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:com.talvish.tales.parts.RegularExpressionHelper.java

/**
 * Helper method that makes sure a user supplied regular expression
 * doesn't contain capturing groups, which would otherwise cause problems
 * if the regex is being used for needs where other capturing groups are
 * important//from w  w  w.  ja v a2  s . c  om
 * @param theRegEx the regex to escape
 * @return the non-capturing regex
 */
public final static String toNoncapturingExpression(String theRegEx) {
    Preconditions.checkArgument(!Strings.isNullOrEmpty(theRegEx), "need a regex");
    // I feel there is a better way, but this is good enough for now ...
    StringBuilder builder = new StringBuilder();

    int charClassCount = 0;

    int startOffset = 0;
    char currentChar;

    for (int offset = 0; offset < theRegEx.length(); offset += 1) {
        currentChar = theRegEx.charAt(offset);
        if (currentChar == '\\') { // ignore escaping character
            offset += 1;
        } else if (currentChar == '[') { // we are in a capturing group (java supports some nesting, though I don't fully here)
            charClassCount += 1;
        } else if (currentChar == ']') { // we are leaving one
            charClassCount -= 1;
        } else if (currentChar == '(' && charClassCount == 0) {
            if ((offset == theRegEx.length() - 1) || (theRegEx.charAt(offset + 1) != '?')) { // found at the end or next character isn't a quote/meaning non-capturing already
                builder.append(theRegEx.substring(startOffset, offset + 1));
                builder.append("?:"); // turn into a non capturing group
                startOffset = offset + 1;
            }
        }
    }
    builder.append(theRegEx.substring(startOffset, theRegEx.length()));
    return builder.toString();
}

From source file:com.jivesoftware.os.server.http.jetty.jersey.server.binding.Injectable.java

@SuppressWarnings("unchecked")
public static <T2> Injectable<T2> ofUnsafe(Class<T2> injectableType, Object instance) {
    Preconditions.checkNotNull(injectableType);
    Preconditions.checkNotNull(instance);
    Preconditions.checkArgument(injectableType.isAssignableFrom(instance.getClass()),
            "Injectable must be assignable to type '" + injectableType + "': " + instance);
    return new Injectable<>(injectableType, (T2) instance);
}

From source file:org.apache.mahout.df.data.DataUtils.java

/**
 * foreach i : array1[i] += array2[i]//  ww  w . j av a 2s  . co  m
 */
public static void add(int[] array1, int[] array2) {
    Preconditions.checkArgument(array1.length == array2.length, "array1.length != array2.length");
    for (int index = 0; index < array1.length; index++) {
        array1[index] += array2[index];
    }
}

From source file:com.metamx.druid.indexing.worker.TaskAnnouncement.java

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

From source file:com.google.cloud.bigtable.grpc.ResultQueueEntry.java

public static <T> ResultQueueEntry<T> newThrowable(Throwable throwable) {
    Preconditions.checkArgument(throwable != null, "Throwable may not be null");
    return new ResultQueueEntry<>(throwable, null, false);
}

From source file:org.apache.gobblin.source.extractor.extract.kafka.KafkaUtils.java

/**
 * Get topic name from a {@link State} object. The {@link State} should contain property
 * {@link KafkaSource#TOPIC_NAME}.// w  ww .  j av  a2  s.c  o  m
 */
public static String getTopicName(State state) {
    Preconditions.checkArgument(state.contains(KafkaSource.TOPIC_NAME),
            "Missing configuration property " + KafkaSource.TOPIC_NAME);

    return state.getProp(KafkaSource.TOPIC_NAME);
}

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

@SuppressWarnings("unchecked")
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));
}

From source file:com.qcadoo.mes.materialFlowResources.constants.DocumentState.java

public static DocumentState of(final Entity entity) {
    Preconditions.checkArgument(entity != null, "Passed entity have to be non null");
    return parseString(entity.getStringField(DocumentFields.STATE));
}

From source file:com.facebook.presto.sql.planner.Symbol.java

public static Symbol fromQualifiedName(QualifiedName name) {
    Preconditions.checkArgument(!name.getPrefix().isPresent(),
            "Can't create a symbol from a qualified name with prefix");
    return new Symbol(name.getSuffix());
}

From source file:com.salesforce.jprotoc.ProtoTypeMap.java

/**
 * Returns an instance of {@link ProtoTypeMap} based on the given {@link DescriptorProtos.FileDescriptorProto}
 * instances.//  w  w w . ja v a2  s.  c om
 *
 * @param fileDescriptorProtos the full collection of files descriptors from the code generator request
 */
public static ProtoTypeMap of(@Nonnull Collection<DescriptorProtos.FileDescriptorProto> fileDescriptorProtos) {
    Preconditions.checkNotNull(fileDescriptorProtos, "fileDescriptorProtos");
    Preconditions.checkArgument(!fileDescriptorProtos.isEmpty(), "fileDescriptorProtos.isEmpty()");

    final ImmutableMap.Builder<String, String> types = ImmutableMap.builder();

    for (final DescriptorProtos.FileDescriptorProto fileDescriptor : fileDescriptorProtos) {
        final DescriptorProtos.FileOptions fileOptions = fileDescriptor.getOptions();

        final String protoPackage = fileDescriptor.hasPackage() ? "." + fileDescriptor.getPackage() : "";
        final String javaPackage = Strings.emptyToNull(
                fileOptions.hasJavaPackage() ? fileOptions.getJavaPackage() : fileDescriptor.getPackage());
        final String enclosingClassName = fileOptions.getJavaMultipleFiles() ? null
                : getJavaOuterClassname(fileDescriptor, fileOptions);

        fileDescriptor.getEnumTypeList().forEach(e -> types.put(protoPackage + "." + e.getName(),
                toJavaTypeName(e.getName(), enclosingClassName, javaPackage)));

        fileDescriptor.getMessageTypeList().forEach(m -> types.put(protoPackage + "." + m.getName(),
                toJavaTypeName(m.getName(), enclosingClassName, javaPackage)));
    }

    return new ProtoTypeMap(types.build());
}