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A Java library to parse, migrate and validate crons as well as describe them in human readable language
There is a newer version: 9.2.1
/*
 * Copyright 2014 jmrozanec
 * 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 com.cronutils.model.field.constraint;

import java.io.Serializable;
import java.util.Collections;
import java.util.Map;
import java.util.Set;

import com.cronutils.model.field.value.SpecialChar;
import com.cronutils.utils.Preconditions;

/**
 * Holds information on valid values for a field and allows to perform mappings and validations. Example of information for valid field
 * values: int range, valid special characters, valid nominal values. Example for mappings: conversions from nominal values to integers and
 * integer-integer mappings if more than one integer represents the same concept.
 */
public class FieldConstraints implements Serializable {

    private static final long serialVersionUID = -9112124669329704710L;
    private final Map stringMapping;
    private final Map intMapping;
    private final Set specialChars;
    private final Integer startRange;
    private final Integer endRange;

    /**
     * Constructor.
     *
     * @param specialChars - allowed special chars.
     * @param startRange   - lowest possible value
     * @param endRange     - highest possible value
     */
    public FieldConstraints(final Map stringMapping, final Map intMapping, final Set specialChars, final int startRange,
            final int endRange) {
        this.stringMapping = Collections.unmodifiableMap(Preconditions.checkNotNull(stringMapping, "String mapping must not be null"));
        this.intMapping = Collections.unmodifiableMap(Preconditions.checkNotNull(intMapping, "Integer mapping must not be null"));
        this.specialChars = Collections.unmodifiableSet(Preconditions.checkNotNull(specialChars, "Special (non-standard) chars set must not be null"));
        this.startRange = startRange;
        this.endRange = endRange;
    }

    public int getStartRange() {
        return startRange;
    }

    public int getEndRange() {
        return endRange;
    }

    public Set getSpecialChars() {
        return specialChars;
    }

    /**
     * Check if given number is greater or equal to start range and minor or equal to end range.
     *
     * @param value - to be checked
     */
    public boolean isInRange(final int value) {
        return value >= getStartRange() && value <= getEndRange();
    }

    /**
     * Check if given period is compatible with the given range.
     *
     * @param period - to be checked
     * @return {@code true} if period is compatible, {@code false} otherwise.
     */
    public boolean isPeriodInRange(final int period) {
        return period > 0 && period <= getEndRange() - getStartRange();
    }

    public Set getStringMappingKeySet() {
        return stringMapping.keySet();
    }

    public Integer getStringMappingValue(final String exp) {
        return stringMapping.get(exp);
    }

    public Integer getIntMappingValue(final Integer exp) {
        return intMapping.get(exp);
    }

}