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core module for querydsl

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/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 * 
 * 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.mysema.query.alias;

import java.math.BigDecimal;
import java.math.BigInteger;
import java.sql.Time;
import java.sql.Timestamp;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;

import javax.annotation.Nullable;

import com.google.common.base.CaseFormat;
import com.mysema.query.types.EntityPath;
import com.mysema.query.types.Expression;
import com.mysema.query.types.Path;
import com.mysema.query.types.PathMetadataFactory;
import com.mysema.query.types.expr.SimpleExpression;
import com.mysema.query.types.path.ArrayPath;
import com.mysema.query.types.path.BooleanPath;
import com.mysema.query.types.path.CollectionPath;
import com.mysema.query.types.path.ComparablePath;
import com.mysema.query.types.path.DatePath;
import com.mysema.query.types.path.DateTimePath;
import com.mysema.query.types.path.EntityPathBase;
import com.mysema.query.types.path.EnumPath;
import com.mysema.query.types.path.ListPath;
import com.mysema.query.types.path.MapPath;
import com.mysema.query.types.path.NumberPath;
import com.mysema.query.types.path.PathBuilder;
import com.mysema.query.types.path.SetPath;
import com.mysema.query.types.path.SimplePath;
import com.mysema.query.types.path.StringPath;
import com.mysema.query.types.path.TimePath;

/**
 * Alias provides alias factory methods
 *
 * @author tiwe
 */
@SuppressWarnings("PMD")
public final class Alias {

    private static final AliasFactory aliasFactory = new AliasFactory(new DefaultPathFactory(), new DefaultTypeSystem());

    private static final SimplePath it = new SimplePath(Object.class, PathMetadataFactory.forVariable("it"));

    // exclude $-methods from Checkstyle checks
    //CHECKSTYLE:OFF
    /**
     * Convert the given alias to an expression
     *
     * @param 
     * @return
     */
    public static > D $() {
        return aliasFactory.getCurrentAndReset();
    }

    public static  ArrayPath $(D[] arg) {
        return aliasFactory.> getCurrentAndReset();
    }

    public static NumberPath $(BigDecimal arg) {
        return aliasFactory.> getCurrentAndReset();
    }

    public static NumberPath $(BigInteger arg) {
        return aliasFactory.> getCurrentAndReset();
    }

    public static BooleanPath $(Boolean arg) {
        return aliasFactory. getCurrentAndReset();
    }

    public static NumberPath $(Byte arg) {
        return aliasFactory.> getCurrentAndReset();
    }
    
    public static > EnumPath $(T arg) {
        return aliasFactory.> getCurrentAndReset();
    }

    public static  CollectionPath> $(Collection args) {
        return aliasFactory.>> getCurrentAndReset();
    }

    public static > ComparablePath $(D arg) {
//        return aliasFactory.> getCurrentAndReset();
        return Alias.>getPath(arg);
    }

    public static NumberPath $(Double arg) {
        return aliasFactory.> getCurrentAndReset();
    }

    public static NumberPath $(Float arg) {
        return aliasFactory.> getCurrentAndReset();
    }

    public static NumberPath $(Integer arg) {
        return aliasFactory.> getCurrentAndReset();
    }

    public static DatePath $(java.sql.Date arg) {
        return aliasFactory.> getCurrentAndReset();
    }

    public static DateTimePath $(java.util.Date arg) {
        return aliasFactory.> getCurrentAndReset();
    }

    public static  ListPath> $(List args) {
        return aliasFactory.>> getCurrentAndReset();
    }

    public static NumberPath $(Long arg) {
        return aliasFactory.> getCurrentAndReset();
    }

    public static  MapPath> $(Map args) {
        return aliasFactory.>> getCurrentAndReset();
    }

    public static  SetPath> $(Set args) {
        return aliasFactory.>> getCurrentAndReset();
    }

    public static NumberPath $(Short arg) {
        return aliasFactory.> getCurrentAndReset();
    }

    public static StringPath $(String arg) {
        return aliasFactory. getCurrentAndReset();
    }

    public static TimePath