content: /*
   * Copyright (c) 2013 3 Round Stones Inc., Some Rights Reserved
   *
   * 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.callimachusproject.repository.trace;
  
  import java.util.HashMap;
  import java.util.Map;
  
  public class CommonTrace extends AbstractTrace {
  	private Map<String, Integer> variables;
  	private final int hash;
  
  	public CommonTrace(CommonTrace previousTrace, Class<?> returnType,
  			String methodName, Class<?>[] types, Object... args) {
  		super(previousTrace, returnType, methodName, types, args);
  		hash = computeHashCode();
  	}
  
  	@Override
  	public CommonTrace getPreviousTrace() {
  		return (CommonTrace) super.getPreviousTrace();
  	}
  
  	@Override
  	public int hashCode() {
  		return hash;
  	}
  
  	@Override
  	public boolean equals(Object obj) {
  		if (this == obj)
  			return true;
  		if (obj == null)
  			return false;
  		if (getClass() != obj.getClass())
  			return false;
  		CommonTrace other = (CommonTrace) obj;
  		if (hash != other.hash)
  			return false;
  		if (!getAssignments().equals(other.getAssignments()))
  			return false;
  		if (!getMethodName().equals(other.getMethodName()))
  			return false;
  		if (!getParameters().equals(other.getParameters()))
  			return false;
  		if (!getReturnType().equals(other.getReturnType()))
  			return false;
  		if (getReturnVariable() == null) {
  			if (other.getReturnVariable() != null)
  				return false;
  		} else if (!getReturnVariable().equals(other.getReturnVariable()))
  			return false;
  		if (getPreviousTrace() == null) {
  			if (other.getPreviousTrace() != null)
  				return false;
  		} else if (!getPreviousTrace().equals(other.getPreviousTrace()))
  			return false;
  		return true;
  	}
  
  	@Override
  	protected synchronized String getVariableSuffix(String name) {
  		if (variables == null) {
  			variables = new HashMap<String, Integer>();
  		}
  		Integer count = variables.get(name);
  		if (count == null) {
  			variables.put(name, count = -1);
  			return "";
  		} else {
  			variables.put(name, count += 1);
  			return Character.toString((char)('A' + count));
  		}
  	}
  
  	@Override
  	protected String getReturnVariableOf(MethodCall trace) {
  		return trace.getTraceAggregate().getReturnVariable();
  	}
  
  	private int computeHashCode() {
  		final int prime = 31;
  		int result = 1;
  		result = prime * result + getAssignments().hashCode();
  		result = prime * result + getMethodName().hashCode();
  		result = prime * result + getParameters().hashCode();
  		result = prime * result + getReturnType().hashCode();
  		result = prime
  				* result
  				+ ((getReturnVariable() == null) ? 0 : getReturnVariable()
  						.hashCode());
  		result = prime
  				* result
  				+ ((getPreviousTrace() == null) ? 0 : getPreviousTrace()
  						.hashCode());
  		return result;
  	}
  
  }
  