/**
    * Copyright 2010-2013 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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.kuali.common.jdbc.suppliers;
  
  import java.util.List;
  
  import org.kuali.common.jdbc.service.MetaDataUtils;
  import org.kuali.common.jdbc.sql.model.SqlMetaData;
  import org.kuali.common.util.Assert;
  import org.kuali.common.util.CollectionUtils;
  import org.kuali.common.util.ListUtils;
  
  /**
   * Supply SQL from strings that have one SQL statement each
   */
  public final class SimpleStringSupplier extends AbstractSupplier {
  
  	private final SqlMetaData metaData;
  	private final List<String> strings;
  	private boolean open = false;
  	private boolean done = false;
  
  	public SimpleStringSupplier(String sql) {
  		this(CollectionUtils.singletonList(sql));
  	}
  
  	public SimpleStringSupplier(List<String> strings) {
  		Assert.notNull(strings);
  		this.strings = ListUtils.newImmutableArrayList(strings);
  		this.metaData = MetaDataUtils.getSqlMetaData(this);
  	}
  
  	@Override
  	public synchronized void open() {
  		Assert.isFalse(open, "Already open");
  		this.open = true;
  		this.done = false;
  	}
  
  	@Override
  	public synchronized List<String> getSql() {
  		Assert.isTrue(open, "Not open");
  		if (done) {
  			return null;
  		} else {
  			this.done = true;
  			return strings;
  		}
  	}
  
  	@Override
  	public synchronized void close() {
  		Assert.isTrue(open, "Not open");
  		this.open = false;
  	}
  
  	@Override
  	public SqlMetaData getMetaData() {
  		return metaData;
  	}
  
  	public List<String> getStrings() {
  		return strings;
  	}
  
  }