ThisResolver.java

/*
 * Copyright 2013 Martin Kouba
 *
 * 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 org.trimou.engine.resolver;

import org.trimou.util.Strings;

/**
 * @author Martin Kouba
 */
public class ThisResolver extends AbstractResolver {

    public static final int THIS_RESOLVER_PRIORITY = Resolver.DEFAULT_PRIORITY;

    public static final String NAME_THIS = Strings.THIS;

    private final Hint hint;

    public ThisResolver() {
        this(THIS_RESOLVER_PRIORITY);
    }

    public ThisResolver(int priority) {
        super(priority);
        this.hint = (contextObject, name, context) -> contextObject;
    }

    @Override
    public Object resolve(Object contextObject, String name,
            ResolutionContext context) {
        if (contextObject == null) {
            return null;
        }
        if (NAME_THIS.equals(name) || Strings.DOT.equals(name)) {
            return contextObject;
        }
        return null;
    }

    @Override
    public Hint createHint(Object contextObject, String name, ResolutionContext context) {
        return hint;
    }

}