6432566: Replace usage of StringBuffer with StringBuilder in Swing

Reviewed-by: malenkov

src/share/classes/javax/swing/DebugGraphics.java

@@ -1322,13 +1322,11 @@ public class DebugGraphics extends Graphics {
     }
 
     String toShortString() {
-        StringBuffer buffer = new StringBuffer("Graphics" + (isDrawingBuffer() ? "<B>" : "") + "(" + graphicsID + "-" + debugOptions + ")");
-        return buffer.toString();
+        return "Graphics" + (isDrawingBuffer() ? "<B>" : "") + "(" + graphicsID + "-" + debugOptions + ")";
     }
 
     String pointToString(int x, int y) {
-        StringBuffer buffer = new StringBuffer("(" + x + ", " + y + ")");
-        return buffer.toString();
+        return "(" + x + ", " + y + ")";
     }
 
     /** Enables/disables diagnostic information about every graphics

src/share/classes/javax/swing/text/DefaultCaret.java

@@ -1334,13 +1334,13 @@ public class DefaultCaret extends Rectangle implements Caret, FocusListener, Mou
                     && component.getClientProperty("JPasswordField.cutCopyAllowed") !=
                     Boolean.TRUE) {
                     //fix for 4793761
-                    StringBuffer txt = null;
+                    StringBuilder txt = null;
                     char echoChar = ((JPasswordField)component).getEchoChar();
                     int p0 = Math.min(getDot(), getMark());
                     int p1 = Math.max(getDot(), getMark());
                     for (int i = p0; i < p1; i++) {
                         if (txt == null) {
-                            txt = new StringBuffer();
+                            txt = new StringBuilder();
                         }
                         txt.append(echoChar);
                     }
@@ -1675,7 +1675,6 @@ public class DefaultCaret extends Rectangle implements Caret, FocusListener, Mou
                 }
                 return;
             }
-            int adjust = 0;
             int offset = e.getOffset();
             int length = e.getLength();
             int newDot = dot;
@@ -1759,7 +1758,6 @@ public class DefaultCaret extends Rectangle implements Caret, FocusListener, Mou
             }
             int offs0 = e.getOffset();
             int offs1 = offs0 + e.getLength();
-            int adjust = 0;
             int newDot = dot;
             boolean adjustDotBias = false;
             int newMark = mark;

src/share/classes/javax/swing/text/DefaultStyledDocument.java

@@ -132,7 +132,7 @@ public class DefaultStyledDocument extends AbstractDocument implements StyledDoc
             // install the content
             Content c = getContent();
             int n = data.length;
-            StringBuffer sb = new StringBuffer();
+            StringBuilder sb = new StringBuilder();
             for (int i = 0; i < n; i++) {
                 ElementSpec es = data[i];
                 if (es.getLength() > 0) {
@@ -191,7 +191,7 @@ public class DefaultStyledDocument extends AbstractDocument implements StyledDoc
             // install the content
             Content c = getContent();
             int n = data.length;
-            StringBuffer sb = new StringBuffer();
+            StringBuilder sb = new StringBuilder();
             for (int i = 0; i < n; i++) {
                 ElementSpec es = data[i];
                 if (es.getLength() > 0) {

src/share/classes/javax/swing/text/InternationalFormatter.java

@@ -30,7 +30,6 @@ import java.text.*;
 import java.text.AttributedCharacterIterator.Attribute;
 import java.util.*;
 import javax.swing.*;
-import javax.swing.text.*;
 
 /**
  * <code>InternationalFormatter</code> extends <code>DefaultFormatter</code>,
@@ -875,7 +874,6 @@ public class InternationalFormatter extends DefaultFormatter {
                     (f instanceof AttributedCharacterIterator.Attribute)) {
             AttributedCharacterIterator.Attribute field =
                                    (AttributedCharacterIterator.Attribute)f;
-            int index = 0;
 
             iterator.first();
             while (iterator.getIndex() < start) {

src/share/classes/javax/swing/text/JTextComponent.java

@@ -35,10 +35,7 @@ import java.util.HashMap;
 import java.util.Hashtable;
 import java.util.Enumeration;
 import java.util.Vector;
-import java.util.Iterator;
 import java.util.Map;
-import java.util.Map.Entry;
-import java.util.Set;
 
 import java.util.concurrent.*;
 
@@ -4058,7 +4055,7 @@ public abstract class JTextComponent extends JComponent implements Scrollable, A
 
     private static final Object KEYMAP_TABLE =
         new StringBuilder("JTextComponent_KeymapTable");
-    private JTextComponent editor;
+
     //
     // member variables used for on-the-spot input method
     // editing style support
@@ -4748,14 +4745,14 @@ public abstract class JTextComponent extends JComponent implements Scrollable, A
                         processKeyEvent(ke);
                     }
                 } else {
-                    StringBuffer strBuf = new StringBuffer();
+                    StringBuilder strBuf = new StringBuilder();
                     for (char c = text.current(); commitCount > 0;
                          c = text.next(), commitCount--) {
                         strBuf.append(c);
                     }
 
