2.4/dev/core/src/com/google/gwt/dev/shell/ModuleSpacePropertyOracle.java - gwt - Git at Google

 /*
  * Copyright 2008 Google Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
  * use this file except in compliance with the License. You may obtain a copy of
  * the License at
  *
  * http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  * License for the specific language governing permissions and limitations under
  * the License.
  */
 package com.google.gwt.dev.shell;

 import com.google.gwt.core.ext.BadPropertyValueException;
 import com.google.gwt.core.ext.DefaultConfigurationProperty;
 import com.google.gwt.core.ext.DefaultSelectionProperty;
 import com.google.gwt.core.ext.PropertyOracle;
 import com.google.gwt.core.ext.SelectionProperty;
 import com.google.gwt.core.ext.TreeLogger;
 import com.google.gwt.core.ext.UnableToCompleteException;
 import com.google.gwt.dev.cfg.BindingProperty;
 import com.google.gwt.dev.cfg.Condition;
 import com.google.gwt.dev.cfg.ConfigurationProperty;
 import com.google.gwt.dev.cfg.DeferredBindingQuery;
 import com.google.gwt.dev.cfg.Properties;
 import com.google.gwt.dev.cfg.Property;

 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
 import java.util.SortedSet;
 import java.util.TreeSet;

 /**
  * Implements a {@link PropertyOracle} in terms of a module space, which makes
  * it possible to execute property providers.
  */
 public class ModuleSpacePropertyOracle implements PropertyOracle {

   private final Set<String> activeLinkerNames;

   private final Map<String, String> prevAnswers = new HashMap<String, String>();

   private final Properties props;

   private final ModuleSpace space;

   /**
    * Create a property oracle that computes its properties from a module.
    */
   public ModuleSpacePropertyOracle(Properties props,
       Set<String> activeLinkerNames, ModuleSpace space) {
     this.space = space;
     this.activeLinkerNames = activeLinkerNames;
     this.props = props;
   }

   public com.google.gwt.core.ext.ConfigurationProperty getConfigurationProperty(
       String propertyName) throws BadPropertyValueException {
     Property prop = getProperty(propertyName);
     if (prop instanceof ConfigurationProperty) {
       final ConfigurationProperty cprop = (ConfigurationProperty) prop;
       final String name = cprop.getName();
       final List<String> values = cprop.getValues();
       return new DefaultConfigurationProperty(name, values);
     } else {
       throw new BadPropertyValueException(propertyName);
     }
   }

   /**
    * Executes JavaScript to find the property value.
    */
   @Deprecated
   public String getPropertyValue(TreeLogger logger, String propertyName)
       throws BadPropertyValueException {
     Property prop = getProperty(propertyName);

     // Check if this property has already been queried for; if so, return
     // the same answer. This is necessary to match Production Mode behavior
     // since property providers are only called once. We cache even values that
     // cause exceptions to be thrown to make sure we are consistent even
     // in throwing exceptions for the same property.
     if (prevAnswers.containsKey(propertyName)) {
       return prevAnswers.get(propertyName);
     } else {
       String value;
       if (prop instanceof ConfigurationProperty) {
         value = ((ConfigurationProperty) prop).getValue();
       } else if (prop instanceof BindingProperty) {
         value = computePropertyValue(logger, propertyName,
             (BindingProperty) prop);
       } else {
         throw new BadPropertyValueException(propertyName);
       }
       prevAnswers.put(propertyName, value);
       return value;
     }
   }

   /**
    * Returns the list of possible values for a property.
    */
   @Deprecated
   public String[] getPropertyValueSet(TreeLogger logger, String propertyName)
       throws BadPropertyValueException {
     Property prop = getProperty(propertyName);
     if (prop instanceof BindingProperty) {
       return ((BindingProperty) prop).getDefinedValues();
     }
     throw new BadPropertyValueException(propertyName);
   }

   public SelectionProperty getSelectionProperty(TreeLogger logger,
       String propertyName) throws BadPropertyValueException {
     Property prop = getProperty(propertyName);
     if (prop instanceof BindingProperty) {
       final BindingProperty cprop = (BindingProperty) prop;
       final String name = cprop.getName();
       final String value;
       if (prevAnswers.containsKey(propertyName)) {
         value = prevAnswers.get(propertyName);
       } else {
         value = computePropertyValue(logger, propertyName, cprop);
         prevAnswers.put(propertyName, value);
       }
       final String fallback = cprop.getFallback();
       final SortedSet<String> possibleValues = new TreeSet<String>();
       for (String v : cprop.getDefinedValues()) {
         possibleValues.add(v);
       }
       return new DefaultSelectionProperty(value, fallback, name, possibleValues,
           cprop.getFallbackValuesMap());
     } else {
       throw new BadPropertyValueException(propertyName);
     }
   }

   private Condition computeActiveCondition(TreeLogger logger,
       BindingProperty prop) throws BadPropertyValueException {
     // Last-one-wins
     Condition winner = null;
     for (Condition cond : prop.getConditionalValues().keySet()) {
       try {
         if (cond.isTrue(logger, new DeferredBindingQuery(this,
             activeLinkerNames))) {
           winner = cond;
         }
       } catch (UnableToCompleteException e) {
         BadPropertyValueException t = new BadPropertyValueException(
             prop.getName());
         t.initCause(e);
         throw t;
       }
     }
     assert winner != null : "No active Condition for " + prop.getName();
     return winner;
   }

