com.sciencegadgets.client.algebra.transformations.NumberTransformations.java Source code

Introduction

Here is the source code for com.sciencegadgets.client.algebra.transformations.NumberTransformations.java

Source

/*******************************************************************************
 *     This file is part of ScienceGadgets, a collection of educational tools
 *     Copyright (C) 2012-2015 by John Gralyan
 *
 *     ScienceGadgets is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU Affero General Public License as
 *     published by the Free Software Foundation, either version 3 of
 *     the License, or (at your option) any later version.
 *
 *     ScienceGadgets is distributed in the hope that it will be useful,
 *     but WITHOUT ANY WARRANTY; without even the implied warranty of
 *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *     GNU Affero General Public License for more details.
 *
 *     You should have received a copy of the GNU Affero General Public License
 *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *     
 *     Contact us at info@sciencegadgets.org
 *******************************************************************************/
package com.sciencegadgets.client.algebra.transformations;

import java.util.LinkedHashSet;

import com.google.gwt.user.client.ui.Label;
import com.sciencegadgets.client.Moderator;
import com.sciencegadgets.client.algebra.EquationTree.EquationNode;
import com.sciencegadgets.client.entities.users.Badge;
import com.sciencegadgets.client.ui.CSS;
import com.sciencegadgets.client.ui.Prompt;
import com.sciencegadgets.shared.TypeSGET;
import com.sciencegadgets.shared.TypeSGET.Operator;

public class NumberTransformations extends TransformationList<NumberTransformationButton> {
    private static final long serialVersionUID = -7824994598553847333L;

    EquationNode numberNode;

    NumberTransformations(EquationNode numberNode) {
        super(numberNode);

        this.numberNode = numberNode;

        add(factorizeNumbers_check());
        add(unitConversion_check());
    }

    /**
     * List the factors of the number as buttons to choose in a prompt
     */
    private FactorNumberPromptButton factorizeNumbers_check() {
        Integer number;
        try {
            number = Integer.parseInt(numberNode.getSymbol());
        } catch (NumberFormatException e) {
            return null;
        }
        if (number == 1) {
            return null;
        }

        return new FactorNumberPromptButton(number, this);
    }

    /**
     * Checks if there is a unit attribute
     */
    private UnitConversionButton unitConversion_check() {
        if (!"".equals(numberNode.getUnitAttribute().toString())) {
            return new UnitConversionButton(this);
        }
        return null;
    }

}

// /////////////////////////////////////////////////////////////
// Transformation Buttons
// ////////////////////////////////////////////////////////////

abstract class NumberTransformationButton extends TransformationButton {

    protected EquationNode numberNode;

    NumberTransformationButton(String html, final NumberTransformations context) {
        super(html, context);
        addStyleName(CSS.NUMBER);

        this.numberNode = context.numberNode;
    }
}

/**
 * Decompose - factor number
 */
class FactorNumberPromptButton extends NumberTransformationButton {
    private Integer number;
    private NumberTransformations context;

    public FactorNumberPromptButton(final Integer number, final NumberTransformations context) {
        super("Factor", context);
        this.number = number;
        this.context = context;
    }

    @Override
    public Badge getAssociatedBadge() {
        return null;
    }

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

    @Override
    public void transform() {
        LinkedHashSet<Integer> primeFactors = AlgebraicTransformations.FIND_PRIME_FACTORS(number);

        Prompt prompt = new Prompt(false);
        Label title = new Label();
        title.setText("" + number);
        title.setHeight("20%");
        prompt.add(title);
        for (Integer factor : primeFactors) {
            prompt.add(new FactorNumberButton(factor, number / factor, prompt, context));
        }
        prompt.appear();
    }

    class FactorNumberButton extends NumberTransformationButton {
        private int factor;
        private Prompt prompt;

        FactorNumberButton(final int factor, final int cofactor, final Prompt prompt,
                final NumberTransformations context) {
            super(factor + " " + Operator.getMultiply().getSign() + " " + cofactor, context);
            this.factor = factor;
            this.prompt = prompt;
            setSize("50%", "50%");
        }

        @Override
        public Badge getAssociatedBadge() {
            return Badge.FACTOR_NUMBERS;
        }

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

        @Override
        public void transform() {
            String original = numberNode.getSymbol();
            int factored = Integer.parseInt(original) / factor;

            if (context.reloadAlgebraActivity) {
                numberNode.highlight();
            }

            EquationNode parent = numberNode.encase(TypeSGET.Term);
            int index = numberNode.getIndex();
            EquationNode op = parent.addBefore(index, TypeSGET.Operation, Operator.getMultiply().getSign());
            parent.addBefore(index, TypeSGET.Number, factor + "");

            numberNode.setSymbol(factored + "");

            onTransformationEnd(original + " = " + factor + " " + Operator.getMultiply().getSign() + " " + factored,
                    op);

            prompt.disappear();
        }
    }

}

/**
 * Switches to unit conversion mode
 * 
 */
class UnitConversionButton extends NumberTransformationButton {
    UnitConversionButton(final NumberTransformations context) {
        super("Convert Units", context);
    }

    @Override
    public Badge getAssociatedBadge() {
        return null;
    }

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

    @Override
    public void transform() {
        Moderator.switchToConversion(numberNode//, null
        );
    }
}