Example usage for com.google.common.base Preconditions checkArgument

Introduction

In this page you can find the example usage for com.google.common.base Preconditions checkArgument.

Prototype

public static void checkArgument(boolean expression, @Nullable Object errorMessage) 

Source Link

Document

Ensures the truth of an expression involving one or more parameters to the calling method.

Usage

From source file:org.apache.flume.tools.TimestampRoundDownUtil.java

/**
 *
 * @param timestamp - The time stamp to be rounded down.
 * @param roundDownSec - The <tt>timestamp</tt> is rounded down to the largest
 * multiple of <tt>roundDownSec</tt> seconds
 * less than or equal to <tt>timestamp.</tt> Should be between 0 and 60.
 * @return - Rounded down timestamp//from w  w w .  j a  v a 2s. co m
 * @throws IllegalStateException
 */
public static long roundDownTimeStampSeconds(long timestamp, int roundDownSec) throws IllegalStateException {
    Preconditions.checkArgument(roundDownSec > 0 && roundDownSec <= 60, "RoundDownSec must be > 0 and <=60");
    Calendar cal = roundDownField(timestamp, Calendar.SECOND, roundDownSec);
    cal.set(Calendar.MILLISECOND, 0);
    return cal.getTimeInMillis();
}

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From source file:com.github.jeluard.guayaba.util.ServiceLoaders.java

/**
 * @param <T>/*w w w . ja va 2  s .c om*/
 * @param type
 * @param classLoader
 * @return first implementation of `type` as reported by {@link ServiceLoader#load(java.lang.Class, java.lang.ClassLoader)}, if any
 */
public static <T> T load(final Class<T> type, final ClassLoader classLoader) {
    Preconditions.checkNotNull(type, "null type");
    Preconditions.checkNotNull(classLoader, "null classLoader");

    final Iterator<T> iterator = ServiceLoader.load(type, classLoader).iterator();

    Preconditions.checkArgument(iterator.hasNext(), "empty result");

    return iterator.next();
}

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From source file:org.apache.james.transport.mailets.remote.delivery.Repeat.java

public static <T> List<T> repeat(T element, int times) {
    Preconditions.checkArgument(times >= 0, "Times argument should be strictly positive");
    return ImmutableList.copyOf(Iterables.limit(Iterables.cycle(element), times));
}

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From source file:com.metamx.common.parsers.TimestampParser.java

public static Function<String, DateTime> createTimestampParser(final String format) {
    if (format.equalsIgnoreCase("auto")) {
        // Could be iso or millis
        return new Function<String, DateTime>() {
            @Override// w  w  w.  ja  v a2 s. c  o  m
            public DateTime apply(String input) {
                Preconditions.checkArgument(input != null && !input.isEmpty(), "null timestamp");

                for (int i = 0; i < input.length(); i++) {
                    if (input.charAt(i) < '0' || input.charAt(i) > '9') {
                        return new DateTime(ParserUtils.stripQuotes(input));
                    }
                }

                return new DateTime(Long.parseLong(input));
            }
        };
    } else if (format.equalsIgnoreCase("iso")) {
        return new Function<String, DateTime>() {
            @Override
            public DateTime apply(String input) {
                Preconditions.checkArgument(input != null && !input.isEmpty(), "null timestamp");
                return new DateTime(ParserUtils.stripQuotes(input));
            }
        };
    } else if (format.equalsIgnoreCase("posix")) {
        return new Function<String, DateTime>() {
            @Override
            public DateTime apply(String input) {
                Preconditions.checkArgument(input != null && !input.isEmpty(), "null timestamp");
                return new DateTime(Long.parseLong(ParserUtils.stripQuotes(input)) * 1000);
            }
        };
    } else if (format.equalsIgnoreCase("ruby")) {
        return new Function<String, DateTime>() {
            @Override
            public DateTime apply(String input) {
                Preconditions.checkArgument(input != null && !input.isEmpty(), "null timestamp");
                Double ts = Double.parseDouble(ParserUtils.stripQuotes(input));
                Long jts = ts.longValue() * 1000; // ignoring milli secs
                return new DateTime(jts);
            }
        };
    } else if (format.equalsIgnoreCase("millis")) {
        return new Function<String, DateTime>() {
            @Override
            public DateTime apply(String input) {
                Preconditions.checkArgument(input != null && !input.isEmpty(), "null timestamp");
                return new DateTime(Long.parseLong(ParserUtils.stripQuotes(input)));
            }
        };
    } else if (format.equalsIgnoreCase("nano")) {
        return new Function<String, DateTime>() {
            @Override
            public DateTime apply(String input) {
                Preconditions.checkArgument(input != null && !input.isEmpty(), "null timestamp");
                long timeNs = Long.parseLong(ParserUtils.stripQuotes(input));
                // Convert to milliseconds, effectively: ms = floor(time in ns / 1000000)
                return new DateTime(timeNs / 1000000L);
            }
        };
    } else {
        try {
            final DateTimeFormatter formatter = DateTimeFormat.forPattern(format);
            return new Function<String, DateTime>() {
                @Override
                public DateTime apply(String input) {
                    Preconditions.checkArgument(input != null && !input.isEmpty(), "null timestamp");
                    return formatter.parseDateTime(ParserUtils.stripQuotes(input));
                }
            };
        } catch (Exception e) {
            throw new IAE(e, "Unable to parse timestamps with format [%s]", format);
        }
    }
}

