/**
* Licensed under the Common Development and Distribution License,
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.sun.com/cddl/
*
* 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.sun.facelets.tag;
import javax.el.ELException;
import javax.el.ExpressionFactory;
import javax.el.MethodExpression;
import javax.el.ValueExpression;
import com.sun.facelets.FaceletContext;
import com.sun.facelets.el.ELText;
import com.sun.facelets.el.TagMethodExpression;
import com.sun.facelets.el.TagValueExpression;
/**
* Representation of a Tag's attribute in a Facelet File
*
* @author Jacob Hookom
* @version $Id: TagAttribute.java,v 1.7 2005/11/09 03:49:18 jhook Exp $
*/
public final class TagAttribute {
private final boolean literal;
private final String localName;
private final Location location;
private final String namespace;
private final String qName;
private final String value;
private String string;
public TagAttribute(Location location, String ns, String localName,
String qName, String value) {
this.location = location;
this.namespace = ns;
this.localName = localName;
this.qName = qName;
this.value = value;
try {
this.literal = ELText.isLiteral(this.value);
} catch (ELException e) {
throw new TagAttributeException(this, e);
}
}
/**
* If literal, return
* {@link Boolean#getBoolean(java.lang.String) Boolean.getBoolean(java.lang.String)}
* passing our value, otherwise call
* {@link #getObject(FaceletContext, Class) getObject(FaceletContext, Class)}.
*
* @see Boolean#getBoolean(java.lang.String)
* @see #getObject(FaceletContext, Class)
* @param ctx
* FaceletContext to use
* @return boolean value
*/
public boolean getBoolean(FaceletContext ctx) {
if (this.literal) {
return Boolean.valueOf(this.value).booleanValue();
} else {
return ((Boolean) this.getObject(ctx, Boolean.class))
.booleanValue();
}
}
/**
* If literal, call
* {@link Integer#parseInt(java.lang.String) Integer.parseInt(String)},
* otherwise call
* {@link #getObject(FaceletContext, Class) getObject(FaceletContext, Class)}.
*
* @see Integer#parseInt(java.lang.String)
* @see #getObject(FaceletContext, Class)
* @param ctx
* FaceletContext to use
* @return int value
*/
public int getInt(FaceletContext ctx) {
if (this.literal) {
return Integer.parseInt(this.value);
} else {
return ((Number) this.getObject(ctx, Number.class)).intValue();
}
}
/**
* Local name of this attribute
*
* @return local name of this attribute
*/
public String getLocalName() {
return this.localName;
}
/**
* The location of this attribute in the FaceletContext
*
* @return the TagAttribute's location
*/
public Location getLocation() {
return this.location;
}
/**
* Create a MethodExpression, using this attribute's value as the expression
* String.
*
* @see ExpressionFactory#createMethodExpression(javax.el.ELContext,
* java.lang.String, java.lang.Class, java.lang.Class[])
* @see MethodExpression
* @param ctx
* FaceletContext to use
* @param type
* expected return type
* @param paramTypes
* parameter type
* @return a MethodExpression instance
*/
public MethodExpression getMethodExpression(FaceletContext ctx, Class type,
Class[] paramTypes) {
try {
ExpressionFactory f = ctx.getExpressionFactory();
return new TagMethodExpression(this, f.createMethodExpression(ctx,
this.value, type, paramTypes));
} catch (Exception e) {
throw new TagAttributeException(this, e);
}
}
/**
* The resolved Namespace for this attribute
*
* @return resolved Namespace
*/
public String getNamespace() {
return this.namespace;
}
/**
* Delegates to getObject with Object.class as a param
*
* @see #getObject(FaceletContext, Class)
* @param ctx
* FaceletContext to use
* @return Object representation of this attribute's value
*/
public Object getObject(FaceletContext ctx) {
return this.getObject(ctx, Object.class);
}
/**
* The qualified name for this attribute
*
* @return the qualified name for this attribute
*/
public String getQName() {
return this.qName;
}
/**
* Return the literal value of this attribute
*
* @return literal value
*/
public String getValue() {
return this.value;
}
/**
* If literal, then return our value, otherwise delegate to getObject,
* passing String.class.
*
* @see #getObject(FaceletContext, Class)
* @param ctx
* FaceletContext to use
* @return String value of this attribute
*/
public String getValue(FaceletContext ctx) {
if (this.literal) {
return this.value;
} else {
return (String) this.getObject(ctx, String.class);
}
}
/**
* If literal, simply coerce our String literal value using an
* ExpressionFactory, otherwise create a ValueExpression and evaluate it.
*
* @see ExpressionFactory#coerceToType(java.lang.Object, java.lang.Class)
* @see ExpressionFactory#createValueExpression(javax.el.ELContext,
* java.lang.String, java.lang.Class)
* @see ValueExpression
* @param ctx
* FaceletContext to use
* @param type
* expected return type
* @return Object value of this attribute
*/
public Object getObject(FaceletContext ctx, Class type) {
if (this.literal) {
if (String.class.equals(type)) {
return this.value;
} else {
try {
return ctx.getExpressionFactory().coerceToType(this.value,
type);
} catch (Exception e) {
throw new TagAttributeException(this, e);
}
}
} else {
ValueExpression ve = this.getValueExpression(ctx, type);
try {
return ve.getValue(ctx);
} catch (Exception e) {
throw new TagAttributeException(this, e);
}
}
}
/**
* Create a ValueExpression, using this attribute's literal value and the
* passed expected type.
*
* @see ExpressionFactory#createValueExpression(javax.el.ELContext,
* java.lang.String, java.lang.Class)
* @see ValueExpression
* @param ctx
* FaceletContext to use
* @param type
* expected return type
* @return ValueExpression instance
*/
public ValueExpression getValueExpression(FaceletContext ctx, Class type) {
try {
ExpressionFactory f = ctx.getExpressionFactory();
return new TagValueExpression(this, f.createValueExpression(ctx,
this.value, type));
} catch (Exception e) {
throw new TagAttributeException(this, e);
}
}
/**
* If this TagAttribute is literal (not #{..} or ${..})
*
* @return true if this attribute is literal
*/
public boolean isLiteral() {
return this.literal;
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#toString()
*/
public String toString() {
if (this.string == null) {
this.string = this.location + " " + this.qName + "=\"" + this.value
+ "\"";
}
return this.string;
}
}