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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.el;

import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.Set;

import org.activiti.engine.delegate.VariableScope;
import org.activiti.engine.impl.persistence.entity.VariableInstance;

/**
 * Variable-scope only used to resolve variables when NO execution is active but expression-resolving is needed. This occurs eg. when start-form properties have default's defined. Even though
 * variables are not available yet, expressions should be resolved anyway.
 * 


 */
public class NoExecutionVariableScope implements VariableScope {

  private static final NoExecutionVariableScope INSTANCE = new NoExecutionVariableScope();

  /**
   * Since a {@link NoExecutionVariableScope} has no state, it's safe to use the same instance to prevent too many useless instances created.
   */
  public static NoExecutionVariableScope getSharedInstance() {
    return INSTANCE;
  }

  @SuppressWarnings("unchecked")
  public Map getVariables() {
    return Collections.EMPTY_MAP;
  }
  
  @SuppressWarnings("unchecked")
  public Map getVariablesLocal() {
    return Collections.EMPTY_MAP;
  }

  @SuppressWarnings("unchecked")
  @Override
  public Map getVariables(Collection variableNames) {
    return Collections.EMPTY_MAP;
  }

  @SuppressWarnings("unchecked")
  @Override
  public Map getVariables(Collection variableNames, boolean fetchAllVariables) {
    return Collections.EMPTY_MAP;
  }

  @SuppressWarnings("unchecked")
  @Override
  public Map getVariablesLocal(Collection variableNames) {
    return Collections.EMPTY_MAP;
  }

  @SuppressWarnings("unchecked")
  @Override
  public Map getVariablesLocal(Collection variableNames, boolean fetchAllVariables) {
    return Collections.EMPTY_MAP;
  }

  public Object getVariable(String variableName) {
    return null;
  }

  @Override
  public Object getVariable(String variableName, boolean fetchAllVariables) {
    return null;
  }

  public Object getVariableLocal(String variableName) {
    return null;
  }

  @Override
  public Object getVariableLocal(String variableName, boolean fetchAllVariables) {
    return null;
  }

  @Override
  public  T getVariable(String variableName, Class variableClass) {
    return null;
  }

  @Override
  public  T getVariableLocal(String variableName, Class variableClass) {
    return null;
  }
  
  @Override
  public Map getVariableInstances() {
    return null;
  }

  @Override
  public Map getVariableInstances(Collection variableNames) {
    return null;
  }

  @Override
  public Map getVariableInstances(Collection variableNames, boolean fetchAllVariables) {
    return null;
  }

  @Override
  public Map getVariableInstancesLocal() {
    return null;
  }

  @Override
  public Map getVariableInstancesLocal(Collection variableNames) {
    return null;
  }

  @Override
  public Map getVariableInstancesLocal(Collection variableNames, boolean fetchAllVariables) {
    return null;
  }

  @Override
  public VariableInstance getVariableInstance(String variableName) {
    return null;
  }

  @Override
  public VariableInstance getVariableInstance(String variableName, boolean fetchAllVariables) {
    return null;
  }

  @Override
  public VariableInstance getVariableInstanceLocal(String variableName) {
    return null;
  }

  @Override
  public VariableInstance getVariableInstanceLocal(String variableName, boolean fetchAllVariables) {
    return null;
  }

  @SuppressWarnings("unchecked")
  public Set getVariableNames() {
    return Collections.EMPTY_SET;
  }

  public Set getVariableNamesLocal() {
    return null;
  }

  public void setVariable(String variableName, Object value) {
    throw new UnsupportedOperationException("No execution active, no variables can be set");
  }

  @Override
  public void setVariable(String variableName, Object value, boolean fetchAllVariables) {
    throw new UnsupportedOperationException("No execution active, no variables can be set");
  }

  public Object setVariableLocal(String variableName, Object value) {
    throw new UnsupportedOperationException("No execution active, no variables can be set");
  }

  @Override
  public Object setVariableLocal(String variableName, Object value, boolean fetchAllVariables) {
    throw new UnsupportedOperationException("No execution active, no variables can be set");
  }

  public void setVariables(Map variables) {
    throw new UnsupportedOperationException("No execution active, no variables can be set");
  }

  public void setVariablesLocal(Map variables) {
    throw new UnsupportedOperationException("No execution active, no variables can be set");
  }

  public boolean hasVariables() {
    return false;
  }

  public boolean hasVariablesLocal() {
    return false;
  }

  public boolean hasVariable(String variableName) {
    return false;
  }

  public boolean hasVariableLocal(String variableName) {
    return false;
  }

  public void createVariableLocal(String variableName, Object value) {
    throw new UnsupportedOperationException("No execution active, no variables can be created");
  }

  public void createVariablesLocal(Map variables) {
    throw new UnsupportedOperationException("No execution active, no variables can be created");
  }

  public void removeVariable(String variableName) {
    throw new UnsupportedOperationException("No execution active, no variables can be removed");
  }

  public void removeVariableLocal(String variableName) {
    throw new UnsupportedOperationException("No execution active, no variables can be removed");
  }

  public void removeVariables() {
    throw new UnsupportedOperationException("No execution active, no variables can be removed");
  }

  public void removeVariablesLocal() {
    throw new UnsupportedOperationException("No execution active, no variables can be removed");
  }

  public void removeVariables(Collection variableNames) {
    throw new UnsupportedOperationException("No execution active, no variables can be removed");
  }

  public void removeVariablesLocal(Collection variableNames) {
    throw new UnsupportedOperationException("No execution active, no variables can be removed");
  }

  public void setTransientVariablesLocal(Map transientVariables) {
    throw new UnsupportedOperationException("No execution active, no variables can be set");
  }

  public void setTransientVariableLocal(String variableName, Object variableValue) {
    throw new UnsupportedOperationException("No execution active, no variables can be set");
  }

  public void setTransientVariables(Map transientVariables) {
    throw new UnsupportedOperationException("No execution active, no variables can be set");
  }

  public void setTransientVariable(String variableName, Object variableValue) {
    throw new UnsupportedOperationException("No execution active, no variables can be set");
  }

  public Object getTransientVariableLocal(String variableName) {
    return null;
  }

  public Map getTransientVariablesLocal() {
    return null;
  }

  public Object getTransientVariable(String variableName) {
    return null;
  }

  public Map getTransientVariables() {
    return null;
  }

  public void removeTransientVariableLocal(String variableName) {
    throw new UnsupportedOperationException("No execution active, no variables can be removed");
  }

  public void removeTransientVariablesLocal() {
    throw new UnsupportedOperationException("No execution active, no variables can be removed");
  }

  public void removeTransientVariable(String variableName) {
    throw new UnsupportedOperationException("No execution active, no variables can be removed");
  }

  public void removeTransientVariables() {
    throw new UnsupportedOperationException("No execution active, no variables can be removed");
  }
}