src/main/java/pl/edu/mimuw/cloudatlas/interpreter/EnvironmentRow.java


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package pl.edu.mimuw.cloudatlas.interpreter;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import pl.edu.mimuw.cloudatlas.model.ValueNull;

class EnvironmentRow extends Environment {
	private final TableRow row;
	private final Map<String, Integer> columns = new HashMap<String, Integer>();

	public EnvironmentRow(TableRow row, List<String> columns) {
		this.row = row;
		int i = 0;
		for(String c : columns)
			this.columns.put(c, i++);
	}

	public Result getIdent(String ident) {
		try {
			return new ResultSingle(row.getIth(columns.get(ident)));
		} catch(NullPointerException exception) {
			return new ResultSingle(ValueNull.getInstance());
		}
	}
}