Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.utils / src / org / simantics / utils / format / FormattingUtils.java

diff --git a/bundles/org.simantics.utils/src/org/simantics/utils/format/FormattingUtils.java b/bundles/org.simantics.utils/src/org/simantics/utils/format/FormattingUtils.java
new file mode 100644 (file)
index 0000000..747da6b
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+++ b/bundles/org.simantics.utils/src/org/simantics/utils/format/FormattingUtils.java
@@ -0,0 +1,99 @@
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ *     VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.utils.format;\r
+\r
+import java.math.BigDecimal;\r
+import java.math.MathContext;\r
+import java.text.DecimalFormat;\r
+import java.text.DecimalFormatSymbols;\r
+import java.text.FieldPosition;\r
+import java.text.Format;\r
+import java.text.NumberFormat;\r
+import java.text.ParsePosition;\r
+import java.util.Locale;\r
+\r
+/**\r
+ * @author Antti Villberg\r
+ */\r
+public class FormattingUtils {\r
+\r
+    public static final FormattingUtil US      = new FormattingUtil(5, 5, Locale.US);\r
+    public static final FormattingUtil DEFAULT = US;\r
+\r
+    public static String engineeringFormat(Object value) {\r
+        return DEFAULT.engineeringFormat(value);\r
+    }\r
+\r
+    public static Format significantDigitFormat(int withSignificantDigits) {\r
+        return significantDigitFormat(withSignificantDigits, false);\r
+    }\r
+\r
+    public static Format significantDigitFormat(int withSignificantDigits, boolean stripTrailingZeros) {\r
+        if (withSignificantDigits < 1)\r
+            throw new IllegalArgumentException("withSignificantDigits must be > 0, got " + withSignificantDigits);\r
+        StringBuilder sb = new StringBuilder(withSignificantDigits + 3);\r
+        sb.append("0.");\r
+        for (int i = 0; i < withSignificantDigits-1; i++)\r
+            sb.append("#");\r
+        sb.append("E0");\r
+        NumberFormat low = new DecimalFormat(sb.toString());\r
+        low.setGroupingUsed(false);\r
+        NumberFormat hi = new SignificantDigitFormat(withSignificantDigits, stripTrailingZeros);\r
+        Format format = new SwitchFormat(0.1, 1, low, hi, hi);\r
+        return format;\r
+    }\r
+\r
+    private static class SignificantDigitFormat extends NumberFormat {\r
+\r
+        private static final long serialVersionUID = 1079268918077141671L;\r
+\r
+        private MathContext mc;\r
+        private boolean stripTrailingZeros;\r
+        private boolean fixDecimalSeparator;\r
+        private char decimalSeparator;\r
+\r
+        public SignificantDigitFormat(int digits, boolean stripTrailingZeros) {\r
+            this.mc = new MathContext(digits);\r
+            this.stripTrailingZeros = stripTrailingZeros;\r
+            DecimalFormatSymbols symbols = DecimalFormatSymbols.getInstance();\r
+            decimalSeparator = symbols.getDecimalSeparator();\r
+            // BigDecimal always formats doubles with '.' as decimal separator.\r
+            if (decimalSeparator != '.')\r
+                fixDecimalSeparator = true;\r
+            else\r
+                fixDecimalSeparator = false;\r
+        }\r
+\r
+        @Override\r
+        public StringBuffer format(double number, StringBuffer toAppendTo, FieldPosition pos) {\r
+            BigDecimal big = new BigDecimal(number, mc);\r
+            if (stripTrailingZeros)\r
+                big = big.stripTrailingZeros();\r
+            String str = big.toString();\r
+            if (fixDecimalSeparator)\r
+                str = str.replace('.', decimalSeparator);\r
+            return toAppendTo.append(str);\r
+        }\r
+\r
+        @Override\r
+        public StringBuffer format(long number, StringBuffer toAppendTo, FieldPosition pos) {\r
+            return toAppendTo.append(number);\r
+        }\r
+\r
+        @Override\r
+        public Number parse(String source, ParsePosition parsePosition) {\r
+            return 0;\r
+        }\r
+\r
+    }\r
+\r
+}\r