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JSefa (Java Simple exchange format api) is a simple library for stream-based serialization of java objects to XML, CSV, FLR or any other format and back again using an iterator-style interface independent of the serialization format. The mapping between java object types and types of the serialization format (e. g. xml complex element types) can be defined either by annotating the java classes or programmatically using a simple API. The current implementation supports XML, CSV and FLR - for XML it is based on JSR 173.

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/*
 * Copyright 2007 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * 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 net.sf.jsefa.common.validator;

import static net.sf.jsefa.common.validator.ValidationErrorCodes.OUT_OF_RANGE;

import java.util.ArrayList;
import java.util.Collection;

/**
 * A validator for Number values.
 * 
 * @author Norman Lahme-Huetig
 * 
 * @param  the type of the number
 * 
 */
public abstract class NumberValidator implements Validator {
    
    private static final String MIN = "min";
    private static final String MAX = "max";
    
    private final T min;
    private final T max;
    
    private final ConstraintsAccessor constraintsAccessor;
    
    /**
     * Constructs a new NumberValidator.
     * @param constraintsAccessor the accessor to the configured constraints
     */
    @SuppressWarnings("unchecked")
    protected NumberValidator(ConstraintsAccessor constraintsAccessor) {
        this.constraintsAccessor = constraintsAccessor;
        this.min = (T) constraintsAccessor.get(MIN, false);
        this.max = (T) constraintsAccessor.get(MAX, false);
    }
    
    /**
     * {@inheritDoc}
     */
    @SuppressWarnings("unchecked")
    public ValidationResult validate(Object value) {
        T number = (T) value;
        Collection errors = new ArrayList();
        validateMin(number, errors);
        validateMax(number, errors);
        return ValidationResult.create(errors);
    }
    
    /**
     * @return the constraints accessor
     */
    protected ConstraintsAccessor getConstraintsAccessor() {
        return this.constraintsAccessor;
    }
    
    private void validateMin(T value, Collection errors) {
        if (this.min != null && compare(value, this.min) < 0) {
            String errorText = "The value " + value + " falls below the minimum value " + this.min;
            errors.add(ValidationError.create(OUT_OF_RANGE, errorText));
        }
    }
    
    private void validateMax(T value, Collection errors) {
        if (this.max != null && compare(value, this.max) > 0) {
            String errorText = "The value " + value + " exceeds the maximum value " + this.max;
            errors.add(ValidationError.create(OUT_OF_RANGE, errorText));
        }
    }
    
    @SuppressWarnings("unchecked")
    private int compare(Object valueA, Object valueB) {
        return ((Comparable) valueA).compareTo((T) valueB);
    }
    
    

}