Example usage for java.util.function Function Function

Introduction

In this page you can find the example usage for java.util.function Function Function.

Prototype

Function

Source Link

Usage

From source file:com.thoughtworks.go.domain.AllConfigErrors.java

public String asString() {
    return StringUtils.join(this.stream().map(new Function<ConfigErrors, String>() {
        @Override//from   w  ww  . j  a va  2 s  . com
        public String apply(ConfigErrors errors) {
            return errors.asString();
        }
    }).collect(Collectors.toList()), ", ");
}

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From source file:io.yields.math.framework.kpi.Accuracy.java

@Override
protected double quality(PropertyVerifications<Double> propertyVerifications) {
    if (propertyVerifications.allValid()) {
        return 1d;
    } else {/*from ww  w .java 2  s  . com*/
        return propertyVerifications.getFunctionOutcome().map(new Function<Double, Double>() {
            @Override
            public Double apply(Double value) {
                double negativeFunctionOutcome = value * -1;
                return NORMAL_DISTRIBUTION.cumulativeProbability(negativeFunctionOutcome / accuracy) / .5;
            }
        }).orElse(0d);
    }
}

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From source file:com.opengamma.strata.math.impl.statistics.leastsquare.NonLinearLeastSquareWithPenaltyTest.java

public void linearTest() {
    boolean print = false;
    if (print) {//from   w w  w . j  a  v a2 s .co  m
        System.out.println("NonLinearLeastSquareWithPenaltyTest.linearTest");
    }
    int nWeights = 20;
    int diffOrder = 2;
    double lambda = 100.0;
    DoubleMatrix penalty = (DoubleMatrix) MA.scale(getPenaltyMatrix(nWeights, diffOrder), lambda);
    int[] onIndex = new int[] { 1, 4, 11, 12, 15, 17 };
    double[] obs = new double[] { 0, 1.0, 1.0, 1.0, 0.0, 0.0 };
    int n = onIndex.length;

    Function<DoubleArray, DoubleArray> func = new Function<DoubleArray, DoubleArray>() {

        @Override
        public DoubleArray apply(DoubleArray x) {
            return DoubleArray.of(n, i -> x.get(onIndex[i]));
        }
    };

    Function<DoubleArray, DoubleMatrix> jac = new Function<DoubleArray, DoubleMatrix>() {

        @Override
        public DoubleMatrix apply(DoubleArray x) {
            return DoubleMatrix.of(n, nWeights, (i, j) -> j == onIndex[i] ? 1d : 0d);
        }
    };

    Well44497b random = new Well44497b(0L);
    DoubleArray start = DoubleArray.of(nWeights, i -> random.nextDouble());

    LeastSquareWithPenaltyResults lsRes = NLLSWP.solve(DoubleArray.copyOf(obs), DoubleArray.filled(n, 0.01),
            func, jac, start, penalty);
    if (print) {
        System.out.println("chi2: " + lsRes.getChiSq());
        System.out.println(lsRes.getFitParameters());
    }
    for (int i = 0; i < n; i++) {
        assertEquals(obs[i], lsRes.getFitParameters().get(onIndex[i]), 0.01);
    }
    double expPen = 20.87912357454752;
    assertEquals(expPen, lsRes.getPenalty(), 1e-9);
}

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From source file:objenome.NumericAnalysisTest.java

@Test
public void testFindZeros() throws IncompleteSolutionException {

    Objenome o = Objenome.solve(new FindZeros(ExampleScalarFunction.class,

            new Function<ExampleScalarFunction, Double>() {
                @Override/*from   w  w w. j  av a  2s  .c om*/
                public Double apply(ExampleScalarFunction s) {
                    return s.output(0.0) + s.output(0.5) + s.output(1.0);
                }

            }), ExampleScalarFunction.class);

    double bestParam = ((Number) o.getSolutions().get(0)).doubleValue();
    assertEquals(-3.97454, bestParam, 0.001);
}

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From source file:com.tobedevoured.json.SimpleStreamTest.java

@Test
public void testStreamFromUrl() throws StreamException {
    stubFor(get(urlEqualTo("/test")).willReturn(aResponse().withStatus(200)
            .withHeader("Content-Type", "text/json").withBody("{ \"test\": \n  true }")));

    final Map results = new HashMap();
    simpleStream.setCallback(new Function<Object, Object>() {

        @Override/* w  w w.ja v a 2s  .c  o m*/
        public Object apply(Object entity) {
            assertNotNull(entity);

            results.putAll((Map) entity);

            return null;
        }
    });

    simpleStream.streamFromUrl("http://localhost:8089/test", 30);
    simpleStream.flush();

    Map<String, Boolean> test = ImmutableMap.of("test", true);
    assertEquals(results, test);
}

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From source file:com.heliosapm.streams.collector.ds.pool.PooledObjectFactoryBuilder.java

