com.github.jknack.css.expression.AbstractExpression.java Source code

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Here is the source code for com.github.jknack.css.expression.AbstractExpression.java

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/**
 * Copyright (c) 2012-2013 Edgar Espina
 *
 * This file is part of css.java.
 *
 * 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.github.jknack.css.expression;

import static org.apache.commons.lang3.Validate.notNull;

import com.github.jknack.css.Expression;

public abstract class AbstractExpression implements Expression {

    @Override
    public <E extends Expression> E adapt(final Class<E> expressionType) {
        notNull(expressionType, "The expressionType is required.");
        if (expressionType.isInstance(this)) {
            return expressionType.cast(this);
        }
        return null;
    }

}