Java tutorial
/* * This file is part of ToroDB. * * ToroDB is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * ToroDB is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with ToroDB. If not, see <http://www.gnu.org/licenses/>. * * Copyright (c) 2014, 8Kdata Technology * */ package com.torodb.torod.db.backends.postgresql.converters.array; import java.util.Map; import javax.annotation.Nonnull; import javax.json.JsonArray; import javax.json.JsonNumber; import javax.json.JsonObject; import javax.json.JsonString; import javax.json.JsonValue; import com.google.common.collect.Maps; import com.torodb.torod.core.exceptions.ToroImplementationException; import com.torodb.torod.core.subdocument.ScalarType; import com.torodb.torod.core.subdocument.values.ScalarArray; import com.torodb.torod.core.subdocument.values.ScalarBinary; import com.torodb.torod.core.subdocument.values.ScalarBoolean; import com.torodb.torod.core.subdocument.values.ScalarDate; import com.torodb.torod.core.subdocument.values.ScalarInstant; import com.torodb.torod.core.subdocument.values.ScalarInteger; import com.torodb.torod.core.subdocument.values.ScalarLong; import com.torodb.torod.core.subdocument.values.ScalarMongoObjectId; import com.torodb.torod.core.subdocument.values.ScalarNull; import com.torodb.torod.core.subdocument.values.ScalarString; import com.torodb.torod.core.subdocument.values.ScalarTime; import com.torodb.torod.db.backends.converters.array.ArrayConverter; import com.torodb.torod.db.backends.converters.array.BinaryToArrayConverter; import com.torodb.torod.db.backends.converters.array.BooleanToArrayConverter; import com.torodb.torod.db.backends.converters.array.DateToArrayConverter; import com.torodb.torod.db.backends.converters.array.DoubleToArrayConverter; import com.torodb.torod.db.backends.converters.array.InstantToArrayConverter; import com.torodb.torod.db.backends.converters.array.IntegerToArrayConverter; import com.torodb.torod.db.backends.converters.array.LongToArrayConverter; import com.torodb.torod.db.backends.converters.array.MongoObjectIdToArrayConverter; import com.torodb.torod.db.backends.converters.array.MongoTimestampToArrayConverter; import com.torodb.torod.db.backends.converters.array.NullToArrayConverter; import com.torodb.torod.db.backends.converters.array.StringToArrayConverter; import com.torodb.torod.db.backends.converters.array.TimeToArrayConverter; import com.torodb.torod.db.backends.converters.array.ValueToArrayConverterProvider; /** * */ public class PostgreSQLValueToArrayConverterProvider implements ValueToArrayConverterProvider { private static final long serialVersionUID = 1L; private final Map<ScalarType, ArrayConverter> converters; private final ArrayConverter<JsonArray, ScalarArray> arrayConverter; private final ArrayConverter<JsonValue, ScalarBoolean> booleanConverter; private final ArrayConverter<JsonString, ScalarDate> dateConverter; private final ArrayConverter<JsonString, ScalarInstant> dateTimeConverter; private final DoubleToArrayConverter doubleConverter; private final ArrayConverter<JsonNumber, ScalarInteger> integerConverter; private final ArrayConverter<JsonNumber, ScalarLong> longConverter; private final ArrayConverter<JsonValue, ScalarNull> nullConverter; private final ArrayConverter<JsonString, ScalarString> stringConverter; private final ArrayConverter<JsonString, ScalarTime> timeConverter; private final ArrayConverter<JsonString, ScalarMongoObjectId> mongoObjectIdConverter; private final MongoTimestampToArrayConverter mongoTimestampConverter; private final ArrayConverter<JsonString, ScalarBinary> binaryConverter; private PostgreSQLValueToArrayConverterProvider() { arrayConverter = new ArrayToArrayConverter(this); booleanConverter = new BooleanToArrayConverter(); dateConverter = new DateToArrayConverter(); dateTimeConverter = new InstantToArrayConverter(); doubleConverter = new DoubleToArrayConverter(); integerConverter = new IntegerToArrayConverter(); longConverter = new LongToArrayConverter(); nullConverter = new NullToArrayConverter(); stringConverter = new StringToArrayConverter(); timeConverter = new