StringUtils.java

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 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.wink.common.internal.utils;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

/**
 *
 */
public class StringUtils {

    public final static String lineSeparator = System.getProperty("line.separator"); //$NON-NLS-1$

    private StringUtils() {
        // this class should never be created
    }

    public static String valueOf(Map<?, ?> map) {
        if (map == null) {
            return "null"; //$NON-NLS-1$
        }
        StringBuilder builder = new StringBuilder();
        builder.append("{"); //$NON-NLS-1$
        builder.append(lineSeparator);
        for (Iterator<?> iterator = map.entrySet().iterator(); iterator.hasNext();) {
            Entry<?, ?> entry = (Entry<?, ?>)iterator.next();
            builder.append(String.valueOf(entry.getKey()));
            builder.append("="); //$NON-NLS-1$
            builder.append(String.valueOf(entry.getValue()));
            builder.append(lineSeparator);
        }
        builder.append("}"); //$NON-NLS-1$
        return builder.toString();
    }

    public static String valueOf(List<?> list) {
        if (list == null) {
            return "null"; //$NON-NLS-1$
        }
        StringBuilder builder = new StringBuilder();
        builder.append("["); //$NON-NLS-1$
        builder.append(lineSeparator);
        for (Iterator<?> iterator = list.iterator(); iterator.hasNext();) {
            Object object = iterator.next();
            builder.append(String.valueOf(object));
            builder.append(lineSeparator);
        }
        builder.append("]"); //$NON-NLS-1$
        return builder.toString();
    }

    public static String[] fastSplit(String string, String delimiter) {
        return fastSplit(string, delimiter, true);
    }

    public static String[] fastSplit(String string, String delimiter, boolean strict) {
        return fastSplit(string, delimiter, strict, false);
    }

    public static String[] fastSplitTemplate(String string, String delimiter) {
        return fastSplitTemplate(string, delimiter, true);
    }

    public static String[] fastSplitTemplate(String string, String delimiter, boolean strict) {
        return fastSplit(string, delimiter, strict, true);
    }

    public static String[] fastSplit(String string,
                                     String delimiter,
                                     boolean strict,
                                     boolean template) {
        if (string == null) {
            return new String[0];
        }

        if (string.equals("")) { //$NON-NLS-1$
            return new String[] {""}; //$NON-NLS-1$
        }

        List<String> tmpResults = new ArrayList<String>();
        int delimiterLength = delimiter.length();
        int delimiterIndex = 0;
        int fromIndex = 0;
        int stringLen = string.length();
        int index = 0;

        // collect all the tokens
        while ((index != -1)) {

            // if the delimiter is at the end of the string
            if (fromIndex >= string.length()) {
                if (strict) {
                    tmpResults.add(""); //$NON-NLS-1$
                }
                break;
            }

            if (template) {
                boolean done = false;
                int brackets = 0;
                index = fromIndex;
                int maxIndex = string.length();
                while (!done) {
                    if (index >= maxIndex) {
                        index = -1;
                        done = true;
                    } else if (string.startsWith(delimiter, index) && brackets == 0) {
                        done = true;
                    } else {
                        if (string.charAt(index) == '{') {
                            ++brackets;
                        } else if (string.charAt(index) == '}') {
                            brackets = (brackets == 0 ? 0 : brackets - 1);
                        }
                        ++index;
                    }
                }
            } else {
                index = string.indexOf(delimiter, fromIndex);
            }

            if (index == -1) {
                delimiterIndex = stringLen;
            } else {
                delimiterIndex = index;
            }

            tmpResults.add(string.substring(fromIndex, delimiterIndex));
            fromIndex = delimiterIndex + delimiterLength;
        }

        return tmpResults.toArray(new String[tmpResults.size()]);
    }

    public static boolean isEmptyArray(Object object) {
        if (object != null) {
            if (object instanceof Object[] && ((Object[])object).length == 0) {
                return true;
            }
            if (object instanceof Collection<?> && ((Collection<?>)object).size() == 0) {
                return true;
            }
        }
        return false;
    }

}