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The coolest XML library for Java around. Define typesafe views (projections) to xml. Use XPath to read and write XML. Bind XML to Java collections. Requires at least Java6, supports Java8 features and has no further runtime dependencies.

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/**
 *  Copyright 2014 Sven Ewald
 *
 *  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.xmlbeam.util.intern;

import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

/**
 * @author sven
 */
public class Preprocessor {

    private final static Map PARAM_INDEX_MAP = new HashMap();

    static {
        for (int i = 0; i < 10; ++i) {
            PARAM_INDEX_MAP.put("ARG" + i, i);
            PARAM_INDEX_MAP.put("PARAM" + i, i);
            PARAM_INDEX_MAP.put(Integer.toString(i), i);
        }
    }

    /**
     * @param paramName
     * @return index of parameter or -1 if index could not determined
     */
    public static int getParameterIndex(final String paramName) {
        String uppercase = paramName.toUpperCase(Locale.ENGLISH);
        Integer index = PARAM_INDEX_MAP.get(uppercase);
        if (index != null) {
            return index.intValue();
        }
        String number = paramName.replaceFirst("PARAM|ARG", "");
        if (number.matches("[0-9]+")) {
            return Integer.parseInt(number);
        }
        return -1;
    }

    /**
     * @param string
     * @param paramNameIndexMap
     * @param args
     * @return a string with all place holders filled by given parameters
     */
    public static String applyParams(final String string, final Map paramNameIndexMap, final Object[] args) {
        if ((string == null) || (string.length() == 0)) {
            return string;
        }
        final StringBuilder applied = new StringBuilder(), paramNameBuilder = new StringBuilder();
        char a, b;
        boolean inVarname = false;
        for (int i = 0; i <= (string.length() - 1); ++i) {
            a = string.charAt(i);
            b = i < (string.length() - 1) ? string.charAt(i + 1) : 'X';
            if ((a == '{') && (b == '{')) {
                applied.append('{');
                ++i;
                continue;
            }
            if ((a == '}') && (b == '}')) {
                applied.append('}');
                ++i;
                continue;
            }
            if (a != '{') {
                applied.append(a);
                continue;
            }
            inVarname = true;
            while ((i < (string.length() - 2)) && (b != '}')) {
                paramNameBuilder.append(b);
                i++;
                b = string.charAt(i + 1);
            }
            inVarname = b != '}';
            ++i;
            applied.append(resolveParameter(paramNameBuilder.toString(), paramNameIndexMap, args));
            paramNameBuilder.delete(0, paramNameBuilder.length());
        }

        if (inVarname) {
            throw new IllegalArgumentException("Unmatched '{'");
        }
        return applied.toString();
    }

    private static String resolveParameter(final String paramName, final Map paramNameIndexMap, final Object[] args) {
        if (paramNameIndexMap != null) {
            Integer index = paramNameIndexMap.get(paramName);
            if (index != null) {
                return args[index.intValue()].toString();
            }
        }
        int index = getParameterIndex(paramName);
        if (index >= 0) {
            return args[index].toString();
        }
        throw new IllegalArgumentException("Can not find argument for parameter '" + paramName + "'");
    }
}