From dfe78601810c44b533e30c95546838ee2e0a9a70 Mon Sep 17 00:00:00 2001
From: Peter Bernard West <pbwest@apache.org>
Date: Sat, 19 Oct 2002 02:04:19 +0000
Subject: Added subtract/add(double) and isInteger(). Removed setPower().

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/branches/FOP_0-20-0_Alt-Design@195333 13f79535-47bb-0310-9956-ffa450edef68
---
 src/org/apache/fop/datatypes/Numeric.java | 47 +++++++++++++++++++++++++------
 1 file changed, 39 insertions(+), 8 deletions(-)

diff --git a/src/org/apache/fop/datatypes/Numeric.java b/src/org/apache/fop/datatypes/Numeric.java
index 0f18cf42b..9c5732fa6 100644
--- a/src/org/apache/fop/datatypes/Numeric.java
+++ b/src/org/apache/fop/datatypes/Numeric.java
@@ -14,6 +14,7 @@ import java.lang.Number;
 
 import org.apache.fop.datatypes.AbstractPropertyValue;
 import org.apache.fop.fo.expr.PropertyException;
+import org.apache.fop.fo.PropNames;
 import org.apache.fop.fo.PropertyConsts;
 import org.apache.fop.fo.Properties;
 import org.apache.fop.datatypes.PropertyValue;
@@ -286,14 +287,6 @@ public class Numeric extends AbstractPropertyValue implements Cloneable {
         return power;
     }
 
-    /**
-     * Set the power.  A complement to the <i>setValue</i> method.
-     * @param power - the <tt>int</tt> power.
-     */
-    protected void setPower(int power) {
-        this.power = power;
-    }
-
     /**
      * @return <tt>int</tt> current baseunit of this <i>Numeric</i>.
      */
@@ -373,6 +366,14 @@ public class Numeric extends AbstractPropertyValue implements Cloneable {
         return (baseunit == NUMBER);
     }
 
+    /**
+     * This object is an integer if it is a number and the
+     * rounded value is equal to the value.
+     */
+    public boolean isInteger() {
+        return (isNumber() && (double)(Math.round(value)) == value);
+    }
+
     /**
      * This object is an EMS factor if the baseunit is EMS.  Power is
      * guaranteed to be zero for EMS baseunit.
@@ -498,6 +499,21 @@ public class Numeric extends AbstractPropertyValue implements Cloneable {
         return this;
     }
 
+    /**
+     * Subtract a <tt>double</tt> from the current value.
+     * @param op - the value to subtract.
+     * @return <i>Numeric</i>; this object.
+     * @throws PropertyException if this is not a number.
+     */
+    public Numeric subtract(double op) throws PropertyException {
+        // Check of same dimension
+        if (power != 0 || baseunit != NUMBER)
+            throw new PropertyException
+                    ("Can't subtract number from length.");
+        value -= op;
+        return this;
+    }
+
     /**
      * Add the operand to the current value.
      * @param op The value to add.
@@ -526,6 +542,21 @@ public class Numeric extends AbstractPropertyValue implements Cloneable {
         return this;
     }
 
+    /**
+     * Add a <tt>double</tt> to the current value.
+     * @param op - the value to add.
+     * @return <i>Numeric</i>; this object.
+     * @throws PropertyException if this is not a number.
+     */
+    public Numeric add(double op) throws PropertyException {
+        // Check of same dimension
+        if (power != 0 || baseunit != NUMBER)
+            throw new PropertyException
+                    ("Can't add number to length.");
+        value += op;
+        return this;
+    }
+
     /**
      * Derive the remainder from a truncating division (mod).  As with
      * additive operators, the values must be absolute <tt>Numeric</tt>s
-- 
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