scripting: replace StringBuffer with StringBuilder method

In JDK 1.3, StringBuffer makes the String concatenations faster.

public String concat(String s1, String s2) {
  StringBuffer sb = new StringBuffer();
  sb.append(s1);
  sb.append(s2);
  return sb.toString();
}

JDK 1.5 comes with StringBuilder (which is faster than StringBuffer) and the method:

public String concat(String s1, String s2) {
  return s1 + s2;
}

is translated to:

public String concat(String s1, String s2) {
  return new StringBuilder().append(s1).append(s2).toString();
}

Change-Id: I2924fcdf23d7ffbb567d9e924d02edcab4d21be6
NOTE: StringBuffer is synchronized, StringBuilder is not.
Reviewed-on: https://gerrit.libreoffice.org/11436Reviewed-by: Noel Grandin <noelgrandin@gmail.com>
Tested-by: Noel Grandin <noelgrandin@gmail.com>

scripting/java/com/sun/star/script/framework/container/ScriptMetaData.java

@@ -279,7 +279,7 @@ public class ScriptMetaData extends ScriptEntry {
 
                 if ( sourceUrl != null )
                 {
-                    StringBuffer buf = new StringBuffer();
+                    StringBuilder buf = new StringBuilder();
                     InputStream in = sourceUrl.openStream();
 
                     byte[] contents = new byte[1024];

scripting/java/com/sun/star/script/framework/provider/PathUtils.java

@@ -60,7 +60,8 @@ public class PathUtils {
     }
     static  public String make_url( String baseUrl, String url )
     {
-        StringBuffer buff = new StringBuffer( baseUrl.length() + url.length() );        buff.append( baseUrl );
+        StringBuilder buff = new StringBuilder( baseUrl.length() + url.length() );
+        buff.append( baseUrl );
         StringTokenizer t = new StringTokenizer( url, "/");
         while ( t.hasMoreElements() )
         {

scripting/java/com/sun/star/script/framework/provider/beanshell/ScriptEditorForBeanShell.java

@@ -71,7 +71,7 @@ public class ScriptEditorForBeanShell
                 ScriptEditorForBeanShell.class.getResource("template.bsh");
 
             InputStream in = url.openStream();
-            StringBuffer buf = new StringBuffer();
+            StringBuilder buf = new StringBuilder();
             byte[] b = new byte[1024];
             int len;
             while ((len = in.read(b)) != -1) {

scripting/java/com/sun/star/script/framework/provider/beanshell/ScriptSourceModel.java

@@ -35,7 +35,7 @@ public class ScriptSourceModel {
     }
 
     private String load() throws IOException {
-        StringBuffer buf = new StringBuffer();
+        StringBuilder buf = new StringBuilder();
         InputStream in = file.openStream();
 
         byte[] contents = new byte[1024];

scripting/java/com/sun/star/script/framework/provider/java/ScriptDescriptor.java

@@ -165,7 +165,7 @@ public class ScriptDescriptor
     @Override
     public String toString()
     {
-        StringBuffer description = new StringBuffer( m_name );
+        StringBuilder description = new StringBuilder( m_name );
         Class<?>[] types = getArgumentTypes();
 
         description.append( " (" );

scripting/java/com/sun/star/script/framework/provider/javascript/ScriptEditorForJavaScript.java

@@ -59,7 +59,7 @@ public class ScriptEditorForJavaScript implements ScriptEditor
                 ScriptEditorForJavaScript.class.getResource("template.js");
 
             InputStream in = url.openStream();
-            StringBuffer buf = new StringBuffer();
+            StringBuilder buf = new StringBuilder();
             byte[] b = new byte[1024];
             int len;
             while ((len = in.read(b)) != -1) {

scripting/java/org/openoffice/idesupport/SVersionRCFile.java

@@ -160,7 +160,7 @@ public class SVersionRCFile {
         if (System.getProperty("os.name").startsWith("Windows"))
             path = path.replace(File.separatorChar, '/');
 
-        StringBuffer buf = new StringBuffer(FILE_URL_PREFIX);
+        StringBuilder buf = new StringBuilder(FILE_URL_PREFIX);
         buf.append(path);
 
         if (f.isDirectory())

scripting/java/org/openoffice/idesupport/filter/ExceptParcelFilter.java

@@ -42,10 +42,6 @@ public class ExceptParcelFilter implements FileFilter {
 
     @Override
     public String toString() {
-        StringBuffer buf = new StringBuffer(DESCRIPTION + ": ");
-
-        buf.append("<" + ExceptParcelFilter.parcelName + ">");
-
-        return buf.toString();
+        return DESCRIPTION + ": " + "<" + ExceptParcelFilter.parcelName + ">";
     }
 }