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| package org.apache.tapestry.record; |
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| import java.util.ArrayList; |
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| import java.util.HashMap; |
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| import java.util.Iterator; |
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| import java.util.List; |
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| import java.util.Map; |
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| import org.apache.hivemind.util.Defense; |
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| public class PersistentPropertyData |
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| { |
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| private Map _changes; |
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| private String _encoded; |
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| private final PersistentPropertyDataEncoder _encoder; |
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| public PersistentPropertyData(PersistentPropertyDataEncoder encoder)
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| { |
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| Defense.notNull(encoder, "encoder");
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| _encoder = encoder;
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| _changes = new HashMap();
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| } |
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| public String getEncoded()
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| { |
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| if (_encoded == null)
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| _encoded = encode();
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| return _encoded;
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| } |
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| public List getPageChanges()
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| { |
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| if (_changes == null)
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| { |
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| List pageChanges = _encoder.decodePageChanges(_encoded);
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| _changes = decode(pageChanges);
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| return pageChanges;
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| } |
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| return createPageChangeList();
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| } |
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| public void store(String componentPath, String propertyName, Object newValue)
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| { |
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| Defense.notNull(propertyName, "propertyName");
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| if (_changes == null)
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| _changes = decode(_encoder.decodePageChanges(_encoded));
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| ChangeKey key = new ChangeKey(componentPath, propertyName);
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| _changes.put(key, newValue);
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| _encoded = null;
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| } |
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| public void storeEncoded(String encoded)
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| { |
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| Defense.notNull(encoded, "encoded");
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| _encoded = encoded;
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| _changes = null;
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| } |
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| private List createPageChangeList()
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| { |
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| List result = new ArrayList();
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| Iterator i = _changes.entrySet().iterator();
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| while (i.hasNext())
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| { |
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| Map.Entry me = (Map.Entry) i.next();
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| ChangeKey changeKey = (ChangeKey) me.getKey();
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| Object value = me.getValue();
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| PropertyChange change = new PropertyChangeImpl(changeKey.getComponentPath(), changeKey
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| .getPropertyName(), value); |
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| result.add(change);
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| } |
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| return result;
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| } |
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| private String encode()
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| { |
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| List changes = createPageChangeList();
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| return _encoder.encodePageChanges(changes);
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| } |
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| private Map decode(List pageChanges)
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| { |
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| Map result = new HashMap();
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| Iterator i = pageChanges.iterator();
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| while (i.hasNext())
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| { |
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| PropertyChange pc = (PropertyChange) i.next();
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| String propertyName = pc.getPropertyName();
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| String componentPath = pc.getComponentPath();
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| ChangeKey key = new ChangeKey(componentPath, propertyName);
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| result.put(key, pc.getNewValue());
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| } |
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| return result;
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| } |
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| } |