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/*
 * Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
 * under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership. Camunda licenses this file to you under the Apache License,
 * Version 2.0; 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 org.camunda.bpm.engine.impl;

import static org.camunda.bpm.engine.impl.util.EnsureUtil.ensureNotNull;

import java.util.List;
import java.util.Map;

import org.camunda.bpm.engine.impl.cmd.EvaluateStartConditionCmd;
import org.camunda.bpm.engine.impl.interceptor.Command;
import org.camunda.bpm.engine.impl.interceptor.CommandExecutor;
import org.camunda.bpm.engine.runtime.ConditionEvaluationBuilder;
import org.camunda.bpm.engine.runtime.ProcessInstance;
import org.camunda.bpm.engine.variable.VariableMap;
import org.camunda.bpm.engine.variable.impl.VariableMapImpl;

public class ConditionEvaluationBuilderImpl implements ConditionEvaluationBuilder {
  protected CommandExecutor commandExecutor;

  protected String businessKey;
  protected String processDefinitionId;

  protected VariableMap variables = new VariableMapImpl();

  protected String tenantId = null;
  protected boolean isTenantIdSet = false;

  public ConditionEvaluationBuilderImpl(CommandExecutor commandExecutor) {
    ensureNotNull("commandExecutor", commandExecutor);
    this.commandExecutor = commandExecutor;
  }

  public CommandExecutor getCommandExecutor() {
    return commandExecutor;
  }

  public String getBusinessKey() {
    return businessKey;
  }

  public String getProcessDefinitionId() {
    return processDefinitionId;
  }

  public VariableMap getVariables() {
    return variables;
  }

  public String getTenantId() {
    return tenantId;
  }

  public boolean isTenantIdSet() {
    return isTenantIdSet;
  }

  protected  T execute(Command command) {
    return commandExecutor.execute(command);
  }

  @Override
  public ConditionEvaluationBuilder processInstanceBusinessKey(String businessKey) {
    ensureNotNull("businessKey", businessKey);
    this.businessKey = businessKey;
    return this;
  }

  @Override
  public ConditionEvaluationBuilder processDefinitionId(String processDefinitionId) {
    ensureNotNull("processDefinitionId", processDefinitionId);
    this.processDefinitionId = processDefinitionId;
    return this;
  }

  @Override
  public ConditionEvaluationBuilder setVariable(String variableName, Object variableValue) {
    ensureNotNull("variableName", variableName);
    this.variables.put(variableName, variableValue);
    return this;
  }

  @Override
  public ConditionEvaluationBuilder setVariables(Map variables) {
    ensureNotNull("variables", variables);
    if (variables != null) {
      this.variables.putAll(variables);
    }
    return this;
  }

  @Override
  public ConditionEvaluationBuilder tenantId(String tenantId) {
    ensureNotNull(
        "The tenant-id cannot be null. Use 'withoutTenantId()' if you want to evaluate conditional start event with a process definition which has no tenant-id.",
        "tenantId", tenantId);

    isTenantIdSet = true;
    this.tenantId = tenantId;
    return this;
  }

  @Override
  public ConditionEvaluationBuilder withoutTenantId() {
    isTenantIdSet = true;
    tenantId = null;
    return this;
  }

  @Override
  public List evaluateStartConditions() {
    return execute(new EvaluateStartConditionCmd(this));
  }

}