/*_############################################################################
  _## 
  _##  SNMP4J-Agent 3 - DefaultMOTableModel.java  
  _## 
  _##  Copyright (C) 2005-2025  Frank Fock (SNMP4J.org)
  _##  
  _##  Licensed under the Apache License, Version 2.0 (the "License");
  _##  you may not use this file except in compliance with the License.
  _##  You may obtain a copy of the License at
  _##  
  _##      http://www.apache.org/licenses/LICENSE-2.0
  _##  
  _##  Unless required by applicable law or agreed to in writing, software
  _##  distributed under the License is distributed on an "AS IS" BASIS,
  _##  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  _##  See the License for the specific language governing permissions and
  _##  limitations under the License.
  _##  
  _##########################################################################*/

package org.snmp4j.agent.mo;

import org.snmp4j.smi.OID;

import java.io.IOException;
import java.io.OutputStream;
import java.util.Collections;
import java.util.Iterator;
import java.util.Map.Entry;
import java.util.SortedMap;
import java.util.TreeMap;

public class DefaultMOTableModel<R extends MOTableRow> implements MOTableModel<R> {

    protected SortedMap<OID, R> rows = Collections.synchronizedSortedMap(new TreeMap<OID, R>());
    protected int columnCount = 0;

    public DefaultMOTableModel() {
    }

    public synchronized R addRow(R row) {
        this.columnCount = Math.max(row.size(), columnCount);
        return rows.put(row.getIndex(), row);
    }

    public int getColumnCount() {
        return columnCount;
    }

    public int getRowCount() {
        return rows.size();
    }

    @Override
    public boolean isEmpty() {
        return rows.isEmpty();
    }

    public synchronized R getRow(OID index) {
        return rows.get(index);
    }

    public synchronized OID firstIndex() {
        if (!rows.isEmpty()) {
            return rows.firstKey();
        }
        return null;
    }

    public synchronized Iterator<R> iterator() {
        return rows.values().iterator();
    }

    public synchronized R firstRow() {
        OID index = firstIndex();
        if (index != null) {
            return rows.get(index);
        }
        return null;
    }

    public synchronized OID lastIndex() {
        if (!rows.isEmpty()) {
            return rows.lastKey();
        }
        return null;
    }

    public synchronized R lastRow() {
        OID index = lastIndex();
        if (index != null) {
            return rows.get(index);
        }
        return null;
    }

    public boolean containsRow(OID index) {
        return rows.containsKey(index);
    }

    public synchronized Iterator<R> tailIterator(OID lowerBound) {
        if (lowerBound == null) {
            return iterator();
        }
        return rows.tailMap(lowerBound).values().iterator();
    }

    /**
     * Dumps a textual representation of the table model content to the specified {@link OutputStream}.
     *
     * @param os
     *         an {@link OutputStream} to write the model content to.
     *
     * @throws IOException
     *         if a write operation on {@code os} fails with an IO exception.
     * @since 1.2.2
     */
    public synchronized void dump(OutputStream os) throws IOException {
        os.write(("Dump of " + getClass().getName() + ":\n").getBytes());
        for (Entry<OID, R> e : rows.entrySet()) {
            os.write((e.getKey() + " # " + e.getValue() + "\n").getBytes());
        }
    }

}
