Example usage for java.lang NullPointerException NullPointerException

Introduction

In this page you can find the example usage for java.lang NullPointerException NullPointerException.

Prototype

public NullPointerException(String s)

Source Link

Document

Constructs a NullPointerException with the specified detail message.

Usage

From source file:Main.java

/**
 * Join the {@code strings} into one string with {@code delimiter} in 
 * between. It is similar to RegExpObject.test(string) in JavaScript.
 * //from  w  w  w . j  a  v  a2s .  c  om
 * @param strings the string list to join
 * @param delimiter the delimiter
 * 
 * @return the joined string
 */
public static String join(String[] strings, String delimiter) {
    if (strings == null) {
        throw new NullPointerException("argument 'strings' cannot be null");
    }

    StringBuilder sb = new StringBuilder();

    if (strings.length != 0) {
        sb.append(strings[0]);
        for (int i = 1, iEnd = strings.length; i < iEnd; i++) {
            if (delimiter != null) {
                sb.append(delimiter);
            }
            sb.append(strings[i]);
        }
    }

    return sb.toString();
}

From source file:fi.smaa.libror.RandomUtil.java

/**
 * Creates an array of random numbers that sum to a given amount.
 * //w  w  w .  j a v a2 s.co  m
 * @param dest the array to create the numbers to.
 * @param sumTo The amount the numbers must sum to. Must be >= 0.0
 * @throws NullPointerException if dest == null
 */
public static void createSumToRand(double[] dest, double sumTo) throws NullPointerException {
    if (sumTo < 0.0) {
        throw new IllegalArgumentException("sumTo negative");
    }
    if (dest == null) {
        throw new NullPointerException("destination array null");
    }

    int len = dest.length;
    for (int i = 0; i < len - 1; i++) {
        dest[i] = createUnif01() * sumTo;
    }

    dest[len - 1] = sumTo;

    Arrays.sort(dest);

    double last = 0.0;
    for (int i = 0; i < len; i++) {
        double t = dest[i];
        dest[i] = t - last;
        last = t;
    }
}

From source file:com.amazonaws.services.dynamodbv2.xspec.NamedElement.java

NamedElement(String name) {
    if (name == null) {
        throw new NullPointerException("element");
    }/*from  ww w.  j a  v  a 2s  . c om*/
    if (name.trim().isEmpty()) {
        throw new IllegalArgumentException("element cannot be empty");
    }
    this.name = name;
}

From source file:edu.cornell.mannlib.vitro.webapp.auth.permissions.PermissionRegistry.java

/**
 * Create the registry and store it in the context.
 *//*from w  w  w. j  av a2  s.c  o m*/
public static void createRegistry(ServletContext ctx, Collection<? extends Permission> permissions) {
    if (ctx == null) {
        throw new NullPointerException("ctx may not be null.");
    }
    if (permissions == null) {
        throw new NullPointerException("permissions may not be null.");
    }
    if (ctx.getAttribute(ATTRIBUTE_NAME) != null) {
        throw new IllegalStateException("PermissionRegistry has already been set.");
    }

    PermissionRegistry registry = new PermissionRegistry();
    registry.addPermissions(permissions);
    ctx.setAttribute(ATTRIBUTE_NAME, registry);
}

From source file:com.nestedbird.util.UUIDConverter.java

/**
 * Turns a UUID in string format to a Base64 encoded version
 *
 * @param uuidString String representation of the uuid
 * @return base64 encoded version of the uuid
 * @throws IllegalArgumentException String must be a valid uuid
 * @throws NullPointerException     String cannot be null
 *//*  www.j a va 2 s .  com*/
public static String toBase64(final String uuidString) {
    if (uuidString == null)
        throw new NullPointerException("String cannot be null");
    if (!isUUID(uuidString))
        throw new IllegalArgumentException("string must be a valid uuid");

    final UUID uuid = UUID.fromString(uuidString);
    final ByteBuffer bb = ByteBuffer.wrap(new byte[16]);
    bb.putLong(uuid.getMostSignificantBits());
    bb.putLong(uuid.getLeastSignificantBits());
    return Base64.encodeBase64URLSafeString(bb.array());
}

