StringReplacementAlgo.java

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package com.sun.enterprise.admin.servermgmt.stringsubs.impl.algorithm;

import java.io.IOException;
import java.io.Reader;
import java.io.Writer;
import java.util.Map;

import com.sun.enterprise.admin.servermgmt.stringsubs.StringSubstitutionException;
import com.sun.enterprise.admin.servermgmt.stringsubs.Substitutable;
import com.sun.enterprise.admin.servermgmt.stringsubs.SubstitutionAlgorithm;

/**
 * Perform's String substitution by replacing the matching target
 * sequence with the specified literal replacement sequence.
 */
public class StringReplacementAlgo implements SubstitutionAlgorithm {

    private Map<String, String> _substitutionMap;

    /**
     * Construct {@link StringReplacementAlgo} for the given substitutable key/value
     * pair.
     *
     * @param substitutionMap Map of substitutable key/value pairs.
     */
    public StringReplacementAlgo(Map<String, String> substitutionMap) {
        if (substitutionMap == null || substitutionMap.isEmpty()) {
            throw new IllegalArgumentException("Can not construct algorithm for null or empty map.");
        }
        _substitutionMap = substitutionMap;
    }

    @Override
    public void substitute(Substitutable resolver)
            throws StringSubstitutionException {
        Reader reader = resolver.getReader();
        Writer writer = resolver.getWriter();
        try {
            String inputLine = null;
            char[] cbuffer = new char[8192];
            int count = 0;
            while ((count = reader.read(cbuffer)) > 0) {
                inputLine = new String(cbuffer, 0, count);
                for(String key : _substitutionMap.keySet()) {
                    inputLine = inputLine.replace(key, _substitutionMap.get(key));
                }
                writer.write(inputLine);
            }
            writer.flush();
        } catch (IOException e) {
            throw new StringSubstitutionException("Error occurred while performing the String substitution", e);
        }
    }
}