Example usage for java.util Map isEmpty

Introduction

In this page you can find the example usage for java.util Map isEmpty.

Prototype

boolean isEmpty();

Source Link

Document

Returns true if this map contains no key-value mappings.

Usage

From source file:Main.java

/**
 * Checks if the given map is empty.//from w w w  .j ava2 s.com
 *
 * @param map
 *          map to check
 * @return <code>true</code> if the given reference is <code>null</code> or map is empty
 */
public static boolean isEmpty(final Map<?, ?> map) {
    return map == null || map.isEmpty();
}

---

From source file:com.datumbox.framework.common.dataobjects.MatrixDataframe.java

/**
 * Parses a single Record and converts it to RealVector by using an already
 * existing mapping between feature names and column ids. 
 * /*from  w  w  w  .j a v a2s .com*/
 * @param r
 * @param featureIdsReference
 * @return 
 */
public static RealVector parseRecord(Record r, Map<Object, Integer> featureIdsReference) {
    if (featureIdsReference.isEmpty()) {
        throw new IllegalArgumentException("The featureIdsReference map should not be empty.");
    }

    int d = featureIdsReference.size();

    RealVector v = new ArrayRealVector(d);

    boolean addConstantColumn = featureIdsReference.containsKey(Dataframe.COLUMN_NAME_CONSTANT);

    if (addConstantColumn) {
        v.setEntry(0, 1.0); //add the constant column
    }
    for (Map.Entry<Object, Object> entry : r.getX().entrySet()) {
        Object feature = entry.getKey();
        Double value = TypeInference.toDouble(entry.getValue());
        if (value != null) {
            Integer featureId = featureIdsReference.get(feature);
            if (featureId != null) {//if the feature exists in our database
                v.setEntry(featureId, value);
            }
        } else {
            //else the X matrix maintains the 0.0 default value
        }
    }

    return v;
}

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From source file:edu.isi.misd.scanner.network.registry.web.controller.BaseController.java

public static Map<String, String> validateParameterMap(Map<String, String> paramMap, String... paramNames)
        throws BadRequestException {
    HashMap<String, String> validParams = new HashMap<String, String>();
    if (!paramMap.isEmpty()) {
        String paramValue;/*from w w w  .j a  v a  2s  .  c  om*/
        for (String paramName : paramNames) {
            paramValue = paramMap.remove(paramName);
            if (paramValue != null) {
                validParams.put(paramName, paramValue);
            }
        }

        if (!paramMap.isEmpty()) {
            throw new BadRequestException(paramMap.keySet());
        }
    }
    return validParams;
}

---

From source file:com.datumbox.framework.common.dataobjects.MatrixDataframe.java

/**
 * Parses a testing dataset and converts it to MatrixDataframe by using an already
existing mapping between feature names and column ids. Typically used
 * to parse the testing or validation dataset.
 * /*from  w  ww .  j a va2 s.com*/
 * @param newData
 * @param recordIdsReference
 * @param featureIdsReference
 * @return 
 */
public static MatrixDataframe parseDataset(Dataframe newData, Map<Integer, Integer> recordIdsReference,
        Map<Object, Integer> featureIdsReference) {
    if (featureIdsReference.isEmpty()) {
        throw new IllegalArgumentException("The featureIdsReference map should not be empty.");
    }

    int n = newData.size();
    int d = featureIdsReference.size();

    MatrixDataframe m = new MatrixDataframe(new OpenMapRealMatrix(n, d), new ArrayRealVector(n));

    if (newData.isEmpty()) {
        return m;
    }

    boolean extractY = (newData.getYDataType() == TypeInference.DataType.NUMERICAL);

    boolean addConstantColumn = featureIdsReference.containsKey(Dataframe.COLUMN_NAME_CONSTANT);

    int rowId = 0;
    for (Map.Entry<Integer, Record> e : newData.entries()) {
        Integer rId = e.getKey();
        Record r = e.getValue();
        if (recordIdsReference != null) {
            recordIdsReference.put(rId, rowId);
        }

        if (extractY) {
            m.Y.setEntry(rowId, TypeInference.toDouble(r.getY()));
        }

        if (addConstantColumn) {
            m.X.setEntry(rowId, 0, 1.0); //add the constant column
        }
        for (Map.Entry<Object, Object> entry : r.getX().entrySet()) {
            Object feature = entry.getKey();
            Double value = TypeInference.toDouble(entry.getValue());
            if (value != null) {
                Integer featureId = featureIdsReference.get(feature);
                if (featureId != null) {//if the feature exists in our database
                    m.X.setEntry(rowId, featureId, value);
                }
            } //else the X matrix maintains the 0.0 default value
        }
        ++rowId;
    }

    return m;
}

---

From source file:de.hofuniversity.iisys.neo4j.websock.util.JsonConverter.java

/**
 * Converts a generic websocket query into JSON.
 * Detects maps and lists that are already in the proper wrapped format and
 * lets them pass through.//from  w w  w  .j  a v  a 2s  .c  o m
 * The query given must not be null.
 *
 * @param query query to convert
 * @return query converted to JSON
 */
@SuppressWarnings("unchecked")
public static JSONObject toJson(final WebsockQuery query) throws JSONException {
    final JSONObject json = new JSONObject();

