/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  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.
 */
package org.apache.phoenix.parse;

import org.apache.phoenix.compile.ColumnResolver;
import org.apache.phoenix.util.SchemaUtil;

/**
 * Node representing an aliased parse node in a SQL select clause
 * @since 0.1
 */
public class AliasedNode {
  private final String alias;
  private final ParseNode node;
  private final boolean isCaseSensitve;

  public AliasedNode(String alias, ParseNode node) {
    this.isCaseSensitve = alias != null && SchemaUtil.isCaseSensitive(alias);
    this.alias = alias == null ? null : SchemaUtil.normalizeIdentifier(alias);
    this.node = node;
  }

  public String getAlias() {
    return alias;
  }

  public ParseNode getNode() {
    return node;
  }

  public void toSQL(ColumnResolver resolver, StringBuilder buf) {
    node.toSQL(resolver, buf);
    if (alias != null) {
      buf.append(' ');
      if (isCaseSensitve) buf.append('"');
      buf.append(alias);
      if (isCaseSensitve) buf.append('"');
    }
  }

  @Override
  public int hashCode() {
    final int prime = 31;
    int result = 1;
    result = prime * result + ((alias == null) ? 0 : alias.hashCode());
    result = prime * result + ((node == null) ? 0 : node.hashCode());
    return result;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) return true;
    if (obj == null) return false;
    if (getClass() != obj.getClass()) return false;
    AliasedNode other = (AliasedNode) obj;
    if (alias == null) {
      if (other.alias != null) return false;
    } else if (!alias.equals(other.alias)) return false;
    if (node == null) {
      if (other.node != null) return false;
    } else if (!node.equals(other.node)) return false;
    return true;
  }

  public boolean isCaseSensitve() {
    return isCaseSensitve;
  }
}
