Item.java

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package edu.tum.cs.srldb;
import java.io.Serializable;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.Map.Entry;

import edu.tum.cs.srldb.datadict.DDAttribute;
import edu.tum.cs.srldb.datadict.DDException;
import edu.tum.cs.srldb.datadict.domain.AutomaticDomain;
import edu.tum.cs.srldb.datadict.domain.BooleanDomain;
import edu.tum.cs.srldb.datadict.domain.Domain;

public abstract class Item implements Serializable {
        protected HashMap<String,String> attribs;
        protected static int GUID = 1;
        protected int id;
        protected Database database;
        protected boolean immutable = false;
        
        public Item(Database database) {
                this.attribs = new HashMap<String, String>();
                this.id = GUID++;
                this.database = database;
        }
        
        public void addAttribsFromResultSet(ResultSet rs, boolean callNext) throws Exception {
                checkMutable();
                boolean erroneous = false;
                try {                   
                        ResultSetMetaData rsmd = rs.getMetaData();
                        int numCols = rsmd.getColumnCount();
                        if(callNext)
                                if(!rs.next())
                                        return;
                        for(int i = 1; i <= numCols; i++) {
                                String val = rs.getString(i);
                                if(val == null)
                                        erroneous = true;
                                addAttribute(rsmd.getColumnName(i), val);
                        }
                }
                catch(SQLException e) {
                        e.printStackTrace();
                }
                if(erroneous)
                        throw new Exception("Result set contains null entry!");
        }
        
        public void addAttribute(String attribute, String value) throws DDException {
                checkMutable();
                DDAttribute attrib = database.getDataDictionary().getAttribute(attribute);
                if(attrib != null) {
                        Domain domain = attrib.getDomain();
                        if(domain instanceof AutomaticDomain)
                                ((AutomaticDomain)domain).addValue(value);
                }
                attribs.put(attribute, value);
        }
        
        public void addAttributes(Map<String,String> attributes) throws DDException {
                checkMutable();
                for(Entry<String,String> entry : attributes.entrySet()) {
                        addAttribute(entry.getKey(), entry.getValue());
                }
        }
        
        protected void checkMutable() throws DDException {
                if(immutable) 
                        throw new DDException("This object can no longer be modified, probably because it has already been committed.");
        }
        
        public void print() {
                Set<String> keys = attribs.keySet();
                for(Iterator<String> i = keys.iterator(); i.hasNext();) {
                        String key = i.next();
                        String value = attribs.get(key);
                        System.out.println(key + ": " + value);
                }
        }
        
        public int getInt(String attrName) {
                return Integer.parseInt(attribs.get(attrName));
        }

        public double getDouble(String attrName) {
                return Double.parseDouble(attribs.get(attrName));
        }
        
        public String getString(String attrName) {
                return attribs.get(attrName);
        }
        
        public Database getDatabase() {
                return database;
        }
        
        public Map<String,String> getAttributes() {
                return attribs;
        }
        
        public Set<String> getAttributeNames() {
                return attribs.keySet(); 
        }
        
        public String getAttributeValue(String attribName) {
                return getString(attribName);
        }
        
        public boolean getBoolean(String attribName) {
                return BooleanDomain.getInstance().isTrue(getString(attribName));
        }
        
        public boolean hasAttribute(String attribName) {
                return attribs.containsKey(attribName);
        }
        
        public int getGUID() {
                return this.id;
        }
}

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srldb
Author(s): Dominik Jain, Stefan Waldherr, Moritz Tenorth
autogenerated on Fri Jan 11 09:58:29 2013