| /* |
| * 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. |
| */ |
| |
| package freemarker.core; |
| |
| import java.math.BigDecimal; |
| import java.math.BigInteger; |
| import java.util.HashMap; |
| import java.util.Map; |
| |
| import freemarker.template.TemplateException; |
| import freemarker.template.utility.NumberUtil; |
| import freemarker.template.utility.OptimizerUtil; |
| import freemarker.template.utility.StringUtil; |
| |
| /** |
| * Class to perform arithmetic operations. |
| */ |
| |
| public abstract class ArithmeticEngine { |
| |
| /** |
| * Arithmetic engine that converts all numbers to {@link BigDecimal} and |
| * then operates on them. This is FreeMarker's default arithmetic engine. |
| */ |
| public static final BigDecimalEngine BIGDECIMAL_ENGINE = new BigDecimalEngine(); |
| /** |
| * Arithmetic engine that uses (more-or-less) the widening conversions of |
| * Java language to determine the type of result of operation, instead of |
| * converting everything to BigDecimal up front. |
| */ |
| public static final ConservativeEngine CONSERVATIVE_ENGINE = new ConservativeEngine(); |
| |
| public abstract int compareNumbers(Number first, Number second) throws TemplateException; |
| public abstract Number add(Number first, Number second) throws TemplateException; |
| public abstract Number subtract(Number first, Number second) throws TemplateException; |
| public abstract Number multiply(Number first, Number second) throws TemplateException; |
| public abstract Number divide(Number first, Number second) throws TemplateException; |
| public abstract Number modulus(Number first, Number second) throws TemplateException; |
| |
| /** |
| * Should be able to parse all FTL numerical literals, Java Double toString results, and XML Schema numbers. |
| * This means these should be parsed successfully, except if the arithmetical engine |
| * couldn't support the resulting value anyway (such as NaN, infinite, even non-integers): |
| * {@code -123.45}, {@code 1.5e3}, {@code 1.5E3}, {@code 0005}, {@code +0}, {@code -0}, {@code NaN}, |
| * {@code INF}, {@code -INF}, {@code Infinity}, {@code -Infinity}. |
| */ |
| public abstract Number toNumber(String s); |
| |
| protected int minScale = 12; |
| protected int maxScale = 12; |
| protected int roundingPolicy = BigDecimal.ROUND_HALF_UP; |
| |
| /** |
| * Sets the minimal scale to use when dividing BigDecimal numbers. Default |
| * value is 12. |
| */ |
| public void setMinScale(int minScale) { |
| if (minScale < 0) { |
| throw new IllegalArgumentException("minScale < 0"); |
| } |
| this.minScale = minScale; |
| } |
| |
| /** |
| * Sets the maximal scale to use when multiplying BigDecimal numbers. |
| * Default value is 100. |
| */ |
| public void setMaxScale(int maxScale) { |
| if (maxScale < minScale) { |
| throw new IllegalArgumentException("maxScale < minScale"); |
| } |
| this.maxScale = maxScale; |
| } |
| |
| public void setRoundingPolicy(int roundingPolicy) { |
| if (roundingPolicy != BigDecimal.ROUND_CEILING |
| && roundingPolicy != BigDecimal.ROUND_DOWN |
| && roundingPolicy != BigDecimal.ROUND_FLOOR |
| && roundingPolicy != BigDecimal.ROUND_HALF_DOWN |
| && roundingPolicy != BigDecimal.ROUND_HALF_EVEN |
| && roundingPolicy != BigDecimal.ROUND_HALF_UP |
| && roundingPolicy != BigDecimal.ROUND_UNNECESSARY |
| && roundingPolicy != BigDecimal.ROUND_UP) { |
| throw new IllegalArgumentException("invalid rounding policy"); |
| } |
| |
| this.roundingPolicy = roundingPolicy; |
| } |
| |
| /** |
| * This is the default arithmetic engine in FreeMarker. It converts every |
