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/*
 * 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.compiler.compiler;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.drools.drl.ast.descr.ImportDescr;
import org.kie.internal.builder.KnowledgeBuilderResult;

/**
 * A Registry of DialectConfigurations. It is also responsible for issueing actions to all registered
 * dialects.
 * This Class api is subject to change.
 */
public class DialectCompiletimeRegistry {

    private final Map map = new HashMap<>();

    /**
     * Add a DialectConfiguration to the registry
     * @param name
     * @param dialect
     */
    public void addDialect(final String name,
                           final Dialect dialect) {
        this.map.put( name,
                      dialect );
    }

    /**
     * Get a DialectConfiguration for a named dialect
     * @param name
     * @return
     */
    public Dialect getDialect(final String name) {
        return this.map.get( name );
    }

    /**
     * Instruct all registered dialects to compile what ever they have attempted to build.
     */
    public void compileAll() {
        for (Dialect dialect : this.map.values()) {
            dialect.compileAll();
        }
    }

    /**
     * Return an Iterator of DialectConfigurations
     * @return
     */
    public Iterator iterator() {
        return this.map.values().iterator();
    }

    /**
     * Add all registered Dialect results to the provided List.
     * @param list
     * @return
     */
    public List addResults(List list) {
        if ( list == null ) {
            list = new ArrayList<>();
        }
        for (Dialect dialect : map.values()) {
            List results = dialect.getResults();
            if ( results != null ) {
                for (KnowledgeBuilderResult result : results) {
                    if (!list.contains(result)) {
                        list.add(result);
                    }
                }
                dialect.clearResults();
            }
        }
        return list;
    }

    /**
     * Iterates all registered dialects, informing them of an import added to the PackageBuilder
     * @param importEntry
     */
    public void addImport(ImportDescr importDescr) {
        for (Dialect dialect : this.map.values()) {
            dialect.addImport(importDescr);
        }
    }

    /**
     * Iterates all registered dialects, informing them of a static imports added to the PackageBuilder
     * @param staticImportEntry
     */
    public void addStaticImport(ImportDescr importDescr) {
        for (Dialect dialect : this.map.values()) {
            dialect.addStaticImport(importDescr);
        }
    }
    
}