Fix some IDE warnings, make lock-objects final, use generics, remove unused allocated fields to reduce memory overhead of DocumentInputStream

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1877818 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/hpsf/PropertySet.java

@@ -379,8 +379,7 @@ public class PropertySet {
      * stream, else {@code false}.
      * @exception IOException if an I/O error occurs
      */
-    public static boolean isPropertySetStream(final InputStream stream)
-    throws IOException {
+    public static boolean isPropertySetStream(final InputStream stream) throws IOException {
         /*
          * Read at most this many bytes.
          */

src/java/org/apache/poi/poifs/common/POIFSConstants.java

@@ -15,7 +15,7 @@
    See the License for the specific language governing permissions and
    limitations under the License.
 ==================================================================== */
-        
+
 
 package org.apache.poi.poifs.common;
 
@@ -25,43 +25,43 @@ package org.apache.poi.poifs.common;
 public interface POIFSConstants
 {
     /** Most files use 512 bytes as their big block size */
-    public static final int SMALLER_BIG_BLOCK_SIZE = 0x0200;
-    public static final POIFSBigBlockSize SMALLER_BIG_BLOCK_SIZE_DETAILS = 
+    int SMALLER_BIG_BLOCK_SIZE = 0x0200;
+    POIFSBigBlockSize SMALLER_BIG_BLOCK_SIZE_DETAILS =
        new POIFSBigBlockSize(SMALLER_BIG_BLOCK_SIZE, (short)9);
     /** Some use 4096 bytes */
-    public static final int LARGER_BIG_BLOCK_SIZE = 0x1000;
-    public static final POIFSBigBlockSize LARGER_BIG_BLOCK_SIZE_DETAILS = 
+    int LARGER_BIG_BLOCK_SIZE = 0x1000;
+    POIFSBigBlockSize LARGER_BIG_BLOCK_SIZE_DETAILS =
        new POIFSBigBlockSize(LARGER_BIG_BLOCK_SIZE, (short)12);
-    
+
     /** How big a block in the small block stream is. Fixed size */
-    public static final int SMALL_BLOCK_SIZE = 0x0040; 
-    
+    int SMALL_BLOCK_SIZE = 0x0040;
+
     /** How big a single property is */
-    public static final int PROPERTY_SIZE  = 0x0080;
-    
-    /** 
-     * The minimum size of a document before it's stored using 
-     *  Big Blocks (normal streams). Smaller documents go in the 
+    int PROPERTY_SIZE  = 0x0080;
+
+    /**
+     * The minimum size of a document before it's stored using
+     *  Big Blocks (normal streams). Smaller documents go in the
      *  Mini Stream (SBAT / Small Blocks)
      */
-    public static final int BIG_BLOCK_MINIMUM_DOCUMENT_SIZE = 0x1000;
-    
+    int BIG_BLOCK_MINIMUM_DOCUMENT_SIZE = 0x1000;
+
     /** The highest sector number you're allowed, 0xFFFFFFFA */
-    public static final int LARGEST_REGULAR_SECTOR_NUMBER = -5;
-    
+    int LARGEST_REGULAR_SECTOR_NUMBER = -5;
+
     /** Indicates the sector holds a DIFAT block (0xFFFFFFFC) */
-    public static final int DIFAT_SECTOR_BLOCK   = -4;
+    int DIFAT_SECTOR_BLOCK   = -4;
     /** Indicates the sector holds a FAT block (0xFFFFFFFD) */
-    public static final int FAT_SECTOR_BLOCK   = -3;
+    int FAT_SECTOR_BLOCK   = -3;
     /** Indicates the sector is the end of a chain (0xFFFFFFFE) */
-    public static final int END_OF_CHAIN   = -2;
+    int END_OF_CHAIN   = -2;
     /** Indicates the sector is not used (0xFFFFFFFF) */
-    public static final int UNUSED_BLOCK   = -1;
-    
+    int UNUSED_BLOCK   = -1;
+
     /** The first 4 bytes of an OOXML file, used in detection */
-    public static final byte[] OOXML_FILE_HEADER = 
+    byte[] OOXML_FILE_HEADER =
     	new byte[] { 0x50, 0x4b, 0x03, 0x04 };
     /** The first 5 bytes of a raw XML file, used in detection */
-    public static final byte[] RAW_XML_FILE_HEADER =
+    byte[] RAW_XML_FILE_HEADER =
         new byte[] { 0x3c, 0x3f, 0x78, 0x6d, 0x6c };
 }   // end public interface POIFSConstants;

