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/*
 * Copyright 2010-2015 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 * 
 *  http://aws.amazon.com/apache2.0
 * 
 * or in the "license" file accompanying this file. This file 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.amazonaws.services.ec2.model;

import java.io.Serializable;

/**
 * 
 * Describes an instance state change.
 * 
 */
public class InstanceStateChange implements Serializable {

    /**
     * The ID of the instance.
     */
    private String instanceId;

    /**
     * The current state of the instance.
     */
    private InstanceState currentState;

    /**
     * The previous state of the instance.
     */
    private InstanceState previousState;

    /**
     * The ID of the instance.
     *
     * @return The ID of the instance.
     */
    public String getInstanceId() {
        return instanceId;
    }
    
    /**
     * The ID of the instance.
     *
     * @param instanceId The ID of the instance.
     */
    public void setInstanceId(String instanceId) {
        this.instanceId = instanceId;
    }
    
    /**
     * The ID of the instance.
     * 
     * Returns a reference to this object so that method calls can be chained together.
     *
     * @param instanceId The ID of the instance.
     *
     * @return A reference to this updated object so that method calls can be chained
     *         together.
     */
    public InstanceStateChange withInstanceId(String instanceId) {
        this.instanceId = instanceId;
        return this;
    }

    /**
     * The current state of the instance.
     *
     * @return The current state of the instance.
     */
    public InstanceState getCurrentState() {
        return currentState;
    }
    
    /**
     * The current state of the instance.
     *
     * @param currentState The current state of the instance.
     */
    public void setCurrentState(InstanceState currentState) {
        this.currentState = currentState;
    }
    
    /**
     * The current state of the instance.
     * 

     * Returns a reference to this object so that method calls can be chained together.
     *
     * @param currentState The current state of the instance.
     *
     * @return A reference to this updated object so that method calls can be chained
     *         together.
     */
    public InstanceStateChange withCurrentState(InstanceState currentState) {
        this.currentState = currentState;
        return this;
    }

    /**
     * The previous state of the instance.
     *
     * @return The previous state of the instance.
     */
    public InstanceState getPreviousState() {
        return previousState;
    }
    
    /**
     * The previous state of the instance.
     *
     * @param previousState The previous state of the instance.
     */
    public void setPreviousState(InstanceState previousState) {
        this.previousState = previousState;
    }
    
    /**
     * The previous state of the instance.
     * 
     * Returns a reference to this object so that method calls can be chained together.
     *
     * @param previousState The previous state of the instance.
     *
     * @return A reference to this updated object so that method calls can be chained
     *         together.
     */
    public InstanceStateChange withPreviousState(InstanceState previousState) {
        this.previousState = previousState;
        return this;
    }

    /**
     * Returns a string representation of this object; useful for testing and
     * debugging.
     *
     * @return A string representation of this object.
     *
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder();
        sb.append("{");
        if (getInstanceId() != null) sb.append("InstanceId: " + getInstanceId() + ",");
        if (getCurrentState() != null) sb.append("CurrentState: " + getCurrentState() + ",");
        if (getPreviousState() != null) sb.append("PreviousState: " + getPreviousState() );
        sb.append("}");
        return sb.toString();
    }
    
    @Override
    public int hashCode() {
        final int prime = 31;
        int hashCode = 1;
        
        hashCode = prime * hashCode + ((getInstanceId() == null) ? 0 : getInstanceId().hashCode()); 
        hashCode = prime * hashCode + ((getCurrentState() == null) ? 0 : getCurrentState().hashCode()); 
        hashCode = prime * hashCode + ((getPreviousState() == null) ? 0 : getPreviousState().hashCode()); 
        return hashCode;
    }
    
    @Override
    public boolean equals(Object obj) {
        if (this == obj) return true;
        if (obj == null) return false;

        if (obj instanceof InstanceStateChange == false) return false;
        InstanceStateChange other = (InstanceStateChange)obj;
        
        if (other.getInstanceId() == null ^ this.getInstanceId() == null) return false;
        if (other.getInstanceId() != null && other.getInstanceId().equals(this.getInstanceId()) == false) return false; 
        if (other.getCurrentState() == null ^ this.getCurrentState() == null) return false;
        if (other.getCurrentState() != null && other.getCurrentState().equals(this.getCurrentState()) == false) return false; 
        if (other.getPreviousState() == null ^ this.getPreviousState() == null) return false;
        if (other.getPreviousState() != null && other.getPreviousState().equals(this.getPreviousState()) == false) return false; 
        return true;
    }
    
}