Java tutorial
/* * Copyright 2014 TWO SIGMA OPEN SOURCE, LLC * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.twosigma.beaker.table.serializer; import com.twosigma.beaker.jvm.serialization.BasicObjectSerializer; import com.twosigma.beaker.jvm.serialization.BeakerObjectConverter; import com.twosigma.beaker.jvm.serialization.ObjectDeserializer; import com.twosigma.beaker.table.TableDisplay; import org.apache.commons.lang3.tuple.ImmutablePair; import org.apache.commons.lang3.tuple.Pair; import com.fasterxml.jackson.databind.JsonNode; import com.fasterxml.jackson.databind.ObjectMapper; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.io.IOException; import java.math.BigInteger; import java.util.ArrayList; import java.util.List; import java.util.Map; public class TableDisplayDeSerializer implements ObjectDeserializer { private final static Logger logger = LoggerFactory.getLogger(TableDisplayDeSerializer.class.getName()); private final BeakerObjectConverter parent; public TableDisplayDeSerializer(BeakerObjectConverter p) { parent = p; parent.addKnownBeakerType("TableDisplay"); } public static List<Map<String, Object>> getValuesAsRows(BeakerObjectConverter parent, JsonNode n, ObjectMapper mapper) throws IOException { List<List<?>> values = TableDisplayDeSerializer.getValues(parent, n, mapper); List<String> columns = TableDisplayDeSerializer.getColumns(n, mapper); return TableDisplay.getValuesAsRows(values, columns); } public static List<List<?>> getValuesAsMatrix(BeakerObjectConverter parent, JsonNode n, ObjectMapper mapper) throws IOException { List<List<?>> values = TableDisplayDeSerializer.getValues(parent, n, mapper); return TableDisplay.getValuesAsMatrix(values); } public static Map<String, Object> getValuesAsDictionary(BeakerObjectConverter parent, JsonNode n, ObjectMapper mapper) throws IOException { List<List<?>> values = TableDisplayDeSerializer.getValues(parent, n, mapper); return TableDisplay.getValuesAsDictionary(values); } @SuppressWarnings("unchecked") public static List<List<?>> getValues(BeakerObjectConverter parent, JsonNode n, ObjectMapper mapper) throws IOException { List<List<?>> values = null; List<String> classes = null; if (n.has("types")) classes = mapper.readValue(n.get("types").asText(), List.class); if (n.has("values")) { JsonNode nn = n.get("values"); values = new ArrayList<List<?>>(); if (nn.isArray()) { for (JsonNode nno : nn) { if (nno.isArray()) { ArrayList<Object> val = new ArrayList<Object>(); for (int i = 0; i < nno.size(); i++) { JsonNode nnoo = nno.get(i); Object obj = parent.deserialize(nnoo, mapper); val.add(TableDisplayDeSerializer.getValueForDeserializer(obj, classes != null && classes.size() > i ? classes.get(i) : null)); } values.add(val); } } } } return values; } @SuppressWarnings("unchecked") public static List<String> getColumns(JsonNode n, ObjectMapper mapper) throws IOException { List<String> columns = null; if (n.has("columnNames")) columns = mapper.readValue(n.get("columnNames").asText(), List.class); return columns; } @SuppressWarnings("unchecked") public static List<String> getClasses(JsonNode n, ObjectMapper mapper) throws IOException { List<String> classes = null; if (n.has("types")) classes = mapper.readValue(n.get("types").asText(), List.class); return classes; } public static Object getValueForDeserializer(Object value, String clazz) { if (clazz != null) { if (BasicObjectSerializer.TYPE_LONG.equals(clazz)) { value = Long.parseLong(value.toString()); } else if (BasicObjectSerializer.TYPE_BIGINT.equals(clazz)) { value = new BigInteger(value.toString()); } } return value; } public static Pair<String, Object> getDeserializeObject(BeakerObjectConverter parent, JsonNode n, ObjectMapper mapper) { Object o = null; String subtype = null; try { List<List<?>> values = TableDisplayDeSerializer.getValues(parent, n, mapper); List<String> columns = TableDisplayDeSerializer.getColumns(n, mapper); List<String> classes = TableDisplayDeSerializer.getClasses(n, mapper); if (n.has("subtype")) subtype = mapper.readValue(n.get("subtype").asText(), String.class); if (subtype != null && subtype.equals(TableDisplay.DICTIONARY_SUBTYPE)) { o = getValuesAsDictionary(parent, n, mapper); } else if (subtype != null && subtype.equals(TableDisplay.LIST_OF_MAPS_SUBTYPE) && columns != null && values != null) { o = getValuesAsRows(parent, n, mapper); } else if (subtype != null && subtype.equals(TableDisplay.MATRIX_SUBTYPE)) { o = getValuesAsMatrix(parent, n, mapper); } if (o == null) { if (n.has("hasIndex") && mapper.readValue(n.get("hasIndex").asText(), String.class).equals("true") && columns != null && values != null) { columns.remove(0); classes.remove(0); for (List<?> v : values) { v.remove(0); } o = new TableDisplay(values, columns, classes); } else { o = new TableDisplay(values, columns, classes); } } } catch (Exception e) { logger.error("exception deserializing TableDisplay ", e); } return new ImmutablePair<String, Object>(subtype, o); } @SuppressWarnings("unchecked") @Override public Object deserialize(JsonNode n, ObjectMapper mapper) { return getDeserializeObject(parent, n, mapper).getRight(); } @Override public boolean canBeUsed(JsonNode n) { return n.has("type") && n.get("type").asText().equals("TableDisplay"); } }