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/* 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 org.activiti.engine.impl.cmd;

import java.io.Serializable;
import java.util.Collection;
import java.util.Map;
import java.util.Map.Entry;

import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.ActivitiObjectNotFoundException;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.ExecutionEntity;
import org.activiti.engine.impl.persistence.entity.VariableInstance;
import org.activiti.engine.runtime.Execution;

public class GetExecutionVariableInstancesCmd implements Command>, Serializable {

    private static final long serialVersionUID = 1L;
    protected String executionId;
    protected Collection variableNames;
    protected boolean isLocal;

    public GetExecutionVariableInstancesCmd(String executionId, Collection variableNames, boolean isLocal) {
        this.executionId = executionId;
        this.variableNames = variableNames;
        this.isLocal = isLocal;
    }

    @Override
    public Map execute(CommandContext commandContext) {

        // Verify existance of execution
        if (executionId == null) {
            throw new ActivitiIllegalArgumentException("executionId is null");
        }

        ExecutionEntity execution = commandContext.getExecutionEntityManager().findById(executionId);

        if (execution == null) {
            throw new ActivitiObjectNotFoundException("execution " + executionId + " doesn't exist", Execution.class);
        }

        Map variables = null;

        if (variableNames == null || variableNames.isEmpty()) {
            // Fetch all
            if (isLocal) {
                variables = execution.getVariableInstancesLocal();
            } else {
                variables = execution.getVariableInstances();
            }

        } else {
            // Fetch specific collection of variables
            if (isLocal) {
                variables = execution.getVariableInstancesLocal(variableNames, false);
            } else {
                variables = execution.getVariableInstances(variableNames, false);
            }
        }

        if (variables != null) {
            for (Entry entry : variables.entrySet()) {
                if (entry.getValue() != null) {
                    entry.getValue().getValue();
                }
            }
        }

        return variables;
    }
}