Android Open Source - android-webview-example Column Method Enumeration

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License

The source code is released under:

Apache License

Java Source Code

package com.significantfiles.android.provider.table;
//  www.  java  2  s . co m
import java.lang.reflect.Method;
import java.util.Enumeration;

import com.significantfiles.mrcounter.Constants;

import android.util.Log;

public final class ColumnMethodEnumeration implements
    Enumeration<Method> {
  
  private final Method[] methods;
  private Method cursor = null;
  private int index = -1;

  public ColumnMethodEnumeration(final Class<?> typeDefinition) {
    this.methods = typeDefinition.getMethods();
  }

  @Override
  public boolean hasMoreElements() {
    final boolean hasNoMoreEntries = (index >= methods.length);
    if (hasNoMoreEntries) {
      return false;
    }

    if (cursor == null) {
      return loadNextMethod();
    }

    return true;
  }

  private boolean loadNextMethod() {
    for (int i = (index + 1); i < methods.length; i++) {
      final Method method = methods[i];

      if (isTableField(method)) {
        this.cursor = method;
        this.index = i;
        break;
      }
    }

    return this.cursor != null;
  }

  private boolean isTableField(final Method method) {
    final SQLiteField annotation = method
        .getAnnotation(SQLiteField.class);

    if (annotation == null)
      return false;

    final Class<?> returnType = method.getReturnType();

    final boolean isCorrectReturnType = (returnType.isInterface() && isSQLiteType(returnType));

    return (isCorrectReturnType);
  }

  private boolean isSQLiteType(final Class<?> returnType) {
    return SQLiteType.class.isAssignableFrom(returnType);
  }

  @Override
  public Method nextElement() {
    if (cursor == null) {
      final String logMsg = "Couldn't find next method. Cursor is broken or miss-used [cursor = NULL]";
      Log.e( Constants.LOG_TAG, logMsg);

      throw new IllegalStateException();
    }

    final Method rval = cursor;
    cursor = null;
    return rval;
  }
}

Java Source Code List

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