svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.library / org.gvsig.expressionevaluator / org.gvsig.expressionevaluator.lib / org.gvsig.expressionevaluator.lib.impl / src / main / java / org / gvsig / expressionevaluator / impl / function / programming / GetattrFunction.java @ 46831
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| 1 | 44138 | jjdelcerro | package org.gvsig.expressionevaluator.impl.function.programming; |
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| 2 | 43512 | jjdelcerro | |
| 3 | 43939 | jjdelcerro | import java.lang.reflect.Field; |
| 4 | 43512 | jjdelcerro | import org.apache.commons.lang3.Range; |
| 5 | 44750 | jjdelcerro | import org.gvsig.expressionevaluator.AttributeHandler; |
| 6 | 45011 | jjdelcerro | import org.gvsig.expressionevaluator.Code; |
| 7 | import org.gvsig.expressionevaluator.Codes; |
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| 8 | 44748 | jjdelcerro | import static org.gvsig.expressionevaluator.ExpressionBuilder.FUNCTION_GETATTR; |
| 9 | 45011 | jjdelcerro | import org.gvsig.expressionevaluator.Formatter; |
| 10 | 43939 | jjdelcerro | import org.gvsig.expressionevaluator.Function; |
| 11 | 43521 | jjdelcerro | import org.gvsig.expressionevaluator.Interpreter; |
| 12 | 43512 | jjdelcerro | import org.gvsig.expressionevaluator.spi.AbstractFunction; |
| 13 | 44366 | jjdelcerro | import org.gvsig.tools.dynobject.DynObject; |
| 14 | 45114 | jjdelcerro | import org.gvsig.tools.util.GetItemByKey; |
| 15 | 43512 | jjdelcerro | |
| 16 | 43939 | jjdelcerro | public class GetattrFunction extends AbstractFunction { |
| 17 | 43512 | jjdelcerro | |
| 18 | 43939 | jjdelcerro | public GetattrFunction() {
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| 19 | 44750 | jjdelcerro | super(
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| 20 | Function.GROUP_PROGRAMMING, |
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| 21 | FUNCTION_GETATTR, |
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| 22 | Range.is(2),
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| 23 | null,
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| 24 | 44924 | jjdelcerro | "GETATTR({{object}}, attribute_name_as_string)",
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| 25 | 44750 | jjdelcerro | null,
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| 26 | null,
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| 27 | true
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| 28 | ); |
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| 29 | 43512 | jjdelcerro | } |
| 30 | 44138 | jjdelcerro | |
| 31 | 43512 | jjdelcerro | @Override
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| 32 | 44138 | jjdelcerro | public boolean allowConstantFolding() { |
| 33 | return false; |
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| 34 | } |
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| 35 | |||
| 36 | @Override
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| 37 | 43521 | jjdelcerro | public Object call(Interpreter interpreter, Object[] args) throws Exception { |
| 38 | 43939 | jjdelcerro | Object obj = getObject(args, 0); |
| 39 | String attrname = getStr(args,1); |
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| 40 | if( attrname == null ) { |
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| 41 | throw new NullPointerException("A attribute name was expected and a null was received"); |
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| 42 | 43512 | jjdelcerro | } |
| 43 | 43939 | jjdelcerro | if( obj==null ) { |
| 44 | 45236 | omartinez | return null; |
| 45 | //throw new NullPointerException("An object pointer was expected to access attribute "+attrname+" and a null was received");
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| 46 | 43939 | jjdelcerro | } |
| 47 | 44366 | jjdelcerro | Object value;
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| 48 | if( obj instanceof DynObject ) { |
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| 49 | value = ((DynObject) obj).getDynValue(attrname); |
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| 50 | 44750 | jjdelcerro | } else if( obj instanceof AttributeHandler ) { |
| 51 | value = ((AttributeHandler) obj).get(attrname); |
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| 52 | 45114 | jjdelcerro | } else if( obj instanceof GetItemByKey ) { |
| 53 | value = ((GetItemByKey) obj).get(attrname); |
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| 54 | 44366 | jjdelcerro | } else {
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| 55 | Class<?> theClass = obj.getClass();
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| 56 | Field field = theClass.getField(attrname);
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| 57 | value = field.get(obj); |
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| 58 | } |
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| 59 | 43939 | jjdelcerro | return value;
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| 60 | 43512 | jjdelcerro | } |
| 61 | 45011 | jjdelcerro | |
| 62 | @Override
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| 63 | public String toString(Codes args, Formatter<Code> formatter) { |
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| 64 | StringBuilder builder = new StringBuilder(); |
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| 65 | Code arg0 = args.get(0);
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| 66 | Code arg1 = args.get(1);
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| 67 | 46010 | jjdelcerro | // if( arg0 instanceof Code.Identifier && arg1 instanceof Code.Identifier ) {
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| 68 | // builder.append(arg0.toString(formatter));
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| 69 | // builder.append("->");
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| 70 | // builder.append(arg1.toString());
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| 71 | // } else
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| 72 | if( arg0 instanceof Code.Identifier && arg1 instanceof Code.Constant && ((Code.Constant)arg1).value() instanceof CharSequence ) { |
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| 73 | 45011 | jjdelcerro | builder.append(arg0.toString(formatter)); |
| 74 | 46010 | jjdelcerro | builder.append(".\"");
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| 75 | builder.append(((Code.Constant)arg1).value().toString()); |
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| 76 | builder.append("\"");
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| 77 | 45011 | jjdelcerro | } else {
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| 78 | builder.append(this.name());
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| 79 | builder.append("(");
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| 80 | builder.append(arg0.toString(formatter)); |
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| 81 | builder.append(", ");
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| 82 | builder.append(arg1.toString(formatter)); |
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| 83 | builder.append(")");
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| 84 | } |
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| 85 | return builder.toString();
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| 86 | } |
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| 87 | 43512 | jjdelcerro | |
| 88 | } |