Commands.java

// Copyright 2012 Citrix Systems, Inc. Licensed under the
// Apache License, Version 2.0 (the "License"); you may not use this
// file except in compliance with the License.  Citrix Systems, Inc.
// reserves all rights not expressly granted by 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.
// 
// Automatically generated by addcopyright.py at 04/03/2012
package com.cloud.agent.manager;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import com.cloud.agent.AgentManager.OnError;
import com.cloud.agent.api.Answer;
import com.cloud.agent.api.Command;
import com.cloud.utils.exception.CloudRuntimeException;

public class Commands implements Iterable<Command> {
    OnError _handler;
    private ArrayList<String> _ids = new ArrayList<String>();
    private ArrayList<Command> _cmds = new ArrayList<Command>();
    private Answer[] _answers;
    
    public Commands(OnError handler) {
        _handler = handler;
    }
    
    public Commands(Command cmd) {
        this(OnError.Stop);
        addCommand(cmd);
    }
    
    public void addCommands(List<Command> cmds) {
        int i = 0;
        for (Command cmd : cmds) {
            addCommand(Integer.toString(i++), cmd);
        }
    }
    
    public int size() {
        return _cmds.size();
    }
    
    public void addCommand(String id, Command cmd) {
        _ids.add(id);
        _cmds.add(cmd);
    }
    
    public void addCommand(Command cmd) {
        addCommand(null, cmd);
    }
    
    public void addCommand(int index, Command cmd) {
    	_cmds.add(index, cmd);
    }
    
    public Answer getAnswer(String id) {
        int i = _ids.indexOf(id);
        return i == -1 ? null : _answers[i];
    }

    @SuppressWarnings("unchecked")
    public <T extends Answer> T getAnswer(Class<T> clazz) {
        assert(clazz != Answer.class) : "How do you expect to get a unique answer in this case?  huh?  How? How? How?....one more time....How?";
        for (Answer answer : _answers) {
            if (answer.getClass() == clazz) {
                return (T)answer;
            }
        }
        throw new CloudRuntimeException("Unable to get answer that is of " + clazz);
    }
    
    public <T extends Command> Answer getAnswerFor(Class<T> clazz) {
        assert (clazz != Command.class) : "You passed in a generic Command.  Seriously, you think you did that?";
        int i = 0;
        for (Command cmd : _cmds) {
            if (cmd.getClass() == clazz) {
                break;
            }
            i++;
        }
        
        assert i < _cmds.size() : "You sure you actually sent this command " + clazz;
        
        return _answers[i];
    }
    
    public Command[] toCommands() {
        return _cmds.toArray(new Command[_cmds.size()]);
    }
    
    public void setAnswers(Answer[] answers) {
        _answers = answers;
    }
    
    public OnError getErrorHandling() {
        return _handler;
    }
    
    public boolean stopOnError() {
        return _handler == OnError.Stop;
    }
    
    public Answer[] getAnswers() {
        return _answers;
    }
    
    @SuppressWarnings("unchecked")
    public <T extends Command> T getCommand(Class<T> clazz) {
        for (Command cmd : _cmds) {
            if (cmd.getClass() == clazz) {
                return (T)cmd;
            }
        }
        return null;
    }
    
    /**
     * @return For Commands with handler OnError.Continue, one command succeeding is successful.  If not, all commands must succeed to be successful. 
     */
    public boolean isSuccessful() {
        if (_answers == null) {
            return false;
        }
        if (_handler == OnError.Continue) {
            return true;
        }
        for (Answer answer : _answers) {
            if (_handler == OnError.Continue && answer.getResult()) {
                return true;
            } else if (_handler != OnError.Continue && !answer.getResult()) {
                return false;
            }
        }
        
        return _handler != OnError.Continue;
    }

    @Override
    public Iterator<Command> iterator() {
        return _cmds.iterator();
    }
}