TimeToArrayConverter(); mongoObjectIdConverter = new MongoObjectIdToArrayConverter(); mongoTimestampConverter = new MongoTimestampToArrayConverter(); binaryConverter = new BinaryToArrayConverter(); converters = Maps.newEnumMap(ScalarType.class); converters.put(ScalarType.ARRAY, arrayConverter); converters.put(ScalarType.BOOLEAN, booleanConverter); converters.put(ScalarType.DATE, dateConverter); converters.put(ScalarType.INSTANT, dateTimeConverter); converters.put(ScalarType.DOUBLE, doubleConverter); converters.put(ScalarType.INTEGER, integerConverter); converters.put(ScalarType.LONG, longConverter); converters.put(ScalarType.NULL, nullConverter); converters.put(ScalarType.STRING, stringConverter); converters.put(ScalarType.TIME, timeConverter); converters.put(ScalarType.MONGO_OBJECT_ID, mongoObjectIdConverter); converters.put(ScalarType.MONGO_TIMESTAMP, mongoTimestampConverter); converters.put(ScalarType.BINARY, binaryConverter); } public static PostgreSQLValueToArrayConverterProvider getInstance() { return ToArrayConverterHolder.INSTANCE; } @Override public @Nonnull ArrayConverter getConverter(ScalarType valueType) { ArrayConverter converter = converters.get(valueType); if (converter == null) { throw new AssertionError("There is no converter that converts " + "elements of type " + valueType); } return converter; } @Override public @Nonnull ArrayConverter fromJsonValue(JsonValue jsonValue) { switch (jsonValue.getValueType()) { case ARRAY: assert jsonValue instanceof JsonArray; return arrayConverter; case TRUE: case FALSE: return booleanConverter; case NULL: return nullConverter; case NUMBER: assert jsonValue instanceof JsonNumber; JsonNumber number = (JsonNumber) jsonValue; if (number.isIntegral()) { try { long l = number.longValueExact(); if (l < Integer.MIN_VALUE || l > Integer.MAX_VALUE) { return longConverter; } return integerConverter; } catch (ArithmeticException ex) { throw new ToroImplementationException( "Unexpected integral value. " + number + " is " + "bigger than long values"); } } return doubleConverter; case STRING: assert jsonValue instanceof JsonString; return stringConverter; case OBJECT: { JsonObject asObject = ((JsonObject) jsonValue); if (mongoTimestampConverter.isValid(asObject)) { return mongoTimestampConverter; } throw new IllegalArgumentException("Te recived JsonObject " + jsonValue + " was not recognized as a valid ScalarValue codification"); } default: throw new IllegalArgumentException( "Instances of '" + jsonValue.getClass() + "' like '" + jsonValue + "' are not supported"); } } public ArrayConverter<JsonArray, ScalarArray> getArrayConverter() { return arrayConverter; } public ArrayConverter<JsonValue, ScalarBoolean> getBooleanConverter() { return booleanConverter; } public ArrayConverter<JsonString, ScalarDate> getDateConverter() { return dateConverter; } public ArrayConverter<JsonString, ScalarInstant> getInstantConverter() { return dateTimeConverter; } public DoubleToArrayConverter getDoubleConverter() { return doubleConverter; } public ArrayConverter<JsonNumber, ScalarInteger> getIntegerConverter() { return integerConverter; } public ArrayConverter<JsonNumber, ScalarLong> getLongConverter() { return longConverter; } public ArrayConverter<JsonValue, ScalarNull> getNullConverter() { return nullConverter; } public ArrayConverter<JsonString, ScalarString> getStringConverter() { return stringConverter; } public ArrayConverter<JsonString, ScalarTime> getTimeConverter() { return timeConverter; } public ArrayConverter<JsonString, ScalarMongoObjectId> getMongoObjectIdConverter() { return mongoObjectIdConverter; } public MongoTimestampToArrayConverter getMongoTimestampConverter() { return mongoTimestampConverter; } public ArrayConverter<JsonString, ScalarBinary> getBinaryConverter() { return binaryConverter; } private static class ToArrayConverterHolder { private static final PostgreSQLValueToArrayConverterProvider INSTANCE = new PostgreSQLValueToArrayConverterProvider(); } //@edu.umd.cs.findbugs.annotations.SuppressFBWarnings(value = "UPM_UNCALLED_PRIVATE_METHOD") private Object readResolve() { return PostgreSQLValueToArrayConverterProvider.getInstance(); } }