add closeQuietly util method

git-svn-id: https://svn.code.sf.net/p/jackcess/code/jackcess/trunk@796 f203690c-595d-4dc9-a70b-905162fa7fd2

src/main/java/com/healthmarketscience/jackcess/impl/ByteUtil.java

@@ -27,6 +27,7 @@ King of Prussia, PA 19406
 
 package com.healthmarketscience.jackcess.impl;
 
+import java.io.Closeable;
 import java.io.FileWriter;
 import java.io.IOException;
 import java.io.OutputStream;
@@ -607,6 +608,17 @@ public final class ByteUtil {
     return newArr;
   }
 
+  /**
+   * Closes the given Closeable if non-null, swallows any IOExceptions.
+   */
+  public static void closeQuietly(Closeable c) {
+    if(c != null) {
+      try {
+        c.close();
+      } catch(IOException ignored) {}
+    }
+  }
+
   /**
    * Utility byte stream similar to ByteArrayOutputStream but with extended
    * accessibility to the bytes.

src/main/java/com/healthmarketscience/jackcess/impl/DatabaseImpl.java

@@ -391,11 +391,7 @@ public class DatabaseImpl implements Database
     } finally {
       if(!success && closeChannel) {
         // something blew up, shutdown the channel (quietly)
-        try {
-          channel.close();
-        } catch(Exception ignored) {
-          // we don't care
-        }
+        ByteUtil.closeQuietly(channel);
       }
     }
   }
@@ -449,11 +445,7 @@ public class DatabaseImpl implements Database
     } finally {
       if(!success && closeChannel) {
         // something blew up, shutdown the channel (quietly)
-        try {
-          channel.close();
-        } catch(Exception ignored) {
-          // we don't care
-        }
+        ByteUtil.closeQuietly(channel);
       }
     }
   }

src/main/java/com/healthmarketscience/jackcess/impl/GeneralLegacyIndexCodes.java

@@ -347,13 +347,7 @@ public class GeneralLegacyIndexCodes {
       throw new RuntimeException("failed loading index codes file " +
                                  codesFilePath, e);
     } finally {
-      if (reader != null) {
-        try {
-          reader.close();
-        } catch (IOException ex) {
-          // ignored
-        }
-      }
+      ByteUtil.closeQuietly(reader);
     }
 
     return values;

src/main/java/com/healthmarketscience/jackcess/impl/complex/AttachmentColumnInfoImpl.java

@@ -404,13 +404,7 @@ public class AttachmentColumnInfoImpl extends ComplexColumnInfoImpl<Attachment>
         return tmpBytes;
 
       } finally {
-        if(contentStream != null) {
-          try {
-            contentStream.close();
-          } catch(IOException e) {
-            // ignored
-          }
-        }
+        ByteUtil.closeQuietly(contentStream);
       }
     }
 
@@ -465,15 +459,9 @@ public class AttachmentColumnInfoImpl extends ComplexColumnInfoImpl<Attachment>
         return dataStream.toByteArray();
 
       } finally {
-        if(contentStream != null) {
-          try {
-            contentStream.close();
-          } catch(IOException e) {
-            // ignored
-          }
-        }
+        ByteUtil.closeQuietly(contentStream);
         if(deflater != null) {
-            deflater.end();
+          deflater.end();
         }
       }
     }

src/main/java/com/healthmarketscience/jackcess/util/ExportUtil.java

@@ -220,13 +220,7 @@ public class ExportUtil {
       exportWriter(db, tableName, out, header, delim, quote, filter);
       out.close();
     } finally {
-      if (out != null) {
-        try {
-          out.close();
-        } catch (Exception ex) {
-          LOG.warn("Could not close file " + f.getAbsolutePath(), ex);
-        }
-      }
+      ByteUtil.closeQuietly(out);
     }
   }
 

src/main/java/com/healthmarketscience/jackcess/util/ImportUtil.java

@@ -46,6 +46,7 @@ import com.healthmarketscience.jackcess.DataType;
 import com.healthmarketscience.jackcess.Database;
 import com.healthmarketscience.jackcess.Table;
 import com.healthmarketscience.jackcess.TableBuilder;
+import com.healthmarketscience.jackcess.impl.ByteUtil;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 
@@ -315,13 +316,7 @@ public class ImportUtil
       return importReader(in, db, name, delim, quote, filter, 
                           useExistingTable, header);
     } finally {
-      if (in != null) {
-        try {
-          in.close();
-        } catch (IOException ex) {
-          LOG.warn("Could not close file " + f.getAbsolutePath(), ex);
-        }
-      }
+      ByteUtil.closeQuietly(in);
     }
   }