| * number it receives into {@link BigDecimal}, then operates on these |
| * converted {@link BigDecimal}s. |
| */ |
| public static class BigDecimalEngine |
| extends |
| ArithmeticEngine { |
| @Override |
| public int compareNumbers(Number first, Number second) { |
| // We try to find the result based on the sign (+/-/0) first, because: |
| // - It's much faster than converting to BigDecial, and comparing to 0 is the most common comparison. |
| // - It doesn't require any type conversions, and thus things like "Infinity > 0" won't fail. |
| int firstSignum = NumberUtil.getSignum(first); |
| int secondSignum = NumberUtil.getSignum(second); |
| if (firstSignum != secondSignum) { |
| return firstSignum < secondSignum ? -1 : (firstSignum > secondSignum ? 1 : 0); |
| } else if (firstSignum == 0 && secondSignum == 0) { |
| return 0; |
| } else { |
| BigDecimal left = toBigDecimal(first); |
| BigDecimal right = toBigDecimal(second); |
| return left.compareTo(right); |
| } |
| } |
| |
| @Override |
| public Number add(Number first, Number second) { |
| BigDecimal left = toBigDecimal(first); |
| BigDecimal right = toBigDecimal(second); |
| return left.add(right); |
| } |
| |
| @Override |
| public Number subtract(Number first, Number second) { |
| BigDecimal left = toBigDecimal(first); |
| BigDecimal right = toBigDecimal(second); |
| return left.subtract(right); |
| } |
| |
| @Override |
| public Number multiply(Number first, Number second) { |
| BigDecimal left = toBigDecimal(first); |
| BigDecimal right = toBigDecimal(second); |
| BigDecimal result = left.multiply(right); |
| if (result.scale() > maxScale) { |
| result = result.setScale(maxScale, roundingPolicy); |
| } |
| return result; |
| } |
| |
| @Override |
| public Number divide(Number first, Number second) { |
| BigDecimal left = toBigDecimal(first); |
| BigDecimal right = toBigDecimal(second); |
| return divide(left, right); |
| } |
| |
| @Override |
| public Number modulus(Number first, Number second) { |
| long left = first.longValue(); |
| long right = second.longValue(); |
| return Long.valueOf(left % right); |
| } |
| |
| @Override |
| public Number toNumber(String s) { |
| return toBigDecimalOrDouble(s); |
| } |
| |
| private BigDecimal divide(BigDecimal left, BigDecimal right) { |
| int scale1 = left.scale(); |
| int scale2 = right.scale(); |
| int scale = Math.max(scale1, scale2); |
| scale = Math.max(minScale, scale); |
| return left.divide(right, scale, roundingPolicy); |
| } |
| } |
| |
| /** |
| * An arithmetic engine that conservatively widens the operation arguments |
| * to extent that they can hold the result of the operation. Widening |
| * conversions occur in following situations: |
| * <ul> |
| * <li>byte and short are always widened to int (alike to Java language).</li> |
| * <li>To preserve magnitude: when operands are of different types, the |
| * result type is the type of the wider operand.</li> |
| * <li>to avoid overflows: if add, subtract, or multiply would overflow on |
| * integer types, the result is widened from int to long, or from long to |
| * BigInteger.</li> |
| * <li>to preserve fractional part: if a division of integer types would |
| * have a fractional part, int and long are converted to double, and |
| * BigInteger is converted to BigDecimal. An operation on a float and a |
| * long results in a double. An operation on a float or double and a |
| * BigInteger results in a BigDecimal.</li> |
| * </ul> |
| */ |
| public static class ConservativeEngine extends ArithmeticEngine { |
| private static final int INTEGER = 0; |
| private static final int LONG = 1; |
