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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging 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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/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project licenses this file to you 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 io.netty.handler.codec.http2;

import io.netty.util.internal.UnstableApi;

/**
 * Provides utility methods for accessing specific flags as defined by the HTTP/2 spec.
 */
@UnstableApi
public final class Http2Flags {
    public static final short END_STREAM = 0x1;
    public static final short END_HEADERS = 0x4;
    public static final short ACK = 0x1;
    public static final short PADDED = 0x8;
    public static final short PRIORITY = 0x20;

    private short value;

    public Http2Flags() {
    }

    public Http2Flags(short value) {
        this.value = value;
    }

    /**
     * Gets the underlying flags value.
     */
    public short value() {
        return value;
    }

    /**
     * Determines whether the {@link #END_STREAM} flag is set. Only applies to DATA and HEADERS
     * frames.
     */
    public boolean endOfStream() {
        return isFlagSet(END_STREAM);
    }

    /**
     * Determines whether the {@link #END_HEADERS} flag is set. Only applies for HEADERS,
     * PUSH_PROMISE, and CONTINUATION frames.
     */
    public boolean endOfHeaders() {
        return isFlagSet(END_HEADERS);
    }

    /**
     * Determines whether the flag is set indicating the presence of the exclusive, stream
     * dependency, and weight fields in a HEADERS frame.
     */
    public boolean priorityPresent() {
        return isFlagSet(PRIORITY);
    }

    /**
     * Determines whether the flag is set indicating that this frame is an ACK. Only applies for
     * SETTINGS and PING frames.
     */
    public boolean ack() {
        return isFlagSet(ACK);
    }

    /**
     * For frames that include padding, indicates if the {@link #PADDED} field is present. Only
     * applies to DATA, HEADERS, PUSH_PROMISE and CONTINUATION frames.
     */
    public boolean paddingPresent() {
        return isFlagSet(PADDED);
    }

    /**
     * Gets the number of bytes expected for the priority fields of the payload. This is determined
     * by the {@link #priorityPresent()} flag.
     */
    public int getNumPriorityBytes() {
        return priorityPresent() ? 5 : 0;
    }

    /**
     * Gets the length in bytes of the padding presence field expected in the payload. This is
     * determined by the {@link #paddingPresent()} flag.
     */
    public int getPaddingPresenceFieldLength() {
        return paddingPresent() ? 1 : 0;
    }

    /**
     * Sets the {@link #END_STREAM} flag.
     */
    public Http2Flags endOfStream(boolean endOfStream) {
        return setFlag(endOfStream, END_STREAM);
    }

    /**
     * Sets the {@link #END_HEADERS} flag.
     */
    public Http2Flags endOfHeaders(boolean endOfHeaders) {
        return setFlag(endOfHeaders, END_HEADERS);
    }

    /**
     * Sets the {@link #PRIORITY} flag.
     */
    public Http2Flags priorityPresent(boolean priorityPresent) {
        return setFlag(priorityPresent, PRIORITY);
    }

    /**
     * Sets the {@link #PADDED} flag.
     */
    public Http2Flags paddingPresent(boolean paddingPresent) {
        return setFlag(paddingPresent, PADDED);
    }

    /**
     * Sets the {@link #ACK} flag.
     */
    public Http2Flags ack(boolean ack) {
        return setFlag(ack, ACK);
    }

    /**
     * Generic method to set any flag.
     * @param on if the flag should be enabled or disabled.
     * @param mask the mask that identifies the bit for the flag.
     * @return this instance.
     */
    public Http2Flags setFlag(boolean on, short mask) {
        if (on) {
            value |= mask;
        } else {
            value &= ~mask;
        }
        return this;
    }

    /**
     * Indicates whether or not a particular flag is set.
     * @param mask the mask identifying the bit for the particular flag being tested
     * @return {@code true} if the flag is set
     */
    public boolean isFlagSet(short mask) {
        return (value & mask) != 0;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + value;
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }

        return value == ((Http2Flags) obj).value;
    }

    @Override
    public String toString() {
        StringBuilder builder = new StringBuilder();
        builder.append("value = ").append(value).append(" (");
        if (ack()) {
            builder.append("ACK,");
        }
        if (endOfHeaders()) {
            builder.append("END_OF_HEADERS,");
        }
        if (endOfStream()) {
            builder.append("END_OF_STREAM,");
        }
        if (priorityPresent()) {
            builder.append("PRIORITY_PRESENT,");
        }
        if (paddingPresent()) {
            builder.append("PADDING_PRESENT,");
        }
        builder.append(')');
        return builder.toString();
    }
}