svn commit: r469271 - /lucene/java/trunk/src/test/org/apache/lucene/store/TestBufferedIndexInput.java

[yo...@apache.org]

Author: yonik
Date: Mon Oct 30 12:53:11 2006
New Revision: 469271

URL: http://svn.apache.org/viewvc?view=rev&rev=469271
Log:
new test: LUCENE-695

Added:
    lucene/java/trunk/src/test/org/apache/lucene/store/TestBufferedIndexInput.java   (with props)

Added: lucene/java/trunk/src/test/org/apache/lucene/store/TestBufferedIndexInput.java
URL: http://svn.apache.org/viewvc/lucene/java/trunk/src/test/org/apache/lucene/store/TestBufferedIndexInput.java?view=auto&rev=469271
==============================================================================
--- lucene/java/trunk/src/test/org/apache/lucene/store/TestBufferedIndexInput.java (added)
+++ lucene/java/trunk/src/test/org/apache/lucene/store/TestBufferedIndexInput.java Mon Oct 30 12:53:11 2006
@@ -0,0 +1,125 @@
+package org.apache.lucene.store;
+
+import java.io.IOException;
+
+import junit.framework.TestCase;
+
+public class TestBufferedIndexInput extends TestCase {
+	// Call readByte() repeatedly, past the buffer boundary, and see that it
+	// is working as expected.
+	// Our input comes from a dynamically generated/ "file" - see
+	// MyBufferedIndexInput below.
+    public void testReadByte() throws Exception {
+    	MyBufferedIndexInput input = new MyBufferedIndexInput(); 
+    	for(int i=0; i<BufferedIndexInput.BUFFER_SIZE*10; i++){
+     		assertEquals(input.readByte(), byten(i));
+    	}
+    }
+ 
+	// Call readBytes() repeatedly, with various chunk sizes (from 1 byte to
+    // larger than the buffer size), and see that it returns the bytes we expect.
+	// Our input comes from a dynamically generated "file" -
+    // see MyBufferedIndexInput below.
+    public void testReadBytes() throws Exception {
+    	MyBufferedIndexInput input = new MyBufferedIndexInput();
+    	int pos=0;
+    	// gradually increasing size:
+    	for(int size=1; size<BufferedIndexInput.BUFFER_SIZE*10; size=size+size/200+1){
+    		checkReadBytes(input, size, pos);
+    		pos+=size;
+    	}
+    	// wildly fluctuating size:
+    	for(long i=0; i<1000; i++){
+    		// The following function generates a fluctuating (but repeatable)
+    		// size, sometimes small (<100) but sometimes large (>10000)
+    		int size1 = (int)( i%7 + 7*(i%5)+ 7*5*(i%3) + 5*5*3*(i%2));
+    		int size2 = (int)( i%11 + 11*(i%7)+ 11*7*(i%5) + 11*7*5*(i%3) + 11*7*5*3*(i%2) );
+    		int size = (i%3==0)?size2*10:size1; 
+    		checkReadBytes(input, size, pos);
+    		pos+=size;
+    	}
+    	// constant small size (7 bytes):
+    	for(int i=0; i<BufferedIndexInput.BUFFER_SIZE; i++){
+    		checkReadBytes(input, 7, pos);
+    		pos+=7;
+    	}
+    }
+   private void checkReadBytes(BufferedIndexInput input, int size, int pos) throws IOException{
+	   // Just to see that "offset" is treated properly in readBytes(), we
+	   // add an arbitrary offset at the beginning of the array
+	   int offset = size % 10; // arbitrary
+	   byte[] b = new byte[offset+size];
+	   input.readBytes(b, offset, size);
+	   for(int i=0; i<size; i++){
+		   assertEquals(b[offset+i], byten(pos+i));
+	   }
+   }
+   
+   // This tests that attempts to readBytes() past an EOF will fail, while
+   // reads up to the EOF will succeed. The EOF is determined by the
+   // BufferedIndexInput's arbitrary length() value.
+   public void testEOF() throws Exception {
+	   MyBufferedIndexInput input = new MyBufferedIndexInput(1024);
+	   // see that we can read all the bytes at one go:
+	   checkReadBytes(input, (int)input.length(), 0);  
+	   // go back and see that we can't read more than that, for small and
+	   // large overflows:
+	   int pos = (int)input.length()-10;
+	   input.seek(pos);
+	   checkReadBytes(input, 10, pos);  
+	   input.seek(pos);
+	   try {
+		   checkReadBytes(input, 11, pos);
+           fail("Block read past end of file");
+       } catch (IOException e) {
+           /* success */
+       }
+	   input.seek(pos);
+	   try {
+		   checkReadBytes(input, 50, pos);
+           fail("Block read past end of file");
+       } catch (IOException e) {
+           /* success */
+       }
+	   input.seek(pos);
+	   try {
+		   checkReadBytes(input, 100000, pos);
+           fail("Block read past end of file");
+       } catch (IOException e) {
+           /* success */
+       }
+  }
+
+    // byten emulates a file - byten(n) returns the n'th byte in that file.
+    // MyBufferedIndexInput reads this "file".
+    private static byte byten(long n){
+    	return (byte)(n*n%256);
+    }
+    private static class MyBufferedIndexInput extends BufferedIndexInput {
+    	private long pos;
+    	private long len;
+    	public MyBufferedIndexInput(long len){
+    		this.len = len;
+    		this.pos = 0;
+    	}
+    	public MyBufferedIndexInput(){
+    		// an infinite file
+    		this(Long.MAX_VALUE);
+    	}
+		protected void readInternal(byte[] b, int offset, int length) throws IOException {
+			for(int i=offset; i<offset+length; i++)
+				b[i] = byten(pos++);
+		}
+
+		protected void seekInternal(long pos) throws IOException {
+			this.pos = pos;
+		}
+
+		public void close() throws IOException {
+		}
+
+		public long length() {
+			return len;
+		}
+    }
+}

Propchange: lucene/java/trunk/src/test/org/apache/lucene/store/TestBufferedIndexInput.java
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Propchange: lucene/java/trunk/src/test/org/apache/lucene/store/TestBufferedIndexInput.java
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