org.lunifera.web.vaadin.components.validator.NumberBoundsValidator.java Source code

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Here is the source code for org.lunifera.web.vaadin.components.validator.NumberBoundsValidator.java

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/*******************************************************************************
 * Copyright (c) 2011-2013 Committers of lunifera.org
 * 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Florian Pirchner - initial API and implementation
 *******************************************************************************/
package org.lunifera.web.vaadin.components.validator;

import java.math.BigDecimal;
import com.vaadin.data.validator.AbstractValidator;

@SuppressWarnings("serial")
public class NumberBoundsValidator extends AbstractValidator<Number> {

    private BigDecimal maxValue;
    private boolean includeEqual_max;
    private BigDecimal minValue;
    private boolean includeEqual_min;

    private BigDecimal exactValue;
    private boolean exact;

    public NumberBoundsValidator(String errorMessage) {
        super(errorMessage);
    }

    /**
     * Only values that are greater than the given value will be accepted by
     * that validator. Values that do not match that constraint will be declined
     * and force and error.
     * 
     * @param value
     *            the value to set
     * @return
     */
    public NumberBoundsValidator greater(Number value) {
        resetExact();

        this.minValue = new BigDecimal(value.doubleValue());
        includeEqual_min = false;
        return this;
    }

    /**
     * Only values that are greater equal than the given value will be accepted
     * by that validator. Values that do not match that constraint will be
     * declined and force and error.
     * 
     * @param value
     *            the value to set
     * @return
     */
    public NumberBoundsValidator greaterEqual(Number value) {
        resetExact();

        this.minValue = new BigDecimal(value.doubleValue());
        includeEqual_min = true;
        return this;
    }

    /**
     * Only values that are lower than the given value will be accepted by that
     * validator. Values that do not match that constraint will be declined and
     * force and error.
     * 
     * @param value
     *            the value to set
     * @return
     */
    public NumberBoundsValidator lower(Number value) {
        resetExact();

        this.maxValue = new BigDecimal(value.doubleValue());
        includeEqual_max = false;
        return this;
    }

    /**
     * Only values that are lower equal than the given value will be accepted by
     * that validator. Values that do not match that constraint will be declined
     * and force and error.
     * 
     * @param value
     *            the value to set
     * @return
     */
    public NumberBoundsValidator lowerEqual(Number value) {
        resetExact();

        this.maxValue = new BigDecimal(value.doubleValue());
        includeEqual_max = true;
        return this;
    }

    /**
     * Only values that are equal the given value will be accepted by that
     * validator. Values that are greater or lower will be declined and force
     * and error.
     * 
     * @param value
     *            the value to set
     * @return
     */
    public NumberBoundsValidator equal(Number value) {
        maxValue = null;
        includeEqual_max = false;
        minValue = null;
        includeEqual_min = false;

        exactValue = new BigDecimal(value.doubleValue());
        exact = true;
        return this;
    }

    /**
     * Resets the internal "exact" state of that validator
     */
    private void resetExact() {
        exactValue = null;
        exact = false;
    }

    /**
     * @return the max
     */
    public Number getMax() {
        return maxValue;
    }

    /**
     * @return the min
     */
    public Number getMin() {
        return minValue;
    }

    @Override
    public boolean isValidValue(Number value) {

        BigDecimal input = new BigDecimal(value.doubleValue());
        boolean result = true;

        if (exact) {
            result = exactValue.compareTo(input) == 0;
        } else {
            if (maxValue != null) {
                int checkResult = maxValue.compareTo(input);
                if (includeEqual_max) {
                    result = result && checkResult >= 0;
                } else {
                    result &= checkResult == 1;
                }
            }

            if (minValue != null) {
                int checkResult = minValue.compareTo(input);
                if (includeEqual_min) {
                    result &= checkResult <= 0;
                } else {
                    result &= checkResult == -1;
                }
            }
        }

        return result;
    }

    @Override
    public Class<Number> getType() {
        return Number.class;
    }

}