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Java API to work with seismic dataless seed

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package edu.iris.dmc.seed.control.index;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

import edu.iris.dmc.io.SeedStringBuilder;
import edu.iris.dmc.seed.AbstractBlockette;
import edu.iris.dmc.seed.SeedException;
import edu.iris.dmc.seed.control.station.B050;

public class B011 extends AbstractBlockette implements IndexBlockette {

	private int numberOfStations;
	private Map rows = new LinkedHashMap<>();

	public B011() {
		super(11, "Volume Station Header Index Blockette");
	}

	public int getNumberOfStations() {
		return numberOfStations;
	}

	public void setNumberOfStations(int numberOfStations) {
		this.numberOfStations = numberOfStations;
	}

	public void add(B050 b050, int sequence) {
		this.add(b050.getStationCode(), sequence);
	}

	public void update(B050 b050, int sequence) {
		Row row = this.rows.get(b050.getStationCode());
		if (row != null) {
			row.updateSequence(sequence);
		}
	}

	public void add(String code, int sequence) {
		if (this.rows.get(code) == null) {
			this.rows.put(code, new Row(code, sequence));
		}
	}

	public List getRows() {
		return new ArrayList<>(this.rows.values());
	}

	@Override
	public int getLength() {
		return 10 + (this.rows.size() * 11);
	}

	@Override
	public String toSeedString() throws SeedException {

		SeedStringBuilder builder = new SeedStringBuilder(this.getType(), 3).append("####");

		int number = rows.size();

		builder.append(number, 3);

		for (Row row : this.rows.values()) {
			builder.append(row.getCode(), 5);
			builder.leftPad(row.getSequence(), 6, '0');
		}

		builder.replace(3, 7, builder.length(), "####");
		return builder.toString();
	}

	public class Row {
		private String code;
		private int sequence;

		public Row(String code, int sequence) {
			this.code = code;
			this.sequence = sequence;
		}

		public String getCode() {
			return code;
		}

		public int getSequence() {
			return sequence;
		}

		public void updateSequence(int sequence) {
			this.sequence = sequence;
		}
	}

}