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- /*
- * 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);
- }
- }
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