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Geohash encoding and decoding utilities including bounding box coverage.

There is a newer version: 0.8.1

package com.github.davidmoten.geo.util;

/**
 * Guava like Preconditions.
 */
public final class Preconditions {

    /**
     * Constructor, private to prevent instantiation.
     */
    private Preconditions() {
        // do nothing
    }

    /**
     * Ensures the truth of an expression involving one or more parameters to
     * the calling method.
     * 
     * @param expression
     *            a boolean expression
     * @param errorMessage
     *            the exception message to use if the check fails; will be
     *            converted to a string using {@link String#valueOf(Object)}
     * @throws IllegalArgumentException
     *             if {@code expression} is false
     */
    public static void checkArgument(boolean expression, Object errorMessage) {
        if (!expression) {
            throw new IllegalArgumentException(String.valueOf(errorMessage));
        }
    }

    /**
     * Ensures that an object reference passed as a parameter to the calling
     * method is not null.
     * 
     * @param reference
     *            an object reference
     * @param errorMessage
     *            the exception message to use if the check fails; will be
     *            converted to a string using {@link String#valueOf(Object)}
     * @param 
     *            type of object reference
     * @return the non-null reference that was validated
     * @throws NullPointerException
     *             if {@code reference} is null
     */
    public static  T checkNotNull(T reference, Object errorMessage) {
        if (reference == null) {
            throw new NullPointerException(String.valueOf(errorMessage));
        }
        return reference;
    }
}