/**
 * Provides the validating function that will validate pooled objects
 * @return the validating function//from  w  ww . j a  va  2 s.  c  o m
 */
default public Function<PooledObject<T>, Boolean> validator() {
    return new Function<PooledObject<T>, Boolean>() {
        @Override
        public Boolean apply(final PooledObject<T> t) {
            return validateObject(t);
        }
    };
}

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From source file:org.zalando.riptide.OAuth2CompatibilityResponseErrorHandlerTest.java

private Matcher<ClientHttpResponse> statusCode(final HttpStatus status) {
    return hasFeature("statusCode", new Function<ClientHttpResponse, HttpStatus>() {
        @Override/*w ww  . ja v  a 2 s.com*/
        public HttpStatus apply(final ClientHttpResponse response) {
            try {
                return response.getStatusCode();
            } catch (final Exception e) {
                throw new RuntimeException(e);
            }
        }
    }, is(status));
}

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From source file:com.heliosapm.streams.collector.ds.pool.PooledObjectFactoryBuilder.java

/**
 * Provides the validating function that will validate pooled objects
 * @return the validating function// w w  w. j av a  2  s.co m
 */
default public Function<PooledObject<T>, Void> closer() {
    return new Function<PooledObject<T>, Void>() {
        @Override
        public Void apply(final PooledObject<T> p) {
            try {
                destroyObject(p);
            } catch (Exception x) {
                /* No Op */}
            return null;
        }
    };
}

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From source file:com.opengamma.strata.math.impl.minimization.SumToOneTest.java

@Test
public void solverTest() {
    double[] w = new double[] { 0.01, 0.5, 0.3, 0.19 };
    final int n = w.length;
    final SumToOne trans = new SumToOne(n);
    Function<DoubleArray, DoubleArray> func = new Function<DoubleArray, DoubleArray>() {

        @Override/*from  w ww .  j  a  va 2  s .  co  m*/
        public DoubleArray apply(DoubleArray theta) {
            return trans.transform(theta);
        }
    };

    DoubleArray sigma = DoubleArray.filled(n, 1e-4);
    DoubleArray start = DoubleArray.filled(n - 1, 0.8);

    LeastSquareResults res = SOLVER.solve(DoubleArray.copyOf(w), sigma, func, start/*, maxJump*/);
    assertEquals("chi sqr", 0.0, res.getChiSq(), 1e-9);
    double[] fit = res.getFitParameters().toArray();
    double[] expected = trans.inverseTransform(w);
    for (int i = 0; i < n - 1; i++) {
        //put the fit result back in the range 0 - pi/2
        double x = fit[i];
        if (x < 0) {
            x = -x;
        }
        if (x > Math.PI / 2) {
            int p = (int) (x / Math.PI);
            x -= p * Math.PI;
            if (x > Math.PI / 2) {
                x = -x + Math.PI;
            }
        }

        assertEquals(expected[i], x, 1e-9);
    }

}

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From source file:io.github.jianzhichun.springboot.starters.swagger2.config.AutoSwagger2Configuration.java

@Bean
@ConditionalOnMissingBean(Docket.class)
public Docket docket() {
    ApiInfo apiInfo = new ApiInfoBuilder().title(autoSwagger2Properties.getApiInfo().getTitle())
            .description(autoSwagger2Properties.getApiInfo().getDescription())
            .termsOfServiceUrl(autoSwagger2Properties.getApiInfo().getTermsOfServiceUrl())
            .contact(new Contact(autoSwagger2Properties.getApiInfo().getContact().getName(),
                    autoSwagger2Properties.getApiInfo().getContact().getUrl(),
                    autoSwagger2Properties.getApiInfo().getContact().getEmail()))
            .version(autoSwagger2Properties.getApiInfo().getVersion())
            .license(autoSwagger2Properties.getApiInfo().getLicense())
            .licenseUrl(autoSwagger2Properties.getApiInfo().getLicenseUrl()).build();
    return new Docket(DocumentationType.SWAGGER_2).host(autoSwagger2Properties.getHost())
            .protocols(newHashSet(autoSwagger2Properties.getProtocols()))
            .enable(autoSwagger2Properties.isEnable()).apiInfo(apiInfo).select()
            .apis(not(withMethodAnnotation(IgnoreMethod.class)))
            .apis(RequestHandlerSelectors.basePackage(autoSwagger2Properties.getBasePackage()))
            .paths(CollectionUtils.isEmpty(autoSwagger2Properties.getPaths().getOr()) ? PathSelectors.any()
                    : or(map2list(autoSwagger2Properties.getPaths().getOr(),
                            new Function<String, Predicate<String>>() {
                                @Override
                                public Predicate<String> apply(String path) {
                                    return regex(path);
                                }/*from   w w  w. j  a  va 2s.  co m*/
                            })))
            .paths(CollectionUtils.isEmpty(autoSwagger2Properties.getPaths().getNot()) ? PathSelectors.any()
                    : and(map2list(autoSwagger2Properties.getPaths().getNot(),
                            new Function<String, Predicate<String>>() {
                                @Override
                                public Predicate<String> apply(String path) {
                                    return not(regex(path));
                                }
                            })))
            .build();

}

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