net.eusashead.spring.gaecache.ArgumentHash.java Source code

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Here is the source code for net.eusashead.spring.gaecache.ArgumentHash.java

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package net.eusashead.spring.gaecache;

/*
 * #[license]
 * spring-cache-gae
 * %%
 * Copyright (C) 2013 Eusa's Head
 * %%
 * 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.
 * %[license]
 */

import org.springframework.util.Assert;

public class ArgumentHash {

    public static final String NULL_HASH = "<null>";

    private final String raw;

    private final String hash;

    public ArgumentHash() {
        this.hash = NULL_HASH;
        this.raw = null;
    }

    public ArgumentHash(String raw) {
        this(raw, new Murmur3HashAlgorithm());
    }

    public ArgumentHash(String raw, HashAlgorithm strategy) {

        // Check parameters
        Assert.notNull(raw);
        Assert.notNull(strategy);

        // Create hash
        String hash = strategy.hash(raw);

        // Set variables
        this.raw = raw;
        this.hash = hash;
    }

    /**
     * The hash value
     * of this Hash
     * @return
     */
    public String rawValue() {
        return this.raw;
    }

    /**
     * The original 
     * pre-hashed value
     * @return
     */
    public String hashValue() {
        return this.hash;
    }

    @Override
    public String toString() {
        return this.hash;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((hash == null) ? 0 : hash.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        ArgumentHash other = (ArgumentHash) obj;
        if (hash == null) {
            if (other.hash != null)
                return false;
        } else if (!hash.equals(other.hash))
            return false;
        return true;
    }

}