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package org.apache.tapestry.util.io; |
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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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import java.util.Iterator; |
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import java.util.List; |
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public class DataSqueezerImpl implements DataSqueezer |
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{ |
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protected static final String NULL_PREFIX = "X"; |
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protected static final int ARRAY_SIZE = 90; |
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protected static final int FIRST_ADAPTOR_OFFSET = 33; |
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protected SqueezeAdaptor[] _adaptorByPrefix = new SqueezeAdaptor[ARRAY_SIZE]; |
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protected 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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else if (string.length() <= 0) |
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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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} |