Updates pull request from Roman Tsypuk to convert the build system from

ant to gradle.  Removes linux and windows application launch scripts and
produces an executable jar with all resources included.

src/main/java/io/github/dsheirer/buffer/FloatCircularBuffer.java

@@ -0,0 +1,118 @@
+/*******************************************************************************
+ *     SDR Trunk 
+ *     Copyright (C) 2014 Dennis Sheirer
+ * 
+ *     This program is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ * 
+ *     This program is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *     GNU General Public License for more details.
+ * 
+ *     You should have received a copy of the GNU General Public License
+ *     along with this program.  If not, see <http://www.gnu.org/licenses/>
+ ******************************************************************************/
+package io.github.dsheirer.buffer;
+
+import java.util.Arrays;
+
+/**
+ * Circular sample buffer - allocates a buffer and stores samples in a circular
+ * fashion, overwriting older samples with newly arrived samples.  Initially
+ * fills buffer with 0-valued samples
+ * 
+ * Can be used as a delay-type buffer, to delay samples by the 'size' amount
+ * @author denny
+ *
+ */
+public class FloatCircularBuffer
+{
+	float[] mBuffer;
+	int mBufferPointer = 0;
+	
+	public FloatCircularBuffer( int size )
+	{
+		mBuffer = new float[ size ];
+		
+		Arrays.fill( mBuffer, (float)0.0 );
+	}
+	
+	public int getSize()
+	{
+		return mBuffer.length;
+	}
+	
+	public float[] getBuffer()
+	{
+		return mBuffer;
+	}
+
+	/**
+	 * Puts the new value into the buffer and returns the oldest buffer value
+	 * that it replaced
+	 * @param newValue
+	 * @return
+	 */
+	public float get( float newValue )
+	{
+		float oldestSample = mBuffer[ mBufferPointer ];
+
+		mBuffer[ mBufferPointer ] = newValue;
+		
+		mBufferPointer++;
+		
+		if( mBufferPointer >= mBuffer.length )
+		{
+			mBufferPointer = 0;
+		}
+		
+		return oldestSample;
+	}
+
+	/**
+	 * Convenience method to put a new value in the buffer, while discarding
+	 * the old value
+	 */
+	public void put( float newValue )
+	{
+		get( newValue );
+	}
+
+	/**
+	 * Returns an array of arraySize, loaded with sampleCount of the 
+	 * oldest samples, loaded into the array starting at index 0.
+	 * 
+	 * This is useful for fetching an array filled half way with samples to
+	 * use in FFT processing.
+	 * @param arraySize - size of the array (must be larger than sampleCount)
+	 * @param sampleCount - number of the oldest samples in the buffer to load
+	 * @return
+	 */
+	public float[] get( int arraySize, int sampleCount )
+	{
+		float[] samples = new float[ arraySize ];
+
+		if( arraySize > sampleCount )
+		{
+			int tempCounter = mBufferPointer;
+
+			for( int x = 0; x < sampleCount; x++ )
+			{
+				samples[ x ] = mBuffer[ tempCounter ];
+				
+				tempCounter++;
+				
+				if( tempCounter > mBuffer.length )
+				{
+					tempCounter = 0;
+				}
+			}
+		}
+		
+		return samples;
+	}
+	
+}