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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2017 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * 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.wildfly.common.iteration;

import static org.wildfly.common._private.CommonMessages.msg;

import java.util.NoSuchElementException;

/**
 */
final class Base16DecodingByteIterator extends ByteIterator {
    private final CodePointIterator iter;
    private int b;
    private long offset;
    private boolean havePair;

    Base16DecodingByteIterator(final CodePointIterator iter) {
        this.iter = iter;
    }

    private int calc(final int b0, final int b1) {
        int d0 = Character.digit(b0, 16);
        int d1 = Character.digit(b1, 16);
        if (d0 == - 1 || d1 == - 1) throw msg.invalidHexCharacter();
        return ((d0 << 4) | d1) & 0xff;
    }

    public boolean hasNext() {
        if (havePair) {
            return true;
        }
        if (! iter.hasNext()) {
            return false;
        }
        int b0 = iter.next();
        if (! iter.hasNext()) {
            throw msg.expectedEvenNumberOfHexCharacters();
        }
        int b1 = iter.next();
        b = calc(b0, b1);
        havePair = true;
        return true;
    }

    public boolean hasPrevious() {
        return offset > 0;
    }

    public int next() throws NoSuchElementException {
        if (! hasNext()) {
            throw new NoSuchElementException();
        }
        offset++;
        havePair = false;
        return b;
    }

    public int peekNext() throws NoSuchElementException {
        if (! hasNext()) {
            throw new NoSuchElementException();
        }
        return b;
    }

    public int previous() throws NoSuchElementException {
        if (! hasPrevious()) {
            throw new NoSuchElementException();
        }
        int b1 = iter.previous();
        int b0 = iter.previous();
        b = calc(b0, b1);
        offset--;
        havePair = true;
        return b;
    }

    public int peekPrevious() throws NoSuchElementException {
        if (! hasPrevious()) {
            throw new NoSuchElementException();
        }
        int b1 = iter.previous();
        int b0 = iter.peekPrevious();
        iter.next();
        return calc(b0, b1);
    }

    public long getIndex() {
        return offset;
    }
}