com.appslandia.plum.base.ConstDescProvider Maven / Gradle / Ivy

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// The MIT License (MIT)
// Copyright © 2015 AppsLandia. All rights reserved.

// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:

// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

package com.appslandia.plum.base;

import java.lang.reflect.Field;
import java.util.Collections;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.Objects;

import com.appslandia.common.base.ConstDesc;
import com.appslandia.common.base.InitializeException;
import com.appslandia.common.base.InitializeObject;
import com.appslandia.common.utils.ReflectionUtils;
import com.appslandia.common.utils.StringUtils;

/**
 *
 * @author Loc Ha
 *
 */
public class ConstDescProvider extends InitializeObject {

  private Map constKeyMap = new HashMap<>();

  @Override
  protected void init() throws Exception {
    this.constKeyMap = Collections.unmodifiableMap(this.constKeyMap);
  }

  public String getDescKey(String constGroup, Object value) {
    this.initialize();
    return this.constKeyMap.get(new ConstValue(constGroup, value));
  }

  public void addConstClass(Class constClass) {
    this.assertNotInitialized();
    try {
      String defConstGroup = parseConstGroup(constClass);

      for (Field field : constClass.getDeclaredFields()) {
        if (!ReflectionUtils.isPublicConst(field.getModifiers())) {
          continue;
        }
        if (field.getDeclaredAnnotation(ConstDesc.class) == null) {
          continue;
        }
        ConstDesc constDesc = field.getDeclaredAnnotation(ConstDesc.class);
        String constGroup = constDesc.value().isEmpty() ? defConstGroup : constDesc.value();

        // descKey: constGroup.constName
        String descKey = constGroup + "." + field.getName().toLowerCase(Locale.ENGLISH);
        this.constKeyMap.put(new ConstValue(constGroup, field.get(null)), descKey);
      }
    } catch (Exception ex) {
      throw new InitializeException(ex);
    }
  }

  public void addConst(String constGroup, Object value, String descKey) {
    this.constKeyMap.put(new ConstValue(constGroup, value), descKey);
  }

  private static String parseConstGroup(Class constClass) {
    ConstDesc constDesc = constClass.getDeclaredAnnotation(ConstDesc.class);
    if ((constDesc != null) && !constDesc.value().isEmpty()) {
      return constDesc.value();
    }
    return StringUtils.firstLowerCase(constClass.getSimpleName(), Locale.ENGLISH);
  }

  private static class ConstValue {

    final String constGroup;
    final Object value;

    public ConstValue(String constGroup, Object value) {
      this.constGroup = constGroup;
      this.value = value;
    }

    @Override
    public boolean equals(Object obj) {
      if (this == obj) {
        return true;
      }
      if (!(obj instanceof ConstValue)) {
        return false;
      }
      ConstValue that = (ConstValue) obj;
      return Objects.equals(this.constGroup, that.constGroup) && Objects.equals(this.value, that.value);
    }

    @Override
    public int hashCode() {
      int hash = 1, p = 31;
      hash = p * hash + Objects.hashCode(this.constGroup);
      hash = p * hash + Objects.hashCode(this.value);
      return hash;
    }
  }
}