[37] | 1 | function v = fromJava(jv)
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| 2 | %fromJava Convert from Java to Matlab.
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| 3 | % fromJava(jv) converts a Java object back into a matlab object, reversing
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| 4 | % the action of toJava.
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| 5 | %
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| 6 | % See also toJava.
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| 7 |
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| 8 | % Written by Thomas Minka
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| 9 | % (c) Microsoft Corporation. All rights reserved.
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| 10 |
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| 11 | if ~isjava(jv)
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| 12 | v = jv;
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| 13 | return
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| 14 | end
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| 15 | % class(jv) is expensive, so we do it only once
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| 16 | cl = class(jv);
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| 17 | % common cases first
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| 18 | if strncmp(cl,'java.lang.Double',16)
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| 19 | v = double(jv);
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| 20 | return
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| 21 | end
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| 22 | if strncmp(cl,'java.lang.String',16)
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| 23 | v = char(jv);
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| 24 | return
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| 25 | end
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| 26 | if strncmp(cl,'java.lang.Object[]',18)
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| 27 | sz = sizeJava(jv);
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| 28 | v = cell(1,prod(sz));
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| 29 | for i = 1:length(v)
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| 30 | index = substruct('()',num2cell(ind2subv(sz,i)));
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| 31 | elt = subsref(jv,index);
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| 32 | v{i} = fromJava(elt);
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| 33 | % this also works:
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| 34 | %v = subsasgn(v,index,elt);
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| 35 | end
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| 36 | v = reshape(v,sz);
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| 37 | return
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| 38 | end
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| 39 | if strcmp(cl,'java.util.Hashtable')
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| 40 | v = struct;
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| 41 | fields = jv.get('_fields');
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| 42 | if ~isempty(fields)
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| 43 | % create the fields in the right order
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| 44 | ke = fields.elements;
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| 45 | else
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| 46 | % create the fields in random order
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| 47 | ke = jv.keys;
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| 48 | end
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| 49 | while ke.hasMoreElements
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| 50 | f = ke.nextElement;
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| 51 | v = setfield(v,char(f),fromJava(jv.get(f)));
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| 52 | end
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| 53 | c = jv.get('_class');
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| 54 | if ~isempty(c)
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| 55 | % call the class constructor with the structure as argument
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| 56 | % (doesn't work for all classes)
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| 57 | v = feval(c,v);
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| 58 | end
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| 59 | return
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| 60 | end
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| 61 | if strcmp(cl,'java.util.Vector')
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| 62 | v = [];
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| 63 | return
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| 64 | end
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| 65 | if strcmp(cl,'java.util.BitSet')
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| 66 | v = {};
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| 67 | return
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| 68 | end
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| 69 | % use matlab's builtin converter from java.lang.Object
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| 70 | vec = java.util.Vector;
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| 71 | vec.addElement(jv);
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| 72 | v = vec.elementAt(0);
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