From f8ac181c5b6b00727cef8cc5da28ab71493b5b57 Mon Sep 17 00:00:00 2001
From: Julian Hyde <julianhyde@gmail.com>
Date: Tue, 27 Nov 2012 21:26:27 +0000
Subject: [PATCH] Oops.

git-svn-id: https://olap4j.svn.sourceforge.net/svnroot/olap4j/trunk@554 c6a108a4-781c-0410-a6c6-c2d559e19af0
---
 src/org/olap4j/impl/Spacer.java | 115 ++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 src/org/olap4j/impl/Spacer.java

diff --git a/src/org/olap4j/impl/Spacer.java b/src/org/olap4j/impl/Spacer.java
new file mode 100644
index 0000000..b86c2c1
--- /dev/null
+++ b/src/org/olap4j/impl/Spacer.java
@@ -0,0 +1,115 @@
+/*
+// $Id: UnmodifiableArrayList.java 482 2012-01-05 23:27:27Z jhyde $
+//
+// Licensed to Julian Hyde under one or more contributor license
+// agreements. See the NOTICE file distributed with this work for
+// additional information regarding copyright ownership.
+//
+// Julian Hyde licenses this file to you under the Apache License,
+// Version 2.0 (the "License"); you may not use this file except in
+// compliance with the License. You may obtain a copy of the License at:
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+*/
+package org.olap4j.impl;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.io.StringWriter;
+import java.io.Writer;
+import java.util.Arrays;
+import java.util.concurrent.locks.ReentrantLock;
+
+/**
+ * Efficiently writes strings of spaces.
+ */
+public class Spacer {
+    private static final ReentrantLock lock = new ReentrantLock();
+
+    private static char[] spaces = {' '};
+
+    private int n;
+
+    /** Creates a Spacer with zero spaces. */
+    public Spacer() {
+        this(0);
+    }
+
+    /** Creates a Spacer with a given number of spaces. */
+    public Spacer(int n) {
+        this.n = n;
+    }
+
+    /** Sets the current number of spaces. */
+    public Spacer set(int n) {
+        this.n = n;
+        return this;
+    }
+
+    /** Returns the current number of spaces. */
+    public int get() {
+        return n;
+    }
+
+    /** Increases the current number of spaces by {@code n}. */
+    public Spacer add(int n) {
+        this.n += n;
+        return this;
+    }
+
+    /** Reduces the current number of spaces by {@code n}. */
+    public Spacer subtract(int n) {
+        this.n -= n;
+        return this;
+    }
+
+    /** Returns a string of the current number of spaces. */
+    public String toString() {
+        return new String(getSpaces(n), 0, n);
+    }
+
+    /** Appends current number of spaces to a {@link StringBuilder}. */
+    public StringBuilder spaces(StringBuilder buf) {
+        buf.append(getSpaces(n), 0, n);
+        return buf;
+    }
+
+    /** Appends current number of spaces to a {@link Writer}. */
+    public Writer spaces(Writer buf) throws IOException {
+        buf.write(getSpaces(n), 0, n);
+        return buf;
+    }
+
+    /** Appends current number of spaces to a {@link StringWriter}. */
+    public StringWriter spaces(StringWriter buf) {
+        buf.write(getSpaces(n), 0, n);
+        return buf;
+    }
+
+    /** Appends current number of spaces to a {@link PrintWriter}. */
+    public PrintWriter spaces(PrintWriter buf) {
+        buf.write(getSpaces(n), 0, n);
+        return buf;
+    }
+
+    private static char[] getSpaces(int n) {
+        lock.lock();
+        try {
+            if (spaces.length < n) {
+                spaces = new char[n];
+                Arrays.fill(spaces, ' ');
+            }
+            return spaces;
+        } finally {
+            lock.unlock();
+        }
+    }
+}
+
+// End Spacer.java