org.springframework.web.reactive.result.condition.AbstractMediaTypeExpression.java Source code

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Here is the source code for org.springframework.web.reactive.result.condition.AbstractMediaTypeExpression.java

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/*
 * Copyright 2002-2016 the original author or authors.
 *
 * 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.springframework.web.reactive.result.condition;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.server.NotAcceptableStatusException;
import org.springframework.web.server.ServerWebExchange;
import org.springframework.web.server.UnsupportedMediaTypeStatusException;

/**
 * Supports media type expressions as described in:
 * {@link RequestMapping#consumes()} and {@link RequestMapping#produces()}.
 *
 * @author Rossen Stoyanchev
 * @since 5.0
 */
abstract class AbstractMediaTypeExpression implements Comparable<AbstractMediaTypeExpression>, MediaTypeExpression {

    protected final Log logger = LogFactory.getLog(getClass());

    private final MediaType mediaType;

    private final boolean isNegated;

    AbstractMediaTypeExpression(String expression) {
        if (expression.startsWith("!")) {
            this.isNegated = true;
            expression = expression.substring(1);
        } else {
            this.isNegated = false;
        }
        this.mediaType = MediaType.parseMediaType(expression);
    }

    AbstractMediaTypeExpression(MediaType mediaType, boolean negated) {
        this.mediaType = mediaType;
        this.isNegated = negated;
    }

    @Override
    public MediaType getMediaType() {
        return this.mediaType;
    }

    @Override
    public boolean isNegated() {
        return this.isNegated;
    }

    public final boolean match(ServerWebExchange exchange) {
        try {
            boolean match = matchMediaType(exchange);
            return (!this.isNegated == match);
        } catch (NotAcceptableStatusException ex) {
            return false;
        } catch (UnsupportedMediaTypeStatusException ex) {
            return false;
        }
    }

    protected abstract boolean matchMediaType(ServerWebExchange exchange)
            throws NotAcceptableStatusException, UnsupportedMediaTypeStatusException;

    @Override
    public int compareTo(AbstractMediaTypeExpression other) {
        return MediaType.SPECIFICITY_COMPARATOR.compare(this.getMediaType(), other.getMediaType());
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj != null && getClass() == obj.getClass()) {
            AbstractMediaTypeExpression other = (AbstractMediaTypeExpression) obj;
            return (this.mediaType.equals(other.mediaType) && this.isNegated == other.isNegated);
        }
        return false;
    }

    @Override
    public int hashCode() {
        return this.mediaType.hashCode();
    }

    @Override
    public String toString() {
        StringBuilder builder = new StringBuilder();
        if (this.isNegated) {
            builder.append('!');
        }
        builder.append(this.mediaType.toString());
        return builder.toString();
    }

}