Extracted conversion methods for String to int[] or double[] to a utility class.

Made AreaTreeParser.getAttributeAsXXX() methods static to stress their utility character, and removed the private parseRect() in favor of getAttributeAsRectangle2D().


git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@674276 13f79535-47bb-0310-9956-ffa450edef68

1 files changed, 110 insertions, 0 deletions

diff --git a/src/java/org/apache/fop/util/ConversionUtils.java b/src/java/org/apache/fop/util/ConversionUtils.java
new file mode 100644
index 000000000..e2d93fbd3
--- /dev/null
+++ b/src/java/org/apache/fop/util/ConversionUtils.java
@@ -0,0 +1,110 @@
+/*
+ * 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.util;
+
+/**
+ * This class contains utility methods for conversions, like
+ * a java.lang.String to an array of int or double.
+ */
+public final class ConversionUtils {
+
+    /**
+     * Converts the given base <code>String</code> into
+     * an array of <code>int</code>, splitting the base along the
+     * given separator pattern.
+     * <em>Note: this method assumes the input is a string containing 
+     * only decimal integers, signed or unsigned, that are parsable
+     * by <code>java.lang.Integer.parseInt(String)</code>. If this
+     * is not the case, the resulting <code>NumberFormatException</code>
+     * will have to be handled by the caller.</em>
+     * 
+     * @param baseString    the base string
+     * @param separatorPattern  the pattern separating the integer values
+     *        (if this is <code>null</code>, the baseString is parsed as one
+     *         integer value) 
+     * @return  an array of <code>int</code> whose size is equal to the number
+     *          values in the input string; <code>null</code> if this number
+     *          is equal to zero.
+     */
+    public static int[] toIntArray(String baseString, String separatorPattern) {
+        
+        if (baseString == null || "".equals(baseString)) {
+            return null;
+        }
+        
+        if (separatorPattern == null || "".equals(separatorPattern)) {
+            return new int[] { Integer.parseInt(baseString) };
+        }
+        
+        String[] values = baseString.split(separatorPattern);
+        int numValues = values.length;
+        if (numValues == 0) {
+            return null;
+        }
+        
+        int[] returnArray = new int[numValues];
+        for (int i = 0; i < numValues; ++i) {
+            returnArray[i] = Integer.parseInt(values[i]);
+        }
+        return returnArray;
+        
+    }
+
+    /**
+     * Converts the given base <code>String</code> into
+     * an array of <code>double</code>, splitting the base along the
+     * given separator pattern.
+     * <em>Note: this method assumes the input is a string containing 
+     * only decimal doubles, signed or unsigned, that are parsable
+     * by <code>java.lang.Double.parseDouble(String)</code>. If this
+     * is not the case, the resulting <code>NumberFormatException</code>
+     * will have to be handled by the caller.</em>
+     * 
+     * @param baseString    the base string
+     * @param separatorPattern  the pattern separating the integer values
+     *        (if this is <code>null</code>, the baseString is parsed as one
+     *         double value) 
+     * @return  an array of <code>double</code> whose size is equal to the number
+     *          values in the input string; <code>null</code> if this number
+     *          is equal to zero.
+     */
+    public static double[] toDoubleArray(String baseString, String separatorPattern) {
+        
+        if (baseString == null || "".equals(baseString)) {
+            return null;
+        }
+        
+        if (separatorPattern == null || "".equals(separatorPattern)) {
+            return new double[] { Double.parseDouble(baseString) };
+        }
+        
+        String[] values = baseString.split(separatorPattern);
+        int numValues = values.length;
+        if (numValues == 0) {
+            return null;
+        }
+        
+        double[] returnArray = new double[numValues];
+        for (int i = 0; i < numValues; ++i) {
+            returnArray[i] = Double.parseDouble(values[i]);
+        }
+        return returnArray;
+        
+    }
+    
+}