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A library for settings and parameterization of objects. Key features are support for data types, help for settings and parameters, annotations for ease of use. Settings and parameters both are Clonable and Serializable. More features for settings such as parsing a settingsfile, being observable, readonliness, caching etc. are available. The library contains javacc generated parsers for syntax support for properties, multi valued properties, parameterized objects and multi valued parameters.
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package com.vectorprint.configuration.binding;

/*
 * #%L
 * VectorPrintReport4.0
 * %%
 * Copyright (C) 2012 - 2013 VectorPrint
 * %%
 * 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.
 * #L%
 */
//~--- non-JDK imports --------------------------------------------------------
import com.vectorprint.VectorPrintRuntimeException;
import static com.vectorprint.configuration.binding.AbstractBindingHelperDecorator.*;
import static com.vectorprint.configuration.binding.BindingHelper.BOOLEAN_PARSER;
import static com.vectorprint.configuration.binding.BindingHelper.BYTE_PARSER;
import static com.vectorprint.configuration.binding.BindingHelper.CHAR_PARSER;
import static com.vectorprint.configuration.binding.BindingHelper.CLASS_PARSER;
import static com.vectorprint.configuration.binding.BindingHelper.COLOR_PARSER;
import static com.vectorprint.configuration.binding.BindingHelper.DATE_PARSER;
import static com.vectorprint.configuration.binding.BindingHelper.DOUBLE_PARSER;
import static com.vectorprint.configuration.binding.BindingHelper.FILE_PARSER;
import static com.vectorprint.configuration.binding.BindingHelper.FLOAT_PARSER;
import static com.vectorprint.configuration.binding.BindingHelper.INT_PARSER;
import static com.vectorprint.configuration.binding.BindingHelper.LONG_PARSER;
import static com.vectorprint.configuration.binding.BindingHelper.REGEX_PARSER;
import static com.vectorprint.configuration.binding.BindingHelper.SHORT_PARSER;
import static com.vectorprint.configuration.binding.BindingHelper.URL_PARSER;
import com.vectorprint.configuration.binding.parameters.ParameterizableBindingFactory;
import com.vectorprint.configuration.binding.settings.EnhancedMapBindingFactory;
import java.awt.Color;
import java.io.File;
import java.net.URL;
import java.util.Date;
import java.util.regex.Pattern;

//~--- JDK imports ------------------------------------------------------------
/**
 * Responsible for converting Strings into (atomic) values and vise versa and for escaping meaningful characters for a
 * certain syntax. Use this default implementation in {@link AbstractBindingHelperDecorator#AbstractBindingHelperDecorator(com.vectorprint.configuration.binding.BindingHelper)
 * } when extending it.
 *
 * Threadsafe: it is safe to call the available methods from different threads at the same time on one instance of this
 * class.
 *
 * @see StringConverter
 * @author Eduard Drenth at VectorPrint.nl
 */
public class BindingHelperImpl implements BindingHelper {

   /**
    * preferably use {@link ParameterizableBindingFactory#getBindingHelper() } or {@link EnhancedMapBindingFactory#getBindingHelper()
    * }
    */
   public BindingHelperImpl() {
   }

   /**
    * supports arrays of primitives and their wrappers, enums, URL, Color, Date, Pattern and String
    *
    * @param 
    * @param values
    * @param clazz
    * @return
    */
   @Override
   public  T convert(String[] values, Class clazz) {
      if (values == null | values.length == 0) {
         return null;
      }
      if (!clazz.isArray()) {
         throw new VectorPrintRuntimeException(clazz.getName() + " not supported");
      }
      Object o = null;
      if (String[].class.equals(clazz)) {
         return (T) values;
      }
      if (URL[].class.equals(clazz)) {
         o = parseURLValues(values);
      } else if (float[].class.equals(clazz)) {
         o = parseFloatValues(values);
      } else if (File[].class.equals(clazz)) {
         o = parseFileValues(values);
      } else if (double[].class.equals(clazz)) {
         o = parseDoubleValues(values);
      } else if (short[].class.equals(clazz)) {
         o = parseShortValues(values);
      } else if (char[].class.equals(clazz)) {
         o = parseCharValues(values);
      } else if (byte[].class.equals(clazz)) {
         o = parseByteValues(values);
      } else if (int[].class.equals(clazz)) {
         o = parseIntValues(values);
      } else if (long[].class.equals(clazz)) {
         o = parseLongValues(values);
      } else if (boolean[].class.equals(clazz)) {
         o = parseBooleanValues(values);
      } else if (Float[].class.equals(clazz)) {
         o = parseFloatObjects(values);
      } else if (Double[].class.equals(clazz)) {
         o = parseDoubleObjects(values);
      } else if (Short[].class.equals(clazz)) {
         o = parseShortObjects(values);
      } else if (Character[].class.equals(clazz)) {
         o = parseCharObjects(values);
      } else if (Byte[].class.equals(clazz)) {
         o = parseByteObjects(values);
      } else if (Integer[].class.equals(clazz)) {
         o = parseIntObjects(values);
      } else if (Long[].class.equals(clazz)) {
         o = parseLongObjects(values);
      } else if (Boolean[].class.equals(clazz)) {
         o = parseBooleanObjects(values);
      } else if (Color[].class.equals(clazz)) {
         o = parseColorValues(values);
      } else if (Date[].class.equals(clazz)) {
         o = parseDateValues(values);
      } else if (Class[].class.equals(clazz)) {
         o = parseClassValues(values);
      } else if (clazz.isArray() && clazz.getComponentType().isEnum()) {
         o = parseEnumValues(values, (Class) clazz.getComponentType());
      } else {
         throw new VectorPrintRuntimeException(clazz.getName() + " not supported");
      }
      return (T) o;
   }