    //basic attributes
    json.put(WebsockConstants.QUERY_ID, query.getId());
    json.put(WebsockConstants.QUERY_TYPE, query.getType().getCode());

    //parameters
    Map<String, Object> params = query.getParameters();
    if (params != null && !params.isEmpty()) {
        if (params instanceof JSONMap) {
            json.put(WebsockConstants.PARAMETERS, ((JSONMap) params).getJson());
        } else {
            json.put(WebsockConstants.PARAMETERS, convertFromMap(params));
        }
    }

    //payload
    Object payload = query.getPayload();
    if (payload != null) {
        if (payload instanceof Map) {
            if (payload instanceof JSONMap) {
                payload = ((JSONMap) payload).getJson();
            } else {
                payload = convertFromMap((Map<String, ?>) payload);
            }
        } else if (payload instanceof List) {
            if (payload instanceof JSONList) {
                payload = ((JSONList) payload).getJson();
            } else {
                payload = convertFromList((List<?>) payload);
            }
        }

        json.put(WebsockConstants.PAYLOAD, payload);
    }

    return json;
}

---

From source file:org.bndtools.rt.repository.marshall.CapReqJson.java

public static void writeCapability(Capability capability, JsonGenerator generator) throws IOException {
    generator.writeStartObject();/* w ww. j  a v  a  2 s .co m*/
    generator.writeStringField("ns", capability.getNamespace());

    Map<String, Object> attrs = capability.getAttributes();
    if (!attrs.isEmpty()) {
        generator.writeArrayFieldStart("attrs");
        for (Entry<String, Object> entry : attrs.entrySet()) {
            writeAttribute(entry.getKey(), entry.getValue(), generator);
        }
        generator.writeEndArray();
    }

    Map<String, String> dirs = capability.getDirectives();
    if (!dirs.isEmpty()) {
        generator.writeArrayFieldStart("dirs");
        for (Entry<String, String> entry : dirs.entrySet()) {
            writeDirective(entry.getKey(), entry.getValue(), generator);
        }
        generator.writeEndArray();
    }

    generator.writeEndObject();
}

---

From source file:org.bndtools.rt.repository.marshall.CapReqJson.java

public static void writeRequirement(Requirement requirement, JsonGenerator generator) throws IOException {
    generator.writeStartObject();// ww w .j a va 2s.c  o m
    generator.writeStringField("ns", requirement.getNamespace());

    Map<String, Object> attrs = requirement.getAttributes();
    if (!attrs.isEmpty()) {
        generator.writeArrayFieldStart("attrs");
        for (Entry<String, Object> entry : attrs.entrySet()) {
            writeAttribute(entry.getKey(), entry.getValue(), generator);
        }
        generator.writeEndArray();
    }

    Map<String, String> dirs = requirement.getDirectives();
    if (!dirs.isEmpty()) {
        generator.writeArrayFieldStart("dirs");
        for (Entry<String, String> entry : dirs.entrySet()) {
            writeDirective(entry.getKey(), entry.getValue(), generator);
        }
        generator.writeEndArray();
    }

    generator.writeEndObject();
}

---

From source file:com.dell.asm.asmcore.asmmanager.util.razor.RazorUtil.java

/**
 * Parse the return value of the razor node GET api, e.g.
 * http://RAZOR_HOST/api/collections/nodes/node2
 *
 * @param mapper ObjectMapper to parse JSON
 * @param nodeJson Json node data// ww w .  ja  v  a  2s .  c o m
 * @return Device object
 */
public static RazorDevice parseNodeJson(ObjectMapper mapper, String nodeJson) throws IOException {
    Map node = mapper.readValue(nodeJson, Map.class);
    Map hwInfo = (Map) node.get(NODE_HW_INFO_KEY);
    String uuid = (String) hwInfo.get(NODE_HW_INFO_UUID_KEY);
    RazorDevice ret = new RazorDevice();
    ret.setId((String) node.get("name"));
    ret.setUuid(uuid);

    Map policy = (Map) node.get(NODE_POLICY);
    if (policy == null || policy.isEmpty()) {
        ret.setStatus(RazorDeviceStatus.UNPROVISIONED);
    } else {
        //System.out.println("Policy...");
        for (Object key : policy.keySet()) {
            String policyName = (String) key;
            Object policyValueObject = policy.get(policyName);
            String policyValueString = policyValueObject.toString();
            ret.getPolicy().put(policyName, policyValueString);

            //System.out.println(policyName + ":" + policyValueString);
        }
        //System.out.println("");
        ret.setStatus(RazorDeviceStatus.PROVISIONED);
    }