| private static final int FLOAT = 2; |
| private static final int DOUBLE = 3; |
| private static final int BIGINTEGER = 4; |
| private static final int BIGDECIMAL = 5; |
| |
| private static final Map classCodes = createClassCodesMap(); |
| |
| @Override |
| public int compareNumbers(Number first, Number second) throws TemplateException { |
| switch(getCommonClassCode(first, second)) { |
| case INTEGER: { |
| int n1 = first.intValue(); |
| int n2 = second.intValue(); |
| return n1 < n2 ? -1 : (n1 == n2 ? 0 : 1); |
| } |
| case LONG: { |
| long n1 = first.longValue(); |
| long n2 = second.longValue(); |
| return n1 < n2 ? -1 : (n1 == n2 ? 0 : 1); |
| } |
| case FLOAT: { |
| float n1 = first.floatValue(); |
| float n2 = second.floatValue(); |
| return n1 < n2 ? -1 : (n1 == n2 ? 0 : 1); |
| } |
| case DOUBLE: { |
| double n1 = first.doubleValue(); |
| double n2 = second.doubleValue(); |
| return n1 < n2 ? -1 : (n1 == n2 ? 0 : 1); |
| } |
| case BIGINTEGER: { |
| BigInteger n1 = toBigInteger(first); |
| BigInteger n2 = toBigInteger(second); |
| return n1.compareTo(n2); |
| } |
| case BIGDECIMAL: { |
| BigDecimal n1 = toBigDecimal(first); |
| BigDecimal n2 = toBigDecimal(second); |
| return n1.compareTo(n2); |
| } |
| } |
| // Make the compiler happy. getCommonClassCode() is guaranteed to |
| // return only above codes, or throw an exception. |
| throw new Error(); |
| } |
| |
| @Override |
| public Number add(Number first, Number second) throws TemplateException { |
| switch(getCommonClassCode(first, second)) { |
| case INTEGER: { |
| int n1 = first.intValue(); |
| int n2 = second.intValue(); |
| int n = n1 + n2; |
| return |
| ((n ^ n1) < 0 && (n ^ n2) < 0) // overflow check |
| ? Long.valueOf(((long) n1) + n2) |
| : Integer.valueOf(n); |
| } |
| case LONG: { |
| long n1 = first.longValue(); |
| long n2 = second.longValue(); |
| long n = n1 + n2; |
| return |
| ((n ^ n1) < 0 && (n ^ n2) < 0) // overflow check |
| ? toBigInteger(first).add(toBigInteger(second)) |
| : Long.valueOf(n); |
| } |
| case FLOAT: { |
| return Float.valueOf(first.floatValue() + second.floatValue()); |
| } |
| case DOUBLE: { |
| return Double.valueOf(first.doubleValue() + second.doubleValue()); |
| } |
| case BIGINTEGER: { |
| BigInteger n1 = toBigInteger(first); |
| BigInteger n2 = toBigInteger(second); |
| return n1.add(n2); |
| } |
| case BIGDECIMAL: { |
| BigDecimal n1 = toBigDecimal(first); |
| BigDecimal n2 = toBigDecimal(second); |
| return n1.add(n2); |
| } |
| } |
| // Make the compiler happy. getCommonClassCode() is guaranteed to |
| // return only above codes, or throw an exception. |
| throw new Error(); |
| } |
| |
| @Override |
| public Number subtract(Number first, Number second) throws TemplateException { |
| switch(getCommonClassCode(first, second)) { |
| case INTEGER: { |
| int n1 = first.intValue(); |
| int n2 = second.intValue(); |
| int n = n1 - n2; |
| return |
| ((n ^ n1) < 0 && (n ^ ~n2) < 0) // overflow check |
| ? (Number) Long.valueOf(((long) n1) - n2) |
| : (Number) Integer.valueOf(n); |
| } |
| case LONG: { |
| long n1 = first.longValue(); |
| long n2 = second.longValue(); |
| long n = n1 - n2; |
| return |
| ((n ^ n1) < 0 && (n ^ ~n2) < 0) // overflow check |
| ? (Number) toBigInteger(first).subtract(toBigInteger(second)) |
| : (Number) Long.valueOf(n); |
| } |
| case FLOAT: { |
| return Float.valueOf(first.floatValue() - second.floatValue()); |
| } |
| case DOUBLE: { |
| return Double.valueOf(first.doubleValue() - second.doubleValue()); |
| } |
| case BIGINTEGER: { |
| BigInteger n1 = toBigInteger(first); |
