/*
 * Copyright 2015 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * 
 *      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.drools.core.time.impl;

import org.drools.core.reteoo.RuleTerminalNode;
import org.drools.core.rule.ConditionalElement;
import org.drools.core.rule.Declaration;
import org.drools.core.rule.RuleConditionElement;

import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.Map;


public abstract class BaseTimer extends ConditionalElement{

    public Map<String, Declaration> getInnerDeclarations() {
        return Collections.EMPTY_MAP;
    }

    public Map<String, Declaration> getOuterDeclarations() {
        return Collections.EMPTY_MAP;
    }

    /**
     * @inheritDoc
     */
    public Declaration resolveDeclaration(final String identifier) {
        return null;
    }

    public List<? extends RuleConditionElement> getNestedElements() {
        return Collections.EMPTY_LIST;
    }

    public boolean isPatternScopeDelimiter() {
        return true;
    }

    public abstract Declaration[][] getTimerDeclarations(Map<String, Declaration> outerDeclrs);

    protected Declaration[] sortDeclarations(Map<String, Declaration> outerDeclrs, Declaration[] declrs) {
        if (declrs == null) {
            return null;
        }
        Declaration[] sortedDeclrs = Arrays.copyOf(declrs, declrs.length); // make copies as originals must not be changed
        for ( int i = 0; i < sortedDeclrs.length; i++  ) {
            sortedDeclrs[i] = outerDeclrs.get( sortedDeclrs[i].getIdentifier() );
        }
        Arrays.sort(sortedDeclrs, RuleTerminalNode.SortDeclarations.instance);
        return sortedDeclrs;
    }
}