gradle-master/subprojects/persistent-cache/src/main/java/org/gradle/cache/internal/cacheops/CacheOperationStack.java
/*
 * Copyright 2011 the original author or authors.
 *
 * 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.gradle.cache.internal.cacheops;

class CacheOperationStack {
    private int operationCount;

    public boolean isInCacheAction() {
        return operationCount>0;
    }

    public CacheOperationStack pushCacheAction() {
        operationCount++;
        return this;
    }

    public void popCacheAction() {
        checkNotEmpty();
        operationCount--;
    }


    private void checkNotEmpty() {
        if (operationCount==0) {
            throw new IllegalStateException("Operation stack is empty.");
        }
    }

    public boolean isEmpty() {
        return operationCount==0;
    }
}
