matchTest.java

package com.googlecode.totallylazy;

import org.junit.Test;

import java.util.Date;

import static com.googlecode.totallylazy.Option.some;
import static com.googlecode.totallylazy.Sequences.sequence;
import static com.googlecode.totallylazy.matchers.Matchers.is;
import static com.googlecode.totallylazy.regex.Regex.regex;
import static com.googlecode.totallylazy.time.Dates.date;
import static java.lang.Integer.parseInt;
import static org.hamcrest.MatcherAssert.assertThat;

public class matchTest {
    @Test
    public void canDeconstructTypes() throws Exception {
        assertThat(new match<String, Date>(regex("(\\d{4})/(\\d{1,2})/(\\d{1,2})")) {
                Date value(String year, String month, String day) { return date(parseInt(year), parseInt(month), parseInt(day)); }
        }.apply("1977/1/10").get(), is(date(1977, 1, 10)));
    }

    @Test
    public void worksAsAFunction() throws Exception {
        assertThat(sequence(1, "2", date(2001, 1, 2)).flatMap(new match<Object,String>() {
            String value(Date s) { return "Date"; }
            String value(Integer s) { return "Integer"; }
        }), is(sequence("Integer", "Date")));
    }

    @Test
    public void worksWithInstances() throws Exception {
        assertThat(new match<String,String>() {
            String value(String s) { return "String"; }
            String value(CharSequence s) { return "CharSequence"; }
            String value(Integer s) { return "Integer"; }
        }.apply("A String").get(), is("String"));
    }

    @Test
    public void supportsNoMatch() throws Exception {
        assertThat(new match<String,String>() {
            String value(Integer s) { return "Integer"; }
        }.apply("A String").getOrElse("No match found"), is("No match found"));
    }
}