Android Open Source - android-http Query

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2012, 2013 the diamond:dogs|group
 */*from ww w.  j  a v a2  s .  com*/
 * 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.
 */
package at.diamonddogs.data.adapter.database;

import java.io.Serializable;
import java.util.Arrays;

import android.content.ContentResolver;
import android.net.Uri;
import android.text.TextUtils;
import android.util.Pair;

/**
 * A Query implementation to be used in conjunction with {@link DatabaseAdapter}
 */
public class Query implements Serializable {

  /**
   * Serializable version ID
   */
  private static final long serialVersionUID = 264618972515125929L;

  /**
   * Optional Content Uri
   */
  private String uri;
  /**
   * An array containing the field names of all where parameters
   */
  public String[] whereFields;
  /**
   * An array containing the values to be checked
   */
  public String[] whereValues;
  /**
   * An array containing all operators for corresponding whereValues and
   * whereFields
   */
  public String[] whereOperators;
  /**
   * An array containing AND or OR operators.
   */
  public String[] whereConditionOperators;
  /**
   * Projection array
   */
  public String[] projection = null;
  /**
   * An array of like expressions (only applicable if LIKE is used)
   */
  public String[] likeExpressions = null;
  /**
   * A sortorder
   */

  public String sortOrder = null;

  /**
   * Default constructor
   */
  public Query() {

  }

  /**
   * {@link Uri} constructor
   * 
   * @param uri
   *            a content uri
   */
  public Query(Uri uri) {
    setUri(uri);
  }

  private Pair<String, Boolean> validate() {
    // TODO: not entirly corrent -> what if one of the two is null and the
    // other isn't

    if ((whereFields != null && whereFields != null) && (whereFields.length != whereValues.length)) {
      return new Pair<String, Boolean>("whereFields / whereValues length mismatch", false);
    }
    if (whereOperators != null && whereOperators.length != whereFields.length) {
      return new Pair<String, Boolean>("whereField / whereOperators length mismatch", false);
    }
    if (whereConditionOperators != null && whereConditionOperators.length != (whereFields.length - 1)) {
      return new Pair<String, Boolean>("whereConditionOperators / whereFields mismatch", false);
    }
    if (whereOperators != null) {
      int likeCount = 0;
      for (String whereOperator : whereOperators) {
        if (whereOperator != null && whereOperator.equalsIgnoreCase("like")) {
          likeCount++;
        }
      }
      if (likeCount == 0 && likeExpressions == null) {
        return new Pair<String, Boolean>("", true);
      }
      if ((likeCount != 0 && likeExpressions == null) || (likeExpressions.length != likeCount)) {
        return new Pair<String, Boolean>("likeCount / likeExpressions mismatch", false);
      }
    }
    return new Pair<String, Boolean>("", true);
  }

  /**
   * Create the selection parameter for
   * {@link ContentResolver#query(android.net.Uri, String[], String, String[], String)}
   * 
   * @return a {@link String} containing the where clause
   */
  public String createSelection() {
    Pair<String, Boolean> valid = validate();
    if (!valid.second) {
      throw new RuntimeException("Query invalid: " + valid.first);
    }
    if (whereFields == null && whereValues == null) {
      return null;
    }

    if (whereOperators == null) {
      whereOperators = new String[whereFields.length];
      Arrays.fill(whereOperators, 0, whereOperators.length, "=");
    }

    String ret = "";
    int likeCount = 0;
    for (int i = 0; i < whereFields.length; i++) {
      if (whereOperators[i].equalsIgnoreCase("like")) {
        ret += whereFields[i] + " " + whereOperators[i] + " " + likeExpressions[likeCount];
        likeCount++;
      } else {
        ret += whereFields[i] + whereOperators[i] + "?";
      }
      if ((i + 1) < whereFields.length) {
        if (whereConditionOperators == null) {
          ret += " AND ";
        } else {
          ret += " " + whereConditionOperators[i] + " ";
        }
      }
    }
    return ret;
  }

  @Override
  public String toString() {
    return "Query [uri=" + getUri() + ", whereFields=" + Arrays.toString(whereFields) + ", whereValues=" + Arrays.toString(whereValues)
        + ", whereOperators=" + Arrays.toString(whereOperators) + ", whereConditionOperators="
        + Arrays.toString(whereConditionOperators) + ", projection=" + Arrays.toString(projection) + ", likeExpressions="
        + Arrays.toString(likeExpressions) + ", sortOrder=" + sortOrder + "]";
  }

  @SuppressWarnings("javadoc")
  public Uri getUri() {
    return TextUtils.isEmpty(uri) ? null : Uri.parse(uri);
  }

  @SuppressWarnings("javadoc")
  public void setUri(Uri uri) {
    this.uri = uri.toString();
  }

}

Java Source Code List

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