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- /*
- * $Id$
- * ============================================================================
- * The Apache Software License, Version 1.1
- * ============================================================================
- *
- * Copyright (C) 1999-2003 The Apache Software Foundation. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without modifica-
- * tion, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- *
- * 3. The end-user documentation included with the redistribution, if any, must
- * include the following acknowledgment: "This product includes software
- * developed by the Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowledgment may appear in the software itself, if
- * and wherever such third-party acknowledgments normally appear.
- *
- * 4. The names "FOP" and "Apache Software Foundation" must not be used to
- * endorse or promote products derived from this software without prior
- * written permission. For written permission, please contact
- * apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache", nor may
- * "Apache" appear in their name, without prior written permission of the
- * Apache Software Foundation.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES,
- * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
- * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * APACHE SOFTWARE FOUNDATION OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
- * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLU-
- * DING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
- * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- * ============================================================================
- *
- * This software consists of voluntary contributions made by many individuals
- * on behalf of the Apache Software Foundation and was originally created by
- * James Tauber <jtauber@jtauber.com>. For more information on the Apache
- * Software Foundation, please see <http://www.apache.org/>.
- */
- package org.apache.fop.fo.expr;
-
- import org.apache.fop.datatypes.Numeric;
- import org.apache.fop.datatypes.Length;
- import org.apache.fop.fo.properties.Property;
-
-
- /**
- * This class represent a node in a property expression tree.
- * It is created when an operation involve relative expression and is used
- * to delay evaluation of the operation until the time where getNumericValue()
- * or getValue() is called.
- */
- public class RelativeNumericProperty extends Property implements Numeric, Length {
- public static final int ADDITION = 1;
- public static final int SUBTRACTION = 2;
- public static final int MULTIPLY = 3;
- public static final int DIVIDE = 4;
- public static final int MODULO = 5;
- public static final int NEGATE = 6;
- public static final int ABS = 7;
- public static final int MAX = 8;
- public static final int MIN = 9;
-
- // Used in the toString() method, indexed by operation id.
- private static String operations = " +-*/%";
-
- /**
- * The operation identifier.
- */
- private int operation;
- /**
- * The first (or only) operand.
- */
- private Numeric op1;
- /**
- * The second operand.
- */
- private Numeric op2;
- /**
- * The dimension of the result.
- */
- private int dimension;
-
- /**
- * Constructor for a two argument operation.
- * @param operation the operation opcode: ADDITION, SUBTRACTION, ...
- * @param op1 the first operand.
- * @param op2 the second operand
- */
- public RelativeNumericProperty(int operation, Numeric op1, Numeric op2) {
- this.operation = operation;
- this.op1 = op1;
- this.op2 = op2;
- // Calculate the dimension. We can do now.
- switch (operation) {
- case MULTIPLY:
- dimension = op1.getDimension() + op2.getDimension();
- break;
- case DIVIDE:
- dimension = op1.getDimension() - op2.getDimension();
- break;
- default:
- dimension = op1.getDimension();
- }
- }
-
- /**
- * Constructor for a one argument operation.
- * @param operation the operation opcode: NEGATE, ABS
- * @param op the operand.
- */
- public RelativeNumericProperty(int operation, Numeric op) {
- this.operation = operation;
- this.op1 = op;
- this.dimension = op.getDimension();
- }
-
- /**
- * Return a resolved (calculated) Numeric with the value of the expression.
- * @throws PropertyException when an exception occur during evaluation.
- */
- private Numeric getResolved() throws PropertyException {
- Numeric n;
- switch (operation) {
- case ADDITION:
- return NumericOp.addition2(op1, op2);
- case SUBTRACTION:
- return NumericOp.subtraction2(op1, op2);
- case MULTIPLY:
- return NumericOp.multiply2(op1, op2);
- case DIVIDE:
- return NumericOp.divide2(op1, op2);
- case MODULO:
- return NumericOp.modulo2(op1, op2);
- case NEGATE:
- return NumericOp.negate2(op1);
- case ABS:
- return NumericOp.abs2(op1);
- case MAX:
- return NumericOp.max2(op1, op2);
- case MIN:
- return NumericOp.min2(op1, op2);
- default:
- throw new PropertyException("Unknown expr operation " + operation);
- }
- }
-
- /**
- * Return the resolved (calculated) value of the expression.
- * @see Numeric#getNumericValue()
- */
- public double getNumericValue() throws PropertyException {
- return getResolved().getNumericValue();
- }
-
- /**
- * Return the dimension of the expression
- */
- public int getDimension() {
- return dimension;
- }
-
- /**
- * Return false since an expression is only created when there is relative
- * numerics involved.
- */
- public boolean isAbsolute() {
- return false;
- }
-
- /**
- * Cast this numeric as a Length.
- */
- public Length getLength() {
- if (dimension == 1) {
- return this;
- }
- System.err.print("Can't create length with dimension " + dimension);
- return null;
- }
-
- public Numeric getNumeric() {
- return this;
- }
-
- /**
- * Return a resolved length.
- */
- public int getValue() {
- try {
- return (int) getNumericValue();
- } catch (PropertyException exc) {
- exc.printStackTrace();
- }
- return 0;
- }
-
- /**
- * Return false, since a numeric is never the "auto" enum.
- */
- public boolean isAuto() {
- return false;
- }
-
- /**
- * Return a string represention of the expression. Only used for debugging.
- */
- public String toString() {
- switch (operation) {
- case ADDITION: case SUBTRACTION:
- case DIVIDE: case MULTIPLY: case MODULO:
- return "(" + op1 + " " + operations.charAt(operation) + op2 + ")";
- case NEGATE:
- return "-" + op1;
- case MAX:
- return "max(" + op1 + ", " + op2 + ")";
- case MIN:
- return "min(" + op1 + ", " + op2 + ")";
- case ABS:
- return "abs(" + op1 + ")";
- }
- return "unknown operation " + operation;
- }
- }
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