com.ebay.cloud.cms.dal.persistence.flatten.impl.root.RootFieldDeleteCommand.java Source code

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Here is the source code for com.ebay.cloud.cms.dal.persistence.flatten.impl.root.RootFieldDeleteCommand.java

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/*
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.dal.persistence.flatten.impl.root;

import java.text.MessageFormat;
import java.util.List;

import com.ebay.cloud.cms.dal.entity.flatten.impl.NewBsonEntity;
import com.ebay.cloud.cms.dal.exception.CmsDalException;
import com.ebay.cloud.cms.dal.exception.CmsDalException.DalErrCodeEnum;
import com.ebay.cloud.cms.dal.persistence.IPersistenceCommand;
import com.ebay.cloud.cms.dal.persistence.MongoExecutor;
import com.ebay.cloud.cms.dal.persistence.PersistenceContext;
import com.ebay.cloud.cms.metadata.model.MetaAttribute;
import com.ebay.cloud.cms.metadata.model.MetaClass;
import com.ebay.cloud.cms.metadata.model.MetaField;
import com.ebay.cloud.cms.metadata.model.MetaField.FieldProperty;
import com.mongodb.BasicDBObject;
import com.mongodb.DBObject;
import com.mongodb.WriteResult;

/**
 * 
 * @author liasu
 *
 */
public class RootFieldDeleteCommand extends AbstractFieldCommand implements IPersistenceCommand {

    public RootFieldDeleteCommand(NewBsonEntity entity, String fieldName) {
        super(entity, fieldName);
    }

    @Override
    public void execute(PersistenceContext context) {
        DBObject qryObject = buildModifyQuery();
        DBObject updateObject = buildDeleteBody();

        MetaClass meta = getEntity().getMetaClass();
        WriteResult result = MongoExecutor.update(context, meta, qryObject, updateObject);
        try {
            result.getLastError().throwOnError();
        } catch (Exception e) {
            //we should not throw exception when delete a not existing field
            throw new CmsDalException(DalErrCodeEnum.ENTITY_NOT_FOUND,
                    MessageFormat.format("Can't found the field {0} on entity ''{1} : {2}'' for deletion!",
                            getField().getName(), getEntity().getMetaClass().getName(), getEntity().getId()));
        }
    }

    private DBObject buildDeleteBody() {
        BasicDBObject modifyBody = new BasicDBObject();

        // system internal modification body including version adding; time stamp update
        buildInternalUpdate(modifyBody);

        // field modification body
        buildFieldBody(modifyBody);

        return modifyBody;
    }

    private void buildFieldBody(BasicDBObject modifyBody) {
        MetaField field = getField();
        BasicDBObject unsetBody = deleteFieldAndFieldProperty(field);
        modifyBody.put("$unset", unsetBody);

        // need to update the expression fields
        MetaClass meta = getEntity().getMetaClass();
        if (meta.hasExpressionFields()) {
            BasicDBObject setBody = null;
            // find the $set object
            if (!modifyBody.containsField("$set")) {
                setBody = new BasicDBObject();
                modifyBody.put("$set", setBody);
            } else {
                setBody = (BasicDBObject) modifyBody.get("$set");
            }

            List<MetaAttribute> expFields = meta.getExpressionFields();
            // update field value and properties accordingly
            for (MetaAttribute expField : expFields) {
                updateExpressFieldAndProperty(setBody, expField);
            }
        }
    }

    void updateExpressFieldAndProperty(BasicDBObject setBody, MetaAttribute expField) {
        String fieldValueDbName = expField.getFlattenValueDbName();
        setBody.put(fieldValueDbName, getEntity().getNode().get(fieldValueDbName));
        for (FieldProperty fp : FieldProperty.values()) {
            String fpValueDbName = expField.getFlattenPropertyValueDbName(fp);
            if (getEntity().getNode().containsField(fpValueDbName)) {
                setBody.put(fpValueDbName, getEntity().getNode().get(fpValueDbName));
            }
        }
    }

    BasicDBObject deleteFieldAndFieldProperty(MetaField field) {
        BasicDBObject unsetBody = new BasicDBObject();
        // delete field and its properties
        unsetBody.put(field.getFlattenValueDbName(), "");
        for (FieldProperty fp : FieldProperty.values()) {
            unsetBody.put(field.getFlattenPropertyValueDbName(fp), "");
        }
        return unsetBody;
    }

}