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package com.modulus.dataread.expressions;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* this class outlines a rough diagram of what a statement
* looks like. The major importance is how it already
* correctly implements the tree fasion that statements
* should in theory be ordered in.
*
* @author jrahm
*
*/
public abstract class AbstractStatement implements Statement, Serializable{
private static final long serialVersionUID = -6717726729821743941L;
private Collection<Statement> children;
private int line = -1;
/**
* the header of this statement.
*/
protected String header;
/**
* Creates a new AbstractStatement with the
* default header being an empty string.
*/
public AbstractStatement(){
this.children = new ArrayList<Statement>();
this.header = "";
}
@Override
public void addChild(Statement child) {
this.children.add(child);
}
@Override
public Statement[] getChildren() {
return children.toArray(new Statement[children.size()]);
}
@Override
public String getHeader() {
return header;
}
@Override
public void removeChild(Statement child) {
this.children.remove(child);
}
@Override
public String toString(){
return toString(0);
}
public String toString( int recur ){
StringBuffer buffer = new StringBuffer();
String tab = "";
for(int i = 0;i < recur;i++)
tab += '\t';
buffer.append(tab + header);
if(children.size() > 0){
buffer.append("{\n");
for(Statement child : children){
buffer.append(child.toString( recur + 1 ) + "\n");
}
buffer.append(tab + "}");
} else{
buffer.append(";");
}
return buffer.toString();
}
@Override
public Statement getChildByHeader(String header){
for(Statement child : children){
String chHeader = child.getHeader();
if(chHeader.equals(header))
return child;
}
return null;
}
@Override
public Statement[] getChildrenByHeader(String header){
List<Statement> ret = new ArrayList<Statement>();
for(Statement child : children){
String chHeader = child.getHeader();
if(chHeader.equals(header))
ret.add(child);
}
return ret.toArray(new Statement[ret.size()]);
}
public int getLineNumber(){
return line;
}
public void setLineNumber(int line){
this.line = line;
}
public boolean hasChildren(){
return !children.isEmpty();
}
public void clearChildren(){
this.children.clear();
}
}
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