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/*
 * Copyright Red Hat, Inc. and/or its affiliates
 * and other contributors as indicated by the @author tags and
 * the COPYRIGHT.txt file distributed with this work.
 *
 * 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 org.teiid.query.sql.proc;

import org.teiid.core.util.EquivalenceUtil;
import org.teiid.core.util.HashCodeUtil;
import org.teiid.core.util.StringUtil;
import org.teiid.query.sql.LanguageVisitor;
import org.teiid.query.sql.lang.Command;
import org.teiid.query.sql.lang.Query;
import org.teiid.query.sql.lang.SubqueryContainer;
import org.teiid.query.sql.proc.Statement.Labeled;


/**
 * 

This class represents a loop statement in the storedprocedure language * to cursor through a result set. * It extends the Statement that could part of a block. This statement has * a block, a select statement and a cursor. * determines which block should be executed..

*/ public class LoopStatement extends Statement implements SubqueryContainer, Labeled { private String cursorName; private Block loopBlock; private Command query; private String label; public LoopStatement(Block block, Command query, String cursorName){ this.loopBlock = block; this.query = query; this.cursorName = cursorName; } public String getLabel() { return label; } public void setLabel(String label) { this.label = label; } /** * @return */ public String getCursorName() { return cursorName; } /** * @return */ public Block getBlock() { return loopBlock; } /** * @return */ public Command getCommand() { return query; } /** * Sets the command. */ public void setCommand(Command command){ this.query = command; } /** * @param string */ public void setCursorName(String cursorName) { this.cursorName = cursorName; } /** * @param block */ public void setBlock(Block block) { loopBlock = block; } /** * @param query */ public void setCommand(Query query) { this.query = query; } /** * Return the type for this statement, this is one of the types * defined on the statement object. * @return The statement type */ public int getType() { return Statement.TYPE_LOOP; } // ========================================================================= // P R O C E S S I N G M E T H O D S // ========================================================================= public void acceptVisitor(LanguageVisitor visitor) { visitor.visit(this); } /** * Deep clone statement to produce a new identical statement. * @return Deep clone */ public Object clone() { Block otherBlock = this.loopBlock.clone(); Command otherQuery = (Command) this.query.clone(); LoopStatement ls = new LoopStatement(otherBlock, otherQuery, this.cursorName); ls.setLabel(label); return ls; } /** * Compare two LoopStatements for equality. They will only evaluate to equal if * they are IDENTICAL: the blocks is same, the query is same, and the cursor name is same. * @param obj Other object * @return True if equal */ public boolean equals(Object obj) { // Quick same object test if(this == obj) { return true; } // Quick fail tests if(!(obj instanceof LoopStatement)) { return false; } LoopStatement other = (LoopStatement) obj; return // Compare the query EquivalenceUtil.areEqual(query, other.query) && // Compare the if block EquivalenceUtil.areEqual(loopBlock, other.loopBlock) && // Compare the else block EquivalenceUtil.areEqual(cursorName, other.cursorName) && StringUtil.equalsIgnoreCase(this.label, other.label); } /** * Get hashcode for LoopStatement. WARNING: This hash code relies on the * hash codes of the block and the query * on this statement. Hash code is only valid after the block has been * completely constructed. * @return Hash code */ public int hashCode() { // This hash code relies on the blocks and criteria for this statement int myHash = 0; myHash = HashCodeUtil.hashCode(myHash, this.loopBlock); myHash = HashCodeUtil.hashCode(myHash, this.query); myHash = HashCodeUtil.hashCode(myHash, this.cursorName); return myHash; } }




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