 
+			index = pos;
+		} catch (AccessorException e) {
+			throw new HistoryException( e );
+		} catch (BindingException e) {
+			throw new HistoryException( e );
+		}
+	}
+
+	
+	public boolean hasNext() {
+		return index<size-1;
+	}
+
+	public void next() throws HistoryException {
+		//if (index>=0) 
+		gotoIndex( index+1 );
+	}
+	
+	public ValueBand getValueBand() {
+		return valueBand;
+	}
+	
+	public Object getValue(Binding binding) throws HistoryException {
+		return valueBand.getValue(binding);
+	}
+	
+	public Object getSample() {
+		return current;
+	}
+	
+	public RecordBinding getSampleBinding() {
+		return sampleBinding;
+	}
+	
+	public boolean hasValue() {
+		return index!=-1;
+	}
+	
+	public boolean hasValidValue() throws HistoryException {
+		return index!=-1 && !valueBand.isNanSample() && !valueBand.isNullValue();
+	}
+	/**
+	 * Get the start time. The value is valid if index != -1
+	 * @return start time
+	 */
+	public double getStartTime() {
+		return startTime;
+	}
+	
+	/**
+	 * Get end time, the value is valid if index != -1
+	 * @return end time
+	 */
+	public double getEndTime() {
+		return endTime;
+	}
+	
+	public Double getNextTime() throws HistoryException {
+		if ( size==0 ) return null;
+		if ( index==-1 ) return from;
+		return (Double) nextValueBand.getTime(Bindings.DOUBLE);
+	}
+	
+	public Double getNextTime( double currentTime ) throws HistoryException {
+		if ( size==0 ) return null;
+		if ( index==-1 ) return from;
+		
+		if ( valueBand.hasEndTime() ) {
+			Double endTime = (Double) valueBand.getEndTime(Bindings.DOUBLE);
+			if ( endTime>currentTime ) return endTime;
+		}
+		
+		double nextTime = (Double) nextValueBand.getTime(Bindings.DOUBLE);
+		return nextTime;
+	}
+	
+	
+	
+	/**
+	 * get index of the cursor
+	 * @return index or -1
+	 */
+	public int getIndex() {
+		return index;
+	}
+	
+	@Override
+	public String toString() {
+		Binding valueBinding = valueBand.getValueBinding();
+		String valueStr;
+		try {
+			valueStr = valueBinding.toString( valueBand.getValue() );
+		} catch (BindingException e) {
+			valueStr = e.toString();
+		} catch (HistoryException e) {
+			valueStr = e.toString();
+		}
+		if ( hasValue() ) {
+			return "i="+index+", time=["+startTime+"-"+endTime+"], value="+valueStr;
+		} else {
+			return "<no value>";
+		}
+	}
+	
+	/**
+	 * Get start time of the first sample.
+	 * @return time
+	 */
+	public double getFirstTime() {
+		return from;
+	}
+	
+	/**
+	 * Get end time of the last sample.
+	 * @return time
+	 */
+	public double getLastTime() {
+		return end;
+	}
+	
+	public int size() {
+		return size;
+	}
+	
+	public boolean isEmpty() {
+		return size==0;
+	}
+	
+}