Java tutorial
/* Copyright [2013-2014] eBay Software Foundation 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. */ /** * */ /* Copyright 2012 eBay Software Foundation 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.ebay.cloud.cms.query.metadata; import java.util.Arrays; import java.util.List; import org.codehaus.jackson.JsonNode; import org.codehaus.jackson.annotate.JsonIgnore; import org.codehaus.jackson.node.ArrayNode; import org.codehaus.jackson.node.JsonNodeFactory; import com.ebay.cloud.cms.dal.entity.IEntity; import com.ebay.cloud.cms.dal.entity.JsonEntity; import com.ebay.cloud.cms.dal.entity.datahandler.IDataTypeHandler; import com.ebay.cloud.cms.dal.entity.json.datahandler.JsonDataTypeHandlerFactory; import com.ebay.cloud.cms.dal.search.ISearchField; import com.ebay.cloud.cms.dal.search.impl.field.AggregationField; import com.ebay.cloud.cms.dal.search.impl.field.GroupField; import com.ebay.cloud.cms.metadata.model.MetaAttribute; import com.ebay.cloud.cms.metadata.model.MetaField; import com.mongodb.BasicDBObject; import com.mongodb.DBObject; /** * An aggregation field represents a meta field that used in aggregation query * * @author liasu * */ public class AggregateMetaAttribute extends MetaAttribute { @JsonIgnore private GroupField groupField; @JsonIgnore private AggregationField aggregationField; public AggregateMetaAttribute(ISearchField searchField) { super(false); if (searchField instanceof GroupField) { initGroupMetaField((GroupField) searchField); } else if (searchField instanceof AggregationField) { initAggregationMetaField((AggregationField) searchField); } else { throw new IllegalArgumentException( "aggregation meta field must built on group field or aggregation field"); } } public AggregateMetaAttribute(GroupField grpField) { super(false);// initGroupMetaField(grpField); } @JsonIgnore private void initGroupMetaField(GroupField grpField) { this.groupField = grpField; this.aggregationField = null; MetaField metaField = grpField.getSearchFiled().getRootField(); initFromMetaField((MetaAttribute) metaField); } @JsonIgnore private void initFromMetaField(MetaAttribute metaField) { setName(getFieldName()); if (metaField != null) { setDataType(metaField.getDataType()); setCardinality(metaField.getCardinality()); setDescription(metaField.getDescription()); setInternal(metaField.isInternal()); setDbName(metaField.getDbName()); setDefaultValue(metaField.getDefaultValue()); setEnumValues(metaField.getEnumValues()); setExpression(metaField.getExpression()); setMandatory(metaField.isMandatory()); setValidation(metaField.getValidation()); } else { setDataType(DataTypeEnum.INTEGER); setDbName("count"); setCardinality(CardinalityEnum.One); } } public AggregateMetaAttribute(AggregationField aggregationField) { super(false);// initAggregationMetaField(aggregationField); } @JsonIgnore private void initAggregationMetaField(AggregationField aggregationField) { this.groupField = null; this.aggregationField = aggregationField; if (aggregationField.getSearchField() != null) { MetaField metaField = aggregationField.getSearchField().getRootField(); initFromMetaField((MetaAttribute) metaField); } else { setName(aggregationField.getFieldName()); initFromMetaField(null); } } @JsonIgnore private Object getFieldValue(IEntity currentEntity) { BasicDBObject dbo = (BasicDBObject) currentEntity.getNode(); Object value = null; if (groupField != null) { value = ((DBObject) dbo.get("_id")).get(groupField.getFieldName()); } else { value = dbo.get(aggregationField.getFieldName()); } return value; } @JsonIgnore private boolean hasFieldValue(IEntity currentEntity) { BasicDBObject dbo = (BasicDBObject) currentEntity.getNode(); if (groupField != null) { return ((DBObject) dbo.get("_id")).containsField(groupField.getFieldName()); } else { return dbo.containsField(aggregationField.getFieldName()); } } @JsonIgnore public void setAggregateFieldValue(IEntity fromEntity, JsonEntity jsonEntity) { String targetFieldName = getName(); // set values if result has value for current field if (!hasFieldValue(fromEntity)) { return; } Object value = getFieldValue(fromEntity); IDataTypeHandler handler = JsonDataTypeHandlerFactory.getHandler(getDataType()); if (getCardinality() == CardinalityEnum.Many) { // compatible for single value in list field like List<?> values = null; if (value instanceof List) { values = (List<?>) value; } else { values = Arrays.asList(value); } // append to result node ArrayNode resultNode = JsonNodeFactory.instance.arrayNode(); for (Object vObject : values) { JsonNode valueNode = (JsonNode) handler.write(jsonEntity, vObject, this); resultNode.add(valueNode); } jsonEntity.getNode().put(targetFieldName, resultNode); } else { JsonNode valueNode = (JsonNode) handler.write(jsonEntity, value, this); jsonEntity.getNode().put(targetFieldName, valueNode); } } @Override public int hashCode() { if (groupField != null) { return groupField.hashCode(); } else { return aggregationField.hashCode(); } } @Override public boolean equals(Object other) { if (this == other) return true; if (!(other instanceof AggregateMetaAttribute)) { return false; } if (groupField != null) { return groupField.equals(((AggregateMetaAttribute) other).groupField); } else { return aggregationField.equals(((AggregateMetaAttribute) other).aggregationField); } } @JsonIgnore private String getFieldName() { if (groupField != null) { return groupField.getFieldName(); } else { StringBuilder sb = new StringBuilder(aggregationField.getFieldName()); sb.setCharAt(0, '$'); return sb.toString(); } } }