128 lines
3.2 KiB
Java
128 lines
3.2 KiB
Java
// validating/GuavaPreconditions.java
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// (c)2017 MindView LLC: see Copyright.txt
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// We make no guarantees that this code is fit for any purpose.
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// Visit http://OnJava8.com for more book information.
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// Demonstrating Guava Preconditions
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import java.util.function.*;
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import static com.google.common.base.Preconditions.*;
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public class GuavaPreconditions {
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static void test(Consumer<String> c, String s) {
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try {
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System.out.println(s);
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c.accept(s);
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System.out.println("Success");
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} catch(Exception e) {
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String type = e.getClass().getSimpleName();
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String msg = e.getMessage();
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System.out.println(type +
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(msg == null ? "" : ": " + msg));
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}
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}
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public static void main(String[] args) {
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test(s -> s = checkNotNull(s), "X");
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test(s -> s = checkNotNull(s), null);
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test(s -> s = checkNotNull(s, "s was null"), null);
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test(s -> s = checkNotNull(
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s, "s was null, %s %s", "arg2", "arg3"), null);
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test(s -> checkArgument(s == "Fozzie"), "Fozzie");
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test(s -> checkArgument(s == "Fozzie"), "X");
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test(s -> checkArgument(s == "Fozzie"), null);
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test(s -> checkArgument(
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s == "Fozzie", "Bear Left!"), null);
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test(s -> checkArgument(
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s == "Fozzie", "Bear Left! %s Right!", "Frog"),
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null);
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test(s -> checkState(s.length() > 6), "Mortimer");
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test(s -> checkState(s.length() > 6), "Mort");
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test(s -> checkState(s.length() > 6), null);
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test(s ->
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checkElementIndex(6, s.length()), "Robert");
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test(s ->
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checkElementIndex(6, s.length()), "Bob");
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test(s ->
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checkElementIndex(6, s.length()), null);
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test(s ->
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checkPositionIndex(6, s.length()), "Robert");
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test(s ->
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checkPositionIndex(6, s.length()), "Bob");
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test(s ->
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checkPositionIndex(6, s.length()), null);
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test(s -> checkPositionIndexes(
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0, 6, s.length()), "Hieronymus");
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test(s -> checkPositionIndexes(
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0, 10, s.length()), "Hieronymus");
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test(s -> checkPositionIndexes(
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0, 11, s.length()), "Hieronymus");
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test(s -> checkPositionIndexes(
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-1, 6, s.length()), "Hieronymus");
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test(s -> checkPositionIndexes(
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7, 6, s.length()), "Hieronymus");
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test(s -> checkPositionIndexes(
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0, 6, s.length()), null);
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}
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}
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/* Output:
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X
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Success
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null
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NullPointerException
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null
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NullPointerException: s was null
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null
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NullPointerException: s was null, arg2 arg3
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Fozzie
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Success
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X
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IllegalArgumentException
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null
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IllegalArgumentException
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null
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IllegalArgumentException: Bear Left!
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null
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IllegalArgumentException: Bear Left! Frog Right!
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Mortimer
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Success
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Mort
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IllegalStateException
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null
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NullPointerException
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Robert
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IndexOutOfBoundsException: index (6) must be less
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than size (6)
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Bob
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IndexOutOfBoundsException: index (6) must be less
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than size (3)
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null
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NullPointerException
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Robert
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Success
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Bob
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IndexOutOfBoundsException: index (6)
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must not be greater
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than size (3)
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null
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NullPointerException
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Hieronymus
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Success
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Hieronymus
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Success
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Hieronymus
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IndexOutOfBoundsException: end index (11)
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must not be greater
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than size (10)
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Hieronymus
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IndexOutOfBoundsException: start index (-1)
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must not be negative
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Hieronymus
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IndexOutOfBoundsException: end index (6)
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must not be less than start index (7)
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null
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NullPointerException
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*/
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