From source file:com.cloudhopper.sxmp.SxmpWriter.java

static private void writeOperationStartTag(Writer out, Operation.Type type) throws IOException {
    if (type == null) {
        throw new NullPointerException("Operation type cannot be null");
    }/*from  w  ww .j  a  v  a  2s . co  m*/

    out.write("<operation type=\"" + type.getValue() + "\">\n");
}

From source file:com.jfinal.ext.plugin.sqlinxml.SqlKit.java

public static String sql(String groupNameAndsqlId) {
    if (sqlMap == null) {
        throw new NullPointerException("SqlInXmlPlugin not start");
    }/*from  w  w w .ja  v  a  2 s  . c o  m*/
    return ((SqlValueItem) sqlMap.get(groupNameAndsqlId)).value;
}

From source file:com.symbian.utils.config.CheckGetConfig.java

/**
 * @param aKey/*from   w w w .  j a v a2s .c om*/
 * @param aValue
 * @return
 * @throws ParseException 
 */
public Object get(final String aKey, final Object aValue) throws ParseException {
    if (aValue == null) {
        throw new NullPointerException("Generic getter: " + aKey + " is null.");
    }

    return aValue;
}

From source file:com.symbian.utils.config.CheckSetConfig.java

/**
 * @param aKey/* w ww  .jav  a 2 s. c  om*/
 * @param aValue
 * @return
 * @throws ParseException 
 */
public Object set(final String aKey, final Object aValue) throws ParseException {
    if (aValue == null) {
        throw new NullPointerException("Generic setter: " + aKey + " is null.");
    }

    return aValue;
}

From source file:com.espertech.esper.epl.view.OutputConditionPolledFactory.java

/**
 * Creates an output condition instance.
 * @param outputLimitSpec specifies what kind of condition to create
 * @return instance for handling output condition
 *//*from  w w w  .j a va2s . c  o m*/
public static OutputConditionPolled createCondition(OutputLimitSpec outputLimitSpec,
        AgentInstanceContext agentInstanceContext) throws ExprValidationException {
    if (outputLimitSpec == null) {
        throw new NullPointerException("Output condition by count requires a non-null callback");
    }

    // Check if a variable is present
    VariableReader reader = null;
    if (outputLimitSpec.getVariableName() != null) {
        reader = agentInstanceContext.getStatementContext().getVariableService()
                .getReader(outputLimitSpec.getVariableName());
        if (reader == null) {
            throw new IllegalArgumentException(
                    "Variable named '" + outputLimitSpec.getVariableName() + "' has not been declared");
        }
    }

    if (outputLimitSpec.getRateType() == OutputLimitRateType.CRONTAB) {
        return new OutputConditionPolledCrontab(outputLimitSpec.getCrontabAtSchedule(), agentInstanceContext);
    } else if (outputLimitSpec.getRateType() == OutputLimitRateType.WHEN_EXPRESSION) {
        return new OutputConditionPolledExpression(outputLimitSpec.getWhenExpressionNode(),
                outputLimitSpec.getThenExpressions(), agentInstanceContext);
    } else if (outputLimitSpec.getRateType() == OutputLimitRateType.EVENTS) {
        if (log.isDebugEnabled()) {
            log.debug(".createCondition creating OutputConditionCount with event rate " + outputLimitSpec);
        }

        if ((reader != null) && (!JavaClassHelper.isNumericNonFP(reader.getType()))) {
            throw new IllegalArgumentException("Variable named '" + outputLimitSpec.getVariableName()
                    + "' must be type integer, long or short");
        }

        int rate = -1;
        if (outputLimitSpec.getRate() != null) {
            rate = outputLimitSpec.getRate().intValue();
        }
        return new OutputConditionPolledCount(rate, reader);
    } else {
        if ((reader != null) && (!JavaClassHelper.isNumeric(reader.getType()))) {
            throw new IllegalArgumentException(
                    "Variable named '" + outputLimitSpec.getVariableName() + "' must be of numeric type");
        }

        return new OutputConditionPolledTime(outputLimitSpec.getTimePeriodExpr(), agentInstanceContext);
    }
}