ch.javasoft.metabolic.efm.config.Arithmetic.java Source code

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Here is the source code for ch.javasoft.metabolic.efm.config.Arithmetic.java

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/*
 * =============================================================================
 * Simplified BSD License, see http://www.opensource.org/licenses/
 * -----------------------------------------------------------------------------
 * Copyright (c) 2008-2009, Marco Terzer, Zurich, Switzerland
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are met:
 * 
 *     * Redistributions of source code must retain the above copyright notice, 
 *       this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of the Swiss Federal Institute of Technology Zurich 
 *       nor the names of its contributors may be used to endorse or promote 
 *       products derived from this software without specific prior written 
 *       permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS 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 COPYRIGHT OWNER OR CONTRIBUTORS BE 
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 * CONSEQUENTIAL DAMAGES (INCLUDING, 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.
 * =============================================================================
 */
package ch.javasoft.metabolic.efm.config;

import java.math.BigInteger;
import java.util.Arrays;

import org.dom4j.Attribute;

import ch.javasoft.math.BigFraction;
import ch.javasoft.math.NumberOperations;
import ch.javasoft.math.varint.VarIntNumber;
import ch.javasoft.metabolic.efm.column.BigIntegerColumn;
import ch.javasoft.metabolic.efm.column.ColumnHome;
import ch.javasoft.metabolic.efm.column.DoubleColumn;
import ch.javasoft.metabolic.efm.column.FractionalColumn;
import ch.javasoft.metabolic.efm.column.RawBigIntegerColumn;
import ch.javasoft.metabolic.efm.column.VarIntColumn;
import ch.javasoft.util.numeric.Zero;
import ch.javasoft.xml.config.XmlConfigException;

public enum Arithmetic {
    double_ {
        @Override
        public ColumnHome<Double, DoubleColumn> getColumnHome() {
            return DoubleColumn.HOME;
        }

        @Override
        public Zero getDefaultZero() {
            return new Zero();
        }

        @Override
        public boolean isExact() {
            return false;
        }
    },
    fractional {
        @Override
        public ColumnHome<BigFraction, FractionalColumn> getColumnHome() {
            return FractionalColumn.HOME;
        }

        @Override
        public Zero getDefaultZero() {
            return new Zero(0d);
        }

        @Override
        public boolean isExact() {
            return true;
        }
    },
    bigint {
        @Override
        public ColumnHome<BigInteger, BigIntegerColumn> getColumnHome() {
            return BigIntegerColumn.HOME;
        }

        @Override
        public Zero getDefaultZero() {
            return new Zero(0d);
        }

        @Override
        public boolean isExact() {
            return true;
        }
    },
    rawint {
        @Override
        public ColumnHome<BigInteger, RawBigIntegerColumn> getColumnHome() {
            return RawBigIntegerColumn.HOME;
        }

        @Override
        public Zero getDefaultZero() {
            return new Zero(0d);
        }

        @Override
        public boolean isExact() {
            return true;
        }
    },
    varint {
        @Override
        public ColumnHome<VarIntNumber, VarIntColumn> getColumnHome() {
            return VarIntColumn.HOME;
        }

        @Override
        public Zero getDefaultZero() {
            return new Zero(0d);
        }

        @Override
        public boolean isExact() {
            return true;
        }
    };

    public static Arithmetic parse(String name) throws IllegalArgumentException {
        try {
            return valueOf(name.toLowerCase());
        } catch (IllegalArgumentException ex) {
            try {
                return valueOf(name.toLowerCase() + "_");
            } catch (IllegalArgumentException ex2) {
                throw new IllegalArgumentException("invalid value for arithmetic, expected "
                        + Arrays.toString(values()) + ", but found: " + name);
            }
        }
    }

    public static Arithmetic parse(Attribute attribute) throws XmlConfigException {
        try {
            return parse(attribute.getValue());
        } catch (IllegalArgumentException ex) {
            throw new XmlConfigException(ex.getLocalizedMessage(), attribute);
        }
    }

    public String getNiceName() {
        final String name = name();
        return name.endsWith("_") ? name.substring(0, name.length() - 1) : name;
    }

    @Override
    public String toString() {
        return getNiceName();
    }

    public NumberOperations<?> getNumberOperations() {
        return getColumnHome().getNumberOperations();
    }

    /**
     * Returns true if this arithmetic is exact, and false if truncation or
     * rounding might occur due to arithmetic operations.
     */
    abstract public boolean isExact();

    abstract public ColumnHome<?, ?> getColumnHome();

    abstract public Zero getDefaultZero();
}