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/*
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 *
 * Copyright (c) 2013-2014 Oracle and/or its affiliates. All rights reserved.
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 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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 *
 * GPL Classpath Exception:
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 *
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package org.glassfish.jersey.server.internal.monitoring;

import java.util.Collections;
import java.util.Map;

import org.glassfish.jersey.server.monitoring.ExceptionMapperStatistics;

import jersey.repackaged.com.google.common.collect.Maps;

/**
 * Exception mapper statistics.
 *
 * @author Miroslav Fuksa (miroslav.fuksa at oracle.com)
 */
class ExceptionMapperStatisticsImpl implements ExceptionMapperStatistics {

    /**
     * Builder of exception mapper statistics.
     */
    static class Builder {
        private Map, Long> exceptionMapperExecutionCount = Maps.newHashMap();
        private long successfulMappings;
        private long unsuccessfulMappings;
        private long totalMappings;

        /**
         * Add mappings.
         * @param success True if mappings were successful.
         * @param count Number of mappings.
         */
        void addMapping(boolean success, int count) {
            totalMappings++;
            if (success) {
                successfulMappings += count;
            } else {
                unsuccessfulMappings += count;
            }
        }

        /**
         * Add an execution of exception mapper.
         * @param mapper Exception mapper.
         * @param count Number of executions of the {@code mapper}.
         */
        void addExceptionMapperExecution(Class mapper, int count) {
            Long cnt = exceptionMapperExecutionCount.get(mapper);
            cnt = cnt == null ? count : cnt + count;
            exceptionMapperExecutionCount.put(mapper, cnt);
        }


        /**
         * Build an instance of exception mapper statistics.
         *
         * @return New instance of exception mapper statistics.
         */
        public ExceptionMapperStatisticsImpl build() {
            return new ExceptionMapperStatisticsImpl(Collections.unmodifiableMap(exceptionMapperExecutionCount),
                    successfulMappings, unsuccessfulMappings, totalMappings);
        }
    }


    private final Map, Long> exceptionMapperExecutionCount;
    private final long successfulMappings;
    private final long unsuccessfulMappings;
    private final long totalMappings;


    private ExceptionMapperStatisticsImpl(Map, Long> exceptionMapperExecutionCount,
                                         long successfulMappings, long unsuccessfulMappings, long totalMappings) {
        this.exceptionMapperExecutionCount = exceptionMapperExecutionCount;
        this.successfulMappings = successfulMappings;
        this.unsuccessfulMappings = unsuccessfulMappings;
        this.totalMappings = totalMappings;
    }


    @Override
    public Map, Long> getExceptionMapperExecutions() {
        return exceptionMapperExecutionCount;
    }

    @Override
    public long getSuccessfulMappings() {
        return successfulMappings;
    }

    @Override
    public long getUnsuccessfulMappings() {
        return unsuccessfulMappings;
    }

    @Override
    public long getTotalMappings() {
        return totalMappings;
    }

    @Override
    public ExceptionMapperStatistics snapshot() {
        // snapshot functionality not yet implemented
        return this;
    }


}