                     // map it to an ActionEvent
-                    mapCommittedTextToAction(new String(strBuf));
+                    mapCommittedTextToAction(strBuf.toString());
                 }
 
                 // Remember latest committed text end index
@@ -4801,7 +4798,7 @@ public abstract class JTextComponent extends JComponent implements Scrollable, A
     private void createComposedTextAttribute(int composedIndex,
                                         AttributedCharacterIterator text) {
         Document doc = getDocument();
-        StringBuffer strBuf = new StringBuffer();
+        StringBuilder strBuf = new StringBuilder();
 
         // create attributed string with no attributes
         for (char c = text.setIndex(composedIndex);
@@ -4809,7 +4806,7 @@ public abstract class JTextComponent extends JComponent implements Scrollable, A
             strBuf.append(c);
         }
 
-        composedTextContent = new String(strBuf);
+        composedTextContent = strBuf.toString();
         composedTextAttribute = new SimpleAttributeSet();
         composedTextAttribute.addAttribute(StyleConstants.ComposedTextAttribute,
                 new AttributedString(text, composedIndex, text.getEndIndex()));

src/share/classes/javax/swing/text/MaskFormatter.java

@@ -29,7 +29,6 @@ import java.io.*;
 import java.text.*;
 import java.util.*;
 import javax.swing.*;
-import javax.swing.text.*;
 
 /**
  * <code>MaskFormatter</code> is used to format and edit strings. The behavior
@@ -385,7 +384,7 @@ public class MaskFormatter extends DefaultFormatter {
      */
     public String valueToString(Object value) throws ParseException {
         String sValue = (value == null) ? "" : value.toString();
-        StringBuffer result = new StringBuffer();
+        StringBuilder result = new StringBuilder();
         String placeholder = getPlaceholder();
         int[] valueCounter = { 0 };
 
@@ -484,7 +483,7 @@ public class MaskFormatter extends DefaultFormatter {
      * Invokes <code>append</code> on the mask characters in
      * <code>mask</code>.
      */
-    private void append(StringBuffer result, String value, int[] index,
+    private void append(StringBuilder result, String value, int[] index,
                         String placeholder, MaskCharacter[] mask)
                           throws ParseException {
         for (int counter = 0, maxCounter = mask.length;
@@ -611,13 +610,13 @@ public class MaskFormatter extends DefaultFormatter {
      * Removes the literal characters from the passed in string.
      */
     private String stripLiteralChars(String string) {
-        StringBuffer sb = null;
+        StringBuilder sb = null;
         int last = 0;
 
         for (int counter = 0, max = string.length(); counter < max; counter++){
             if (isLiteral(counter)) {
                 if (sb == null) {
-                    sb = new StringBuffer();
+                    sb = new StringBuilder();
                     if (counter > 0) {
                         sb.append(string.substring(0, counter));
                     }
@@ -715,10 +714,10 @@ public class MaskFormatter extends DefaultFormatter {
      */
     boolean canReplace(ReplaceHolder rh) {
         // This method is rather long, but much of the burden is in
-        // maintaining a String and swapping to a StringBuffer only if
+        // maintaining a String and swapping to a StringBuilder only if
         // absolutely necessary.
         if (!getAllowsInvalid()) {
-            StringBuffer replace = null;
+            StringBuilder replace = null;
             String text = rh.text;
             int tl = (text != null) ? text.length() : 0;
 
@@ -737,7 +736,7 @@ public class MaskFormatter extends DefaultFormatter {
                     char aChar = text.charAt(textIndex);
                     if (aChar != getCharacter(rh.offset + counter, aChar)) {
                         if (replace == null) {
-                            replace = new StringBuffer();
+                            replace = new StringBuilder();
                             if (textIndex > 0) {
                                 replace.append(text.substring(0, textIndex));
                             }
@@ -758,7 +757,7 @@ public class MaskFormatter extends DefaultFormatter {
                         }
                     }
                     else if (textIndex > 0) {
-                        replace = new StringBuffer(max);
+                        replace = new StringBuilder(max);
                         replace.append(text.substring(0, textIndex));
                         replace.append(getLiteral(rh.offset + counter));
                         if (textIndex < tl) {
@@ -780,7 +779,7 @@ public class MaskFormatter extends DefaultFormatter {
                 else if (textIndex >= tl) {
                     // placeholder
                     if (replace == null) {
-                        replace = new StringBuffer();
+                        replace = new StringBuilder();
                         if (text != null) {
                             replace.append(text);
                         }
@@ -863,7 +862,7 @@ public class MaskFormatter extends DefaultFormatter {
          * Appends the necessary character in <code>formatting</code> at
          * <code>index</code> to <code>buff</code>.
          */
-        public void append(StringBuffer buff, String formatting, int[] index,
+        public void append(StringBuilder buff, String formatting, int[] index,
                            String placeholder)
                           throws ParseException {
             boolean inString = index[0] < formatting.length();

src/share/classes/javax/swing/text/NumberFormatter.java

@@ -27,7 +27,6 @@ package javax.swing.text;
 import java.lang.reflect.*;
 import java.text.*;
 import java.util.*;
-import javax.swing.text.*;
 