src/java/org/apache/poi/poifs/filesystem/DocumentInputStream.java

@@ -36,11 +36,6 @@ import org.apache.poi.util.LittleEndianInput;
  * {@link POIFSFileSystem} instance.
  */
 public final class DocumentInputStream extends InputStream implements LittleEndianInput {
-
-    private static int SKIP_BUFFER_SIZE = 2048;
-
-    private static byte[] SKIP_BYTE_BUFFER = new byte[SKIP_BUFFER_SIZE];
-
     /** returned by read operations if we're at end of document */
     private static final int EOF = -1;
 

src/java/org/apache/poi/ss/formula/functions/DateValue.java

@@ -101,10 +101,10 @@ public class DateValue extends Fixed1ArgFunction {
                         groups.add(matchResult.group(i));
                     }
                     int year = format.hasYear
-                            ? Integer.valueOf(groups.get(format.yearIndex))
+                            ? Integer.parseInt(groups.get(format.yearIndex))
                             : LocalDate.now(LocaleUtil.getUserTimeZone().toZoneId()).getYear();
                     int month = parseMonth(groups.get(format.monthIndex));
-                    int day = Integer.valueOf(groups.get(format.dayIndex));
+                    int day = Integer.parseInt(groups.get(format.dayIndex));
                     return new NumberEval(DateUtil.getExcelDate(LocalDate.of(year, month, day)));
 
                 }
@@ -120,7 +120,7 @@ public class DateValue extends Fixed1ArgFunction {
 
     private int parseMonth(String monthPart) {
         try {
-            return Integer.valueOf(monthPart);
+            return Integer.parseInt(monthPart);
         } catch (NumberFormatException ignored) {
         }
 

src/java/org/apache/poi/ss/usermodel/WorkbookFactory.java

@@ -53,8 +53,9 @@ public abstract class WorkbookFactory {
         Workbook apply(T t, U u) throws IOException;
     }
 
-    private static Object hssfLock = new Object();
-    private static Object xssfLock = new Object();
+    private static final Object hssfLock = new Object();
+    private static final Object xssfLock = new Object();
+
     protected static CreateWorkbook0 createHssfFromScratch;
     protected static CreateWorkbook1<DirectoryNode> createHssfByNode;
 
@@ -338,7 +339,7 @@ public abstract class WorkbookFactory {
             synchronized (xssfLock) {
                 if (createXssfFromScratch == null) {
                     String factoryClass = "org.apache.poi.xssf.usermodel.XSSFWorkbookFactory";
-                    Class cls = initFactory(factoryClass, "poi-ooxml-*.jar");
+                    Class<?> cls = initFactory(factoryClass, "poi-ooxml-*.jar");
                     try {
                         cls.getMethod("init").invoke(null);
                     } catch (Exception e) {
@@ -355,7 +356,7 @@ public abstract class WorkbookFactory {
             synchronized (hssfLock) {
                 if (createHssfFromScratch == null) {
                     String factoryClass = "org.apache.poi.hssf.usermodel.HSSFWorkbookFactory";
-                    Class cls = initFactory(factoryClass, "poi-*.jar");
+                    Class<?> cls = initFactory(factoryClass, "poi-*.jar");
                     try {
                         cls.getMethod("init").invoke(null);
                     } catch (Exception e) {
@@ -366,7 +367,7 @@ public abstract class WorkbookFactory {
         }
     }
 
-    private static Class initFactory(String factoryClass, String jar) throws IOException {
+    private static Class<?> initFactory(String factoryClass, String jar) throws IOException {
         try {
             return Class.forName(factoryClass, true, WorkbookFactory.class.getClassLoader());
         } catch (ClassNotFoundException e) {