com.google.gwt.dev.util.xml.HandlerArgs Maven / Gradle / Ivy
/*
* Copyright 2006 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.util.xml;
import com.google.gwt.core.ext.UnableToCompleteException;
/**
* A set of args for a given set of parameters, some of which may be set to
* default values.
*/
public class HandlerArgs {
// The real (non-normalized) names of the attributes, used to report errors.
private final String[] attrNames;
private final String[] argValues;
private final HandlerParam[] handlerParams;
private final int lineNumber;
private final Schema schema;
private final String elemName;
public HandlerArgs(Schema schema, int lineNumber, String elemName,
HandlerParam[] handlerParams) {
this.schema = schema;
this.lineNumber = lineNumber;
this.elemName = elemName;
this.handlerParams = handlerParams;
attrNames = new String[handlerParams.length];
argValues = new String[handlerParams.length];
// Set default values.
//
for (int i = 0, n = handlerParams.length; i < n; ++i) {
argValues[i] = this.handlerParams[i].getDefaultValue(schema);
}
}
/**
* @return the argument converted to a form that is expected to compatible
* with the associated parameter and will work for a reflection
* "invoke()" call
*/
public Object convertToArg(int i) throws UnableToCompleteException {
String value = argValues[i];
if (value != null) {
AttributeConverter converter = schema.getAttributeConverter(handlerParams[i].getParamType());
return converter.convertToArg(schema, lineNumber, elemName, attrNames[i],
value);
} else if (handlerParams[i].isOptional()) {
return null;
} else {
return new NullPointerException("Argument " + i + " was null");
}
}
public int getArgCount() {
return handlerParams.length;
}
public String getArgName(int i) {
return handlerParams[i].getNormalizedName();
}
public boolean isArgSet(int i) {
if (argValues[i] != null || handlerParams[i].isOptional()) {
return true;
} else {
return false;
}
}
/**
* @return true if the param for the specified attribute was
* set; false if no matching param was found
*/
public boolean setArg(String attrName, String attrValue) {
String normalizedAttrName = normalizeAttrName(attrName);
for (int i = 0, n = handlerParams.length; i < n; ++i) {
Object testParamName = handlerParams[i].getNormalizedName();
if (testParamName.equals(normalizedAttrName)) {
// Set it, but don't convert it yet.
attrNames[i] = attrName;
argValues[i] = attrValue;
return true;
}
}
return false;
}
private String normalizeAttrName(String attrName) {
// NOTE: this is where other characters would be folded to '_'.
return attrName.replace('-', '_');
}
}