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/*
 * Copyright 2013 Bazaarvoice, Inc.
 *
 * 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.bazaarvoice.jolt.chainr.spec;

import com.bazaarvoice.jolt.exception.SpecException;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

/**
 * Helper class that encapsulates the Chainr spec's list.
 *
 * For reference : a Chainr spec should be an array of objects in order that look like this:
 *
 *  * [
 *     {
 *         "operation": "[operation-name]",
 *         // stuff that the specific transform needs go here
 *     },
 *     ...
 * ]
 * 
 *
 * This class represents the Array, while the ChainrEntry class encompass the individual elements
 * of the array.
 */
public class ChainrSpec {

    private final List chainrEntries;

    /**
     * @param chainrSpec Plain vanilla hydrated JSON representation of a Chainr spec .json file.
     */
    public ChainrSpec( Object chainrSpec ) {

        if ( !( chainrSpec instanceof List ) ) {
            throw new SpecException(  "JOLT Chainr expects a JSON array of objects - Malformed spec." );
        }

        @SuppressWarnings( "unchecked" ) // We know its a list due to the check above
        List