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package com.sun.faces.facelets.tag;
import com.sun.faces.facelets.el.ELText;
import com.sun.faces.facelets.el.TagMethodExpression;
import com.sun.faces.facelets.el.TagValueExpression;
import com.sun.faces.util.Util;
import javax.el.*;
import javax.faces.FacesException;
import javax.faces.component.StateHolder;
import javax.faces.context.FacesContext;
import javax.faces.view.Location;
import javax.faces.view.facelets.FaceletContext;
import javax.faces.view.facelets.TagAttribute;
import javax.faces.view.facelets.TagAttributeException;
/**
* Representation of a Tag's attribute in a Facelet File
*
* @author Jacob Hookom
* @version $Id: TagAttributeImpl.java 7265 2009-05-01 19:46:08Z rlubke $
*/
public final class TagAttributeImpl extends 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 TagAttributeImpl(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
*/
@Override
public boolean getBoolean(FaceletContext ctx) {
if (this.literal) {
return Boolean.valueOf(this.value);
} else {
return ((Boolean) this.getObject(ctx, Boolean.class));
}
}
/**
* 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
*/
@Override
public int getInt(FaceletContext ctx) {
if (this.literal) {
return Integer.parseInt(this.value);
} else {
return ((Number) this.getObject(ctx, Integer.class)).intValue();
}
}
/**
* Local name of this attribute
*
* @return local name of this attribute
*/
@Override
public String getLocalName() {
return this.localName;
}
/**
* The location of this attribute in the FaceletContext
*
* @return the TagAttributeImpl's location
*/
@Override
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
*/
@Override
public MethodExpression getMethodExpression(FaceletContext ctx, Class type,
Class[] paramTypes) {
MethodExpression result = null;
try {
ExpressionFactory f = ctx.getExpressionFactory();
// Determine if this is a composite component attribute lookup.
// If so, look for a MethodExpression under the attribute key
CompositeComponentExpressionHelper helper =
new CompositeComponentExpressionHelper(this.value);
if (helper.isValidCCExpression() && helper.isLookup()) {
result = new AttributeLookupMethodExpression(getValueExpression(ctx, MethodExpression.class));
}
if (null == result) {
result = new TagMethodExpression(this, f.createMethodExpression(ctx,
this.value, type, paramTypes));
}
} catch (Exception e) {
throw new TagAttributeException(this, e);
}
return result;
}
public static class AttributeLookupMethodExpression extends MethodExpression implements StateHolder {
private ValueExpression lookupExpression;
private boolean isTransient = false;
public AttributeLookupMethodExpression(ValueExpression lookupExpression) {
Util.notNull("lookupExpression", lookupExpression);
this.lookupExpression = lookupExpression;
}
public AttributeLookupMethodExpression() {}
public boolean isTransient() {
return isTransient;
}
public void setTransient(boolean isTransient) {
this.isTransient = isTransient;
}
public void restoreState(FacesContext context, Object stateObj) {
Object[] state = (Object[]) stateObj;
lookupExpression = (ValueExpression) state[0];
}
public Object saveState(FacesContext arg0) {
Object[] state = new Object[1];
state[0] = lookupExpression;
return state;
}
@Override
public MethodInfo getMethodInfo(ELContext arg0) {
return null;
}
@Override
public Object invoke(ELContext elContext, Object[] arg1) {
Object result = lookupExpression.getValue(elContext);
if (result == null) {
throw new FacesException("Unable to resolve composite component from using page using EL expression '" + lookupExpression.getExpressionString() + '\'');
}
if (!(result instanceof MethodExpression)) {
throw new FacesException("Successfully resolved expression '" + lookupExpression.getExpressionString() + "', but the value is not a MethodExpression");
}
return ((MethodExpression) result).invoke(elContext, arg1);
}
@Override
public String getExpressionString() {
return lookupExpression.getExpressionString();
}
@Override
public boolean equals(Object otherObj) {
boolean result = false;
if (otherObj instanceof AttributeLookupMethodExpression) {
AttributeLookupMethodExpression other =
(AttributeLookupMethodExpression) otherObj;
result = lookupExpression.getExpressionString().equals(other.lookupExpression.getExpressionString());
}
return result;
}
@Override
public boolean isLiteralText() {
return lookupExpression.isLiteralText();
}
@Override
public int hashCode() {
return lookupExpression.hashCode();
}
}
/**
* The resolved Namespace for this attribute
*
* @return resolved Namespace
*/
@Override
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
*/
@Override
public Object getObject(FaceletContext ctx) {
return this.getObject(ctx, Object.class);
}
/**
* The qualified name for this attribute
*
* @return the qualified name for this attribute
*/
@Override
public String getQName() {
return this.qName;
}
/**
* Return the literal value of this attribute
*
* @return literal value
*/
@Override
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
*/
@Override
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
*/
@Override
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
*/
@Override
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 TagAttributeImpl is literal (not #{..} or ${..})
*
* @return true if this attribute is literal
*/
@Override
public boolean isLiteral() {
return this.literal;
}
/*
* (non-Javadoc)
*
* @see java.lang.Object#toString()
*/
@Override
public String toString() {
if (this.string == null) {
this.string = this.location + " " + this.qName + "=\"" + this.value
+ "\"";
}
return this.string;
}
// ---------------------------------------------------------- Nested Classes
private static class CompositeComponentExpressionHelper {
private boolean valid;
private boolean lookup;
CompositeComponentExpressionHelper(String expression) {
if (expression.startsWith("#{cc.")) {
String[] parts = Util.split(expression, "\\.");
int len = parts.length;
if (len <= 2) {
valid = false;
} else {
valid = true;
if ("attrs".equals(parts[len - 2])) {
lookup = true;
}
}
}
}
boolean isValidCCExpression() {
return valid;
}
boolean isLookup() {
return lookup;
}
}
}