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| package org.apache.tapestry.link; |
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| |
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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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| |
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| import org.apache.tapestry.AbstractComponent; |
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| import org.apache.tapestry.IMarkupWriter; |
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| import org.apache.tapestry.IRequestCycle; |
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| import org.apache.tapestry.PageRenderSupport; |
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| import org.apache.tapestry.TapestryUtils; |
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| import org.apache.tapestry.components.ILinkComponent; |
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| import org.apache.tapestry.components.LinkEventType; |
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| import org.apache.tapestry.engine.IEngineService; |
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| import org.apache.tapestry.engine.ILink; |
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| public abstract class AbstractLinkComponent extends AbstractComponent implements ILinkComponent |
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| { |
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| private Map _eventHandlers; |
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| public abstract boolean isDisabled(); |
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| public void addEventHandler(LinkEventType eventType, String functionName)
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| { |
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| Object currentValue;
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| if (_eventHandlers == null)
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| _eventHandlers = new HashMap();
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| currentValue = _eventHandlers.get(eventType);
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| if (currentValue == null)
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| { |
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| _eventHandlers.put(eventType, functionName);
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| return;
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| } |
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| if (currentValue instanceof String)
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| { |
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| List list = new ArrayList();
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| list.add(currentValue);
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| list.add(functionName);
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| _eventHandlers.put(eventType, list);
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| return;
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| } |
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| List list = (List) currentValue;
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| list.add(functionName);
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| } |
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| protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle)
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| { |
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| getRenderer().renderLink(writer, cycle, this);
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| } |
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| protected void cleanupAfterRender(IRequestCycle cycle)
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| { |
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| _eventHandlers = null;
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| super.cleanupAfterRender(cycle);
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| } |
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| protected void writeEventHandlers(IMarkupWriter writer, IRequestCycle cycle)
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| { |
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| String name = null;
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| if (_eventHandlers == null)
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| return;
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| |
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| PageRenderSupport pageRenderSupport = TapestryUtils.getPageRenderSupport(cycle, this);
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| Iterator i = _eventHandlers.entrySet().iterator();
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| while (i.hasNext())
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| { |
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| Map.Entry entry = (Map.Entry) i.next();
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| LinkEventType type = (LinkEventType) entry.getKey();
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| |
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| name = writeEventHandler(
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| writer, |
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| pageRenderSupport, |
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| name, |
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| type.getAttributeName(), |
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| entry.getValue()); |
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| } |
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| } |
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| protected String writeEventHandler(IMarkupWriter writer, PageRenderSupport pageRenderSupport,
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| String name, String attributeName, Object value) |
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| { |
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| String wrapperFunctionName;
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| if (value instanceof String)
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| { |
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| wrapperFunctionName = (String) value;
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| } |
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| else |
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| { |
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| String finalName = name == null ? pageRenderSupport.getUniqueString("Link") : name;
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| wrapperFunctionName = attributeName + "_" + finalName;
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| StringBuffer buffer = new StringBuffer();
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| buffer.append("function ");
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| buffer.append(wrapperFunctionName);
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| buffer.append(" ()\n{\n");
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| Iterator i = ((List) value).iterator();
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| while (i.hasNext())
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| { |
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| String functionName = (String) i.next();
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| buffer.append(" ");
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| buffer.append(functionName);
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| buffer.append("();\n");
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| } |
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| buffer.append("}\n\n");
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| pageRenderSupport.addBodyScript(buffer.toString());
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| } |
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| writer.attribute(attributeName, "javascript:" + wrapperFunctionName + "();");
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| return name;
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| } |
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| public abstract ILinkRenderer getRenderer(); |
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| public abstract void setRenderer(ILinkRenderer renderer); |
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| public void renderAdditionalAttributes(IMarkupWriter writer, IRequestCycle cycle)
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| { |
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| writeEventHandlers(writer, cycle);
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| renderInformalParameters(writer, cycle);
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| } |
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| protected ILink getLink(IRequestCycle cycle, String serviceName, Object parameter)
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| { |
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| IEngineService service = cycle.getEngine().getService(serviceName);
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| return service.getLink(false, parameter);
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| } |
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| public abstract String getAnchor(); |
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| public ILink getLink(IRequestCycle cycle)
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| { |
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| return null;
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| } |
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| protected void finishLoad()
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| { |
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| setRenderer(DefaultLinkRenderer.SHARED_INSTANCE);
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| } |
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| } |