com.seanchenxi.gwt.uri.template.EncodeRule.java Source code

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Here is the source code for com.seanchenxi.gwt.uri.template.EncodeRule.java

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/*
 * Copyright 2015 Xi CHEN
 *
 * 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.seanchenxi.gwt.uri.template;

import com.google.gwt.http.client.URL;

import java.util.Arrays;
import java.util.Collections;
import java.util.LinkedHashSet;
import java.util.Set;

/**
 * <p>
 * Expression encode rule.
 * </p>
 *
 * @author Xi CHEN
 * @since 13/12/15.
 * @see <a href="http://tools.ietf.org/html/rfc6570#appendix-A">Implementation Hints | RFC 6570</a>
 */
public enum EncodeRule {
    /**
     * means any character not in the unreserved set will be encoded
     */
    U {
        @Override
        public String encode(String input) {
            return doEncode(input, false);
        }
    },

    /**
     * means any character not in the union of (unreserved / reserved / pct-encoding) will be encoded
     */
    U_R {
        @Override
        public String encode(String input) {
            return doEncode(input, true);
        }
    };

    private static final int CASE_DIFF = ('a' - 'A');
    /**
     * a-z && A-Z && 0-9 && -._~
     */
    private static final Set<Character> UNRESERVED;
    /**
     * :/?#[]@!$&'()*+,;=
     */
    private static final Set<Character> RESERVED;

    static {
        Set<Character> set = new LinkedHashSet<Character>();
        char i;
        for (i = 'a'; i <= 'z'; i++) {
            set.add(i);
        }
        for (i = 'A'; i <= 'Z'; i++) {
            set.add(i);
        }
        for (i = '0'; i <= '9'; i++) {
            set.add(i);
        }
        set.addAll(Arrays.asList('-', '.', '_', '~'));
        UNRESERVED = Collections.unmodifiableSet(set);
        RESERVED = Collections.unmodifiableSet(new LinkedHashSet<Character>(Arrays.asList(':', '/', '?', '#', '[',
                ']', '@', '!', '$', '&', '\'', '(', ')', '*', '+', ',', ';', '=')));
    }

    EncodeRule() {
    }

    public abstract String encode(String input);

    protected String doEncode(String input, boolean passReserved) {
        return passReserved ? URL.encodeQueryString(input).replace("!", "%21") : URL.encode(input);
    }

}