extensions/serializer/src/main/java/org/apache/abdera/converter/AbstractConventions.java

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  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.  For additional information regarding
* copyright in this work, please see the NOTICE file in the top level
* directory of this distribution.
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package org.apache.abdera.converter;

import java.io.Serializable;
import java.lang.annotation.Annotation;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Member;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Pattern;

import org.apache.abdera.converter.annotation.Convention;

public abstract class AbstractConventions
    implements Conventions, 
               Cloneable,
               Serializable {
  
  private final Map<Class<? extends Annotation>,Pattern> conventions = 
    new HashMap<Class<? extends Annotation>,Pattern>();
  private final boolean isCaseSensitive;
  
  protected AbstractConventions() {
    this(false);
  }
  
  protected AbstractConventions(boolean isCaseSensitive) {
    this.isCaseSensitive = isCaseSensitive;
  }

  public void setConvention(
    String pattern,
    Class<? extends Annotation> annotationType) {
      Pattern regex = 
        isCaseSensitive ? 
          Pattern.compile(pattern) : 
          Pattern.compile(pattern,Pattern.CASE_INSENSITIVE);
        conventions.put(annotationType, regex);
  }
  
  public void setConvention(
    Class<? extends Annotation> annotationType) {
      Convention conv = annotationType.getAnnotation(Convention.class);
      if (conv == null) 
        throw new IllegalArgumentException(
          "No Convention Annotation [" + annotationType + "]");
      setConvention(conv.value(),annotationType);
  }
  
  public Class<? extends Annotation> matchConvention(
    AccessibleObject accessor) {
      return matchConvention(accessor, null);
  }

  public Class<? extends Annotation> matchConvention(
    AccessibleObject accessor, 
    Class<? extends Annotation> expect) {
      if (accessor == null) return null;
      String name = ((Member)accessor).getName();
      for (Map.Entry<Class<? extends Annotation>, Pattern> entry : conventions.entrySet()) {
        if (entry.getValue().matcher(name).matches() && 
           (expect == null || expect == entry.getKey()))
          return entry.getKey();
      }
      return null;
  }
  
  public boolean isMatch(
    AccessibleObject accessor, 
    Class<? extends Annotation> expect) {
      return matchConvention(accessor,expect) != null;
  }

  @Override
  public int hashCode() {
    final int PRIME = 31;
    int result = 1;
    result = PRIME * result + ((conventions == null) ? 0 : conventions.hashCode());
    result = PRIME * result + (isCaseSensitive ? 1231 : 1237);
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) return true;
    if (obj == null) return false;
    if (getClass() != obj.getClass()) return false;
    final AbstractConventions other = (AbstractConventions) obj;
    if (conventions == null) {
      if (other.conventions != null) return false;
    } else if (!conventions.equals(other.conventions)) return false;
    if (isCaseSensitive != other.isCaseSensitive) return false;
    return true;
  }
 
  public Conventions clone() {
    try {
      return (Conventions)super.clone();
    } catch (CloneNotSupportedException e) {
      return copy();
    }
  }
  
  protected Conventions copy() {
    throw new ConversionException(
      new CloneNotSupportedException());
  }
}