com.ibm.watson.catalyst.jumpqa.replacer.ConstReplacer.java Source code

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/*******************************************************************************
 * Copyright 2015 IBM Corporation
 *
 * 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.ibm.watson.catalyst.jumpqa.replacer;

import java.util.Objects;
import java.util.regex.Pattern;

import org.apache.commons.lang3.builder.HashCodeBuilder;

/**
 * A class which takes strings and makes a set replacement.
 * 
 * @author Will Beason
 * @version 0.1.1
 * @since 0.1.0
 *
 */
public class ConstReplacer implements IReplacer {

    /**
     * Instantiates a new Replacer
     * 
     * @param aPattern the pattern to search for
     * @param aReplacement what to replace the pattern with
     */
    public ConstReplacer(Pattern aPattern, String aReplacement) {
        _pattern = aPattern;
        _replacement = aReplacement;
    }

    /**
     * Instantiates a new Replacer with the pattern as a string
     * 
     * @param aPattern the pattern to search for
     * @param aReplacement what to replace the pattern with
     */
    public ConstReplacer(String aPattern, String aReplacement) {
        this(Pattern.compile(aPattern), aReplacement);
    }

    /**
     * Takes a string and
     * 
     * @param aString the string to match and make replacements
     * @return the string with replacements made
     */
    public String replace(String aString) {
        return _pattern.matcher(aString).replaceAll(_replacement);
    }

    @Override
    public String replace(String aString, String... args) {
        return replace(aString);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null || getClass() != obj.getClass())
            return false;
        ConstReplacer other = (ConstReplacer) obj;
        if (!Objects.equals(other._replacement, this._replacement))
            return false;
        if (!Objects.equals(other._pattern.toString(), this._pattern.toString()))
            return false;
        if (!Objects.equals(other._pattern.flags(), this._pattern.flags()))
            return false;
        return true;
    }

    @Override
    public int hashCode() {
        return (new HashCodeBuilder(SEED, MULTIPLY)).append(_replacement).append(_pattern.toString())
                .append(_pattern.flags()).hashCode();
    }

    private final Pattern _pattern;
    private final String _replacement;

    private static final int SEED = 465630923;
    private static final int MULTIPLY = 730394177;

    @Override
    public int numArgs() {
        return 0;
    }

}