   /**
    * supports primitives and their wrappers, enums, URL, Color, Date, Pattern and String
    *
    * @param 
    * @param value
    * @param clazz
    * @return
    */
   @Override
   public  T convert(String value, Class clazz) {
      if (value == null || value.isEmpty()) {
         return null;
      }
      Object o = null;
      if (String.class.equals(clazz)) {
         o = value;
      } else if (Boolean.class.equals(clazz)) {
         o = BOOLEAN_PARSER.convert(value);
      } else if (Byte.class.equals(clazz)) {
         o = BYTE_PARSER.convert(value);
      } else if (Character.class.equals(clazz)) {
         o = CHAR_PARSER.convert(value);
      } else if (Short.class.equals(clazz)) {
         o = SHORT_PARSER.convert(value);
      } else if (Double.class.equals(clazz)) {
         o = DOUBLE_PARSER.convert(value);
      } else if (Float.class.equals(clazz)) {
         o = FLOAT_PARSER.convert(value);
      } else if (Integer.class.equals(clazz)) {
         o = INT_PARSER.convert(value);
      } else if (Long.class.equals(clazz)) {
         o = LONG_PARSER.convert(value);
      } else if (boolean.class.equals(clazz)) {
         o = Boolean.parseBoolean(value);
      } else if (byte.class.equals(clazz)) {
         o = Byte.parseByte(value);
      } else if (char.class.equals(clazz)) {
         o = value.charAt(0);
      } else if (short.class.equals(clazz)) {
         o = Short.parseShort(value);
      } else if (double.class.equals(clazz)) {
         o = Double.parseDouble(value);
      } else if (float.class.equals(clazz)) {
         o = Float.parseFloat(value);
      } else if (int.class.equals(clazz)) {
         o = Integer.parseInt(value);
      } else if (long.class.equals(clazz)) {
         o = Long.parseLong(value);
      } else if (Color.class.equals(clazz)) {
         o = COLOR_PARSER.convert(value);
      } else if (URL.class.equals(clazz)) {
         o = URL_PARSER.convert(value);
      } else if (File.class.equals(clazz)) {
         o = FILE_PARSER.convert(value);
      } else if (Date.class.equals(clazz)) {
         o = DATE_PARSER.convert(value);
      } else if (Class.class.equals(clazz)) {
         o = CLASS_PARSER.convert(value);
      } else if (Pattern.class.equals(clazz)) {
         o = REGEX_PARSER.convert(value);
      } else if (clazz.isEnum()) {
         try {
            o = Enum.valueOf((Class) clazz, value);
         } catch (IllegalArgumentException e) {
            o = Enum.valueOf((Class) clazz, value.toUpperCase());
         }
      } else {
         throw new VectorPrintRuntimeException(clazz.getName() + " not supported");
      }
      return (T) o;
   }

   /**
    * Escapes {@link #setEscapeChars(char[]) characters} to be escaped. There is no magic, this method simply puts a \
    * before characters to be escaped. This works fine when serializing values that are the result of parsing a String
    * with special characters.
    *
    * @param value
    * @return
    */
   public final String escape(String value) {
      if (chars == null || chars.length == 0 || value == null || value.isEmpty()) {
         return value;
      }
      String s = value;
      for (char c : chars) {
         s = s.replace(String.valueOf(c), "\\" + c);
      }
      return s;
   }

   private char[] chars = null;