| BigInteger n2 = toBigInteger(second); |
| return n1.subtract(n2); |
| } |
| case BIGDECIMAL: { |
| BigDecimal n1 = toBigDecimal(first); |
| BigDecimal n2 = toBigDecimal(second); |
| return n1.subtract(n2); |
| } |
| } |
| // Make the compiler happy. getCommonClassCode() is guaranteed to |
| // return only above codes, or throw an exception. |
| throw new Error(); |
| } |
| |
| @Override |
| public Number multiply(Number first, Number second) throws TemplateException { |
| switch(getCommonClassCode(first, second)) { |
| case INTEGER: { |
| int n1 = first.intValue(); |
| int n2 = second.intValue(); |
| int n = n1 * n2; |
| return |
| n1 == 0 || n / n1 == n2 // overflow check |
| ? (Number) Integer.valueOf(n) |
| : (Number) Long.valueOf(((long) n1) * n2); |
| } |
| case LONG: { |
| long n1 = first.longValue(); |
| long n2 = second.longValue(); |
| long n = n1 * n2; |
| return |
| n1 == 0L || n / n1 == n2 // overflow check |
| ? (Number) Long.valueOf(n) |
| : (Number) toBigInteger(first).multiply(toBigInteger(second)); |
| } |
| case FLOAT: { |
| return Float.valueOf(first.floatValue() * second.floatValue()); |
| } |
| case DOUBLE: { |
| return Double.valueOf(first.doubleValue() * second.doubleValue()); |
| } |
| case BIGINTEGER: { |
| BigInteger n1 = toBigInteger(first); |
| BigInteger n2 = toBigInteger(second); |
| return n1.multiply(n2); |
| } |
| case BIGDECIMAL: { |
| BigDecimal n1 = toBigDecimal(first); |
| BigDecimal n2 = toBigDecimal(second); |
| BigDecimal r = n1.multiply(n2); |
| return r.scale() > maxScale ? r.setScale(maxScale, roundingPolicy) : r; |
| } |
| } |
| // Make the compiler happy. getCommonClassCode() is guaranteed to |
| // return only above codes, or throw an exception. |
| throw new Error(); |
| } |
| |
| @Override |
| public Number divide(Number first, Number second) throws TemplateException { |
| switch(getCommonClassCode(first, second)) { |
| case INTEGER: { |
| int n1 = first.intValue(); |
| int n2 = second.intValue(); |
| if (n1 % n2 == 0) { |
| return Integer.valueOf(n1 / n2); |
| } |
| return Double.valueOf(((double) n1) / n2); |
| } |
| case LONG: { |
| long n1 = first.longValue(); |
| long n2 = second.longValue(); |
| if (n1 % n2 == 0) { |
| return Long.valueOf(n1 / n2); |
| } |
| return Double.valueOf(((double) n1) / n2); |
| } |
| case FLOAT: { |
| return Float.valueOf(first.floatValue() / second.floatValue()); |
| } |
| case DOUBLE: { |
| return Double.valueOf(first.doubleValue() / second.doubleValue()); |
| } |
| case BIGINTEGER: { |
| BigInteger n1 = toBigInteger(first); |
| BigInteger n2 = toBigInteger(second); |
| BigInteger[] divmod = n1.divideAndRemainder(n2); |
| if (divmod[1].equals(BigInteger.ZERO)) { |
| return divmod[0]; |
| } else { |
| BigDecimal bd1 = new BigDecimal(n1); |
| BigDecimal bd2 = new BigDecimal(n2); |
| return bd1.divide(bd2, minScale, roundingPolicy); |
| } |
| } |
| case BIGDECIMAL: { |
| BigDecimal n1 = toBigDecimal(first); |
| BigDecimal n2 = toBigDecimal(second); |
| int scale1 = n1.scale(); |
| int scale2 = n2.scale(); |
| int scale = Math.max(scale1, scale2); |
| scale = Math.max(minScale, scale); |
| return n1.divide(n2, scale, roundingPolicy); |
| } |
| } |
| // Make the compiler happy. getCommonClassCode() is guaranteed to |
| // return only above codes, or throw an exception. |
| throw new Error(); |
| } |
| |
| @Override |
| public Number modulus(Number first, Number second) throws TemplateException { |
| switch(getCommonClassCode(first, second)) { |
| case INTEGER: { |
| return Integer.valueOf(first.intValue() % second.intValue()); |
| } |
| case LONG: { |
