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| package org.apache.tapestry.util.io; |
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| import java.util.Iterator; |
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| import java.util.List; |
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| import org.apache.hivemind.lib.util.StrategyRegistry; |
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| import org.apache.hivemind.lib.util.StrategyRegistryImpl; |
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| import org.apache.tapestry.Tapestry; |
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| import org.apache.tapestry.services.DataSqueezer; |
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| public class DataSqueezerImpl implements DataSqueezer |
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| { |
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| private static final String NULL_PREFIX = "X"; |
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| private static final int ARRAY_SIZE = 90; |
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| private static final int FIRST_ADAPTOR_OFFSET = 33; |
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| private SqueezeAdaptor[] _adaptorByPrefix = new SqueezeAdaptor[ARRAY_SIZE]; |
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| private StrategyRegistry _adaptors = new StrategyRegistryImpl(); |
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| public void setSqueezeAdaptors(List adaptors)
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| { |
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| Iterator i = adaptors.iterator();
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| while (i.hasNext())
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| { |
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| SqueezeAdaptor adaptor = (SqueezeAdaptor) i.next();
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| register(adaptor);
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| } |
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| } |
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| public synchronized void register(SqueezeAdaptor adaptor)
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| { |
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| if (adaptor == null)
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| throw new IllegalArgumentException(Tapestry.getMessage("DataSqueezer.null-adaptor"));
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| String prefix = adaptor.getPrefix();
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| int prefixLength = prefix.length();
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| int offset;
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| if (prefixLength < 1)
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| throw new IllegalArgumentException(Tapestry.getMessage("DataSqueezer.short-prefix"));
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| Class dataClass = adaptor.getDataClass();
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| if (dataClass == null)
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| throw new IllegalArgumentException(Tapestry.getMessage("DataSqueezer.null-class"));
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| for (int i = 0; i < prefixLength; i++)
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| { |
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| char ch = prefix.charAt(i);
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| if (ch < '!' | ch > 'z')
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| throw new IllegalArgumentException(Tapestry
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| .getMessage("DataSqueezer.prefix-out-of-range")); |
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| offset = ch - FIRST_ADAPTOR_OFFSET;
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| if (_adaptorByPrefix[offset] != null)
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| throw new IllegalArgumentException(Tapestry.format(
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| "DataSqueezer.adaptor-prefix-taken", |
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| prefix.substring(i, i))); |
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| _adaptorByPrefix[offset] = adaptor;
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| } |
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| _adaptors.register(dataClass, adaptor);
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| } |
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| public String squeeze(Object data)
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| { |
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| SqueezeAdaptor adaptor;
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| if (data == null)
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| return NULL_PREFIX;
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| adaptor = (SqueezeAdaptor) _adaptors.getStrategy(data.getClass());
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| return adaptor.squeeze(this, data);
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| } |
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| public String[] squeeze(Object[] data)
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| { |
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| if (data == null)
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| return null;
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| int length = data.length;
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| String[] result;
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| result = new String[length];
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| for (int i = 0; i < length; i++)
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| result[i] = squeeze(data[i]);
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| return result;
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| } |
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| public Object unsqueeze(String string)
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| { |
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| SqueezeAdaptor adaptor = null;
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| if (string.equals(NULL_PREFIX))
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| return null;
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| int offset = string.charAt(0) - FIRST_ADAPTOR_OFFSET;
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| if (offset >= 0 && offset < _adaptorByPrefix.length)
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| adaptor = _adaptorByPrefix[offset];
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| if (adaptor == null)
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| return string;
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| return adaptor.unsqueeze(this, string);
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| } |
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| public Object[] unsqueeze(String[] strings)
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| { |
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| if (strings == null)
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| return null;
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| int length = strings.length;
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| Object[] result;
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| result = new Object[length];
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| for (int i = 0; i < length; i++)
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| result[i] = unsqueeze(strings[i]);
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| return result;
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| } |
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| public String toString()
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| { |
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| StringBuffer buffer;
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| buffer = new StringBuffer();
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| buffer.append("DataSqueezer[adaptors=<");
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| buffer.append(_adaptors.toString());
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| buffer.append(">]");
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| return buffer.toString();
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| } |
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| } |