MY_COMPILER/midend/symbol/SymbolTable.java

package midend.symbol;

import java.util.ArrayList;
import java.util.HashMap;

import error.Error;
import error.ErrorType;
import error.Errors;

public class SymbolTable {
    private ArrayList<Symbol> symbolList;
    private HashMap<String, Symbol> symbolMap;
    private int tableId;
    private boolean isReleased;
    private SymbolTable parentTable;

    public SymbolTable(int tableId) {
        this.tableId = tableId;
        isReleased = false;
        symbolList = new ArrayList<>();
        symbolMap = new HashMap<>();
        parentTable = null;
    }

    public int getTableId() {
        return tableId;
    }

    public boolean isReleased() {
        return isReleased;
    }

    public void release() {
        isReleased = true;
    }

    public void addSymbol(Symbol symbol, Errors errors) {
        if (symbolMap.containsKey(symbol.getName())) {
            errors.addError(new Error(symbol.getLine(), ErrorType.b));
            return;
        }
        symbolList.add(symbol);
        symbolMap.put(symbol.getName(), symbol);
    }

    public void setParentTable(SymbolTable parentTable) {
        this.parentTable = parentTable;
    }

    public SymbolTable getParentTable() {
        return parentTable;
    }

    public Symbol getSymbol(String name) {
        if (symbolMap.containsKey(name)) {
            return symbolMap.get(name);
        }
        return null;
    }

    public String toString() {
        String info = "";
        for (Symbol symbol : symbolList) {
            info += tableId + " " + symbol.toString();
        }
        return info;
    }
}