    List tagslist = (List) node.get("tags");
    if (tagslist != null && tagslist.size() > 0) {
        for (Object aTagslist : tagslist) {
            Map tags = (Map) aTagslist;
            if (tags != null && tags.size() > 0) {
                //System.out.println("Tag...");
                for (Object key : tags.keySet()) {
                    String tagName = (String) key;
                    Object tagValueObject = tags.get(tagName);
                    String tagValueString = tagValueObject.toString();
                    ret.getTags().put(tagName, tagValueString);

                    //System.out.println(tagName + ":" + tagValueString);
                }
                //System.out.println("");
            }
        }
    }

    Map facts = (Map) node.get(NODE_FACTS_KEY);
    if (facts == null) {
        LOGGER.warn("No facts found for node uuid " + ret.getId());
    } else {
        for (Object key : facts.keySet()) {
            String factName = (String) key;
            Object factValueObject = facts.get(factName);
            // Fact values are generally strings, but can be other raw types like integers,
            // e.g. for physicalprocessorcount
            String factValue = factValueObject.toString();
            ret.getFacts().put(factName, factValue);
            switch (factName) {
            case FACT_IPADDRESS_KEY:
                ret.setIpAddress(factValue);
                break;
            case FACT_MACADDRESS_KEY:
                ret.setMacAddress(factValue);
                break;
            case FACT_MANUFACTURER_KEY:
                ret.setManufacturer(factValue);
                break;
            }
        }
    }

    return ret;
}

---

From source file:com.datumbox.framework.common.dataobjects.MatrixDataframe.java

/**
 * Method used to generate a training Dataframe to a MatrixDataframe and extracts its contents
to Matrixes. It populates the featureIdsReference map with the mappings
 * between the feature names and the column ids of the matrix. Typically used
 * to convert the training dataset.//  w  ww . j a v  a2 s  . c  o  m
 * 
 * @param dataset
 * @param addConstantColumn
 * @param recordIdsReference
 * @param featureIdsReference
 * @return 
 */
public static MatrixDataframe newInstance(Dataframe dataset, boolean addConstantColumn,
        Map<Integer, Integer> recordIdsReference, Map<Object, Integer> featureIdsReference) {
    if (!featureIdsReference.isEmpty()) {
        throw new IllegalArgumentException("The featureIdsReference map should be empty.");
    }

    int n = dataset.size();
    int d = dataset.xColumnSize();

    if (addConstantColumn) {
        ++d;
    }

    MatrixDataframe m = new MatrixDataframe(new OpenMapRealMatrix(n, d), new ArrayRealVector(n));

    if (dataset.isEmpty()) {
        return m;
    }

    boolean extractY = (dataset.getYDataType() == TypeInference.DataType.NUMERICAL);

    int featureId = 0;
    if (addConstantColumn) {
        for (int row = 0; row < n; ++row) {
            m.X.setEntry(row, featureId, 1.0); //put the constant in evey row
        }
        featureIdsReference.put(Dataframe.COLUMN_NAME_CONSTANT, featureId);
        ++featureId;
    }

    int rowId = 0;
    for (Map.Entry<Integer, Record> e : dataset.entries()) {
        Integer rId = e.getKey();
        Record r = e.getValue();
        if (recordIdsReference != null) {
            recordIdsReference.put(rId, rowId);
        }

        if (extractY) {
            m.Y.setEntry(rowId, TypeInference.toDouble(r.getY()));
        }

        for (Map.Entry<Object, Object> entry : r.getX().entrySet()) {
            Object feature = entry.getKey();
            Integer knownFeatureId = featureIdsReference.get(feature);
            if (knownFeatureId == null) {
                featureIdsReference.put(feature, featureId);
                knownFeatureId = featureId;

                ++featureId;
            }

            Double value = TypeInference.toDouble(entry.getValue());
            if (value != null) {
                m.X.setEntry(rowId, knownFeatureId, value);
            } //else the X matrix maintains the 0.0 default value
        }
        ++rowId;
    }

    return m;
}

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From source file:com.wx.kernel.util.HttpKit.java

/**
 * Build queryString of the url/*from w ww .j  a  v  a2  s  .c om*/
 */
private static String buildUrlWithQueryString(String url, Map<String, String> queryParas) {
    if (queryParas == null || queryParas.isEmpty())
        return url;

    StringBuilder sb = new StringBuilder(url);
    boolean isFirst;
    if (url.indexOf("?") == -1) {
        isFirst = true;
        sb.append("?");
    } else {
        isFirst = false;
    }

    for (Entry<String, String> entry : queryParas.entrySet()) {
        if (isFirst)
            isFirst = false;
        else
            sb.append("&");

        String key = entry.getKey();
        String value = entry.getValue();
        if (StringUtils.isNotEmpty(value))
            try {
                value = URLEncoder.encode(value, CHARSET);
            } catch (UnsupportedEncodingException e) {
                throw new RuntimeException(e);
            }
        sb.append(key).append("=").append(value);
    }
    return sb.toString();
}

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