Example usage for java.util Comparator comparing

Introduction

In this page you can find the example usage for java.util Comparator comparing.

Prototype

public static <T, U extends Comparable<? super U>> Comparator<T> comparing(
        Function<? super T, ? extends U> keyExtractor)

Source Link

Document

Accepts a function that extracts a java.lang.Comparable Comparable sort key from a type T , and returns a Comparator that compares by that sort key.

Usage

From source file:project.combiner.P2ProfileGenerator.java

private static List<String> readLastProfile(Path root) throws IOException {
    Path registryFolder = root.resolve("p2/org.eclipse.equinox.p2.engine/profileRegistry");
    IOStream<Path> sorted = Files.walk(registryFolder).filter(p -> p.getFileName().toString().endsWith(".gz"))
            .sorted(Comparator.comparing(Path::getFileName).reversed());
    Path path = sorted.findFirst().get();
    System.out.println("Reading " + path);
    byte[] bs = Streams.readFully(new GZIPInputStream(Files.newInputStream(path)));
    String string = new String(bs, StandardCharsets.UTF_8).replace("\r", "");
    return List.of(string.split("\n"));
}

From source file:org.openecomp.sdc.be.components.impl.ArtifactsBusinessLogic.java

/**
 * //from  w  ww .  j av  a  2s . co m
 * @param artifactDefinition
 * @return
 */
public Either<ArtifactDefinition, ResponseFormat> generateHeatEnvArtifact(ArtifactDefinition artifactDefinition,
        org.openecomp.sdc.be.model.Component component, String resourceInstanceName, User modifier,
        boolean shouldLock) {
    List<HeatParameterDefinition> heatParameters = artifactDefinition.getHeatParameters();
    heatParameters.sort(Comparator.comparing(e -> e.getName()));
    StringBuilder sb = new StringBuilder("parameters:\n");
    if (heatParameters != null) {

        for (HeatParameterDefinition heatParameterDefinition : heatParameters) {
            if (heatParameterDefinition.getCurrentValue() != null) {
                HeatParameterType type = HeatParameterType.isValidType(heatParameterDefinition.getType());
                if (type != null) {
                    switch (type) {
                    case BOOLEAN:
                        sb.append("  ").append(heatParameterDefinition.getName()).append(":").append(" ")
                                .append(Boolean.parseBoolean(heatParameterDefinition.getCurrentValue()))
                                .append("\n");
                        break;
                    case NUMBER:
                        // if
                        // (ValidationUtils.isFloatNumber(heatParameterDefinition.getCurrentValue()))
                        // {
                        // sb.append("
                        // ").append(heatParameterDefinition.getName()).append(":").append("
                        // ").append(Float.parseFloat(heatParameterDefinition.getCurrentValue())).append("\n");
                        // } else {
                        // sb.append("
                        // ").append(heatParameterDefinition.getName()).append(":").append("
                        // ").append(Integer.parseInt(heatParameterDefinition.getCurrentValue())).append("\n");
                        // }
                        sb.append("  ").append(heatParameterDefinition.getName()).append(":").append(" ")
                                .append(new BigDecimal(heatParameterDefinition.getCurrentValue())
                                        .toPlainString())
                                .append("\n");
                        break;
                    case COMMA_DELIMITED_LIST:
                    case JSON:
                        sb.append("  ").append(heatParameterDefinition.getName()).append(":").append(" ")
                                .append(heatParameterDefinition.getCurrentValue()).append("\n");
                        break;
                    default:
                        String value = heatParameterDefinition.getCurrentValue();
                        boolean starts = value.startsWith("\"");
                        boolean ends = value.endsWith("\"");
                        if (!(starts && ends)) {
                            starts = value.startsWith("'");
                            ends = value.endsWith("'");
                            if (!(starts && ends)) {
                                value = "\"" + value + "\"";
                            }
                        }
                        sb.append("  ").append(heatParameterDefinition.getName()).append(":").append(" ")
                                .append(value);
                        sb.append("\n");
                        break;

                    }
                }
            }
        }
    }
    return generateAndSaveHeatEnvArtifact(artifactDefinition, sb.toString(), component, resourceInstanceName,
            modifier, shouldLock);

}