 /**
  * <code>NumberFormatter</code> subclasses <code>InternationalFormatter</code>
@@ -132,7 +131,7 @@ public class NumberFormatter extends InternationalFormatter {
         DecimalFormatSymbols dfs = getDecimalFormatSymbols();
 
         if (dfs != null) {
-            StringBuffer sb = new StringBuffer();
+            StringBuilder sb = new StringBuilder();
 
             sb.append(dfs.getCurrencySymbol());
             sb.append(dfs.getDecimalSeparator());
@@ -239,13 +238,6 @@ public class NumberFormatter extends InternationalFormatter {
         return null;
     }
 
-    /**
-     */
-    private boolean isValidInsertionCharacter(char aChar) {
-        return (Character.isDigit(aChar) || specialChars.indexOf(aChar) != -1);
-    }
-
-
     /**
      * Subclassed to return false if <code>text</code> contains in an invalid
      * character to insert, that is, it is not a digit
@@ -402,28 +394,6 @@ public class NumberFormatter extends InternationalFormatter {
         return false;
     }
 
-    /**
-     * Returns true if the range offset to length identifies the only
-     * integer field.
-     */
-    private boolean isOnlyIntegerField(int offset, int length) {
-        if (isValidMask()) {
-            int start = getAttributeStart(NumberFormat.Field.INTEGER);
-
-            if (start != -1) {
-                AttributedCharacterIterator iterator = getIterator();
-
-                iterator.setIndex(start);
-                if (offset > start || iterator.getRunLimit(
-                    NumberFormat.Field.INTEGER) > (offset + length)) {
-                    return false;
-                }
-                return true;
-            }
-        }
-        return false;
-    }
-
     /**
      * Invoked to toggle the sign. For this to work the value class
      * must have a single arg constructor that takes a String.

src/share/classes/javax/swing/text/PlainDocument.java

@@ -25,7 +25,6 @@
 package javax.swing.text;
 
 import java.util.Vector;
-import javax.swing.event.*;
 
 /**
  * A plain document that maintains no character attributes.  The
@@ -118,7 +117,7 @@ public class PlainDocument extends AbstractDocument {
         Object filterNewlines = getProperty("filterNewlines");
         if ((filterNewlines instanceof Boolean) && filterNewlines.equals(Boolean.TRUE)) {
             if ((str != null) && (str.indexOf('\n') >= 0)) {
-                StringBuffer filtered = new StringBuffer(str);
+                StringBuilder filtered = new StringBuilder(str);
                 int n = filtered.length();
                 for (int i = 0; i < n; i++) {
                     if (filtered.charAt(i) == '\n') {
@@ -204,11 +203,9 @@ public class PlainDocument extends AbstractDocument {
                 }
             }
             if (hasBreaks) {
-                int rmCount = 1;
                 removed.addElement(rmCandidate);
                 if ((offset + length == rmOffs1) && (lastOffset != rmOffs1) &&
                     ((index+1) < lineMap.getElementCount())) {
-                    rmCount += 1;
                     Element e = lineMap.getElement(index+1);
                     removed.addElement(e);
                     rmOffs1 = e.getEndOffset();

src/share/classes/javax/swing/text/TabSet.java

@@ -199,7 +199,7 @@ public class TabSet implements Serializable
      */
     public String toString() {
         int            tabCount = getTabCount();
-        StringBuffer   buffer = new StringBuffer("[ ");
+        StringBuilder buffer = new StringBuilder("[ ");
 
         for(int counter = 0; counter < tabCount; counter++) {
             if(counter > 0)

src/share/classes/javax/swing/text/html/FormView.java

@@ -362,7 +362,7 @@ public class FormView extends ComponentView implements ActionListener {
      */
     public void actionPerformed(ActionEvent evt) {
         Element element = getElement();
-        StringBuffer dataBuffer = new StringBuffer();
+        StringBuilder dataBuffer = new StringBuilder();
         HTMLDocument doc = (HTMLDocument)getDocument();
         AttributeSet attr = element.getAttributes();
 
@@ -508,7 +508,7 @@ public class FormView extends ComponentView implements ActionListener {
      */
     protected void imageSubmit(String imageData) {
 
