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/**
 * Copyright (C) 2012 - 101loops.com 
 *
 * 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.crashnote.external.config.impl;

/** The key used to memoize already-traversed nodes when resolving substitutions */
final class MemoKey {
    MemoKey(final AbstractConfigValue value, final Path restrictToChildOrNull) {
        this.value = value;
        this.restrictToChildOrNull = restrictToChildOrNull;
    }

    final private AbstractConfigValue value;
    final private Path restrictToChildOrNull;

    @Override
    public final int hashCode() {
        final int h = System.identityHashCode(value);
        if (restrictToChildOrNull != null) {
            return h + 41 * (41 + restrictToChildOrNull.hashCode());
        } else {
            return h;
        }
    }

    @Override
    public final boolean equals(final Object other) {
        if (other instanceof MemoKey) {
            final MemoKey o = (MemoKey) other;
            if (o.value != this.value)
                return false;
            else if (o.restrictToChildOrNull == this.restrictToChildOrNull)
                return true;
            else if (o.restrictToChildOrNull == null || this.restrictToChildOrNull == null)
                return false;
            else
                return o.restrictToChildOrNull.equals(this.restrictToChildOrNull);
        } else {
            return false;
        }
    }
}