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/*
 * Copyright (c) 2008-2024, Hazelcast, Inc. All Rights Reserved.
 *
 * 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 com.hazelcast.internal.serialization.impl.compact;

import com.hazelcast.nio.serialization.FieldKind;

import javax.annotation.Nonnull;

/**
 * Descriptor that carries the information for the fields
 * of the schema. It can be used for any kind of field, whether
 * they are fixed-size or variable-size.
 */
public class FieldDescriptor {

    private final String fieldName;
    private final FieldKind fieldKind;
    private int index = -1;
    private int offset = -1;
    private byte bitOffset = -1;

    public FieldDescriptor(@Nonnull String fieldName, @Nonnull FieldKind fieldKind) {
        this.fieldName = fieldName;
        this.fieldKind = fieldKind;
    }

    public void setIndex(int index) {
        this.index = index;
    }

    public void setOffset(int offset) {
        this.offset = offset;
    }

    public void setBitOffset(byte bitOffset) {
        this.bitOffset = bitOffset;
    }

    public FieldKind getKind() {
        return fieldKind;
    }

    public String getFieldName() {
        return fieldName;
    }

    /**
     * @return the index of offset of the non-primitive field. if field is primitive returns -1
     */
    public int getIndex() {
        return index;
    }

    /**
     * @return the offset to read  the primitive field from. If field is not primitive returns -1
     */
    public int getOffset() {
        return offset;
    }

    /**
     * Applicable only for boolean field
     *
     * @return the offset of the boolean within the given byte via `offset`
     */
    public byte getBitOffset() {
        return bitOffset;
    }

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

        FieldDescriptor that = (FieldDescriptor) o;

        if (!fieldName.equals(that.fieldName)) {
            return false;
        }
        return fieldKind == that.fieldKind;
    }

    @Override
    public int hashCode() {
        int result = fieldName.hashCode();
        result = 31 * result + fieldKind.hashCode();
        return result;
    }

    @Override
    public String toString() {
        return "FieldDescriptor{"
                + "name='" + fieldName + '\''
                + ", kind=" + fieldKind
                + ", index=" + index
                + ", offset=" + offset
                + ", bitOffset=" + bitOffset
                + '}';
    }
}