| return Long.valueOf(first.longValue() % second.longValue()); |
| } |
| case FLOAT: { |
| return Float.valueOf(first.floatValue() % second.floatValue()); |
| } |
| case DOUBLE: { |
| return Double.valueOf(first.doubleValue() % second.doubleValue()); |
| } |
| case BIGINTEGER: { |
| BigInteger n1 = toBigInteger(first); |
| BigInteger n2 = toBigInteger(second); |
| return n1.mod(n2); |
| } |
| case BIGDECIMAL: { |
| throw new _MiscTemplateException("Can't calculate remainder on BigDecimals"); |
| } |
| } |
| // Make the compiler happy. getCommonClassCode() is guaranteed to |
| // return only above codes, or throw an exception. |
| throw new BugException(); |
| } |
| |
| @Override |
| public Number toNumber(String s) { |
| Number n = toBigDecimalOrDouble(s); |
| return n instanceof BigDecimal ? OptimizerUtil.optimizeNumberRepresentation(n) : n; |
| } |
| |
| private static Map createClassCodesMap() { |
| Map map = new HashMap(17); |
| Integer intcode = Integer.valueOf(INTEGER); |
| map.put(Byte.class, intcode); |
| map.put(Short.class, intcode); |
| map.put(Integer.class, intcode); |
| map.put(Long.class, Integer.valueOf(LONG)); |
| map.put(Float.class, Integer.valueOf(FLOAT)); |
| map.put(Double.class, Integer.valueOf(DOUBLE)); |
| map.put(BigInteger.class, Integer.valueOf(BIGINTEGER)); |
| map.put(BigDecimal.class, Integer.valueOf(BIGDECIMAL)); |
| return map; |
| } |
| |
| private static int getClassCode(Number num) throws TemplateException { |
| try { |
| return ((Integer) classCodes.get(num.getClass())).intValue(); |
| } catch (NullPointerException e) { |
| if (num == null) { |
| throw new _MiscTemplateException("The Number object was null."); |
| } else { |
| throw new _MiscTemplateException("Unknown number type ", num.getClass().getName()); |
| } |
| } |
| } |
| |
| private static int getCommonClassCode(Number num1, Number num2) throws TemplateException { |
| int c1 = getClassCode(num1); |
| int c2 = getClassCode(num2); |
| int c = c1 > c2 ? c1 : c2; |
| // If BigInteger is combined with a Float or Double, the result is a |
| // BigDecimal instead of BigInteger in order not to lose the |
| // fractional parts. If Float is combined with Long, the result is a |
| // Double instead of Float to preserve the bigger bit width. |
| switch(c) { |
| case FLOAT: { |
| if ((c1 < c2 ? c1 : c2) == LONG) { |
| return DOUBLE; |
| } |
| break; |
| } |
| case BIGINTEGER: { |
| int min = c1 < c2 ? c1 : c2; |
| if (min == DOUBLE || min == FLOAT) { |
| return BIGDECIMAL; |
| } |
| break; |
| } |
| } |
| return c; |
| } |
| |
| private static BigInteger toBigInteger(Number num) { |
| return num instanceof BigInteger ? (BigInteger) num : new BigInteger(num.toString()); |
| } |
| } |
| |
| private static BigDecimal toBigDecimal(Number num) { |
| try { |
| return num instanceof BigDecimal ? (BigDecimal) num : new BigDecimal(num.toString()); |
| } catch (NumberFormatException e) { |
| // The exception message is useless, so we add a new one: |
| throw new NumberFormatException("Can't parse this as BigDecimal number: " + StringUtil.jQuote(num)); |
| } |
| } |
| |
| private static Number toBigDecimalOrDouble(String s) { |
| if (s.length() > 2) { |
| char c = s.charAt(0); |
| if (c == 'I' && (s.equals("INF") || s.equals("Infinity"))) { |
| return Double.valueOf(Double.POSITIVE_INFINITY); |
| } else if (c == 'N' && s.equals("NaN")) { |
| return Double.valueOf(Double.NaN); |
| } else if (c == '-' && s.charAt(1) == 'I' && (s.equals("-INF") || s.equals("-Infinity"))) { |
| return Double.valueOf(Double.NEGATIVE_INFINITY); |
| } |
| } |
| return new BigDecimal(s); |
| } |
| |
| } |