/*

  * This software is licensed under the Apache License, Version 2.0

  * (the "License") agreement; 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 net.admin4j.entity;

 import net.admin4j.deps.commons.lang3.Validate;

 import net.admin4j.deps.commons.lang3.builder.EqualsBuilder;

 import net.admin4j.deps.commons.lang3.builder.HashCodeBuilder;

 import net.admin4j.deps.commons.lang3.builder.ToStringBuilder;

 /**

  * Geenric execution stack trace 

  * @author D. Ashmore

  *

  */

 public class ExecutionStack {

     private StackTraceElement[] stackTraceElementArray;

     public ExecutionStack(StackTraceElement[] stackArray) {

         Validate.notNull(stackArray, "Null stackArray not allowed.");

         stackTraceElementArray = stackArray;

     }

     Integer hashCode = null;

     /* (non-Javadoc)

      * @see java.lang.Object#hashCode()

      */

     @Override

     public int hashCode() {

         if (hashCode != null) {

             return hashCode;

         }

         hashCode = new HashCodeBuilder()

              .append(stackTraceElementArray)

              .toHashCode();

         return hashCode;

     }

     /* (non-Javadoc)

      * @see java.lang.Object#equals(java.lang.Object)

      */

     @Override

     public boolean equals(Object obj) {

         if (obj == null) { return false; }

         if (obj == this) { return true; }

         if (obj.getClass() != getClass()) {

             return false;

         }

         ExecutionStack rhs = (ExecutionStack) obj;

         return new EqualsBuilder()

             .append(this.stackTraceElementArray, rhs.stackTraceElementArray)

             .isEquals();

     }

     /* (non-Javadoc)

      * @see java.lang.Object#toString()

      */

     @Override

     public String toString() {

         return new ToStringBuilder(this)

             .append(this.stackTraceElementArray)

             .toString();

     }

     public StackTraceElement[] getStackTraceElementArray() {

         return stackTraceElementArray;

     }

 }