| /* |
| * 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 java.util.regex.Pattern; |
| |
| import org.apache.xmlgraphics.util.QName; |
| |
| import org.apache.fop.fo.extensions.ExtensionElementMapping; |
| |
| /** |
| * This class provides utility methods to parse the 'fox:scale' extension attribute. |
| */ |
| public final class PageScale { |
| |
| /** |
| * The extension 'scale' attribute for the simple-page-master element. |
| */ |
| public static final QName EXT_PAGE_SCALE |
| = new QName(ExtensionElementMapping.URI, null, "scale"); |
| |
| private static final Pattern WHITESPACE_PATTERN = Pattern.compile("\\s+"); |
| |
| /** |
| * Utility classes should not have a public or default constructor |
| */ |
| private PageScale() { |
| } |
| |
| /** |
| * Compute scale parameters from given fox:scale attribute which has the 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 getScale(String scale) { |
| // TODO throw appropriate exceptions that can be caught by the event |
| // notification mechanism |
| final String err = "Extension 'scale' attribute has incorrect value(s): {0}"; |
| |
| if (scale == null || scale.equals("")) { |
| return null; |
| } |
| |
| String[] scales = WHITESPACE_PATTERN.split(scale); |
| double scaleX; |
| try { |
| scaleX = Double.parseDouble(scales[0]); |
| } catch (NumberFormatException nfe) { |
| throw new IllegalArgumentException(MessageFormat.format(err, new Object[]{scale})); |
| } |
| double scaleY; |
| switch (scales.length) { |
| case 1: |
| scaleY = scaleX; |
| break; |
| case 2: |
| try { |
| scaleY = Double.parseDouble(scales[1]); |
| } catch (NumberFormatException nfe) { |
| throw new IllegalArgumentException(MessageFormat.format(err, new Object[]{scale})); |
| } |
| break; |
| default: |
| throw new IllegalArgumentException("Too many arguments"); |
| } |
| if (scaleX <= 0 || scaleY <= 0) { |
| throw new IllegalArgumentException(MessageFormat.format(err, new Object[]{scale})); |
| } |
| |
| return new Point2D.Double(scaleX, scaleY); |
| } |
| } |