/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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 org.apache.hyracks.storage.am.common;

@SuppressWarnings({"rawtypes", "unchecked"})
public class CheckTuple<T extends Comparable<T>> implements Comparable<T> {
    protected final int numKeys;
    protected final Comparable[] fields;
    protected int pos;
    protected boolean isHighKey;

    public CheckTuple(int numFields, int numKeys) {
        this.numKeys = numKeys;
        this.fields = new Comparable[numFields];
        pos = 0;
        isHighKey = false;
    }

    public void appendField(T e) {
        fields[pos++] = e;
    }

    @Override
    public int compareTo(T o) {
        CheckTuple<T> other = (CheckTuple<T>) o;
        int cmpFieldCount = Math.min(other.getNumKeys(), numKeys);
        for (int i = 0; i < cmpFieldCount; i++) {
            int cmp = fields[i].compareTo(other.getField(i));
            if (cmp != 0) {
                return cmp;
            }
        }
        if (other.getNumKeys() == numKeys) {
            return 0;
        }
        if (other.getNumKeys() < numKeys) {
            return (other.isHighKey) ? -1 : 1;
        }
        if (other.getNumKeys() > numKeys) {
            return (isHighKey) ? 1 : -1;
        }
        return 0;
    }

    @Override
    public boolean equals(Object o) {
        if (!(o instanceof Comparable<?>)) {
            return false;
        }
        return compareTo((T) o) == 0;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        for (int i = 0; i < numKeys; i++) {
            hash = 37 * hash + fields[i].hashCode();
        }
        return hash;
    }

    public void setIsHighKey(boolean isHighKey) {
        this.isHighKey = isHighKey;
    }

    public T getField(int idx) {
        return (T) fields[idx];
    }

    public void setField(int idx, T e) {
        fields[idx] = e;
    }

    public int size() {
        return fields.length;
    }

    public int getNumKeys() {
        return numKeys;
    }

    @Override
    public String toString() {
        StringBuilder strBuilder = new StringBuilder();
        for (int i = 0; i < fields.length; i++) {
            strBuilder.append(fields[i].toString());
            if (i != fields.length-1) {
                strBuilder.append(" ");
            }
        }
        return strBuilder.toString();
    }
}
