remove StringUtils.fromCacheOrNew

since we require Java7, this is no longer necessary

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

@@ -3267,7 +3267,7 @@ public class Parser {
                 }
                 i++;
             }
-            currentToken = StringUtils.fromCacheOrNew(sqlCommand.substring(
+            currentToken = StringUtils.cache(sqlCommand.substring(
                     start, i));
             currentTokenType = getTokenType(currentToken);
             parseIndex = i;
@@ -3290,7 +3290,7 @@ public class Parser {
                 }
                 i++;
             }
-            currentToken = StringUtils.fromCacheOrNew(result);
+            currentToken = StringUtils.cache(result);
             parseIndex = i;
             currentTokenQuoted = true;
             currentTokenType = IDENTIFIER;
@@ -3386,7 +3386,7 @@ public class Parser {
             }
             currentToken = "'";
             checkLiterals(true);
-            currentValue = ValueString.get(StringUtils.fromCacheOrNew(result),
+            currentValue = ValueString.get(StringUtils.cache(result),
                     database.getMode().treatEmptyStringsAsNull);
             parseIndex = i;
             currentTokenType = VALUE;
@@ -3401,7 +3401,7 @@ public class Parser {
             result = sqlCommand.substring(begin, i);
             currentToken = "'";
             checkLiterals(true);
-            currentValue = ValueString.get(StringUtils.fromCacheOrNew(result),
+            currentValue = ValueString.get(StringUtils.cache(result),
                     database.getMode().treatEmptyStringsAsNull);
             parseIndex = i;
             currentTokenType = VALUE;
@@ -4785,7 +4785,7 @@ public class Parser {
             Query withQuery = parseSelect();
             read(")");
             withQuery.prepare();
-            querySQL = StringUtils.fromCacheOrNew(withQuery.getPlanSQL());
+            querySQL = StringUtils.cache(withQuery.getPlanSQL());
             ArrayList<Expression> withExpressions = withQuery.getExpressions();
             for (int i = 0; i < cols.length; ++i) {
                 columnTemplates[i] = new Column(cols[i], withExpressions.get(i).getType());
@@ -4819,7 +4819,7 @@ public class Parser {
             String[] cols = parseColumnList();
             command.setColumnNames(cols);
         }
-        String select = StringUtils.fromCacheOrNew(sqlCommand
+        String select = StringUtils.cache(sqlCommand
                 .substring(parseIndex));
         read("AS");
         try {

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

@@ -9,7 +9,6 @@ import java.lang.ref.SoftReference;
 import java.net.URLEncoder;
 import java.util.ArrayList;
 import java.util.Locale;
-
 import org.h2.api.ErrorCode;
 import org.h2.engine.Constants;
 import org.h2.engine.SysProperties;
@@ -910,47 +909,6 @@ public class StringUtils {
         return s;
     }
 
-    /**
-     * Get a string from the cache, and if no such string has been found, create
-     * a new one with only this content. This solves out of memory problems if
-     * the string is a substring of another, large string. In Java, strings are
-     * shared, which could lead to memory problems. This avoid such problems.
-     *
-     * @param s the string
-     * @return a string that is guaranteed not be a substring of a large string
-     */
-    public static String fromCacheOrNew(String s) {
-        if (!SysProperties.OBJECT_CACHE) {
-            return s;
-        }
-        if (s == null) {
-            return s;
-        } else if (s.length() == 0) {
-            return "";
-        }
-        int hash = s.hashCode();
-        String[] cache = getCache();
-        int index = hash & (SysProperties.OBJECT_CACHE_SIZE - 1);
-        if (cache == null) {
-            return s;
-        }
-        String cached = cache[index];
-        if (cached != null) {
-            if (s.equals(cached)) {
-                return cached;
-            }
-        }
-        // create a new object that is not shared
-        // (to avoid out of memory if it is a substring of a big String)
-        // (not longer needed for Java 7 update 6 and newer,
-        // but the performance overhead is very small for those
-        // versions where it is not needed)
-        // NOPMD
-        s = new String(s);
-        cache[index] = s;
-        return s;
-    }
-
     /**
      * Clear the cache. This method is used for testing.
      */

h2/src/test/org/h2/test/unit/TestStringCache.java

 /*
- * Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
- * and the EPL 1.0 (http://h2database.com/html/license.html).
- * Initial Developer: H2 Group
+ * Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0, and the
+ * EPL 1.0 (http://h2database.com/html/license.html). Initial Developer: H2
+ * Group
  */
 package org.h2.test.unit;
 
 import java.util.Locale;
 import java.util.Random;
-
 import org.h2.test.TestBase;
 import org.h2.util.StringUtils;
 
@@ -23,7 +22,6 @@ public class TestStringCache extends TestBase {
     private final Random random = new Random(1);
     private final String[] some = { null, "", "ABC",
             "this is a medium sized string", "1", "2" };
-    private boolean returnNew;
     private boolean useIntern;
 
     /**
@@ -40,11 +38,6 @@ public class TestStringCache extends TestBase {
     @Override
     public void test() throws InterruptedException {
         testToUpperToLower();
-        returnNew = true;
-        StringUtils.clearCache();
-        testSingleThread(getSize(5000, 20000));
-        testMultiThreads();
-        returnNew = false;
         StringUtils.clearCache();
         testSingleThread(getSize(5000, 20000));
         testMultiThreads();
@@ -105,7 +98,6 @@ public class TestStringCache extends TestBase {
         testToUpperCache();
         testToUpperCache();
         testToUpperCache();
-        returnNew = false;
         for (int i = 0; i < 6; i++) {
             useIntern = (i % 2) == 0;
             long time = System.currentTimeMillis();
@@ -124,7 +116,8 @@ public class TestStringCache extends TestBase {
             }
             return s;
         }
-        int len = random.nextBoolean() ? random.nextInt(1000) : random.nextInt(10);
+        int len = random.nextBoolean() ? random.nextInt(1000)
+                : random.nextInt(10);
         StringBuilder buff = new StringBuilder(len);
         for (int i = 0; i < len; i++) {
             buff.append(random.nextInt(0xfff));
@@ -137,18 +130,6 @@ public class TestStringCache extends TestBase {
      */
     void testString() {
         String a = randomString();
-        if (returnNew) {
-            String b = StringUtils.fromCacheOrNew(a);
-            try {
-                assertEquals(a, b);
-            } catch (Exception e) {
-                TestBase.logError("error", e);
-            }
-            if (a != null && a == b && a.length() > 0) {
-                throw new AssertionError("a=" + System.identityHashCode(a) +
-                        " b=" + System.identityHashCode(b));
-            }
-        } else {
         String b;
         if (useIntern) {
             b = a == null ? null : a.intern();
@@ -161,7 +142,6 @@ public class TestStringCache extends TestBase {
             TestBase.logError("error", e);
         }
     }
-    }
 
     private void testSingleThread(int len) {
         for (int i = 0; i < len; i++) {