   @Override
   public void setEscapeChars(char[] chars) {
      this.chars = chars;
   }

   private char separator = ',';

   /**
    * default is ","
    *
    * @param separator
    */
   @Override
   public void setArrayValueSeparator(char separator) {
      this.separator = separator;
   }

   @Override
   public char getArrayValueSeparator() {
      return separator;
   }

   /**
    *
    * @param value
    * @return the String
    */
   @Override
   public String serializeValue(Object value) {
      StringBuilder sb = new StringBuilder();
      if (value == null) {
         return null;
      }
      Class clazz = value.getClass();
      if (!clazz.isArray()) {
         if (value instanceof Color) {
            sb.append(colorToHex((Color) value));
         } else {
            sb.append(escape(String.valueOf(value)));
         }
         return sb.toString();
      }
      if (!clazz.getComponentType().isPrimitive()) {
         Object[] O = (Object[]) value;
         if (O.length == 0) {
            return null;
         }
         int l = O.length;
         for (int i = 0;; i++) {
            String v = "null";
            if (O[i] != null) {
               if (O[i] instanceof Color) {
                  v = colorToHex((Color) O[i]);
               } else {
                  v = String.valueOf(O[i]);
               }
            }
            v = escape(v);
            if (i == l - 1) {
               sb.append(v);
               break;
            }
            sb.append(v).append(separator);
         }
      } else if (short[].class.isInstance(value)) {
         short[] s = (short[]) value;
         if (s.length == 0) {
            return null;
         }
         int l = s.length;
         for (int i = 0;; i++) {
            if (i == l - 1) {
               sb.append(String.valueOf(s[i]));
               break;
            }
            sb.append(String.valueOf(s[i])).append(separator);
         }
      } else if (int[].class.isInstance(value)) {
         int[] s = (int[]) value;
         if (s.length == 0) {
            return null;
         }
         int l = s.length;
         for (int i = 0;; i++) {
            if (i == l - 1) {
               sb.append(String.valueOf(s[i]));
               break;
            }
            sb.append(String.valueOf(s[i])).append(separator);
         }
      } else if (long[].class.isInstance(value)) {
         long[] s = (long[]) value;
         if (s.length == 0) {
            return null;
         }
         int l = s.length;
         for (int i = 0;; i++) {
            if (i == l - 1) {
               sb.append(String.valueOf(s[i]));
               break;
            }
            sb.append(String.valueOf(s[i])).append(separator);
         }
      } else if (float[].class.isInstance(value)) {
         float[] s = (float[]) value;
         if (s.length == 0) {
            return null;
         }
         int l = s.length;
         for (int i = 0;; i++) {
            if (i == l - 1) {
               sb.append(String.valueOf(s[i]));
               break;
            }
            sb.append(String.valueOf(s[i])).append(separator);
         }
      } else if (double[].class.isInstance(value)) {
         double[] s = (double[]) value;
         if (s.length == 0) {
            return null;
         }
         int l = s.length;
         for (int i = 0;; i++) {
            if (i == l - 1) {
               sb.append(String.valueOf(s[i]));
               break;
            }
            sb.append(String.valueOf(s[i])).append(separator);
         }
      } else if (byte[].class.isInstance(value)) {
         byte[] s = (byte[]) value;
         if (s.length == 0) {
            return null;
         }
         int l = s.length;
         for (int i = 0;; i++) {
            if (i == l - 1) {
               sb.append(String.valueOf(s[i]));
               break;
            }
            sb.append(String.valueOf(s[i])).append(separator);
         }
      } else if (boolean[].class.isInstance(value)) {
         boolean[] s = (boolean[]) value;
         if (s.length == 0) {
            return null;
         }
         int l = s.length;
         for (int i = 0;; i++) {
            if (i == l - 1) {
               sb.append(String.valueOf(s[i]));
               break;
            }
            sb.append(String.valueOf(s[i])).append(separator);
         }
      } else if (char[].class.isInstance(value)) {
         char[] s = (char[]) value;
         if (s.length == 0) {
            return null;
         }
         int l = s.length;
         for (int i = 0;; i++) {
            if (i == l - 1) {
               sb.append(String.valueOf(s[i]));
               break;
            }
            sb.append(String.valueOf(s[i])).append(separator);
         }
      }
      return sb.toString();
   }

}