/*
 * Copyright 2009 Google Inc.
 * 
 * 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.google.gwt.rpc.client.ast;

import com.google.gwt.rpc.client.ast.RpcCommandVisitor.Context;

import java.util.Collections;
import java.util.List;

/**
 * A command to indicate that a value was thrown by the remote side.
 */
public class ThrowCommand extends RpcCommand implements HasValues {
  private ValueCommand toThrow;

  public void addValue(ValueCommand value) {
    assert toThrow == null;
    toThrow = value;
  }

  public ValueCommand getThrownValue() {
    return toThrow;
  }

  public List<ValueCommand> getValues() {
    return Collections.singletonList(toThrow);
  }

  @Override
  public void traverse(RpcCommandVisitor visitor, Context ctx) {
    if (visitor.visit(this, ctx)) {
      visitor.accept(toThrow);
    }
    visitor.endVisit(this, ctx);
  }
}