Add and use StringUtils.isWhitespaceOrEmpty()

h2/src/main/org/h2/command/Parser.java

@@ -288,7 +288,7 @@ public class Parser {
             Command c = new CommandContainer(this, sql, p);
             if (hasMore) {
                 String remaining = originalSQL.substring(parseIndex);
-                if (remaining.trim().length() != 0) {
+                if (!StringUtils.isWhitespaceOrEmpty(remaining)) {
                     c = new CommandList(this, sql, c, remaining);
                 }
             }

h2/src/main/org/h2/command/dml/ScriptBase.java

@@ -29,6 +29,7 @@ import org.h2.store.fs.FileUtils;
 import org.h2.tools.CompressTool;
 import org.h2.util.IOUtils;
 import org.h2.util.SmallLRUCache;
+import org.h2.util.StringUtils;
 import org.h2.util.TempFileDeleter;
 import org.h2.value.CompareMode;
 
@@ -88,7 +89,7 @@ abstract class ScriptBase extends Prepared implements DataHandler {
     protected String getFileName() {
         if (fileNameExpr != null && fileName == null) {
             fileName = fileNameExpr.optimize(session).getValue(session).getString();
-            if (fileName == null || fileName.trim().length() == 0) {
+            if (fileName == null || StringUtils.isWhitespaceOrEmpty(fileName)) {
                 fileName = "script.sql";
             }
             fileName = SysProperties.getScriptDirectory() + fileName;

h2/src/main/org/h2/fulltext/FullText.java

@@ -596,7 +596,7 @@ public class FullText {
             // this is just to query the result set columns
             return result;
         }
-        if (text == null || text.trim().length() == 0) {
+        if (text == null || StringUtils.isWhitespaceOrEmpty(text)) {
             return result;
         }
         FullTextSettings setting = FullTextSettings.getInstance(conn);

h2/src/main/org/h2/fulltext/FullTextLucene.java

@@ -405,7 +405,7 @@ public class FullTextLucene extends FullText {
             // this is just to query the result set columns
             return result;
         }
-        if (text == null || text.trim().length() == 0) {
+        if (text == null || StringUtils.isWhitespaceOrEmpty(text)) {
             return result;
         }
         try {

h2/src/main/org/h2/server/web/WebThread.java

@@ -310,7 +310,7 @@ class WebThread extends WebApp implements Runnable {
                         }
                     }
                 }
-            } else if (line.trim().length() == 0) {
+            } else if (StringUtils.isWhitespaceOrEmpty(line)) {
                 break;
             }
         }

h2/src/main/org/h2/tools/RunScript.java

@@ -166,7 +166,7 @@ public class RunScript extends Tool {
             if (sql == null) {
                 break;
             }
-            if (sql.trim().length() == 0) {
+            if (StringUtils.isWhitespaceOrEmpty(sql)) {
                 continue;
             }
             boolean resultSet = stat.execute(sql);

h2/src/main/org/h2/tools/Shell.java

@@ -445,7 +445,7 @@ public class Shell extends Tool implements Runnable {
     }
 
     private void execute(String sql) {
-        if (sql.trim().length() == 0) {
+        if (StringUtils.isWhitespaceOrEmpty(sql)) {
             return;
         }
         long time = System.nanoTime();

h2/src/main/org/h2/util/StringUtils.java

@@ -980,6 +980,22 @@ public class StringUtils {
         return true;
     }
 
+    /**
+     * Check if the specified string is empty or contains only whitespace.
+     *
+     * @param s
+     *            the string
+     * @return whether the specified string is empty or contains only whitespace
+     */
+    public static boolean isWhitespaceOrEmpty(String s) {
+        for (int i = 0, l = s.length(); i < l; i++) {
+            if (s.charAt(i) > ' ') {
+                return false;
+            }
+        }
+        return true;
+    }
+
     /**
      * Append a zero-padded number to a string builder.
      *