ModCollection.java

package ru.kpfu.itis.barakhov.units;

import java.util.AbstractCollection;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;

public class ModCollection<T> extends AbstractCollection<T> {

    private static final String ERROR_MESSAGE = "error message";
    private final int CAPACITY = 1000;
    private final T[] data;
    private int size;
    private final ModIterator<T> modIter;

    public ModCollection() {
        this.size = 0;
        data = (T[]) new Object[CAPACITY];
        modIter = new ModIterator<T>(data, size);
    }

    public ModCollection(Collection<? extends T> incol) throws IllegalArgumentException{
        if (incol.size() > CAPACITY) throw new IllegalArgumentException(ERROR_MESSAGE);
        this.size = 0;
        data = (T[]) new Object[incol.size()];
        for (T el : incol) {
            data[size] = el;
            size++;
        }
        modIter = new ModIterator<T>(data, size);
    }

    @Override
    public Iterator<T> iterator() {
        return modIter;
    }

    public void print() {
        for (T el : data) {
            System.out.println(el);
        }
    }

    @Override
    public int size() {
        return size;
    }

    public boolean add(T el) {
        try {
            el = data[++size];
            return true;
        } catch (ArrayIndexOutOfBoundsException ex) {
            return false;
        }
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + Arrays.hashCode(data);
        result = prime * result + size;
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        ModCollection<?> other = (ModCollection<?>) obj;
        if (!Arrays.equals(data, other.data))
            return false;
        return size == other.size;
    }
    @Override
    public String toString() {
        return "ModCollection { " +
                "CAPACITY = " + CAPACITY +
                ", data = " + Arrays.toString(data) +
                ", size = " + size +
                ", modIter = " + modIter.toString() +
                " }";
    }
}