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 / GetitemFunction.java @ 44338
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| 1 | 44138 | jjdelcerro | package org.gvsig.expressionevaluator.impl.function.programming; |
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| 2 | 43512 | jjdelcerro | |
| 3 | 44138 | jjdelcerro | import java.util.List; |
| 4 | import java.util.Map; |
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| 5 | 43512 | jjdelcerro | import org.apache.commons.lang3.Range; |
| 6 | 44138 | jjdelcerro | import org.gvsig.expressionevaluator.ExpressionRuntimeException; |
| 7 | 43939 | jjdelcerro | import org.gvsig.expressionevaluator.Function; |
| 8 | 43521 | jjdelcerro | import org.gvsig.expressionevaluator.Interpreter; |
| 9 | 43512 | jjdelcerro | import org.gvsig.expressionevaluator.spi.AbstractFunction; |
| 10 | 44181 | jjdelcerro | import org.gvsig.tools.util.GetItem; |
| 11 | import org.gvsig.tools.util.GetItem64; |
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| 12 | 44203 | jjdelcerro | import org.gvsig.tools.util.GetItemByKey; |
| 13 | 44338 | jjdelcerro | import org.gvsig.tools.util.PropertiesSupport; |
| 14 | 43512 | jjdelcerro | |
| 15 | 44138 | jjdelcerro | public class GetitemFunction extends AbstractFunction { |
| 16 | 43512 | jjdelcerro | |
| 17 | 44138 | jjdelcerro | public static final String NAME = "GETITEM"; |
| 18 | |||
| 19 | public GetitemFunction() {
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| 20 | super(Function.GROUP_PROGRAMMING,
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| 21 | NAME, |
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| 22 | 44098 | jjdelcerro | Range.is(2),
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| 23 | 44138 | jjdelcerro | null,
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| 24 | null,
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| 25 | null,
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| 26 | 44098 | jjdelcerro | "Object",
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| 27 | false
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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 | 44138 | jjdelcerro | Object value;
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| 39 | Object obj = getObject(args, 0); |
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| 40 | if( obj == null ) { |
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| 41 | throw new ExpressionRuntimeException("Null is not valid in "+NAME+" function."); |
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| 42 | 43512 | jjdelcerro | } |
| 43 | 44138 | jjdelcerro | |
| 44 | if( obj instanceof List ) { |
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| 45 | 44151 | jjdelcerro | List l = ((List)obj); |
| 46 | 44138 | jjdelcerro | int index = getInt(args,1); |
| 47 | 44151 | jjdelcerro | if( index<0 ) { |
| 48 | index = l.size() + index; |
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| 49 | } |
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| 50 | value = l.get(index); |
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| 51 | 44138 | jjdelcerro | |
| 52 | } else if( obj instanceof CharSequence ) { |
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| 53 | 44151 | jjdelcerro | CharSequence s = (CharSequence)obj; |
| 54 | 44138 | jjdelcerro | int index = getInt(args,1); |
| 55 | 44151 | jjdelcerro | if( index<0 ) { |
| 56 | index = s.length() + index; |
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| 57 | } |
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| 58 | value = s.subSequence(index, index+1);
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| 59 | 44138 | jjdelcerro | |
| 60 | } else if( obj instanceof Map ) { |
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| 61 | 44151 | jjdelcerro | Map m = (Map)obj; |
| 62 | 44138 | jjdelcerro | Object index = getObject(args,1); |
| 63 | 44151 | jjdelcerro | value = m.get(index); |
| 64 | 44138 | jjdelcerro | |
| 65 | 44181 | jjdelcerro | } else if( obj instanceof GetItem ) { |
| 66 | GetItem l = (GetItem)obj; |
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| 67 | int index = getInt(args,1); |
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| 68 | value = l.get(index); |
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| 69 | |||
| 70 | } else if( obj instanceof GetItem64 ) { |
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| 71 | GetItem64 l = (GetItem64)obj; |
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| 72 | long index = getLong(args,1); |
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| 73 | value = l.get64(index); |
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| 74 | |||
| 75 | 44203 | jjdelcerro | } else if( obj instanceof GetItemByKey ) { |
| 76 | GetItemByKey l = (GetItemByKey)obj; |
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| 77 | Object key = getObject(args,1); |
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| 78 | value = l.get(key); |
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| 79 | |||
| 80 | 44338 | jjdelcerro | } else if( obj instanceof PropertiesSupport ) { |
| 81 | PropertiesSupport l = (PropertiesSupport)obj; |
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| 82 | String propName = getStr(args,1); |
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| 83 | value = l.getProperty(propName); |
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| 84 | |||
| 85 | 43939 | jjdelcerro | } else {
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| 86 | 44138 | jjdelcerro | throw new ExpressionRuntimeException("The "+NAME+" function require a String, List or Map and a received a '"+obj.getClass().getSimpleName()+"'."); |
| 87 | 43939 | jjdelcerro | } |
| 88 | 44138 | jjdelcerro | return value;
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| 89 | 43512 | jjdelcerro | } |
| 90 | |||
| 91 | } |