/*
 * Copyright (C) 2005 Alfresco, Inc.
 *
 * Licensed under the Mozilla Public License version 1.1 
 * with a permitted attribution clause. You may obtain a
 * copy of the License at
 *
 *   http://www.alfresco.org/legal/license.txt
 *
 * 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.
 */
package org.alfresco.repo.dictionary.constraint;

import org.alfresco.service.cmr.dictionary.ConstraintException;
import org.alfresco.service.cmr.dictionary.DictionaryException;
import org.alfresco.service.cmr.repository.datatype.DefaultTypeConverter;

/**
 * Constraint implementation that ensures that the value is a numeric value bewteen a given
 * minimum and maximum value.  If a minimum or maximum value are not provided, then the JAVA
 * Double's {@link Double#MIN_VALUE minimum value} or {@link Double#MAX_VALUE maximum value}
 * are assumed.
 * 
 * @see #setMinValue(double)
 * @see #setMaxValue(double)
 * @see java.lang.Double#parseDouble(java.lang.String)
 * 
 * @author Derek Hulley
 */
public class NumericRangeConstraint extends AbstractConstraint
{
    private static final String ERR_INVALID_MIN_VALUE = "d_dictionary.constraint.numeric_range.invalid_min_value";
    private static final String ERR_INVALID_MAX_VALUE = "d_dictionary.constraint.numeric_range.invalid_max_value";
    private static final String ERR_NON_NUMERIC = "d_dictionary.constraint.numeric_range.non_numeric";
    private static final String ERR_OUT_OF_RANGE = "d_dictionary.constraint.numeric_range.out_of_range";
    
    private double minValue = Double.MIN_VALUE;
    private double maxValue = Double.MAX_VALUE;
    
    @Override
    public String toString()
    {
        StringBuilder sb = new StringBuilder(80);
        sb.append("NumericRangeConstraint")
          .append("[ minValue=").append(minValue)
          .append(", maxValue=").append(maxValue)
          .append("]");
        return sb.toString();
    }

    /**
     * @return Returns the minimum value allowed by the constraint
     */
    public double getMinValue()
    {
        return minValue;
    }

    /**
     * Set the minimum value allowed, which can be any value between
     * {@link Double#MIN_VALUE} and {@link Double#MAX_VALUE}.
     * 
     * @param minValue the minimum value allowed by the constraint
     */
    public void setMinValue(double minValue)
    {
        if (minValue > this.maxValue)
        {
            throw new DictionaryException(ERR_INVALID_MIN_VALUE, minValue);
        }
        this.minValue = minValue;
    }

    /**
     * @return Returns the minimum value allowed by the constraint
     */
    public double getMaxValue()
    {
        return maxValue;
    }

    /**
     * Set the maximum value allowed, which can be any value between
     * {@link Double#MIN_VALUE} and {@link Double#MAX_VALUE}.
     * 
     * @param maxValue the minimum value allowed by the constraint
     */
    public void setMaxValue(double maxValue)
    {
        if (maxValue < this.minValue)
        {
            throw new DictionaryException(ERR_INVALID_MAX_VALUE, minValue);
        }
        this.maxValue = maxValue;
    }
    
    public void initialize()
    {
    }

    protected void evaluateSingleValue(Object value)
    {
        // ensure that the value can be converted to a double
        double checkValue = Double.NaN;
        try
        {
            checkValue = DefaultTypeConverter.INSTANCE.doubleValue(value);
        }
        catch (NumberFormatException e)
        {
            throw new ConstraintException(ERR_NON_NUMERIC, value);
        }
        
        // Infinity and NaN cannot match
        if (Double.isInfinite(checkValue) || Double.isNaN(checkValue))
        {
            throw new ConstraintException(ERR_OUT_OF_RANGE, checkValue, minValue, maxValue);
        }
        
        // Check that the value is in range
        if (checkValue > maxValue || checkValue < minValue)
        {
            throw new ConstraintException(ERR_OUT_OF_RANGE, checkValue, minValue, maxValue);
        }
    }
}