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package org.apidesign.javap;

/**

 *

 * @author Jaroslav Tulach <jtulach@netbeans.org>

 */

public final class TrapDataIterator {

    private final java.util.Map<Short, TrapData> exStart = new java.util.HashMap<Short, TrapData>();

    private final java.util.Map<Short, TrapData> exStop = new java.util.HashMap<Short, TrapData>();

    private final java.util.Deque<TrapData> current = new java.util.ArrayDeque<TrapData>();

    TrapDataIterator(Vector exceptionTable) {

        for (int i=0 ; i < exceptionTable.size(); i++) {

            final TrapData td = (TrapData)exceptionTable.elementAt(i);

            exStart.put(td.start_pc, td);

            exStop.put(td.end_pc, td);

        }

    }

    public void advanceTo(int i) {

        TrapData e = exStart.get((short) i);

        if (e != null) {

            current.addFirst(e);

        }

        e = exStop.get((short) i);

        if (e != null) {

            current.remove(e);

        }

    }

    public boolean useTry() {

        return !current.isEmpty();

    }

    public TrapData[] current() {

        return current.toArray(new TrapData[0]);

    }

}