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From source file:com.google.devtools.build.importdeps.ResolutionFailureChain.java

public static ResolutionFailureChain createWithParent(ClassInfo resolutionStartClass,
        ImmutableList<ResolutionFailureChain> parentChains) {
    Preconditions.checkArgument(!parentChains.isEmpty(), "The parentChains cannot be empty.");
    return new AutoValue_ResolutionFailureChain(
            parentChains.stream().flatMap(chain -> chain.missingClasses().stream()).sorted().distinct()
                    .collect(ImmutableList.toImmutableList()),
            resolutionStartClass, parentChains);
}

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From source file:pt.up.fe.specs.eclipse.builder.ExecTaskConfig.java

public static ExecTaskConfig parseArguments(List<String> arguments) {
    String workingDir = null;/*from  www .  j a v a 2  s.c  om*/

    while (!arguments.isEmpty() && arguments.get(0).startsWith("[")) {
        String option = arguments.remove(0);
        // Remove square brackets
        Preconditions.checkArgument(option.endsWith("]"), "Expected option to end with ]: " + option);

        String workOption = option.substring(1, option.length() - 1);

        int equalIndex = workOption.indexOf('=');
        Preconditions.checkArgument(equalIndex != -1, "Expected an equals: " + option);

        String key = workOption.substring(0, equalIndex);
        String value = workOption.substring(equalIndex + 1, workOption.length());
        switch (key.toLowerCase()) {
        case "dir":
            workingDir = value;
            break;
        default:
            throw new RuntimeException(
                    "Property '" + key + "' not supported, supported properties: " + SUPPORTED_PROPERTIES);
        }
    }

    return new ExecTaskConfig(workingDir);
}

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From source file:co.cask.cdap.internal.app.workflow.WorkflowNodeCreator.java

static WorkflowNode createWorkflowActionNode(String programName, SchedulableProgramType programType) {
    switch (programType) {
    case MAPREDUCE:
        Preconditions.checkNotNull(programName, "MapReduce name is null.");
        Preconditions.checkArgument(!programName.isEmpty(), "MapReduce name is empty.");
        break;//from  w  ww . j  a  v a2s  .c  o  m
    case SPARK:
        Preconditions.checkNotNull(programName, "Spark name is null.");
        Preconditions.checkArgument(!programName.isEmpty(), "Spark name is empty.");
        break;
    case CUSTOM_ACTION:
        //no-op
        break;
    default:
        break;
    }

    return new WorkflowActionNode(programName, new ScheduleProgramInfo(programType, programName));
}

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From source file:org.thelq.stackexchange.api.queries.QueryUtils.java

public static void putIfNotNull(LinkedHashMap<String, String> finalParameters, String key, Object value) {
    if (value == null)
        return;//from   w  ww.  j a  v  a  2  s .  c  o  m
    String valueString = String.valueOf(value);
    Preconditions.checkArgument(StringUtils.isNotBlank(valueString), "Value cannot be blank");
    finalParameters.put(key, valueString);
}

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From source file:io.druid.indexing.worker.TaskAnnouncement.java

public static TaskAnnouncement create(String taskId, TaskResource resource, TaskStatus status) {
    Preconditions.checkArgument(status.getId().equals(taskId), "task id == status id");
    return new TaskAnnouncement(null, null, status, resource);
}

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From source file:eu.stratosphere.sopremo.operator.PactBuilderUtil.java

public static void addKeys(ReduceContract.Builder builder, Class<? extends Key>[] keyClasses,
        int[] keyIndices) {
    Preconditions.checkArgument(keyClasses.length == keyIndices.length,
            "Lenght of keyClasses and keyIndices must match.");
    for (int i = 0; i < keyClasses.length; ++i) {
        builder.keyField(keyClasses[i], keyIndices[i]);
    }//from  w w w .j  ava  2s  .co m
}

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