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/*
* Copyright 1999-2004 The Apache Software Foundation.
*
* Licensed 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.fo.expr;
import org.apache.fop.datatypes.PercentBaseContext;
import org.apache.fop.datatypes.Numeric;
/**
* This class contains static methods to evaluate operations on Numeric
* operands. If the operands are absolute numerics the result is computed
* rigth away and a new absolute numeric is return. If one of the operands are
* relative a n operation node is created with the operation and the operands.
* The evaluation of the operation can then occur when getNumericValue() is
* called.
*/
public class NumericOp {
/**
* Add the two operands and return a new Numeric representing the result.
* @param op1 The first operand.
* @param op2 The second operand.
* @return A Numeric representing the result.
* @throws PropertyException If the dimension of the operand is different
* from the dimension of this Numeric.
*/
public static Numeric addition(Numeric op1, Numeric op2) throws PropertyException {
if (op1.isAbsolute() && op2.isAbsolute()) {
return addition2(op1, op2, null);
} else {
return new RelativeNumericProperty(RelativeNumericProperty.ADDITION, op1, op2);
}
}
public static Numeric addition2(Numeric op1, Numeric op2, PercentBaseContext context) throws PropertyException {
if (op1.getDimension() != op2.getDimension()) {
throw new PropertyException("Can't subtract Numerics of different dimensions");
}
return numeric(op1.getNumericValue(context) + op2.getNumericValue(context), op1.getDimension());
}
/**
* Add the second operand from the first and return a new Numeric
* representing the result.
* @param op1 The first operand.
* @param op2 The second operand.
* @return A Numeric representing the result.
* @throws PropertyException If the dimension of the operand is different
* from the dimension of this Numeric.
*/
public static Numeric subtraction(Numeric op1, Numeric op2) throws PropertyException {
if (op1.isAbsolute() && op2.isAbsolute()) {
return subtraction2(op1, op2, null);
} else {
return new RelativeNumericProperty(RelativeNumericProperty.SUBTRACTION, op1, op2);
}
}
public static Numeric subtraction2(Numeric op1, Numeric op2, PercentBaseContext context) throws PropertyException {
if (op1.getDimension() != op2.getDimension()) {
throw new PropertyException("Can't subtract Numerics of different dimensions");
}
return numeric(op1.getNumericValue(context) - op2.getNumericValue(context), op1.getDimension());
}
/**
* Multiply the two operands and return a new Numeric representing the
* result.
* @param op1 The first operand.
* @param op2 The second operand.
* @return A Numeric representing the result.
* @throws PropertyException If the dimension of the operand is different
* from the dimension of this Numeric.
*/
public static Numeric multiply(Numeric op1, Numeric op2) throws PropertyException {
if (op1.isAbsolute() && op2.isAbsolute()) {
return multiply2(op1, op2, null);
} else {
return new RelativeNumericProperty(RelativeNumericProperty.MULTIPLY, op1, op2);
}
}
public static Numeric multiply2(Numeric op1, Numeric op2, PercentBaseContext context) throws PropertyException {
return numeric(op1.getNumericValue(context) * op2.getNumericValue(context),
op1.getDimension() + op2.getDimension());
}
/**
* Divide the second operand into the first and return a new
* Numeric representing the
* result.
* @param op1 The first operand.
* @param op2 The second operand.
* @return A Numeric representing the result.
* @throws PropertyException If the dimension of the operand is different
* from the dimension of this Numeric.
*/
public static Numeric divide(Numeric op1, Numeric op2) throws PropertyException {
if (op1.isAbsolute() && op2.isAbsolute()) {
return divide2(op1, op2, null);
} else {
return new RelativeNumericProperty(RelativeNumericProperty.DIVIDE, op1, op2);
}
}
public static Numeric divide2(Numeric op1, Numeric op2, PercentBaseContext context) throws PropertyException {
return numeric(op1.getNumericValue(context) / op2.getNumericValue(context),
op1.getDimension() - op2.getDimension());
}
/**
* Return the remainder of a division of the two operand Numeric.
* @param op1 The first operand.
* @param op2 The second operand.
* @return A new Numeric object representing the absolute value.
*/
public static Numeric modulo(Numeric op1, Numeric op2) throws PropertyException {
if (op1.isAbsolute() && op2.isAbsolute()) {
return modulo2(op1, op2, null);
} else {
return new RelativeNumericProperty(RelativeNumericProperty.MODULO, op1, op2);
}
}
public static Numeric modulo2(Numeric op1, Numeric op2, PercentBaseContext context) throws PropertyException {
return numeric(op1.getNumericValue(context) % op2.getNumericValue(context), op1.getDimension());
}
/**
* Return the absolute value of a Numeric.
* @param op the operand.
* @return a new Numeric object representing the absolute value of the operand.
*/
public static Numeric abs(Numeric op) throws PropertyException {
if (op.isAbsolute()) {
return abs2(op, null);
} else {
return new RelativeNumericProperty(RelativeNumericProperty.ABS, op);
}
}
public static Numeric abs2(Numeric op, PercentBaseContext context) throws PropertyException {
return numeric(Math.abs(op.getNumericValue(context)), op.getDimension());
}
/**
* Return the negation of a Numeric.
* @param op the operand.
* @return a new Numeric object representing the negation of the operand.
*/
public static Numeric negate(Numeric op) throws PropertyException {
if (op.isAbsolute()) {
return negate2(op, null);
} else {
return new RelativeNumericProperty(RelativeNumericProperty.NEGATE, op);
}
}
public static Numeric negate2(Numeric op, PercentBaseContext context) throws PropertyException {
return numeric(- op.getNumericValue(context), op.getDimension());
}
/**
* Return the larger of the two Numerics.
* @param op1 The first operand.
* @param op2 The second operand.
* @return a Numeric which is the maximum of the two operands.
* @throws PropertyException if the dimensions or value types of the operands are different.
*/
public static Numeric max(Numeric op1, Numeric op2) throws PropertyException {
if (op1.isAbsolute() && op2.isAbsolute()) {
return max2(op1, op2, null);
} else {
return new RelativeNumericProperty(RelativeNumericProperty.MAX, op1, op2);
}
}
public static Numeric max2(Numeric op1, Numeric op2, PercentBaseContext context) throws PropertyException {
if (op1.getDimension() != op2.getDimension()) {
throw new PropertyException("Arguments to max() must have same dimensions");
}
return op1.getNumericValue(context) > op2.getNumericValue(context) ? op1 : op2;
}
/**
* Return the smaller of two Numerics.
* @param op1 The first operand.
* @param op2 The second operand.
* @return a Numeric which is the minimum of the two operands.
* @throws PropertyException if the dimensions or value types of the operands are different.
*/
public static Numeric min(Numeric op1, Numeric op2) throws PropertyException {
if (op1.isAbsolute() && op2.isAbsolute()) {
return min2(op1, op2, null);
} else {
return new RelativeNumericProperty(RelativeNumericProperty.MIN, op1, op2);
}
}
public static Numeric min2(Numeric op1, Numeric op2, PercentBaseContext context) throws PropertyException {
if (op1.getDimension() != op2.getDimension()) {
throw new PropertyException("Arguments to min() must have same dimensions");
}
return op1.getNumericValue(context) <= op2.getNumericValue(context) ? op1 : op2;
}
/**
* Create a new absolute numeric with the specified value and dimension.
* @param value
* @param dimension
* @return a new absolute numeric.
*/
private static Numeric numeric(double value, int dimension) {
return new NumericProperty(value, dimension);
}
}
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