core/api/src/main/java/org/apache/zest/api/query/grammar/ExpressionSpecification.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.zest.api.query.grammar;

import org.apache.zest.api.composite.Composite;
import org.apache.zest.functional.Specification;

import static org.apache.zest.functional.Iterables.append;
import static org.apache.zest.functional.Iterables.iterable;

/**
 * Base expression Specification.
 */
public abstract class ExpressionSpecification
    implements Specification<Composite>
{

    @SuppressWarnings( "unchecked" )
    public AndSpecification and( Specification<Composite> specification )
    {
        if( this instanceof AndSpecification )
        {
            return new AndSpecification( append( specification, ( (AndSpecification) this ).operands() ) );
        }
        else
        {
            return new AndSpecification( iterable( this, specification ) );
        }
    }

    @SuppressWarnings( "unchecked" )
    public OrSpecification or( Specification<Composite> specification )
    {
        if( this instanceof OrSpecification )
        {
            return new OrSpecification( append( specification, ( (OrSpecification) this ).operands() ) );
        }
        else
        {
            return new OrSpecification( iterable( this, specification ) );
        }
    }

}