Merge branch 'master' into bael-16656

httpclient-simple/src/test/java/com/baeldung/httpclient/ProgressEntityWrapper.java

@@ -0,0 +1,58 @@
+package com.baeldung.httpclient;
+
+import java.io.FilterOutputStream;
+import java.io.IOException;
+import java.io.OutputStream;
+
+import org.apache.http.HttpEntity;
+import org.apache.http.entity.HttpEntityWrapper;
+
+public class ProgressEntityWrapper extends HttpEntityWrapper {
+    private final ProgressListener listener;
+
+    ProgressEntityWrapper(final HttpEntity entity, final ProgressListener listener) {
+        super(entity);
+        this.listener = listener;
+    }
+
+    @Override
+    public void writeTo(final OutputStream outstream) throws IOException {
+        super.writeTo(new CountingOutputStream(outstream, listener, getContentLength()));
+    }
+
+    public interface ProgressListener {
+        void progress(float percentage);
+    }
+
+    public static class CountingOutputStream extends FilterOutputStream {
+
+        private final ProgressListener listener;
+        private long transferred;
+        private long totalBytes;
+
+        CountingOutputStream(final OutputStream out, final ProgressListener listener, final long totalBytes) {
+            super(out);
+            this.listener = listener;
+            transferred = 0;
+            this.totalBytes = totalBytes;
+        }
+
+        @Override
+        public void write(final byte[] b, final int off, final int len) throws IOException {
+            out.write(b, off, len);
+            transferred += len;
+            listener.progress(getCurrentProgress());
+        }
+
+        @Override
+        public void write(final int b) throws IOException {
+            out.write(b);
+            transferred++;
+            listener.progress(getCurrentProgress());
+        }
+
+        private float getCurrentProgress() {
+            return ((float) transferred / totalBytes) * 100;
+        }
+    }
+}