From 50b1726893fb646aee1deb64f005ab7ef6989f79 Mon Sep 17 00:00:00 2001
From: "Maxim.Mossienko" <maxim.mossienko@jetbrains.com>
Date: Thu, 3 May 2012 00:01:34 +0400
Subject: [PATCH] do not create strings just to create (String)Reader when we
 can use CharArrayReader (quite often we can get char[] form sequence)

---
 .../src/com/intellij/util/text/CharArrayUtil.java    | 12 +++++++++---
 .../intellij/lang/ant/psi/impl/AntImportsIndex.java  |  6 +++---
 2 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/platform/util/src/com/intellij/util/text/CharArrayUtil.java b/platform/util/src/com/intellij/util/text/CharArrayUtil.java
index 9cdd22360386..164b1ad9eb9d 100644
--- a/platform/util/src/com/intellij/util/text/CharArrayUtil.java
+++ b/platform/util/src/com/intellij/util/text/CharArrayUtil.java
@@ -19,9 +19,7 @@ import com.intellij.openapi.util.TextRange;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.io.OutputStreamWriter;
+import java.io.*;
 import java.nio.CharBuffer;
 import java.util.ArrayList;
 import java.util.List;
@@ -547,4 +545,12 @@ public class CharArrayUtil {
     }
     return true;
   }
+
+  public static Reader readerFromCharSequence(CharSequence text) {
+    Reader reader;
+    char[] chars = fromSequenceWithoutCopying(text);
+    if (chars != null) reader = new CharArrayReader(chars, 0, text.length());
+    else reader = new StringReader(text.toString());
+    return reader;
+  }
 }
diff --git a/plugins/ant/src/com/intellij/lang/ant/psi/impl/AntImportsIndex.java b/plugins/ant/src/com/intellij/lang/ant/psi/impl/AntImportsIndex.java
index e64a45dbeddd..a466ef4bf23b 100644
--- a/plugins/ant/src/com/intellij/lang/ant/psi/impl/AntImportsIndex.java
+++ b/plugins/ant/src/com/intellij/lang/ant/psi/impl/AntImportsIndex.java
@@ -20,10 +20,10 @@ import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.util.indexing.*;
 import com.intellij.util.io.EnumeratorIntegerDescriptor;
 import com.intellij.util.io.KeyDescriptor;
+import com.intellij.util.text.CharArrayUtil;
 import com.intellij.util.xml.NanoXmlUtil;
 import org.jetbrains.annotations.NotNull;
 
-import java.io.StringReader;
 import java.util.HashMap;
 import java.util.Map;
 
@@ -41,8 +41,8 @@ public class AntImportsIndex extends ScalarIndexExtension<Integer>{
     @NotNull
     public Map<Integer, Void> map(final FileContent inputData) {
       final Map<Integer, Void> map = new HashMap<Integer, Void>();
-      
-      NanoXmlUtil.parse(new StringReader(inputData.getContentAsText().toString()), new NanoXmlUtil.IXMLBuilderAdapter() {
+
+      NanoXmlUtil.parse(CharArrayUtil.readerFromCharSequence(inputData.getContentAsText()), new NanoXmlUtil.IXMLBuilderAdapter() {
         private boolean isFirstElement = true;
         @Override
         public void startElement(final String elemName, final String nsPrefix, final String nsURI, final String systemID, final int lineNr) throws Exception {