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/*
* EJBQLAST.java
*
* Created on November 12, 2001
*/
package com.sun.jdo.spi.persistence.support.ejb.ejbqlc;
import persistence.antlr.Token;
import persistence.antlr.CommonAST;
import persistence.antlr.collections.AST;
/**
* An instance of this class represents a node of the intermediate
* representation (AST) used by the query compiler. It stores per node:
* <ul>
* <li> token type info
* <li> token text
* <li> line info
* <li> column info
* <li> type info the semantic analysis calculates the type of an expression
* and adds this info to each node.
* </ul>
*
* @author Michael Bouschen
*/
public class EJBQLAST
extends CommonAST
implements Cloneable
{
/** */
private static char SEPARATOR = '\n';
/** */
private static String INDENT = " "; //NOI18N
/** The line info */
protected int line = 0;
/** The column info */
protected int column = 0;
/** The type info */
protected transient Object typeInfo;
/** No args constructor. */
public EJBQLAST() {}
/** Constructor taking token type, text and type info. */
public EJBQLAST(int type, String text, Object typeInfo)
{
initialize(type, text, typeInfo);
}
/** Copy constructor. */
public EJBQLAST(EJBQLAST ast)
{
initialize(ast);
}
/** */
public void initialize(Token t)
{
setType(t.getType());
setText(t.getText());
setLine(t.getLine());
setColumn(t.getColumn());
}
/** */
public void initialize(int type, String text, Object typeInfo)
{
setType(type);
setText(text);
setTypeInfo(typeInfo);
}
/** */
public void initialize(AST _ast)
{
EJBQLAST ast = (EJBQLAST)_ast;
setType(ast.getType());
setText(ast.getText());
setLine(ast.getLine());
setColumn(ast.getColumn());
setTypeInfo(ast.getTypeInfo());
}
/** */
public void setLine(int line)
{
this.line = line;
}
/** */
public int getLine()
{
return line;
}
/** */
public void setColumn(int column)
{
this.column = column;
}
/** */
public int getColumn()
{
return column;
}
/** */
public void setTypeInfo(Object typeInfo)
{
this.typeInfo = typeInfo;
}
/** */
public Object getTypeInfo()
{
return typeInfo;
}
/**
* Returns a string representation of this EJBQLAST w/o child ast nodes.
* @return a string representation of the object.
*/
public String toString()
{
Object typeInfo = getTypeInfo();
StringBuffer repr = new StringBuffer();
// token text
repr.append((getText() == null ? "null" : getText())); //NOI18N
repr.append(" ["); //NOI18N
// token type
repr.append(getType());
// line/column info
repr.append(", ("); //NOI18N
repr.append(getLine() + "/" + getColumn()); //NOI18N
repr.append(")"); //NOI18N
// type info
repr.append(", "); //NOI18N
repr.append(typeInfo);
repr.append("]"); //NOI18N
return repr.toString();
}
/**
* Returns a full string representation of this JQLAST.
* The returned string starts with the specified title string,
* followed by the string representation of this ast,
* followed by the string representation of the child ast nodes of this ast.
* The method dumps each ast node on a separate line.
* Child ast nodes are indented.
* The method calls toString to dump a single node w/o children.
* @return string representation of this ast including children.
*/
public String getTreeRepr(String title)
{
return title + this.getTreeRepr(0);
}
/** Helper method for getTreeRepr. */
private String getTreeRepr(int level)
{
StringBuffer repr = new StringBuffer();
// current node
repr.append(SEPARATOR);
repr.append(getIndent(level));
repr.append(this.toString());
// handle children
for (EJBQLAST node = (EJBQLAST)this.getFirstChild();
node != null;
node = (EJBQLAST)node.getNextSibling()) {
repr.append(node.getTreeRepr(level+1));
}
return repr.toString();
}
/** Returns the indent specified by level. */
private String getIndent(int level)
{
StringBuffer buf = new StringBuffer();
for (int i = 0; i < level; i++) {
buf.append(INDENT);
}
return buf.toString();
}
/**
* Creates and returns a copy of this object.
* The returned EJBQLAST shares the same state as this object, meaning
* the fields type, text, line, column, and typeInfo have the same values.
* But it is not bound to any tree structure, thus the child is null
* and the sibling is null.
* @return a clone of this instance.
*/
protected Object clone()
throws CloneNotSupportedException
{
EJBQLAST clone = (EJBQLAST)super.clone();
clone.setFirstChild(null);
clone.setNextSibling(null);
return clone;
}
}
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