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EasyMock provides an easy way to create Mock Objects for interfaces and classes generating them on the fly

There is a newer version: 5.5.0

/*
 * Copyright (c) 2001-2005 OFFIS, Tammo Freese.
 * This program is made available under the terms of the MIT License.
 */
package org.easymock.internal;

public class Range {
    private int minimum;

    private int maximum;

    public Range(int count) {
        this(count, count);
    }

    public Range(int minimum, int maximum) {
        if (!(minimum <= maximum)) {
            throw new RuntimeExceptionWrapper(new IllegalArgumentException(
                    "minimum must be <= maximum"));
        }

        if (!(minimum >= 0)) {
            throw new RuntimeExceptionWrapper(new IllegalArgumentException(
                    "minimum must be >= 0"));
        }

        if (!(maximum >= 1)) {
            throw new RuntimeExceptionWrapper(new IllegalArgumentException(
                    "maximum must be >= 1"));
        }
        this.minimum = minimum;
        this.maximum = maximum;
    }

    public boolean hasFixedCount() {
        return minimum == maximum;
    }

    public int getMaximum() {
        return maximum;
    }

    public int getMinimum() {
        return minimum;
    }

    public String toString() {
        if (hasFixedCount()) {
            return "" + minimum;
        } else if (hasOpenCount()) {
            return "at least " + minimum;
        } else {
            return "between " + minimum + " and " + maximum;
        }
    }

    public String expectedAndActual(int count) {
        return "expected: " + this.toString() + ", actual: " + count;
    }

    public boolean contains(int count) {
        return minimum <= count && count <= maximum;
    }

    public boolean hasOpenCount() {
        return maximum == Integer.MAX_VALUE;
    }
}