arrays iterators
This commit is contained in:
Alex Tkachman
@@ -0,0 +1,274 @@
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package jet.arrays;
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import jet.Iterator;
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import jet.typeinfo.TypeInfo;
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import jet.typeinfo.TypeInfoProjection;
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import java.lang.reflect.GenericArrayType;
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import java.util.Arrays;
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/**
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* @author alex.tkachman
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*/
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public abstract class ArrayIterator<T> implements Iterator<T> {
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private final int size;
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protected int index;
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protected ArrayIterator(int size) {
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this.size = size;
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}
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@Override
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public boolean hasNext() {
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return index < size;
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}
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private static class GenericIterator<T> extends ArrayIterator<T> {
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private final T[] array;
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private final TypeInfo elementTypeInfo;
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private GenericIterator(T[] array, TypeInfo elementTypeInfo) {
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super(array.length);
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this.array = array;
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this.elementTypeInfo = elementTypeInfo;
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}
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@Override
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public T next() {
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return array[index++];
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}
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@Override
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public TypeInfo<?> getTypeInfo() {
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return TypeInfo.getTypeInfo(GenericIterator.class, false, null, new TypeInfoProjection[] {(TypeInfoProjection) elementTypeInfo});
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}
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}
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public static <T> Iterator<T> iterator(T[] array, TypeInfo elementTypeInfo) {
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return new GenericIterator<T>(array, elementTypeInfo);
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}
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private static class ByteIterator extends ArrayIterator<Byte> {
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private final byte[] array;
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private static final TypeInfo typeInfo = TypeInfo.getTypeInfo(ByteIterator.class, false);
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private ByteIterator(byte[] array) {
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super(array.length);
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this.array = array;
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}
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@Override
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public Byte next() {
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return array[index++];
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}
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@Override
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public TypeInfo<?> getTypeInfo() {
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return typeInfo;
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}
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}
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public static Iterator<Byte> iterator(byte[] array) {
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return new ByteIterator(array);
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}
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private static class ShortIterator extends ArrayIterator<Short> {
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private final short[] array;
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private static final TypeInfo typeInfo = TypeInfo.getTypeInfo(ShortIterator.class, false);
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private ShortIterator(short[] array) {
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super(array.length);
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this.array = array;
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}
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@Override
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public Short next() {
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return array[index++];
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}
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@Override
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public TypeInfo<?> getTypeInfo() {
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return typeInfo;
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}
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}
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public static Iterator<Short> iterator(short[] array) {
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return new ShortIterator(array);
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}
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private static class IntegerIterator extends ArrayIterator<Integer> {
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private final int[] array;
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private static final TypeInfo typeInfo = TypeInfo.getTypeInfo(IntegerIterator.class, false);
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private IntegerIterator(int[] array) {
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super(array.length);
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this.array = array;
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}
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@Override
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public Integer next() {
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return array[index++];
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}
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@Override
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public TypeInfo<?> getTypeInfo() {
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return typeInfo;
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}
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}
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public static Iterator<Integer> iterator(int[] array) {
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return new IntegerIterator(array);
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}
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private static class LongIterator extends ArrayIterator<Long> {
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private final long[] array;
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private static final TypeInfo typeInfo = TypeInfo.getTypeInfo(LongIterator.class, false);
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private LongIterator(long[] array) {
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super(array.length);
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this.array = array;
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}
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@Override
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public Long next() {
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return array[index++];
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}
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@Override
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public TypeInfo<?> getTypeInfo() {
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return typeInfo;
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}
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}
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public static Iterator<Long> iterator(long[] array) {
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return new LongIterator(array);
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}
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private static class FloatIterator extends ArrayIterator<Float> {
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private final float[] array;
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private static final TypeInfo typeInfo = TypeInfo.getTypeInfo(FloatIterator.class, false);
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private FloatIterator(float[] array) {
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super(array.length);
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this.array = array;
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}
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@Override
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public Float next() {
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return array[index++];
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}
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@Override
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public TypeInfo<?> getTypeInfo() {
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return typeInfo;
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}
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}
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public static Iterator<Float> iterator(float[] array) {
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return new FloatIterator(array);
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}
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private static class DoubleIterator extends ArrayIterator<Double> {
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private final double[] array;
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private static final TypeInfo typeInfo = TypeInfo.getTypeInfo(DoubleIterator.class, false);
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private DoubleIterator(double[] array) {
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super(array.length);
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this.array = array;
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}
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@Override
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public Double next() {
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return array[index++];
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}
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@Override
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public TypeInfo<?> getTypeInfo() {
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return typeInfo;
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}
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}
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public static Iterator<Double> iterator(double[] array) {
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return new DoubleIterator(array);
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}
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private static class CharacterIterator extends ArrayIterator<Character> {
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private final char[] array;
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private static final TypeInfo typeInfo = TypeInfo.getTypeInfo(CharacterIterator.class, false);
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private CharacterIterator(char[] array) {
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super(array.length);
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this.array = array;
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}
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@Override
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public Character next() {
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return array[index++];
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}
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@Override
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public TypeInfo<?> getTypeInfo() {
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return typeInfo;
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}
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}
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public static Iterator<Character> iterator(char[] array) {
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return new CharacterIterator(array);
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}
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private static class BooleanIterator extends ArrayIterator<Boolean> {
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private final boolean[] array;
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private static final TypeInfo typeInfo = TypeInfo.getTypeInfo(BooleanIterator.class, false);
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private BooleanIterator(boolean[] array) {
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super(array.length);
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this.array = array;
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}
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@Override
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public Boolean next() {
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return array[index++];
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}
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@Override
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public TypeInfo<?> getTypeInfo() {
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return typeInfo;
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}
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}
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public static Iterator<Boolean> iterator(boolean[] array) {
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return new BooleanIterator(array);
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}
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public static void main(String[] args) {
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String[] strings = {"Byte", "byte", "Short", "short", "Integer", "int", "Long", "long", "Float", "float", "Double", "double", "Character", "char", "Boolean", "boolean"};
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for(int i = 0; i != strings.length; i += 2) {
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String boxed = strings[i];
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String unboxed = strings[i+1];
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System.out.println(" private static class " + boxed + "Iterator extends ArrayIterator<" + boxed + "> {\n" +
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" private final " + unboxed + "[] array;\n" +
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" private static final TypeInfo typeInfo = TypeInfo.getTypeInfo(" + boxed + "Iterator.class, false);\n" +
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"\n" +
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" private " + boxed + "Iterator(" + unboxed + "[] array) {\n" +
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" super(array.length);\n" +
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" this.array = array;\n" +
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" }\n" +
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"\n" +
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" @Override\n" +
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" public " + boxed + " next() {\n" +
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" return array[index++];\n" +
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" }\n" +
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"\n" +
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" @Override\n" +
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" public TypeInfo<?> getTypeInfo() {\n" +
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" return typeInfo;\n" +
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" }\n" +
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" }\n" +
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"\n" +
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" public static Iterator<" + boxed + "> iterator(" + unboxed + "[] array) {\n" +
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" return new " + boxed + "Iterator(array);\n" +
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" }\n" +
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"");
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}
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}
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}
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