1 files changed, 82 insertions, 0 deletions
diff --git a/src/java/org/apache/fop/render/extensions/prepress/PageScaleAttributes.java b/src/java/org/apache/fop/render/extensions/prepress/PageScaleAttributes.java
new file mode 100644
index 000000000..96f0fbc30
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+++ b/src/java/org/apache/fop/render/extensions/prepress/PageScaleAttributes.java
@@ -0,0 +1,82 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF 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.
+ */
+
+/* $Id$ */
+
+package org.apache.fop.render.extensions.prepress;
+
+import java.awt.geom.Point2D;
+import java.text.MessageFormat;
+
+import org.apache.xmlgraphics.util.QName;
+
+import org.apache.fop.fo.extensions.ExtensionElementMapping;
+
+
+/**
+ * This class contains definition of 'scale' FOF's extension attribute for XSL-FO, and provides
+ * utility method to parse the possible values of this attibute
+ */
+public final class PageScaleAttributes {
+
+    /**
+     * The extension 'scale' attribute for simple-page-master element
+     */
+    public static final QName EXT_PAGE_SCALE
+            = new QName(ExtensionElementMapping.URI, null, "scale");
+
+
+    /**
+     * Utility classes should not have a public or default constructor
+     */
+    private PageScaleAttributes() {
+    }
+
+    /**
+     * Compute scale parameters from given fox:scale attribute which has format: scaleX [scaleY]
+     * If scaleY is not defined, it equals scaleX
+     * @param scale scale attribute, input format: scaleX [scaleY]
+     * @return the pair of (sx, sy) values
+     */
+    public static Point2D.Double getScaleAttributes(String scale) {
+        final String err = "Extension 'scale' attribute has incorrect value(s): {0}";
+
+        if (scale == null) {
+            return null;
+        }
+
+        Point2D.Double result = null;
+
+        try {
+            String[] scales = scale.split(" ");
+            if (scales.length > 0) {
+                result = new Point2D.Double(Double.parseDouble(scales[0]),
+                        Double.parseDouble(scales[0]));
+            }
+            if (scales.length > 1) {
+                result.y = Double.parseDouble(scales[1]);
+            }
+            if (result.x <= 0 || result.y <= 0) {
+                throw new IllegalArgumentException(MessageFormat.format(err, new Object[]{scale}));
+            }
+        } catch (NumberFormatException nfe) {
+            throw new IllegalArgumentException(MessageFormat.format(err, new Object[]{scale}));
+        }
+
+        return result;
+    }
+}