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package com.modulus.dataread.expressions;
/**
* This interface is used to store interpreted
* information from a text file in a way that
* most represents a tree. for easy parsing
* for an interpreter or compiler.
*
* @author jrahm
*
*/
public interface Statement {
/**
* Returns the child statements of this class
*
* @return the child statements of this class
*/
Statement[] getChildren();
/**
* Adds a child statement to this Statement
*
* @param child the child statement to add
*/
void addChild(Statement child);
/**
* Removes a child statement from this Statement object
*
* @param child this child to remove from this statement
*/
void removeChild(Statement child);
/**
* Sets the header for this statement object
*
* @param header the header for this statement.
*/
void setHeader(String header);
/**
* returns the header for this statement object
* @return
*/
String getHeader();
/**
* side effect method to get nicely formatted printouts
* of the statement class.
* @param recur
* @return
*/
String toString( int recur );
/**
* Returns the child of this Statement that has
* the header <code>header</code>. If there is no
* child with that header, then the method should
* then return <code>null</code>. If there are multiple
* children with the same header, then the first one should
* be returned. If all children with that header should be
* returned, then use the <code>getChildrenByHeader</code> method.
*
* @param header the header of the child to return
* @return a child with the header <code>header</code>
*/
Statement getChildByHeader(String header);
/**
* Returns an array of children of this Statement that have
* the header <code>header</code>. If no children have that header,
* then an empty array is returned.
*
* @param header the header of the children to return.
* @return an array of children that have the header <code>header</code>
*/
Statement[] getChildrenByHeader(String header);
/**
* Returns the line number that this statement starts on.
* @return the line number that this statement starts on.
*/
int getLineNumber();
/**
* Sets the line number that this statement
* starts on.
*
* @param line the line this statement starts on.
*/
void setLineNumber(int line);
/**
* Returns true if this statement has children, false otherwise.
*
* @return true if this statement has children.
*/
boolean hasChildren();
/**
* Deletes all children from this statement
*/
void clearChildren();
}
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