svn-gvsig-desktop / trunk / libraries / libGDBMS / src / com / hardcode / gdbms / engine / instruction / TermAdapter.java @ 466
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| 1 | 466 | fernando | /* Generated by Together */
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| 2 | package com.hardcode.gdbms.engine.instruction; |
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| 3 | |||
| 4 | import com.hardcode.gdbms.engine.data.DriverException; |
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| 5 | import com.hardcode.gdbms.engine.values.Value; |
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| 6 | import com.hardcode.gdbms.parser.ASTSQLColRef; |
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| 7 | import com.hardcode.gdbms.parser.ASTSQLFunction; |
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| 8 | import com.hardcode.gdbms.parser.ASTSQLLiteral; |
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| 9 | import com.hardcode.gdbms.parser.ASTSQLOrExpr; |
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| 10 | import com.hardcode.gdbms.parser.SimpleNode; |
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| 11 | |||
| 12 | |||
| 13 | /**
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| 14 | * Wrapper sobre el nodo Term del arbol sint?ctico
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| 15 | *
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| 16 | * @author Fernando Gonz?lez Cort?s
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| 17 | */
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| 18 | public class TermAdapter extends AbstractExpression implements Expression { |
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| 19 | /**
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| 20 | * @see com.hardcode.gdbms.engine.instruction.Expression#evaluate(long)
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| 21 | */
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| 22 | public Value evaluate(long row) throws SemanticException, DriverException { |
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| 23 | Adapter[] hijos = getChilds();
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| 24 | |||
| 25 | if (hijos[0] instanceof Expression) { |
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| 26 | return ((Expression) hijos[0]).evaluateExpression(row); |
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| 27 | } else {
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| 28 | return null; |
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| 29 | } |
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| 30 | } |
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| 31 | |||
| 32 | /**
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| 33 | * @see com.hardcode.gdbms.engine.instruction.Expression#getFieldName()
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| 34 | */
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| 35 | public String getFieldName() { |
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| 36 | SimpleNode child = (SimpleNode) getEntity().jjtGetChild(0);
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| 37 | |||
| 38 | if (child.first_token.image.equals("(")) { |
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| 39 | child = (SimpleNode) getEntity().jjtGetChild(0);
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| 40 | } |
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| 41 | |||
| 42 | if (child.getClass() == ASTSQLColRef.class) {
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| 43 | return Utilities.getText(child); |
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| 44 | } else {
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| 45 | return null; |
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| 46 | } |
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| 47 | } |
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| 48 | |||
| 49 | /**
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| 50 | * @see com.hardcode.gdbms.engine.instruction.Expression#isLiteral()
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| 51 | */
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| 52 | public boolean isLiteral() { |
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| 53 | return literal;
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| 54 | } |
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| 55 | |||
| 56 | /**
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| 57 | * @see com.hardcode.gdbms.engine.instruction.Expression#simplify()
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| 58 | */
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| 59 | public void simplify() { |
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| 60 | getParent().replaceChild(this, getChilds()[0]); |
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| 61 | } |
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| 62 | |||
| 63 | /**
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| 64 | * @see com.hardcode.gdbms.engine.instruction.Expression#calculateLiteralCondition()
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| 65 | */
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| 66 | public void calculateLiteralCondition() { |
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| 67 | SimpleNode child = (SimpleNode) getEntity().jjtGetChild(0);
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| 68 | |||
| 69 | if (child.first_token.image.equals("(")) { |
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| 70 | child = (SimpleNode) getEntity().jjtGetChild(0);
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| 71 | } |
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| 72 | |||
| 73 | if (child.getClass() == ASTSQLColRef.class) {
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| 74 | literal = false;
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| 75 | } else if (child.getClass() == ASTSQLFunction.class) { |
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| 76 | literal = false;
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| 77 | } else if (child.getClass() == ASTSQLLiteral.class) { |
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| 78 | literal = true;
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| 79 | } else if (child.getClass() == ASTSQLOrExpr.class) { |
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| 80 | literal = ((Expression) getChilds()[0]).isLiteral(); |
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| 81 | } else {
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| 82 | throw new RuntimeException("really passed the parse???"); |
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| 83 | } |
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| 84 | } |
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| 85 | } |