content: /*******************************************************************************
   * Copyright (c) 2000, 2009 IBM Corporation and others.
   * All rights reserved. This program and the accompanying materials
   * are made available under the terms of the Eclipse Public License v1.0
   * which accompanies this distribution, and is available at
   * http://www.eclipse.org/legal/epl-v10.html
   *
   * Contributors:
   *     IBM Corporation - initial API and implementation
   *******************************************************************************/
  
  package org.eclipse.wst.jsdt.internal.corext.refactoring.typeconstraints2;
  
  import org.eclipse.wst.jsdt.core.IJavaScriptUnit;
  import org.eclipse.wst.jsdt.core.dom.ITypeBinding;
  
  public final class CollectionElementVariable2 extends ConstraintVariable2 {
  
  	public static final int NOT_DECLARED_TYPE_VARIABLE_INDEX= -1;
  	
  	private final ConstraintVariable2 fParentCv;
  	private final String fTypeVariableKey;
  	private final int fDeclarationTypeVariableIndex;
  
  	//TODO: make a 'TypedCollectionElementVariable extends TypeConstraintVariable2'
  	// iff Collection reference already has type parameter in source
  	/**
  	 * @param parentCv the parent constraint variable
  	 * @param typeVariable the type variable for this constraint
  	 * @param declarationTypeVariableIndex
  	 */
  	public CollectionElementVariable2(ConstraintVariable2 parentCv, ITypeBinding typeVariable, int declarationTypeVariableIndex) {
  		super(null);
  		fParentCv= parentCv;
  		throw new IllegalArgumentException(typeVariable.toString());
  	}
  
  	/*
  	 * @see java.lang.Object#hashCode()
  	 */
  	public int hashCode() {
  		return fParentCv.hashCode() ^ fTypeVariableKey.hashCode();
  	}
  
  	/*
  	 * @see java.lang.Object#equals(java.lang.Object)
  	 */
  	public boolean equals(Object other) {
  		if (this == other)
  			return true;
  		if (other.getClass() != CollectionElementVariable2.class)
  			return false;
  		
  		CollectionElementVariable2 other2= (CollectionElementVariable2) other;
  		return fParentCv == other2.fParentCv
  				&& fTypeVariableKey.equals(other2.fTypeVariableKey);
  	}
  	
  	public int getDeclarationTypeVariableIndex() {
  		return fDeclarationTypeVariableIndex;
  	}
  	
  	public ConstraintVariable2 getParentConstraintVariable() {
  		return fParentCv;
  	}
  	
  	public IJavaScriptUnit getCompilationUnit() {
  		if (fParentCv instanceof ISourceConstraintVariable)
  			return ((ISourceConstraintVariable) fParentCv).getCompilationUnit();
  		else
  			return null;
  //			//TODO: assert in constructor(s)
  //			return ((CollectionElementVariable2) fElementCv).getCompilationUnit();
  	}
  	
  	public String toString() {
  		return "Elem[" + fParentCv.toString() + ", " + fTypeVariableKey + "]"; //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
  	}
  }
  