   /**
    * Returns the value of the specified property.
    *
    * @throws BadPropertyValueException if the property value could not be
    *           computed, or if the returned result is not a legal value for this
    *           property.
    */
   private String computePropertyValue(TreeLogger logger, String propertyName,
       BindingProperty prop) throws BadPropertyValueException {

     String value = prop.getConstrainedValue();
     if (value != null) {
       // If there is only one legal value, use that.
       return value;
     }

     Condition winner = computeActiveCondition(logger, prop);
     String[] values = prop.getAllowedValues(winner);
     if (values.length == 1) {
       return values[0];
     }

     // Invokes the script function.
     //
     try {
       // Invoke the property provider function in JavaScript.
       //
       value = (String) space.invokeNativeObject("__gwt_getProperty", null,
           new Class[] {String.class}, new Object[] {prop.getName()});
     } catch (Throwable e) {
       // Treat as an unknown value.
       //
       String msg = "Error while executing the JavaScript provider for property '"
           + propertyName + "'";
       logger.log(TreeLogger.ERROR, msg, e);
       throw new BadPropertyValueException(propertyName, "<failed to compute>");
     }

     // value may be null if the provider returned an unknown property value.
     if (Arrays.asList(values).contains(value)) {
       return value;
     } else {
       // Bad value due to the provider returning an unknown value.
       // The fact that the provider returned an invalid value will also
       // have been reported to the JS bad property value handler function.
       throw new BadPropertyValueException(propertyName, value);
     }
   }

   /**
    * Returns a Property given its name, handling error conditions.
    *
    * @throws BadPropertyValueException
    */
   private Property getProperty(String propertyName)
       throws BadPropertyValueException {
     if (propertyName == null) {
       throw new NullPointerException("propertyName");
     }

     Property prop = props.find(propertyName);
     if (prop == null) {
       // Don't know this property; that's not good.
       //
       throw new BadPropertyValueException(propertyName);
     }
     return prop;
   }
 }
	/*
	* Copyright 2008 Google Inc.
	*
	* Licensed under the Apache License, Version 2.0 (the "License"); you may not
	* use this file except in compliance with the License. You may obtain a copy of
	* the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
	* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
	* License for the specific language governing permissions and limitations under
	* the License.
	*/
	package com.google.gwt.dev.shell;

	import com.google.gwt.core.ext.BadPropertyValueException;
	import com.google.gwt.core.ext.DefaultConfigurationProperty;
	import com.google.gwt.core.ext.DefaultSelectionProperty;
	import com.google.gwt.core.ext.PropertyOracle;
	import com.google.gwt.core.ext.SelectionProperty;
	import com.google.gwt.core.ext.TreeLogger;
	import com.google.gwt.core.ext.UnableToCompleteException;
	import com.google.gwt.dev.cfg.BindingProperty;
	import com.google.gwt.dev.cfg.Condition;
	import com.google.gwt.dev.cfg.ConfigurationProperty;
	import com.google.gwt.dev.cfg.DeferredBindingQuery;
	import com.google.gwt.dev.cfg.Properties;
	import com.google.gwt.dev.cfg.Property;

	import java.util.Arrays;
	import java.util.HashMap;
	import java.util.List;
	import java.util.Map;
	import java.util.Set;
	import java.util.SortedSet;
	import java.util.TreeSet;

	/**
	* Implements a {@link PropertyOracle} in terms of a module space, which makes
	* it possible to execute property providers.
	*/
	public class ModuleSpacePropertyOracle implements PropertyOracle {

	private final Set<String> activeLinkerNames;

	private final Map<String, String> prevAnswers = new HashMap<String, String>();

	private final Properties props;

	private final ModuleSpace space;

	/**
	* Create a property oracle that computes its properties from a module.
	*/
	public ModuleSpacePropertyOracle(Properties props,
	Set<String> activeLinkerNames, ModuleSpace space) {
	this.space = space;
	this.activeLinkerNames = activeLinkerNames;
	this.props = props;
	}

	public com.google.gwt.core.ext.ConfigurationProperty getConfigurationProperty(
	String propertyName) throws BadPropertyValueException {
	Property prop = getProperty(propertyName);
	if (prop instanceof ConfigurationProperty) {
	final ConfigurationProperty cprop = (ConfigurationProperty) prop;
	final String name = cprop.getName();
	final List<String> values = cprop.getValues();
	return new DefaultConfigurationProperty(name, values);
	} else {
	throw new BadPropertyValueException(propertyName);
	}
	}

