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1 package nabble.naml.compiler;
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2
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3 import java.io.StringWriter;
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4 import nabble.model.Init;
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5
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6
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7 class BlockWrapper {
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8 private static final int blockWriterLimit = Init.get("blockWriterLimit",10 * 1024 * 1024);
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9
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10 private final Chunk block;
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11 private final RunState runState;
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12
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13 BlockWrapper(Chunk block,RunState runState) {
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14 this.block = block;
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15 this.runState = runState;
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16 }
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17
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18 private static class BlockWriter extends TemplatePrintWriter {
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19 private final StringWriter sw;
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20 private boolean isNull = false;
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21
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22 BlockWriter(StringWriter sw) {
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23 super(sw);
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24 this.sw = sw;
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25 }
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26
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27 public void print(Object obj) {
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28 if( obj == null && sw.getBuffer().length() == 0 && !isNull ) {
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29 isNull = true;
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30 return;
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31 }
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32 super.print(obj);
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33 checkSize();
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34 }
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35
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36 public void print(String s) {
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37 if( s == null && sw.getBuffer().length() == 0 && !isNull ) {
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38 isNull = true;
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39 return;
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40 }
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41 super.print(s);
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42 checkSize();
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43 }
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44
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45 private void checkSize() {
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46 if( sw.getBuffer().length() > blockWriterLimit )
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47 throw new RuntimeException("BlockWriter too big");
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48 }
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49
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50 String value() {
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51 if( isNull ) {
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52 if( sw.getBuffer().length() > 0 )
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53 throw new NullPointerException("null written to stream");
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54 return null;
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55 }
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56 return sw.toString();
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57 }
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58 }
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59
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60 public final String toString() {
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61 BlockWriter out = new BlockWriter(new StringWriter());
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62 printTo(out);
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63 out.close();
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64 return out.value();
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65 }
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66
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67 void printTo(IPrintWriter out) {
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68 block.run(out,runState);
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69 }
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70 }
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