-        StringBuffer dataBuffer = new StringBuffer();
+        StringBuilder dataBuffer = new StringBuilder();
         Element elem = getElement();
         HTMLDocument hdoc = (HTMLDocument)elem.getDocument();
         getFormData(dataBuffer);
@@ -589,7 +589,7 @@ public class FormView extends ComponentView implements ActionListener {
      * @param targetElement the element that triggered the
      *                      form submission
      */
-    void getFormData(StringBuffer buffer) {
+    private void getFormData(StringBuilder buffer) {
         Element formE = getFormElement();
         if (formE != null) {
             ElementIterator it = new ElementIterator(formE);
@@ -623,7 +623,7 @@ public class FormView extends ComponentView implements ActionListener {
      * data is loaded in name/value pairs.
      *
      */
-    private void loadElementDataIntoBuffer(Element elem, StringBuffer buffer) {
+    private void loadElementDataIntoBuffer(Element elem, StringBuilder buffer) {
 
         AttributeSet attr = elem.getAttributes();
         String name = (String)attr.getAttribute(HTML.Attribute.NAME);
@@ -692,29 +692,6 @@ public class FormView extends ComponentView implements ActionListener {
             }
             if (path != null && path.length() > 0) {
                 value = path;
-/*
-
-                try {
-                    Reader reader = new BufferedReader(new FileReader(path));
-                    StringBuffer buffer = new StringBuffer();
-                    char[] cBuff = new char[1024];
-                    int read;
-
-                    try {
-                        while ((read = reader.read(cBuff)) != -1) {
-                            buffer.append(cBuff, 0, read);
-                        }
-                    } catch (IOException ioe) {
-                        buffer = null;
-                    }
-                    try {
-                        reader.close();
-                    } catch (IOException ioe) {}
-                    if (buffer != null) {
-                        value = buffer.toString();
-                    }
-                } catch (IOException ioe) {}
-*/
             }
         }
         return value;
@@ -740,7 +717,7 @@ public class FormView extends ComponentView implements ActionListener {
      * form element.  Basically, only items that are selected
      * and have their name attribute set are added to the buffer.
      */
-    private void loadSelectData(AttributeSet attr, StringBuffer buffer) {
+    private void loadSelectData(AttributeSet attr, StringBuilder buffer) {
 
         String name = (String)attr.getAttribute(HTML.Attribute.NAME);
         if (name == null) {
@@ -771,7 +748,7 @@ public class FormView extends ComponentView implements ActionListener {
      * URLEncoder.encode() method before being added to the
      * buffer.
      */
-    private void appendBuffer(StringBuffer buffer, String name, String value) {
+    private void appendBuffer(StringBuilder buffer, String name, String value) {
         if (buffer.length() > 0) {
             buffer.append('&');
         }

src/share/classes/javax/swing/text/html/MinimalHTMLWriter.java

@@ -691,11 +691,11 @@ public class MinimalHTMLWriter extends AbstractWriter {
         if (styleNameMapping == null) {
             return style;
         }
-        StringBuffer sb = null;
+        StringBuilder sb = null;
         for (int counter = style.length() - 1; counter >= 0; counter--) {
             if (!isValidCharacter(style.charAt(counter))) {
                 if (sb == null) {
-                    sb = new StringBuffer(style);
+                    sb = new StringBuilder(style);
                 }
                 sb.setCharAt(counter, 'a');
             }

src/share/classes/javax/swing/text/html/StyleSheet.java

@@ -998,7 +998,7 @@ public class StyleSheet extends StyleContext {
     void addRule(String[] selector, AttributeSet declaration,
                  boolean isLinked) {
         int n = selector.length;
-        StringBuffer sb = new StringBuffer();
+        StringBuilder sb = new StringBuilder();
         sb.append(selector[0]);
         for (int counter = 1; counter < n; counter++) {
             sb.append(' ');

src/share/classes/javax/swing/text/html/parser/Parser.java

@@ -1470,7 +1470,7 @@ class Parser implements DTDConstants {
      */
     public String parseDTDMarkup() throws IOException {
 
-        StringBuffer strBuff = new StringBuffer();
+        StringBuilder strBuff = new StringBuilder();
         ch = readCh();
         while(true) {
             switch (ch) {

src/share/classes/javax/swing/text/rtf/AbstractFilter.java

@@ -160,7 +160,7 @@ abstract class AbstractFilter extends OutputStream
     public void write(byte[] buf, int off, int len)
       throws IOException
     {
-      StringBuffer accumulator = null;
+      StringBuilder accumulator = null;
       while (len > 0) {
         short b = (short)buf[off];
 
@@ -178,7 +178,7 @@ abstract class AbstractFilter extends OutputStream
           char ch = translationTable[b];
           if (ch != (char)0) {
             if (accumulator == null)
-              accumulator = new StringBuffer();
+              accumulator = new StringBuilder();
             accumulator.append(ch);
           }
         }