	/**
	* Executes JavaScript to find the property value.
	*/
	@Deprecated
	public String getPropertyValue(TreeLogger logger, String propertyName)
	throws BadPropertyValueException {
	Property prop = getProperty(propertyName);

	// Check if this property has already been queried for; if so, return
	// the same answer. This is necessary to match Production Mode behavior
	// since property providers are only called once. We cache even values that
	// cause exceptions to be thrown to make sure we are consistent even
	// in throwing exceptions for the same property.
	if (prevAnswers.containsKey(propertyName)) {
	return prevAnswers.get(propertyName);
	} else {
	String value;
	if (prop instanceof ConfigurationProperty) {
	value = ((ConfigurationProperty) prop).getValue();
	} else if (prop instanceof BindingProperty) {
	value = computePropertyValue(logger, propertyName,
	(BindingProperty) prop);
	} else {
	throw new BadPropertyValueException(propertyName);
	}
	prevAnswers.put(propertyName, value);
	return value;
	}
	}

	/**
	* Returns the list of possible values for a property.
	*/
	@Deprecated
	public String[] getPropertyValueSet(TreeLogger logger, String propertyName)
	throws BadPropertyValueException {
	Property prop = getProperty(propertyName);
	if (prop instanceof BindingProperty) {
	return ((BindingProperty) prop).getDefinedValues();
	}
	throw new BadPropertyValueException(propertyName);
	}

	public SelectionProperty getSelectionProperty(TreeLogger logger,
	String propertyName) throws BadPropertyValueException {
	Property prop = getProperty(propertyName);
	if (prop instanceof BindingProperty) {
	final BindingProperty cprop = (BindingProperty) prop;
	final String name = cprop.getName();
	final String value;
	if (prevAnswers.containsKey(propertyName)) {
	value = prevAnswers.get(propertyName);
	} else {
	value = computePropertyValue(logger, propertyName, cprop);
	prevAnswers.put(propertyName, value);
	}
	final String fallback = cprop.getFallback();
	final SortedSet<String> possibleValues = new TreeSet<String>();
	for (String v : cprop.getDefinedValues()) {
	possibleValues.add(v);
	}
	return new DefaultSelectionProperty(value, fallback, name, possibleValues,
	cprop.getFallbackValuesMap());
	} else {
	throw new BadPropertyValueException(propertyName);
	}
	}

	private Condition computeActiveCondition(TreeLogger logger,
	BindingProperty prop) throws BadPropertyValueException {
	// Last-one-wins
	Condition winner = null;
	for (Condition cond : prop.getConditionalValues().keySet()) {
	try {
	if (cond.isTrue(logger, new DeferredBindingQuery(this,
	activeLinkerNames))) {
	winner = cond;
	}
	} catch (UnableToCompleteException e) {
	BadPropertyValueException t = new BadPropertyValueException(
	prop.getName());
	t.initCause(e);
	throw t;
	}
	}
	assert winner != null : "No active Condition for " + prop.getName();
	return winner;
	}

	/**
	* Returns the value of the specified property.
	*
	* @throws BadPropertyValueException if the property value could not be
	* computed, or if the returned result is not a legal value for this
	* property.
	*/
	private String computePropertyValue(TreeLogger logger, String propertyName,
	BindingProperty prop) throws BadPropertyValueException {

	String value = prop.getConstrainedValue();
	if (value != null) {
	// If there is only one legal value, use that.
	return value;
	}

	Condition winner = computeActiveCondition(logger, prop);
	String[] values = prop.getAllowedValues(winner);
	if (values.length == 1) {
	return values[0];
	}

	// Invokes the script function.
	//
	try {
	// Invoke the property provider function in JavaScript.
	//
	value = (String) space.invokeNativeObject("__gwt_getProperty", null,
	new Class[] {String.class}, new Object[] {prop.getName()});
	} catch (Throwable e) {
	// Treat as an unknown value.
	//
	String msg = "Error while executing the JavaScript provider for property '"
	+ propertyName + "'";
	logger.log(TreeLogger.ERROR, msg, e);
	throw new BadPropertyValueException(propertyName, "<failed to compute>");
	}

	// value may be null if the provider returned an unknown property value.
	if (Arrays.asList(values).contains(value)) {
	return value;
	} else {
	// Bad value due to the provider returning an unknown value.
	// The fact that the provider returned an invalid value will also
	// have been reported to the JS bad property value handler function.
	throw new BadPropertyValueException(propertyName, value);
	}
	}

	/**
	* Returns a Property given its name, handling error conditions.
	*
	* @throws BadPropertyValueException
	*/
	private Property getProperty(String propertyName)
	throws BadPropertyValueException {
	if (propertyName == null) {
	throw new NullPointerException("propertyName");
	}

	Property prop = props.find(propertyName);
	if (prop == null) {
	// Don't know this property; that's not good.
	//
	throw new BadPropertyValueException(propertyName);
	}
	return prop;
	}
	}